2014/10/15 下午 10:11:23
iphone Programming Glossary: mightHow 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 viewWillDisappear BOOL animated NSNotificationCenter defaultCenter removeObserver self Note There might be an instance using viewWillDisappear where you receive a memory warning and the observer never gets.. domain. Important Note The Reachability class is one of the most used classes in projects so you might run into naming conflicts with other projects like ShareKit. If this happens you'll have to rename one..
HTML character decoding in Objective-C / Cocoa Touch http://stackoverflow.com/questions/1105169/html-character-decoding-in-objective-c-cocoa-touch # and . I don't know of any great ways to do this in objective C but this stack overflow question might be of some help. Edit Since answering this some two years ago there are some great solutions see @Michael..
Detecting which UIButton was pressed in a UITableView http://stackoverflow.com/questions/1802707/detecting-which-uibutton-was-pressed-in-a-uitableview What's important to note is that I can't set the tag in the creation of the cell since the cell might be dequeued instead. It feels very dirty. There must be a better way. iphone uitableview uitableviewcell..
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 are specifically interested in the Xcode 3.2.4 upgrade which has a strongly related problem you might want to confer here . One SDK to rule them all Here's the deal 4.0 is now the only SDK version allowed..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework FFT and accelerate Framework Has anybody used the apple FFT for an iPhone app yet or know where I might find a sample application as to how to use it I know that apple has some sample code posted but I'm.. #include's Carbon. Carbon is for OSX. delete all the frameworks and add accelerate framework You might also need to remove an entry from info.plist that tells the project to load a xib but I'm 90 sure you..
display image from URL retrieved from ALAsset in iPhone http://stackoverflow.com/questions/3837115/display-image-from-url-retrieved-from-alasset-in-iphone to note are that this uses blocks which were new to me before I started my iOS4 porting but you might like to look at http www.mikeash.com pyblog friday qa 2008 12 26.html and http developer.apple.com library..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file setup properly it worked fine for my needs. Second depending on the format layout of your PDF you might consider using Interface Builder to create a view that serves as a template for your PDF output. You..
iPhone get SSID without private library http://stackoverflow.com/questions/5198716/iphone-get-ssid-without-private-library 01234567 Note that no ifs are supported on the simulator. Test on your device. Prior to 4.1 you might have some luck spelunking through the System Configuration dictionary. For example using scutil on my..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers he she wants to buy and then tap a checkout button to go to the checkout screen. To build this you might create a BookPickerViewController class that controlls and displays the GUI view objects. Where will.. DELEGATE that work to some other object which means that it DEPENDS on another object. So we might modify our BookPickerViewController init method as follows @implementation BookPickerViewController..
iPhone/iOS JSON parsing tutorial [closed] http://stackoverflow.com/questions/5813077/iphone-ios-json-parsing-tutorial a UITableView assuming it converts the JSON into an NSArray first . Anyone know of anything that might be useful iphone objective c ios json uitableview share improve this question You will love this..
http://stackoverflow.com/questions/603907/uiimage-resize-then-crop fits once scaled and then crop each end to fit the rest to the width. I'm working in landscape so might not have noticed any deficiencies in portrait mode. Here's my code it's part of a categeory on UIImage...
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 just NSDateFormatter fmt NSDateFormatter alloc initWithPOSIXLocaleAndFormat @ yyyyMMddHHmmss You might want to prefix your category method somehow to avoid name conflicts just in case Apple decides to add..
UIDevice uniqueIdentifier Deprecated - What To Do Now? http://stackoverflow.com/questions/6993325/uidevice-uniqueidentifier-deprecated-what-to-do-now on this property for uniquely identifying a particular device. Can anyone suggest any ideas how we might handle this problem going forward The suggestion from the documentation is... Special Considerations.. is unique if a user uninstalls and re installs the app you will get a new one each time. But you might want it to be not unique i. e. it should stay the same when the user uninstalls and re installs the..
Open source CoverFlow library for iPhone [closed] http://stackoverflow.com/questions/718984/open-source-coverflow-library-for-iphone source route. Also I'm interested in libraries that use only public APIs as using non public APIs might keep an app from getting published in the App Store. iphone coverflow share improve this question..
