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2014/10/15 ¤U¤È 10:13:42
iphone Programming Glossary: seeHow to check for an active Internet Connection on iPhone SDK? http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk to check for an active Internet Connection on iPhone SDK I would like to check to see if I have an Internet connection on the iPhone using the Cocoa Touch libraries. I came up with a way.. using the Cocoa Touch libraries. I came up with a way to do this using an NSURL . The way I did it seems a bit unreliable because even Google could one day be down and relying on a 3rd party seems bad and.. did it seems a bit unreliable because even Google could one day be down and relying on a 3rd party seems bad and while I could check to see for a response from some other websites if Google didn't respond..
HTML character decoding in Objective-C / Cocoa Touch http://stackoverflow.com/questions/1105169/html-character-decoding-in-objective-c-cocoa-touch
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present up a keyboard. I need it to be able to Allow scrolling of the contents of the UIScrollView to see the other text fields once the keyboard is brought up Automatically jump by scrolling up or shortening..
How to add a breakpoint to objc_exception_throw? http://stackoverflow.com/questions/1163981/how-to-add-a-breakpoint-to-objc-exception-throw breakpoints enabled it should break on the throw of these exceptions. You should then be able to see the chain of events that led to the exception within the debugger. now in this answer i want to ask..
How to detect iPhone 5 (widescreen devices)? http://stackoverflow.com/questions/12446990/how-to-detect-iphone-5-widescreen-devices screen size will still be 320x480 in such a case. I don't think this may be an issue as I don't see why we would want to detect an iPhone 5 in a non optimized app. Final note Comments and suggestions..
Add UIPickerView & a Button in Action sheet - How? http://stackoverflow.com/questions/1262574/add-uipickerview-a-button-in-action-sheet-how
How do I associate file types with an iPhone application? http://stackoverflow.com/questions/2774343/how-do-i-associate-file-types-with-an-iphone-application of Uniform Type Identifiers UTIs that your application can open. For a list of system defined UTIs see Apple's Uniform Type Identifiers Reference . Even more detail on UTIs can be found in Apple's Uniform..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 the Simulator part isn't the same as the arm6 arm7 difference any more it's a different problem see above iphone xcode share improve this question ALTERNATIVES https gist.github.com 3705459 easy.. gist.github.com 3705459 easy copy paste of latest version but install instructions may change see below Karl's library http stackoverflow.com a 5721978 153422 takes much more effort to setup but much.. script to let you auto include Bundles i.e. include PNG files PLIST files etc from your library see below scroll to bottom now supports iPhone5 using Apple's workaround to the bugs in lipo . NOTE the..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints Theres a significant Overhead time drawing a full PDF page to a CALayer individual tiles can be seen rendering even with a tileSize tweak CALayers cant be prepared ahead of time rendered off screen ... the scale is 1. iBooks takes a similar double take approach as if you scroll the pages you can see a lower res version of the page for just less than a second before a crisp version appears. Im rendering.. paging UIScrollView CATiledView brow leaves paging with nice transitions skim everything it seems PDF reader editor for OSX iphone ios ipad pdf calayer share improve this question I have build..
How to link to apps on the app store http://stackoverflow.com/questions/433907/how-to-link-to-apps-on-the-app-store
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c delegates that use a formal protocol you must declare your delegate to implement that protocol see below. For example suppose you have an NSWindow. If you'd like to implement its delegate's windowDidMove.. init window setDelegate myDelegate On the NSWindow side it probably has code similar to this to see if the delegate responds to the windowDidMove message using respondsToSelector and send it if appropriate...
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c release it when you're done. Consider the following very contrived bit of code and you'll see a situation where autorelease is required NSString createHelloWorldString NSString s NSString alloc..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature is the best way to deal with the NSDateFormatter locale &ldquo feature&rdquo It seems that NSDateFormatter has a feature that bites you unexpectedly If you do a simple fixed format operation.. of the resulting string. See eg NSDateFormatter am I doing something wrong or is this a bug And see https developer.apple.com library ios qa qa1480 _index.html Apparently Apple has declared this to be.. two lines the alloc init line and the added import. Added This is what I've come up with so far seems to work in all scenarios @implementation BNSDateFormatter id init static NSLocale en_US_POSIX nil..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage this question Yes CGContexts have their y axis pointing up while in UIKit it points down. See the docs . Edit after reading code You also want to set the blend mode to replace before drawing the..
