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2014/10/15 ¤U¤È 10:13:15
iphone Programming Glossary: releasedWhen should I release objects in -(void)viewDidUnload rather than in -dealloc? http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc by the UIViewController means that even when its view is removed from the view hierarchy and released to save memory through which the subviews are also released by the view they will not actually be deallocated.. is removed from the view hierarchy and released to save memory through which the subviews are also released by the view they will not actually be deallocated because the UIViewController itself still contains..
http://stackoverflow.com/questions/1298867/convert-image-to-grayscale UIImage imageWithCGImage image CGImageRelease image free m_imageData make sure the data will be released by giving it to an autoreleased NSData NSData dataWithBytesNoCopy result length m_width m_height return.. CGImageRelease image free m_imageData make sure the data will be released by giving it to an autoreleased NSData NSData dataWithBytesNoCopy result length m_width m_height return resultUIImage share improve..
http://stackoverflow.com/questions/18736954/missing-recommended-icon-file-the-bundle-does-not-contain-an-app-icon-for-iph would happen next. To my utter amazement the app went into the review stage 20 hours later and was released on the market the very next day Kind of makes me wonder how many Apple Windows app review people lurk..
http://stackoverflow.com/questions/3245733/apple-gyroscope-sample-code based project like rotating an opengl texture using gyroscope data is there any sample code released from apple about gyroscope or any tutorial about integrating gyroscope with openGL... I searched google..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received e.g. NSString stringWithFormat then you'll have an autorelease reference which means it could be released at some time in the future by other code so it is vital that if you need to keep it around beyond the.. that you retain it. If you don't the memory may remain allocated while you are using it or be released but coincidentally still valid during your emulator testing but is more likely to be released and show.. be released but coincidentally still valid during your emulator testing but is more likely to be released and show up as bad access errors when running on the device. The best way to track these things down..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework are 256 that will save us time later. Note that this call creates an array which will need to be released later to avoid leaking setupReal vDSP_create_fftsetup log2n FFT_RADIX2 It's worth noting that if we..
Can I embed a custom font in an iPhone application? http://stackoverflow.com/questions/360751/can-i-embed-a-custom-font-in-an-iphone-application this solution. I created a simple module that extends UILabel and handles loading .ttf files. I released it opensource under the Apache license and put it on github here git github.com zynga FontLabel.git..
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 with a UIImage but instead draw the image in the layer when zooming is 1. Those tiles will be released automatically when memory warnings are issued. Whenever the user start zooming I acquire the CGPDFPage..
Text to speech on iPhone [closed] http://stackoverflow.com/questions/416064/text-to-speech-on-iphone the SDK Are there any third party TTS engines available for the iPhone AFAIK Acapela is not yet released iphone core audio share improve this question I don't think iPhone SDK provides any TTS facility..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll be used unless there is a search when the search is canceled you can see below that this object is released . All UITableView methods must figure out what table view it will query and which applicable FRC to..
Difference between [NSMutableArray array] vs [[NSMutableArray alloc] init] http://stackoverflow.com/questions/5423211/difference-between-nsmutablearray-array-vs-nsmutablearray-alloc-init cases when you create an object on iOS where you have a choice between obtaining a ready made autoreleased object and calling alloc followed by release Apple wants you to use alloc and release because this keeps.. this keeps the lifetime of the object short and under your control. The problem here is that autoreleased objects live in the autorelease pool and can pile up until the pool is drained whenever that may be... is drained whenever that may be. Another thing to watch out for is loops. You may generate autoreleased objects without being aware of it and they just pile up in the pool. The solution is to create your..
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 be valid in local scope until inner most release pool is drained attributed with ns_returns_autoreleased The call to methodForSelector assumes that the return value of the method it's calling is an object.. does not retain release it. So you could end up creating a leak if your object is supposed to be released as in #3 above that is the method you're calling returns a new object . For selectors you're trying.. returning a non object including void you could end up with a garbage pointer value being retained released and crash. Additional Arguments One consideration is that this is the same warning will occur with performSelector..
Having trouble adding objects to NSMutableArray in Objective C http://stackoverflow.com/questions/851926/having-trouble-adding-objects-to-nsmutablearray-in-objective-c id init self super init if self viewedCardsArray NSMutableArray alloc init return self Then it is released in the dealloc method void dealloc viewedCardsArray release super dealloc share improve this answer..