How to use NSJSONSerialization http://stackoverflow.com/questions/8356842/how-to-use-nsjsonserialization question Your root json object is not a dictionary but an array id 1 name Aaa id 2 name Bbb This might give you a clear picture of how to handle it NSError e nil NSArray jsonArray NSJSONSerialization JSONObjectWithData..
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 or similar method remove yourself as an observer void viewWillDisappear BOOL animated NSNotificationCenter defaultCenter removeObserver self Note There might be an instance using viewWillDisappear where you receive a memory warning and the observer never gets unregistered so you should account for that as well. Note.. use doesn't matter. It's just testing for a gateway to any domain. Important Note The Reachability class is one of the most used classes in projects so you might run into naming conflicts with other projects like ShareKit. If this happens you'll have to rename one of the pairs of Reachability.h and Reachability.m files to..
HTML character decoding in Objective-C / Cocoa Touch http://stackoverflow.com/questions/1105169/html-character-decoding-in-objective-c-cocoa-touch
Detecting which UIButton was pressed in a UITableView http://stackoverflow.com/questions/1802707/detecting-which-uibutton-was-pressed-in-a-uitableview id sender UIButton button UIButton sender int row button.tag What's important to note is that I can't set the tag in the creation of the cell since the cell might be dequeued instead. It feels very dirty. There must be a better way. iphone uitableview uitableviewcell share improve this question In Apple's Accessory sample..
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 recommend John Muchow's excellent take on this issue. If you are specifically interested in the Xcode 3.2.4 upgrade which has a strongly related problem you might want to confer here . One SDK to rule them all Here's the deal 4.0 is now the only SDK version allowed for submitting new or updated iPhone only apps. This is direct..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework the apple FFT and accelerate Framework Has anybody used the apple FFT for an iPhone app yet or know where I might find a sample application as to how to use it I know that apple has some sample code posted but I'm not really sure how to implement it into an actual project... example over whatever you have in main.m remove the line that #include's Carbon. Carbon is for OSX. delete all the frameworks and add accelerate framework You might also need to remove an entry from info.plist that tells the project to load a xib but I'm 90 sure you don't need to bother with that. NOTE Program outputs to console..
display image from URL retrieved from ALAsset in iPhone http://stackoverflow.com/questions/3837115/display-image-from-url-retrieved-from-alasset-in-iphone resultblock failureBlock failureblock A couple of things to note are that this uses blocks which were new to me before I started my iOS4 porting but you might like to look at http www.mikeash.com pyblog friday qa 2008 12 26.html and http developer.apple.com library ios #documentation Cocoa Conceptual Blocks Articles 00_Introduction.html..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file to build with my project initially but once I got my project setup properly it worked fine for my needs. Second depending on the format layout of your PDF you might consider using Interface Builder to create a view that serves as a template for your PDF output. You would then write code to load the view fill in any data e.g...
iPhone get SSID without private library http://stackoverflow.com/questions/5198716/iphone-get-ssid-without-private-library BSSID ca fe ca fe ca fe SSID XXXX SSIDDATA 01234567 01234567 01234567 Note that no ifs are supported on the simulator. Test on your device. Prior to 4.1 you might have some luck spelunking through the System Configuration dictionary. For example using scutil on my Mac scutil show State Network Interface en1 AirPort dictionary..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers in which several books are listed. The user can pick books he she wants to buy and then tap a checkout button to go to the checkout screen. To build this you might create a BookPickerViewController class that controlls and displays the GUI view objects. Where will it get all the book data Let's say it depends on a BookWarehouse.. is ready to check out Well that's not really its job. It should DELEGATE that work to some other object which means that it DEPENDS on another object. So we might modify our BookPickerViewController init method as follows @implementation BookPickerViewController void initWithWarehouse BookWarehouse warehouse andCheckoutController..
iPhone/iOS JSON parsing tutorial [closed] http://stackoverflow.com/questions/5813077/iphone-ios-json-parsing-tutorial JSON response and uses that response to populate the rows of a UITableView assuming it converts the JSON into an NSArray first . Anyone know of anything that might be useful iphone objective c ios json uitableview share improve this question You will love this framework . And you will love this tool . For learning about..
http://stackoverflow.com/questions/603907/uiimage-resize-then-crop needed the same thing in my case to pick the dimension that fits once scaled and then crop each end to fit the rest to the width. I'm working in landscape so might not have noticed any deficiencies in portrait mode. Here's my code it's part of a categeory on UIImage. Target size in my code is always set to the full screen..