Assertion failure in dequeueReusableCellWithIdentifier:forIndexPath: http://stackoverflow.com/questions/12737860/assertion-failure-in-dequeuereusablecellwithidentifierforindexpath
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone include CommonCrypto although 10.5 has a man page for CCCryptor.3cc and 10.4 doesn't so YMMV. EDIT See this follow up question on using Base64 encoding for representing encrypted data bytes as a string if..
Using SSL in an iPhone App - Export Compliance http://stackoverflow.com/questions/2128927/using-ssl-in-an-iphone-app-export-compliance and you probably need an ERN now not a CCATS as was necessary at the time John wrote his answer. See Apple iTunes export restrictions on apps . The iTunes connect faq also contains a lot of useful information..
http://stackoverflow.com/questions/2496554/easiest-way-to-support-multiple-orientations-how-do-i-load-a-custom-nib-when-th the app to start in a particular orientation usually portrait and then immediately rotate. See mobile Safari. It always starts in portrait and then rotates to landscape. These are the two methods..
How To Make iPhone App compatible with multiple SDK (firmware) versions http://stackoverflow.com/questions/3027120/how-to-make-iphone-app-compatible-with-multiple-sdk-firmware-versions armv6 to the build architectures and remove armv7 from the plist of required device capabilities. See these SO questions and answers for more details deployment target vs base active sdk recommended way..
Install xCode 3.2.3 w/ iPhone SDK 4, get “Base SDK missing”, can't see other SDKs http://stackoverflow.com/questions/3161385/install-xcode-3-2-3-w-iphone-sdk-4-get-base-sdk-missing-cant-see-other-sdk you want to support. Note that support for 2.x versions through the app store is deprecated. See the Readiness Checklist quote above. Base SDK location for Xcode 4 and above Follow the steps above..
Detecting touch screen devices with Javascript http://stackoverflow.com/questions/3974827/detecting-touch-screen-devices-with-javascript for the mobile device style properties you could hook into them to write you mobile specific code. See here http www.forabeautifulweb.com blog about hardboiled_css3_media_queries share improve this answer..
Change User Agent in UIWebView (iPhone SDK) http://stackoverflow.com/questions/478387/change-user-agent-in-uiwebview-iphone-sdk @ Your user agent @ UserAgent nil NSUserDefaults standardUserDefaults registerDefaults dictionary See previous edits on this post if you need methods that work in versions of iOS before 4.3 5.0. Note that..
How do I set up a simple delegate to communicate between two view controllers? http://stackoverflow.com/questions/6168919/how-do-i-set-up-a-simple-delegate-to-communicate-between-two-view-controllers ChildViewController UIViewController Delegate properties should always be weak references See http stackoverflow.com a 4796131 263871 for the rationale Tip If you're not using ARC use `assign` instead..
iOS 5 Best Practice (Release/retain?) http://stackoverflow.com/questions/6308425/ios-5-best-practice-release-retain is compatible with ARC. Edit I recently discovered that you can turn off ARC on a per file basis. See pixelfreak 's answer . So my advice still stands but now the 3rd party libraries shouldn't need to be..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature in settings to 12. Then the above starts tacking AM or PM onto the end of the resulting string. See eg NSDateFormatter am I doing something wrong or is this a bug And see https developer.apple.com library.. Bounty I'll award the bounty to the best legitimate suggestion critique I see by mid day Tuesday. See below deadline extended. Update Re OMZ's proposal here is what I'm finding Here is the category version.. en_GB. It appears that there is something strange about an init method in a category. Final answer See the accepted answer below. iphone ios locale nsdateformatter share improve this question Instead..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown you'll just get a warning that it doesn't know which of two method signatures to choose from. 3 See the ARC reference on retained return values and unretained return values for more details. share improve..
