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2014/10/15 ¤U¤È 10:14:43
iphone Programming Glossary: takesHow can I upload a photo to a server with the iPhone? http://stackoverflow.com/questions/125306/how-can-i-upload-a-photo-to-a-server-with-the-iphone can I upload a photo to a server with the iPhone I'm writing an iPhone app that takes a photo and then uploads it to a server. How do I upload a photo to a server with Cocoa in Xcode I suppose..
http://stackoverflow.com/questions/1298867/convert-image-to-grayscale be the problem Thanks. iphone cocoa touch cgimage share improve this question What exactly takes place when you use this function Is the function returning an invalid image or is the display not showing..
Verify receipt for in App purchase http://stackoverflow.com/questions/1298998/verify-receipt-for-in-app-purchase the ol' UIActivityIndicatorView or some other HUD. Case in point That initWithData encoding call takes a loooooong time for me. A few seconds which is a small eternity in iPhone land or anywhere else online..
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone with the encrypted data I've been trying with AES256 encryption. I want to write a method which takes two NSString instances one being the message to encrypt and the other being a 'passcode' to encrypt..
UIScrollView. Any thoughts on implementing “infinite” scroll/zoom? http://stackoverflow.com/questions/1493950/uiscrollview-any-thoughts-on-implementing-infinite-scroll-zoom in but the scroll view will be able to continue zooming in further as necessary. Google Maps takes this one step further where it lazy loads more detailed views as the user zooms you may or may not choose..
Do I need to disable NSLog before release Application? http://stackoverflow.com/questions/2025471/do-i-need-to-disable-nslog-before-release-application
What are the sizes used for the iOS application splash screen? http://stackoverflow.com/questions/2634898/what-are-the-sizes-used-for-the-ios-application-splash-screen images. The screen size of the iPad is 768 1024 notice in the dimensions that follow the height takes into account a 20 pixel status bar. Filename Dimensions Default Portrait.png 768w x 1004h Default PortraitUpsideDown.png..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework Now onto the code Note the 'ip' in vDSP_fft_zrip ' in place ' ie output overwrites A 'r' means it takes real inputs Look at the documentation on vDSP_fft_zrip Real data is stored in split complex form with..
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 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..
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 presenting 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..
How to link to apps on the app store http://stackoverflow.com/questions/433907/how-to-link-to-apps-on-the-app-store am creating a free version of my iPhone game. I want to have a button inside the free version that takes people to the paid version in the app store. If I use a standard link http itunes.apple.com WebObjects..
Number of days between two NSDates http://stackoverflow.com/questions/4739483/number-of-days-between-two-nsdates values taking into consideration time as well The NSDate values are in whatever form NSDate date takes. Specifically when a user enters the inactive state in my iPhone app I store the following value exitDate..
Is there a way to make drawRect work right NOW? http://stackoverflow.com/questions/4739748/is-there-a-way-to-make-drawrect-work-right-now the responsiveness of your application. In general it is recommended that you move anything that takes a while to perform to a background thread so that the user interface can remain responsive. However..
instruments with iOS: Why does Memory Monitor disagree with Allocations? http://stackoverflow.com/questions/5518918/instruments-with-ios-why-does-memory-monitor-disagree-with-allocations for example decompressed image bitmap is not included in Allocation Instrument but it always takes most of your memory. Please Watch WWDC 2012 Session 242 iOS App Performance Memory to get the information..
CADisplayLink OpenGL rendering breaks UIScrollView behaviour http://stackoverflow.com/questions/5944050/cadisplaylink-opengl-rendering-breaks-uiscrollview-behaviour can fire continuously but it won't overload the queue with pending rendering actions if a frame takes longer than 1 60th of a second to process. Again I tried this on my iPad here and found no disruption..
Locking the Fields in MFMailComposeViewController http://stackoverflow.com/questions/6284599/locking-the-fields-in-mfmailcomposeviewcontroller overlay. I have attached an image of what this looks like while its running for the few seconds it takes . Please note I take no credit for creating the SMTP framework. It was downloaded from the internet..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c of the event loop it can call release on the object. From our perspective as programmers it takes care of calling release for us so we don't have to and in fact we shouldn't . What's important to note..