Objective-C ARC: strong vs retain and weak vs assign http://stackoverflow.com/questions/8927727/objective-c-arc-strong-vs-retain-and-weak-vs-assign won't which means the program will crash when I send a message to the pointer once it's been released. But if I use weak this won't ever happen because message send to nil won't do anything. I don't know..
When should I release objects in -(void)viewDidUnload rather than in -dealloc? http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc loadView for instance. The additional ownership of subviews by the UIViewController means that even when its view is removed from the view hierarchy and released to save memory through which the subviews are also released by the view they will not actually be deallocated because the UIViewController itself still contains.. by the UIViewController means that even when its view is removed from the view hierarchy and released to save memory through which the subviews are also released by the view they will not actually be deallocated because the UIViewController itself still contains its own outstanding retaining references to those objects as..
http://stackoverflow.com/questions/1298867/convert-image-to-grayscale
http://stackoverflow.com/questions/18736954/missing-recommended-icon-file-the-bundle-does-not-contain-an-app-icon-for-iph I decided to not change anything and wait to see what would happen next. To my utter amazement the app went into the review stage 20 hours later and was released on the market the very next day Kind of makes me wonder how many Apple Windows app review people lurk around here. iphone ios ios7 itunes share improve this..
http://stackoverflow.com/questions/3245733/apple-gyroscope-sample-code gyroscope sample code I am planning to develop an gyroscope based project like rotating an opengl texture using gyroscope data is there any sample code released from apple about gyroscope or any tutorial about integrating gyroscope with openGL... I searched google i didn't find anything except core motion guide and event..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received back from just about anything else including factory methods e.g. NSString stringWithFormat then you'll have an autorelease reference which means it could be released at some time in the future by other code so it is vital that if you need to keep it around beyond the immediate function that you retain it. If you don't the memory.. that if you need to keep it around beyond the immediate function that you retain it. If you don't the memory may remain allocated while you are using it or be released but coincidentally still valid during your emulator testing but is more likely to be released and show up as bad access errors when running on the device. The best.. the memory may remain allocated while you are using it or be released but coincidentally still valid during your emulator testing but is more likely to be released and show up as bad access errors when running on the device. The best way to track these things down and a good idea anyway even if there are no apparent problems..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework if we pre calculate the 256th roots of unity of which there are 256 that will save us time later. Note that this call creates an array which will need to be released later to avoid leaking setupReal vDSP_create_fftsetup log2n FFT_RADIX2 It's worth noting that if we set log2n to eg 8 you can throw these precalculated values into..
Can I embed a custom font in an iPhone application? http://stackoverflow.com/questions/360751/can-i-embed-a-custom-font-in-an-iphone-application is built in. If you need to support pre 3.2 you can still use this solution. I created a simple module that extends UILabel and handles loading .ttf files. I released it opensource under the Apache license and put it on github here git github.com zynga FontLabel.git The important files are FontLabel.h and FontLabel.m. It uses..
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 to three images in advance in a separate thread. I don't overlay with a UIImage but instead draw the image in the layer when zooming is 1. Those tiles will be released automatically when memory warnings are issued. Whenever the user start zooming I acquire the CGPDFPage and render it using the appropriate CTM. The code in void..
Text to speech on iPhone [closed] http://stackoverflow.com/questions/416064/text-to-speech-on-iphone convert text to speech in an iPhone app Is it possible using the SDK Are there any third party TTS engines available for the iPhone AFAIK Acapela is not yet released iphone core audio share improve this question I don't think iPhone SDK provides any TTS facility internally. You should use a third party TTS engine or write..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll The searchFetchedResultsController should not be used unless there is a search when the search is canceled you can see below that this object is released . All UITableView methods must figure out what table view it will query and which applicable FRC to pull the information from. The FRC delegate methods must also..
Difference between [NSMutableArray array] vs [[NSMutableArray alloc] init] http://stackoverflow.com/questions/5423211/difference-between-nsmutablearray-array-vs-nsmutablearray-alloc-init is exactly correct when you vend an object. But in other cases when you create an object on iOS where you have a choice between obtaining a ready made autoreleased object and calling alloc followed by release Apple wants you to use alloc and release because this keeps the lifetime of the object short and under your control... by release Apple wants you to use alloc and release because this keeps the lifetime of the object short and under your control. The problem here is that autoreleased objects live in the autorelease pool and can pile up until the pool is drained whenever that may be. Another thing to watch out for is loops. You may generate autoreleased.. live in the autorelease pool and can pile up until the pool is drained whenever that may be. Another thing to watch out for is loops. You may generate autoreleased objects without being aware of it and they just pile up in the pool. The solution is to create your own autorelease pool at the start of the loop and release it..