GCD, Threads, Program Flow and UI Updating http://stackoverflow.com/questions/7290931/gcd-threads-program-flow-and-ui-updating to in the code above. Here's the code you had. Where you say wait in the comment is incorrect. See where I added NO. void solvePuzzle id sender solveButton.enabled NO solveButton.title @ Working . ...
How can we programmatically detect which iOS version is device running on? [duplicate] http://stackoverflow.com/questions/7848766/how-can-we-programmatically-detect-which-ios-version-is-device-running-on Best current version without need to deal with numeric search within NSString is to define macros See original answer Check iPhone iOS Version Those macros do exist in github see https github.com carlj..
iOS Launching Settings -> Restrictions URL Scheme http://stackoverflow.com/questions/8246070/ios-launching-settings-restrictions-url-scheme improve this question WARNING This method will not work for devices running iOS 5.1 and greater See Hlung's comment below. It's possible that the path component has a different name than the actual section..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud equal numbers of people saying the performance is good especially when rendering UITableView s. See this SO question for example or this article on iPhoneDeveloperTips.com UIImage 's imageNamed method..
How to check for an active Internet Connection on iPhone SDK? http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk to check for an active Internet Connection on iPhone SDK I would like to check to see if I have an Internet connection on the iPhone using the Cocoa Touch libraries. I came up with a way to do this using an NSURL . The way I did it seems a bit unreliable.. check to see if I have an Internet connection on the iPhone using the Cocoa Touch libraries. I came up with a way to do this using an NSURL . The way I did it seems a bit unreliable because even Google could one day be down and relying on a 3rd party seems bad and while I could check to see for a response from some other.. I came up with a way to do this using an NSURL . The way I did it seems a bit unreliable because even Google could one day be down and relying on a 3rd party seems bad and while I could check to see for a response from some other websites if Google didn't respond it does seem wasteful and an unnecessary overhead on my application...
HTML character decoding in Objective-C / Cocoa Touch http://stackoverflow.com/questions/1105169/html-character-decoding-in-objective-c-cocoa-touch
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present the iPhone SDK I have a UIView with UITextFields that brings up a keyboard. I need it to be able to Allow scrolling of the contents of the UIScrollView to see the other text fields once the keyboard is brought up Automatically jump by scrolling up or shortening I know that I need a UIScrollView . I've tried changing the..
How to add a breakpoint to objc_exception_throw? http://stackoverflow.com/questions/1163981/how-to-add-a-breakpoint-to-objc-exception-throw . Now if you start debugging your application with breakpoints enabled it should break on the throw of these exceptions. You should then be able to see the chain of events that led to the exception within the debugger. now in this answer i want to ask how do i add location mentioned objective c iphone xcode debugging..
How to detect iPhone 5 (widescreen devices)? http://stackoverflow.com/questions/12446990/how-to-detect-iphone-5-widescreen-devices iPhone 5 screen missing the Default 568h@2x.png image as the screen size will still be 320x480 in such a case. I don't think this may be an issue as I don't see why we would want to detect an iPhone 5 in a non optimized app. Final note Comments and suggestions have been incorporated in this post. Thanks to everybody. share..