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 Then you could use NSDateFormatter anywhere in your code with just NSDateFormatter fmt NSDateFormatter alloc initWithPOSIXLocaleAndFormat @ yyyyMMddHHmmss You might want to prefix your category method somehow to avoid name conflicts just in case Apple decides to add such a method in a future version of the OS. In case you're..
UIDevice uniqueIdentifier Deprecated - What To Do Now? http://stackoverflow.com/questions/6993325/uidevice-uniqueidentifier-deprecated-what-to-do-now Many of our existing apps are tightly dependent on this property for uniquely identifying a particular device. Can anyone suggest any ideas how we might handle this problem going forward The suggestion from the documentation is... Special Considerations Do not use the uniqueIdentifier property. To create a unique.. share improve this question A UUID created by CFUUIDCreate is unique if a user uninstalls and re installs the app you will get a new one each time. But you might want it to be not unique i. e. it should stay the same when the user uninstalls and re installs the app. This requires a bit of effort since the most reliable per..
Open source CoverFlow library for iPhone [closed] http://stackoverflow.com/questions/718984/open-source-coverflow-library-for-iphone per application however I'd much prefer to go the open source route. Also I'm interested in libraries that use only public APIs as using non public APIs might keep an app from getting published in the App Store. iphone coverflow share improve this question The nice people at Chaosinmotion have got the following available..
How to use NSJSONSerialization http://stackoverflow.com/questions/8356842/how-to-use-nsjsonserialization iphone objective c json nsdictionary share improve this question Your root json object is not a dictionary but an array id 1 name Aaa id 2 name Bbb This might give you a clear picture of how to handle it NSError e nil NSArray jsonArray NSJSONSerialization JSONObjectWithData data options NSJSONReadingMutableContainers..
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 as an observer void viewWillDisappear BOOL animated NSNotificationCenter defaultCenter removeObserver self Note There might be an instance using viewWillDisappear where you receive a memory warning and the observer never gets unregistered so you.. for a gateway to any domain. Important Note The Reachability class is one of the most used classes in projects so you might run into naming conflicts with other projects like ShareKit. If this happens you'll have to rename one of the pairs of Reachability.h..
HTML character decoding in Objective-C / Cocoa Touch http://stackoverflow.com/questions/1105169/html-character-decoding-in-objective-c-cocoa-touch the value between # and . I don't know of any great ways to do this in objective C but this stack overflow question might be of some help. Edit Since answering this some two years ago there are some great solutions see @Michael Waterfall's answer..
Detecting which UIButton was pressed in a UITableView http://stackoverflow.com/questions/1802707/detecting-which-uibutton-was-pressed-in-a-uitableview int row button.tag What's important to note is that I can't set the tag in the creation of the cell since the cell might be dequeued instead. It feels very dirty. There must be a better way. iphone uitableview uitableviewcell share improve..
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 on this issue. If you are specifically interested in the Xcode 3.2.4 upgrade which has a strongly related problem you might want to confer here . One SDK to rule them all Here's the deal 4.0 is now the only SDK version allowed for submitting new..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework the apple FFT and accelerate Framework Has anybody used the apple FFT for an iPhone app yet or know where I might find a sample application as to how to use it I know that apple has some sample code posted but I'm not really sure how.. remove the line that #include's Carbon. Carbon is for OSX. delete all the frameworks and add accelerate framework You might also need to remove an entry from info.plist that tells the project to load a xib but I'm 90 sure you don't need to bother..