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 of subclassing you could create an NSDateFormatter category with an additional initializer that takes care of assigning the locale and possibly also a format string so you'd have a ready to use formatter..
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 types don't match . Finally you call the function pointer. Complex Example When the selector takes arguments or returns a value you'll have to change things a bit SEL selector NSSelectorFromString @..
canonical way to randomize an NSArray in Objective C http://stackoverflow.com/questions/791232/canonical-way-to-randomize-an-nsarray-in-objective-c @end Chooses a random integer below n without bias. Computes m a power of two slightly above n and takes random modulo m then throws away the random number if it's between n and m. More naive techniques like..
How can I upload a photo to a server with the iPhone? http://stackoverflow.com/questions/125306/how-can-i-upload-a-photo-to-a-server-with-the-iphone can I upload a photo to a server with the iPhone I'm writing an iPhone app that takes a photo and then uploads it to a server. How do I upload a photo to a server with Cocoa in Xcode I suppose I use NSUrl somewhere. Thanks iphone cocoa touch cocoa..
http://stackoverflow.com/questions/1298867/convert-image-to-grayscale image But imageToDisplay doesn't display. What may be the problem Thanks. iphone cocoa touch cgimage share improve this question What exactly takes place when you use this function Is the function returning an invalid image or is the display not showing it correctly This is the method I use to convert to greyscale...
Verify receipt for in App purchase http://stackoverflow.com/questions/1298998/verify-receipt-for-in-app-purchase request. You may want to post it asynchronously and put up the ol' UIActivityIndicatorView or some other HUD. Case in point That initWithData encoding call takes a loooooong time for me. A few seconds which is a small eternity in iPhone land or anywhere else online for that matter . Showing some sort of indeterminate progress..
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone to be able to encrypt a string returning another string with the encrypted data I've been trying with AES256 encryption. I want to write a method which takes two NSString instances one being the message to encrypt and the other being a 'passcode' to encrypt it with I suspect I'd have to generate the encryption key with..
UIScrollView. Any thoughts on implementing “infinite” scroll/zoom? http://stackoverflow.com/questions/1493950/uiscrollview-any-thoughts-on-implementing-infinite-scroll-zoom
Do I need to disable NSLog before release Application? http://stackoverflow.com/questions/2025471/do-i-need-to-disable-nslog-before-release-application
What are the sizes used for the iOS application splash screen? http://stackoverflow.com/questions/2634898/what-are-the-sizes-used-for-the-ios-application-splash-screen a new naming convention has been created for iPad launch images. The screen size of the iPad is 768 1024 notice in the dimensions that follow the height takes into account a 20 pixel status bar. Filename Dimensions Default Portrait.png 768w x 1004h Default PortraitUpsideDown.png 768w x 1004h Default Landscape.png 1024w..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework frames to get the precise frequency for a given bin. Ok Now onto the code Note the 'ip' in vDSP_fft_zrip ' in place ' ie output overwrites A 'r' means it takes real inputs Look at the documentation on vDSP_fft_zrip Real data is stored in split complex form with odd reals stored on the imaginary side of the split complex..
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 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 . RECENT CHANGES Info on how to use this script with a project..
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 UIImage of a page in a separate thread issues here too and presenting 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...
How to link to apps on the app store http://stackoverflow.com/questions/433907/how-to-link-to-apps-on-the-app-store to link to apps on the app store So I am creating a free version of my iPhone game. I want to have a button inside the free version that takes people to the paid version in the app store. If I use a standard link http itunes.apple.com WebObjects MZStore.woa wa viewSoftware id 300136119 mt 8 the iphone..
Number of days between two NSDates http://stackoverflow.com/questions/4739483/number-of-days-between-two-nsdates How could I determine the number of days between two NSDate values taking into consideration time as well The NSDate values are in whatever form NSDate date takes. Specifically when a user enters the inactive state in my iPhone app I store the following value exitDate NSDate date And when they open the app back up I get the..