Add UIPickerView & a Button in Action sheet - How? http://stackoverflow.com/questions/1262574/add-uipickerview-a-button-in-action-sheet-how
How do I associate file types with an iPhone application? http://stackoverflow.com/questions/2774343/how-do-i-associate-file-types-with-an-iphone-application The LSItemContentTypes key lets you provide an array of Uniform Type Identifiers UTIs that your application can open. For a list of system defined UTIs see Apple's Uniform Type Identifiers Reference . Even more detail on UTIs can be found in Apple's Uniform Type Identifiers Overview . Those guides reside in the Mac..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 fat for armv6 armv7 and i386 Since Apple's latest changes the Simulator part isn't the same as the arm6 arm7 difference any more it's a different problem see above iphone xcode share improve this question ALTERNATIVES https gist.github.com 3705459 easy copy paste of latest version but install instructions may change.. iphone xcode share improve this question ALTERNATIVES https gist.github.com 3705459 easy copy paste of latest version but install instructions may change see below Karl's library http stackoverflow.com a 5721978 153422 takes much more effort to setup but much nicer long term solution it converts your library into a Framework.. inside each other from Xcode 3.x through to Xcode 4.6.x Bonus script to let you auto include Bundles i.e. include PNG files PLIST files etc from your library see below scroll to bottom now supports iPhone5 using Apple's workaround to the bugs in lipo . NOTE the install instructions have changed I can probably simplify this..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints a real time render of new zoom levels. CATiledLayer Method Theres a significant Overhead time drawing a full PDF page to a CALayer individual tiles can be seen rendering even with a tileSize tweak CALayers cant be prepared ahead of time rendered off screen . Generally PDF viewers are pretty heavy on memory too. Even monitor.. it while the scale is x1. CATiledLayer rendering kicks in once the scale is 1. iBooks takes a similar double take approach as if you scroll the pages you can see a lower res version of the page for just less than a second before a crisp version appears. Im rendering 2 pages each side of the page in focus so that the PDF.. ZoomingPDF zooming UIScrollView CATiledLayer vfr reader zooming paging UIScrollView CATiledView brow leaves paging with nice transitions skim everything it seems PDF reader editor for OSX iphone ios ipad pdf calayer share improve this question I have build such kind of application using approximatively the same approach..
How to link to apps on the app store http://stackoverflow.com/questions/433907/how-to-link-to-apps-on-the-app-store
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c the delegate methods you're interested in. Though with delegates that use a formal protocol you must declare your delegate to implement that protocol see below. For example suppose you have an NSWindow. If you'd like to implement its delegate's windowDidMove method you could create a class like this @implementation.. it as the window's delegate MyClass myDelegate MyClass alloc init window setDelegate myDelegate On the NSWindow side it probably has code similar to this to see if the delegate responds to the windowDidMove message using respondsToSelector and send it if appropriate. if self delegate respondsToSelector @selector windowDidMove..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c that string you'd need to call retain explicitly and then explicitly release it when you're done. Consider the following very contrived bit of code and you'll see a situation where autorelease is required NSString createHelloWorldString NSString s NSString alloc initWithString @ Hello World Now what We want to return s but..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature is the best way to deal with the NSDateFormatter locale &ldquo feature&rdquo It seems that NSDateFormatter has a feature that bites you unexpectedly If you do a simple fixed format operation such as NSDateFormatter fmt NSDateFormatter alloc init.. to 12. Then the above starts tacking AM or PM onto the end of the resulting string. See eg NSDateFormatter am I doing something wrong or is this a bug And see https developer.apple.com library ios qa qa1480 _index.html Apparently Apple has declared this to be BAD Broken As Designed and they aren't going to fix it. The.. would set the locale in the init method. Requires changing two lines the alloc init line and the added import. Added This is what I've come up with so far seems to work in all scenarios @implementation BNSDateFormatter id init static NSLocale en_US_POSIX nil NSDateFormatter me super init if en_US_POSIX nil en_US_POSIX..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage iphone uikit core graphics quartz graphics share improve this question Yes CGContexts have their y axis pointing up while in UIKit it points down. See the docs . Edit after reading code You also want to set the blend mode to replace before drawing the image since you want the image's alpha value not the one which..
Assertion failure in dequeueReusableCellWithIdentifier:forIndexPath: http://stackoverflow.com/questions/12737860/assertion-failure-in-dequeuereusablecellwithidentifierforindexpath
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone of the Core OS on the iPhone. Both 10.4 and 10.5 have usr include CommonCrypto although 10.5 has a man page for CCCryptor.3cc and 10.4 doesn't so YMMV. EDIT See this follow up question on using Base64 encoding for representing encrypted data bytes as a string if desired using safe lossless conversions. share improve this..