display image from URL retrieved from ALAsset in iPhone http://stackoverflow.com/questions/3837115/display-image-from-url-retrieved-from-alasset-in-iphone A couple of things to note are that this uses blocks which were new to me before I started my iOS4 porting but you might like to look at http www.mikeash.com pyblog friday qa 2008 12 26.html and http developer.apple.com library ios #documentation..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file I got my project setup properly it worked fine for my needs. Second depending on the format layout of your PDF you might consider using Interface Builder to create a view that serves as a template for your PDF output. You would then write code..
iPhone get SSID without private library http://stackoverflow.com/questions/5198716/iphone-get-ssid-without-private-library 01234567 01234567 01234567 Note that no ifs are supported on the simulator. Test on your device. Prior to 4.1 you might have some luck spelunking through the System Configuration dictionary. For example using scutil on my Mac scutil show State..
What's the best way to communicate between view controllers? http://stackoverflow.com/questions/569940/whats-the-best-way-to-communicate-between-view-controllers user can pick books he she wants to buy and then tap a checkout button to go to the checkout screen. To build this you might create a BookPickerViewController class that controlls and displays the GUI view objects. Where will it get all the book.. really its job. It should DELEGATE that work to some other object which means that it DEPENDS on another object. So we might modify our BookPickerViewController init method as follows @implementation BookPickerViewController void initWithWarehouse..
iPhone/iOS JSON parsing tutorial [closed] http://stackoverflow.com/questions/5813077/iphone-ios-json-parsing-tutorial populate the rows of a UITableView assuming it converts the JSON into an NSArray first . Anyone know of anything that might be useful iphone objective c ios json uitableview share improve this question You will love this framework . And you..
http://stackoverflow.com/questions/603907/uiimage-resize-then-crop the dimension that fits once scaled and then crop each end to fit the rest to the width. I'm working in landscape so might not have noticed any deficiencies in portrait mode. Here's my code it's part of a categeory on UIImage. Target size in my..
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 your code with just NSDateFormatter fmt NSDateFormatter alloc initWithPOSIXLocaleAndFormat @ yyyyMMddHHmmss You might want to prefix your category method somehow to avoid name conflicts just in case Apple decides to add such a method in a..
UIDevice uniqueIdentifier Deprecated - What To Do Now? http://stackoverflow.com/questions/6993325/uidevice-uniqueidentifier-deprecated-what-to-do-now tightly dependent on this property for uniquely identifying a particular device. Can anyone suggest any ideas how we might handle this problem going forward The suggestion from the documentation is... Special Considerations Do not use the uniqueIdentifier.. by CFUUIDCreate is unique if a user uninstalls and re installs the app you will get a new one each time. But you might want it to be not unique i. e. it should stay the same when the user uninstalls and re installs the app. This requires a..
Open source CoverFlow library for iPhone [closed] http://stackoverflow.com/questions/718984/open-source-coverflow-library-for-iphone to go the open source route. Also I'm interested in libraries that use only public APIs as using non public APIs might keep an app from getting published in the App Store. iphone coverflow share improve this question The nice people at..
How to use NSJSONSerialization http://stackoverflow.com/questions/8356842/how-to-use-nsjsonserialization share improve this question Your root json object is not a dictionary but an array id 1 name Aaa id 2 name Bbb This might give you a clear picture of how to handle it NSError e nil NSArray jsonArray NSJSONSerialization JSONObjectWithData data..
http://stackoverflow.com/questions/1147628/3d-graphics-tutorials
How to determine the cursor position of a UITextField? http://stackoverflow.com/questions/1885288/how-to-determine-the-cursor-position-of-a-uitextfield input. Anywhere with input that has a very rigid syntax basically seems like a candidate for this kind of treatment. Might work well for your situation. Not sure if this is the best method but here's how I do it A UITextField to capture input..
get NSDate today, yesterday, this Week, last Week, this Month, last Month… variables http://stackoverflow.com/questions/1889164/get-nsdate-today-yesterday-this-week-last-week-this-month-last-month-var NSDate dateWithString @ 2009 11 01 00 00 00 0000 iphone time comparison nsdate share improve this question Might be a better way to write this but here what i came up on Ben's NSCalendar suggestion and working from there to NSDateComponents..