Is there a way to make drawRect work right NOW? http://stackoverflow.com/questions/4739748/is-there-a-way-to-make-drawrect-work-right-now performed on the main thread. However this still may reduce the responsiveness of your application. In general it is recommended that you move anything that takes a while to perform to a background thread so that the user interface can remain responsive. However any updates you wish to perform to the UI need to be done back..
instruments with iOS: Why does Memory Monitor disagree with Allocations? http://stackoverflow.com/questions/5518918/instruments-with-ios-why-does-memory-monitor-disagree-with-allocations
CADisplayLink OpenGL rendering breaks UIScrollView behaviour http://stackoverflow.com/questions/5944050/cadisplaylink-opengl-rendering-breaks-uiscrollview-behaviour isn't in the middle of executing. That way the CADisplayLink can fire continuously but it won't overload the queue with pending rendering actions if a frame takes longer than 1 60th of a second to process. Again I tried this on my iPad here and found no disruption to the scrolling action of a table view just a little slowdown..
Locking the Fields in MFMailComposeViewController http://stackoverflow.com/questions/6284599/locking-the-fields-in-mfmailcomposeviewcontroller some code that sends the email with a nice please wait overlay. I have attached an image of what this looks like while its running for the few seconds it takes . Please note I take no credit for creating the SMTP framework. It was downloaded from the internet after searching for it forever. The zip file that you can download..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c knows that once it gets an opportunity after the current iteration of the event loop it can call release on the object. From our perspective as programmers it takes care of calling release for us so we don't have to and in fact we shouldn't . What's important to note is that again by convention all object creation class methods..
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 locale nsdateformatter share improve this question Instead of subclassing you could create an NSDateFormatter category with an additional initializer that takes care of assigning the locale and possibly also a format string so you'd have a ready to use formatter right after initializing it. @interface NSDateFormatter LocaleAdditions..
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 what you're doing and not to generate a warning since the pointer types don't match . Finally you call the function pointer. Complex Example When the selector takes arguments or returns a value you'll have to change things a bit SEL selector NSSelectorFromString @ processRegion ofView IMP imp _controller methodForSelector selector..
canonical way to randomize an NSArray in Objective C http://stackoverflow.com/questions/791232/canonical-way-to-randomize-an-nsarray-in-objective-c it @interface NSMutableArray ArchUtils_Shuffle void shuffle @end Chooses a random integer below n without bias. Computes m a power of two slightly above n and takes random modulo m then throws away the random number if it's between n and m. More naive techniques like taking random modulo n introduce a bias towards smaller numbers..
How can I upload a photo to a server with the iPhone? http://stackoverflow.com/questions/125306/how-can-i-upload-a-photo-to-a-server-with-the-iphone can I upload a photo to a server with the iPhone I'm writing an iPhone app that takes a photo and then uploads it to a server. How do I upload a photo to a server with Cocoa in Xcode I suppose I use NSUrl somewhere...
http://stackoverflow.com/questions/1298867/convert-image-to-grayscale display. What may be the problem Thanks. iphone cocoa touch cgimage share improve this question What exactly takes place when you use this function Is the function returning an invalid image or is the display not showing it correctly This..
Verify receipt for in App purchase http://stackoverflow.com/questions/1298998/verify-receipt-for-in-app-purchase and put up the ol' UIActivityIndicatorView or some other HUD. Case in point That initWithData encoding call takes a loooooong time for me. A few seconds which is a small eternity in iPhone land or anywhere else online for that matter..
AES Encryption for an NSString on the iPhone http://stackoverflow.com/questions/1400246/aes-encryption-for-an-nsstring-on-the-iphone another string with the encrypted data I've been trying with AES256 encryption. I want to write a method which takes two NSString instances one being the message to encrypt and the other being a 'passcode' to encrypt it with I suspect I'd..