Using SSL in an iPhone App - Export Compliance http://stackoverflow.com/questions/2128927/using-ssl-in-an-iphone-app-export-compliance to find this answer The process has changed as of Summer 2010 and you probably need an ERN now not a CCATS as was necessary at the time John wrote his answer. See Apple iTunes export restrictions on apps . The iTunes connect faq also contains a lot of useful information on export compliance. There are also now restrictions..
http://stackoverflow.com/questions/2496554/easiest-way-to-support-multiple-orientations-how-do-i-load-a-custom-nib-when-th orientation before a view controller loads. Instead you hardwire the app to start in a particular orientation usually portrait and then immediately rotate. See mobile Safari. It always starts in portrait and then rotates to landscape. These are the two methods I used to swap out my portrait and landscape views. All three..
How To Make iPhone App compatible with multiple SDK (firmware) versions http://stackoverflow.com/questions/3027120/how-to-make-iphone-app-compatible-with-multiple-sdk-firmware-versions NEW w XCode 4.2 To support older devices you need to add armv6 to the build architectures and remove armv7 from the plist of required device capabilities. See these SO questions and answers for more details deployment target vs base active sdk recommended way to support backward compatibility How do you optionally use..
Install xCode 3.2.3 w/ iPhone SDK 4, get “Base SDK missing”, can't see other SDKs http://stackoverflow.com/questions/3161385/install-xcode-3-2-3-w-iphone-sdk-4-get-base-sdk-missing-cant-see-other-sdk Deployment iPhone OS Deployment Target select the lowest version you want to support. Note that support for 2.x versions through the app store is deprecated. See the Readiness Checklist quote above. Base SDK location for Xcode 4 and above Follow the steps above but for Step #2 click the following Select the Project navigator..
Detecting touch screen devices with Javascript http://stackoverflow.com/questions/3974827/detecting-touch-screen-devices-with-javascript
Change User Agent in UIWebView (iPhone SDK) http://stackoverflow.com/questions/478387/change-user-agent-in-uiwebview-iphone-sdk dictionary NSDictionary dictionaryWithObjectsAndKeys @ Your user agent @ UserAgent nil NSUserDefaults standardUserDefaults registerDefaults dictionary See previous edits on this post if you need methods that work in versions of iOS before 4.3 5.0. Note that because of the extensive edits the following comments other..
How do I set up a simple delegate to communicate between two view controllers? http://stackoverflow.com/questions/6168919/how-do-i-set-up-a-simple-delegate-to-communicate-between-two-view-controllers 2. Declaration of the view controller class as usual @interface ChildViewController UIViewController Delegate properties should always be weak references See http stackoverflow.com a 4796131 263871 for the rationale Tip If you're not using ARC use `assign` instead of `weak` @property nonatomic weak id ChildViewControllerDelegate..
iOS 5 Best Practice (Release/retain?) http://stackoverflow.com/questions/6308425/ios-5-best-practice-release-retain to use them until the developers release an update which is compatible with ARC. Edit I recently discovered that you can turn off ARC on a per file basis. See pixelfreak 's answer . So my advice still stands but now the 3rd party libraries shouldn't need to be updated to work with ARC. Here's what Apple says about opting..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature their phone set to a 24 hour region sets the 12 24 hour switch in settings to 12. Then the above starts tacking AM or PM onto the end of the resulting string. See eg NSDateFormatter am I doing something wrong or is this a bug And see https developer.apple.com library ios qa qa1480 _index.html Apparently Apple has declared.. @ en_US_POSIX me setLocale en_US_POSIX return me @end Bounty I'll award the bounty to the best legitimate suggestion critique I see by mid day Tuesday. See below deadline extended. Update Re OMZ's proposal here is what I'm finding Here is the category version h file #import Foundation Foundation.h @interface NSDateFormatter.. simply didn't. The locale of the formatter is still en_GB. It appears that there is something strange about an init method in a category. Final answer See the accepted answer below. iphone ios locale nsdateformatter share improve this question Instead of subclassing you could create an NSDateFormatter category..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown
GCD, Threads, Program Flow and UI Updating http://stackoverflow.com/questions/7290931/gcd-threads-program-flow-and-ui-updating first let's look at your code. You cannot wait where you want to in the code above. Here's the code you had. Where you say wait in the comment is incorrect. See where I added NO. void solvePuzzle id sender solveButton.enabled NO solveButton.title @ Working . . . . I've tried using this as a Background thread but I can't..