Pay for a physical product with in-app purchase http://stackoverflow.com/questions/1980595/pay-for-a-physical-product-with-in-app-purchase them pay for the order in app . I get a bill of the order in my mailbox and they just chout their name and thats it Might sound a bit low tech but if apple have someones creditcard details and a mobile ordering display then they could function..
CGContextDrawPDFPage taking up large amounts of memory http://stackoverflow.com/questions/2975240/cgcontextdrawpdfpage-taking-up-large-amounts-of-memory
How to display temporary popup message on iPhone/iPad/iOS http://stackoverflow.com/questions/3737911/how-to-display-temporary-popup-message-on-iphone-ipad-ios improve this question There is a user library on cocoacontrols.com that emulates the Android style Toast pop ups. Might be what you are looking for. http cocoacontrols.com platforms ios controls altoastview There's also this one that follows..
iPhone SDK 4 AVFoundation - How to use captureStillImageAsynchronouslyFromConnection correctly? http://stackoverflow.com/questions/3847140/iphone-sdk-4-avfoundation-how-to-use-capturestillimageasynchronouslyfromconnec only seems to work sensibly with AVCaptureSessionPresetPhoto otherwise you effectively get JPEG encoded video frames. Might as well use higher quality BGRA frames incidentally the camera's native output appears to be BGRA it doesn't appear to have..
Really cool way to create custom UITabBar for iPhone app? http://stackoverflow.com/questions/4640588/really-cool-way-to-create-custom-uitabbar-for-iphone-app
http://stackoverflow.com/questions/478242/leak-generalblock-3584 every of my leak in code will crash the app sooner or later. These GeneralBlock 3584 leaks keeps app perfectly stable. Might this be reason for AppStore rejection Thanx for any answer regarding this undocumented problem Apple is silent unfortunately..
Requesting iPhone location whilst in background? http://stackoverflow.com/questions/5807560/requesting-iphone-location-whilst-in-background using UIBackgroundModes location . Not recommended drains battery. Regularity upon request Accuracy approx. 10 65m. Might just be the only realistic option. Option_002 SLC I could use Significant Location Change but the frequency of location..
iPhone app crashes on device, File not found http://stackoverflow.com/questions/5859018/iphone-app-crashes-on-device-file-not-found
Read/write file in Documents directory problem http://stackoverflow.com/questions/6496454/read-write-file-in-documents-directory-problem documentsDirectory error NULL What have I missed or am I doing wrong while writing to this file Might it be something I need to change in my plist or some frameworks imports needed Thanks EDIT I passed a NSError object through..
What does the -ObjC linker flag do? http://stackoverflow.com/questions/6629979/what-does-the-objc-linker-flag-do does the ObjC linker flag do Simple question. Might have been answered before but was unable to get a exact answer. Right now I have an app that works with and without the..
iPhone - saving current view as image http://stackoverflow.com/questions/746421/iphone-saving-current-view-as-image to Camera roll from my application Is it possible Thanks. iphone share improve this question Found the solution. Might help someone. To save the current view as an image do the following UIGraphicsBeginImageContext pictureView.bounds.size..
How to build ICU so I can use it in an iPhone app? http://stackoverflow.com/questions/8126233/how-to-build-icu-so-i-can-use-it-in-an-iphone-app iosbuild lib libicudata.a file was built for unsupported file format which is not the architecture being linked i386 Might I be telling Xcode the wrong thing I'm right clicking on the project name then selecting Add Existing File and choosing..
Find coordinates of a substring in UILabel http://stackoverflow.com/questions/8860520/find-coordinates-of-a-substring-in-uilabel use above link to find coordinates of substring Thanks Nitish iphone nsstring uilabel share improve this question Might be you can calculate using CGSize stringSize string sizeWithFont myFont constrainedToSize maximumSize lineBreakMode self.myLabel.lineBreakMode..
Index '5' beyond bounds of empty array crash http://stackoverflow.com/questions/8962280/index-5-beyond-bounds-of-empty-array-crash processCompleted reload the table view self toggleToolBarButtons YES self tableView reloadData void processHasErrors Might be due to Internet UIAlertView alert UIAlertView alloc initWithTitle @ Achtung message @ Leider ist es im Moment nicht m繹glich..
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