UIScrollView. Any thoughts on implementing “infinite” scroll/zoom? http://stackoverflow.com/questions/1493950/uiscrollview-any-thoughts-on-implementing-infinite-scroll-zoom will still appear zoomed in but the scroll view will be able to continue zooming in further as necessary. Google Maps takes this one step further where it lazy loads more detailed views as the user zooms you may or may not choose to implement this...
Do I need to disable NSLog before release Application? http://stackoverflow.com/questions/2025471/do-i-need-to-disable-nslog-before-release-application
What are the sizes used for the iOS application splash screen? http://stackoverflow.com/questions/2634898/what-are-the-sizes-used-for-the-ios-application-splash-screen for iPad launch images. The screen size of the iPad is 768 1024 notice in the dimensions that follow the height takes into account a 20 pixel status bar. Filename Dimensions Default Portrait.png 768w x 1004h Default PortraitUpsideDown.png..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework for a given bin. Ok Now onto the code Note the 'ip' in vDSP_fft_zrip ' in place ' ie output overwrites A 'r' means it takes real inputs Look at the documentation on vDSP_fft_zrip Real data is stored in split complex form with odd reals stored on..
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 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 . RECENT CHANGES Info..
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 issues here too and presenting 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..
How to link to apps on the app store http://stackoverflow.com/questions/433907/how-to-link-to-apps-on-the-app-store the app store So I am creating a free version of my iPhone game. I want to have a button inside the free version that takes people to the paid version in the app store. If I use a standard link http itunes.apple.com WebObjects MZStore.woa wa viewSoftware..
Number of days between two NSDates http://stackoverflow.com/questions/4739483/number-of-days-between-two-nsdates between two NSDate values taking into consideration time as well The NSDate values are in whatever form NSDate date takes. Specifically when a user enters the inactive state in my iPhone app I store the following value exitDate NSDate date And..
Is there a way to make drawRect work right NOW? http://stackoverflow.com/questions/4739748/is-there-a-way-to-make-drawrect-work-right-now this still may reduce the responsiveness of your application. In general it is recommended that you move anything that takes a while to perform to a background thread so that the user interface can remain responsive. However any updates you wish..
instruments with iOS: Why does Memory Monitor disagree with Allocations? http://stackoverflow.com/questions/5518918/instruments-with-ios-why-does-memory-monitor-disagree-with-allocations and some framework buffer for example decompressed image bitmap is not included in Allocation Instrument but it always takes most of your memory. Please Watch WWDC 2012 Session 242 iOS App Performance Memory to get the information from Apple. share..
CADisplayLink OpenGL rendering breaks UIScrollView behaviour http://stackoverflow.com/questions/5944050/cadisplaylink-opengl-rendering-breaks-uiscrollview-behaviour way the CADisplayLink can fire continuously but it won't overload the queue with pending rendering actions if a frame takes longer than 1 60th of a second to process. Again I tried this on my iPad here and found no disruption to the scrolling action..
Locking the Fields in MFMailComposeViewController http://stackoverflow.com/questions/6284599/locking-the-fields-in-mfmailcomposeviewcontroller a nice please wait overlay. I have attached an image of what this looks like while its running for the few seconds it takes . Please note I take no credit for creating the SMTP framework. It was downloaded from the internet after searching for..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c the current iteration of the event loop it can call release on the object. From our perspective as programmers it takes care of calling release for us so we don't have to and in fact we shouldn't . What's important to note is that again by..
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 question Instead of subclassing you could create an NSDateFormatter category with an additional initializer that takes care of assigning the locale and possibly also a format string so you'd have a ready to use formatter right after initializing..
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 warning since the pointer types don't match . Finally you call the function pointer. Complex Example When the selector takes arguments or returns a value you'll have to change things a bit SEL selector NSSelectorFromString @ processRegion ofView..
canonical way to randomize an NSArray in Objective C http://stackoverflow.com/questions/791232/canonical-way-to-randomize-an-nsarray-in-objective-c void shuffle @end Chooses a random integer below n without bias. Computes m a power of two slightly above n and takes random modulo m then throws away the random number if it's between n and m. More naive techniques like taking random modulo..
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