How can we programmatically detect which iOS version is device running on? [duplicate] http://stackoverflow.com/questions/7848766/how-can-we-programmatically-detect-which-ios-version-is-device-running-on c ios cocoa touch ios4 share improve this question Best current version without need to deal with numeric search within NSString is to define macros See original answer Check iPhone iOS Version Those macros do exist in github see https github.com carlj CJAMacros blob master CJAMacros CJAMacros.h Like this #define..
iOS Launching Settings -> Restrictions URL Scheme http://stackoverflow.com/questions/8246070/ios-launching-settings-restrictions-url-scheme obvious . Thanks iphone ios settings url scheme share improve this question WARNING This method will not work for devices running iOS 5.1 and greater See Hlung's comment below. It's possible that the path component has a different name than the actual section but it's also possible that you can't currently access..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud FUD I see a lot of people saying imageNamed is bad but equal numbers of people saying the performance is good especially when rendering UITableView s. See this SO question for example or this article on iPhoneDeveloperTips.com UIImage 's imageNamed method used to leak so it was best avoided but has been fixed in recent..
How to check for an active Internet Connection on iPhone SDK? http://stackoverflow.com/questions/1083701/how-to-check-for-an-active-internet-connection-on-iphone-sdk to check for an active Internet Connection on iPhone SDK I would like to check to see if I have an Internet connection on the iPhone using the Cocoa Touch libraries. I came up with a way to do this using an.. on the iPhone using the Cocoa Touch libraries. I came up with a way to do this using an NSURL . The way I did it seems a bit unreliable because even Google could one day be down and relying on a 3rd party seems bad and while I could check.. NSURL . The way I did it seems a bit unreliable because even Google could one day be down and relying on a 3rd party seems bad and while I could check to see for a response from some other websites if Google didn't respond it does seem wasteful..
HTML character decoding in Objective-C / Cocoa Touch http://stackoverflow.com/questions/1105169/html-character-decoding-in-objective-c-cocoa-touch
How to make a UITextField move up when keyboard is present http://stackoverflow.com/questions/1126726/how-to-make-a-uitextfield-move-up-when-keyboard-is-present UITextFields that brings up a keyboard. I need it to be able to Allow scrolling of the contents of the UIScrollView to see the other text fields once the keyboard is brought up Automatically jump by scrolling up or shortening I know that I need..
How to add a breakpoint to objc_exception_throw? http://stackoverflow.com/questions/1163981/how-to-add-a-breakpoint-to-objc-exception-throw your application with breakpoints enabled it should break on the throw of these exceptions. You should then be able to see the chain of events that led to the exception within the debugger. now in this answer i want to ask how do i add location..
How to detect iPhone 5 (widescreen devices)? http://stackoverflow.com/questions/12446990/how-to-detect-iphone-5-widescreen-devices image as the screen size will still be 320x480 in such a case. I don't think this may be an issue as I don't see why we would want to detect an iPhone 5 in a non optimized app. Final note Comments and suggestions have been incorporated..
Add UIPickerView & a Button in Action sheet - How? http://stackoverflow.com/questions/1262574/add-uipickerview-a-button-in-action-sheet-how
How do I associate file types with an iPhone application? http://stackoverflow.com/questions/2774343/how-do-i-associate-file-types-with-an-iphone-application provide an array of Uniform Type Identifiers UTIs that your application can open. For a list of system defined UTIs see Apple's Uniform Type Identifiers Reference . Even more detail on UTIs can be found in Apple's Uniform Type Identifiers Overview..
Build fat static library (device + simulator) using Xcode and SDK 4+ http://stackoverflow.com/questions/3520977/build-fat-static-library-device-simulator-using-xcode-and-sdk-4 Apple's latest changes the Simulator part isn't the same as the arm6 arm7 difference any more it's a different problem see above iphone xcode share improve this question ALTERNATIVES https gist.github.com 3705459 easy copy paste of latest.. ALTERNATIVES https gist.github.com 3705459 easy copy paste of latest version but install instructions may change see below Karl's library http stackoverflow.com a 5721978 153422 takes much more effort to setup but much nicer long term solution.. to Xcode 4.6.x Bonus script to let you auto include Bundles i.e. include PNG files PLIST files etc from your library see below scroll to bottom now supports iPhone5 using Apple's workaround to the bugs in lipo . NOTE the install instructions..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints CATiledLayer Method Theres a significant Overhead time drawing a full PDF page to a CALayer individual tiles can be seen rendering even with a tileSize tweak CALayers cant be prepared ahead of time rendered off screen . Generally PDF viewers.. rendering kicks in once the scale is 1. iBooks takes a similar double take approach as if you scroll the pages you can see a lower res version of the page for just less than a second before a crisp version appears. Im rendering 2 pages each side.. vfr reader zooming paging UIScrollView CATiledView brow leaves paging with nice transitions skim everything it seems PDF reader editor for OSX iphone ios ipad pdf calayer share improve this question I have build such kind of application..
How to link to apps on the app store http://stackoverflow.com/questions/433907/how-to-link-to-apps-on-the-app-store
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c in. Though with delegates that use a formal protocol you must declare your delegate to implement that protocol see below. For example suppose you have an NSWindow. If you'd like to implement its delegate's windowDidMove method you could.. MyClass alloc init window setDelegate myDelegate On the NSWindow side it probably has code similar to this to see if the delegate responds to the windowDidMove message using respondsToSelector and send it if appropriate. if self delegate..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c and then explicitly release it when you're done. Consider the following very contrived bit of code and you'll see a situation where autorelease is required NSString createHelloWorldString NSString s NSString alloc initWithString @ Hello..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature is the best way to deal with the NSDateFormatter locale &ldquo feature&rdquo It seems that NSDateFormatter has a feature that bites you unexpectedly If you do a simple fixed format operation such as NSDateFormatter.. AM or PM onto the end of the resulting string. See eg NSDateFormatter am I doing something wrong or is this a bug And see https developer.apple.com library ios qa qa1480 _index.html Apparently Apple has declared this to be BAD Broken As Designed.. Requires changing two lines the alloc init line and the added import. Added This is what I've come up with so far seems to work in all scenarios @implementation BNSDateFormatter id init static NSLocale en_US_POSIX nil NSDateFormatter me super..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage graphics share improve this question Yes CGContexts have their y axis pointing up while in UIKit it points down. See the docs . Edit after reading code You also want to set the blend mode to replace before drawing the image since you want..
Assertion failure in dequeueReusableCellWithIdentifier:forIndexPath: http://stackoverflow.com/questions/12737860/assertion-failure-in-dequeuereusablecellwithidentifierforindexpath
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone and 10.5 have usr include CommonCrypto although 10.5 has a man page for CCCryptor.3cc and 10.4 doesn't so YMMV. EDIT See this follow up question on using Base64 encoding for representing encrypted data bytes as a string if desired using safe..
Using SSL in an iPhone App - Export Compliance http://stackoverflow.com/questions/2128927/using-ssl-in-an-iphone-app-export-compliance as of Summer 2010 and you probably need an ERN now not a CCATS as was necessary at the time John wrote his answer. See Apple iTunes export restrictions on apps . The iTunes connect faq also contains a lot of useful information on export compliance...
http://stackoverflow.com/questions/2496554/easiest-way-to-support-multiple-orientations-how-do-i-load-a-custom-nib-when-th loads. Instead you hardwire the app to start in a particular orientation usually portrait and then immediately rotate. See mobile Safari. It always starts in portrait and then rotates to landscape. These are the two methods I used to swap out..
How To Make iPhone App compatible with multiple SDK (firmware) versions http://stackoverflow.com/questions/3027120/how-to-make-iphone-app-compatible-with-multiple-sdk-firmware-versions you need to add armv6 to the build architectures and remove armv7 from the plist of required device capabilities. See these SO questions and answers for more details deployment target vs base active sdk recommended way to support backward..
Install xCode 3.2.3 w/ iPhone SDK 4, get “Base SDK missing”, can't see other SDKs http://stackoverflow.com/questions/3161385/install-xcode-3-2-3-w-iphone-sdk-4-get-base-sdk-missing-cant-see-other-sdk select the lowest version you want to support. Note that support for 2.x versions through the app store is deprecated. See the Readiness Checklist quote above. Base SDK location for Xcode 4 and above Follow the steps above but for Step #2 click..
Detecting touch screen devices with Javascript http://stackoverflow.com/questions/3974827/detecting-touch-screen-devices-with-javascript
Change User Agent in UIWebView (iPhone SDK) http://stackoverflow.com/questions/478387/change-user-agent-in-uiwebview-iphone-sdk @ Your user agent @ UserAgent nil NSUserDefaults standardUserDefaults registerDefaults dictionary See previous edits on this post if you need methods that work in versions of iOS before 4.3 5.0. Note that because of the extensive..
How do I set up a simple delegate to communicate between two view controllers? http://stackoverflow.com/questions/6168919/how-do-i-set-up-a-simple-delegate-to-communicate-between-two-view-controllers class as usual @interface ChildViewController UIViewController Delegate properties should always be weak references See http stackoverflow.com a 4796131 263871 for the rationale Tip If you're not using ARC use `assign` instead of `weak` @property..
iOS 5 Best Practice (Release/retain?) http://stackoverflow.com/questions/6308425/ios-5-best-practice-release-retain an update which is compatible with ARC. Edit I recently discovered that you can turn off ARC on a per file basis. See pixelfreak 's answer . So my advice still stands but now the 3rd party libraries shouldn't need to be updated to work with..
What is the best way to deal with the NSDateFormatter locale “feature”? http://stackoverflow.com/questions/6613110/what-is-the-best-way-to-deal-with-the-nsdateformatter-locale-feature the 12 24 hour switch in settings to 12. Then the above starts tacking AM or PM onto the end of the resulting string. See eg NSDateFormatter am I doing something wrong or is this a bug And see https developer.apple.com library ios qa qa1480 _index.html.. return me @end Bounty I'll award the bounty to the best legitimate suggestion critique I see by mid day Tuesday. See below deadline extended. Update Re OMZ's proposal here is what I'm finding Here is the category version h file #import Foundation.. formatter is still en_GB. It appears that there is something strange about an init method in a category. Final answer See the accepted answer below. iphone ios locale nsdateformatter share improve this question Instead of subclassing you..
performSelector may cause a leak because its selector is unknown http://stackoverflow.com/questions/7017281/performselector-may-cause-a-leak-because-its-selector-is-unknown
GCD, Threads, Program Flow and UI Updating http://stackoverflow.com/questions/7290931/gcd-threads-program-flow-and-ui-updating wait where you want to in the code above. Here's the code you had. Where you say wait in the comment is incorrect. See where I added NO. void solvePuzzle id sender solveButton.enabled NO solveButton.title @ Working . . . . I've tried using..
How can we programmatically detect which iOS version is device running on? [duplicate] http://stackoverflow.com/questions/7848766/how-can-we-programmatically-detect-which-ios-version-is-device-running-on this question Best current version without need to deal with numeric search within NSString is to define macros See original answer Check iPhone iOS Version Those macros do exist in github see https github.com carlj CJAMacros blob master..
iOS Launching Settings -> Restrictions URL Scheme http://stackoverflow.com/questions/8246070/ios-launching-settings-restrictions-url-scheme url scheme share improve this question WARNING This method will not work for devices running iOS 5.1 and greater See Hlung's comment below. It's possible that the path component has a different name than the actual section but it's also..
Dispelling the UIImage imageNamed: FUD http://stackoverflow.com/questions/924740/dispelling-the-uiimage-imagenamed-fud imageNamed is bad but equal numbers of people saying the performance is good especially when rendering UITableView s. See this SO question for example or this article on iPhoneDeveloperTips.com UIImage 's imageNamed method used to leak so it..
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