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 Do nothing assume returned object value will be valid in local scope until inner most release pool is drained attributed with ns_returns_autoreleased The call to methodForSelector assumes that the return value of the method it's calling is an object but does not retain release it. So you could end up creating.. the return value of the method it's calling is an object but does not retain release it. So you could end up creating a leak if your object is supposed to be released as in #3 above that is the method you're calling returns a new object . For selectors you're trying to call that return void or other non objects you could enable.. That means that if the method you're calling someMethod is returning a non object including void you could end up with a garbage pointer value being retained released and crash. Additional Arguments One consideration is that this is the same warning will occur with performSelector withObject and you could run into similar problems..
Having trouble adding objects to NSMutableArray in Objective C http://stackoverflow.com/questions/851926/having-trouble-adding-objects-to-nsmutablearray-in-objective-c
Objective-C ARC: strong vs retain and weak vs assign http://stackoverflow.com/questions/8927727/objective-c-arc-strong-vs-retain-and-weak-vs-assign here is that weak will assign nil to the pointer while assign won't which means the program will crash when I send a message to the pointer once it's been released. But if I use weak this won't ever happen because message send to nil won't do anything. I don't know about any differences between strong and retain . Is there..
When should I release objects in -(void)viewDidUnload rather than in -dealloc? http://stackoverflow.com/questions/1158788/when-should-i-release-objects-in-voidviewdidunload-rather-than-in-dealloc ownership of subviews by the UIViewController means that even when its view is removed from the view hierarchy and released to save memory through which the subviews are also released by the view they will not actually be deallocated because the.. even when its view is removed from the view hierarchy and released to save memory through which the subviews are also released by the view they will not actually be deallocated because the UIViewController itself still contains its own outstanding..
http://stackoverflow.com/questions/1298867/convert-image-to-grayscale UIImage resultUIImage UIImage imageWithCGImage image CGImageRelease image free m_imageData make sure the data will be released by giving it to an autoreleased NSData NSData dataWithBytesNoCopy result length m_width m_height return resultUIImage ..
http://stackoverflow.com/questions/18736954/missing-recommended-icon-file-the-bundle-does-not-contain-an-app-icon-for-iph wait to see what would happen next. To my utter amazement the app went into the review stage 20 hours later and was released on the market the very next day Kind of makes me wonder how many Apple Windows app review people lurk around here. iphone..
http://stackoverflow.com/questions/3245733/apple-gyroscope-sample-code to develop an gyroscope based project like rotating an opengl texture using gyroscope data is there any sample code released from apple about gyroscope or any tutorial about integrating gyroscope with openGL... I searched google i didn't find anything..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received factory methods e.g. NSString stringWithFormat then you'll have an autorelease reference which means it could be released at some time in the future by other code so it is vital that if you need to keep it around beyond the immediate function.. the immediate function that you retain it. If you don't the memory may remain allocated while you are using it or be released but coincidentally still valid during your emulator testing but is more likely to be released and show up as bad access.. you are using it or be released but coincidentally still valid during your emulator testing but is more likely to be released and show up as bad access errors when running on the device. The best way to track these things down and a good idea anyway..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework unity of which there are 256 that will save us time later. Note that this call creates an array which will need to be released later to avoid leaking setupReal vDSP_create_fftsetup log2n FFT_RADIX2 It's worth noting that if we set log2n to eg 8 you..
Can I embed a custom font in an iPhone application? http://stackoverflow.com/questions/360751/can-i-embed-a-custom-font-in-an-iphone-application 3.2 you can still use this solution. I created a simple module that extends UILabel and handles loading .ttf files. I released it opensource under the Apache license and put it on github here git github.com zynga FontLabel.git The important files..
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 thread. I don't overlay with a UIImage but instead draw the image in the layer when zooming is 1. Those tiles will be released automatically when memory warnings are issued. Whenever the user start zooming I acquire the CGPDFPage and render it using..
Text to speech on iPhone [closed] http://stackoverflow.com/questions/416064/text-to-speech-on-iphone Is it possible using the SDK Are there any third party TTS engines available for the iPhone AFAIK Acapela is not yet released iphone core audio share improve this question I don't think iPhone SDK provides any TTS facility internally. You should..
How to filter NSFetchedResultsController (CoreData) with UISearchDisplayController/UISearchBar http://stackoverflow.com/questions/4471289/how-to-filter-nsfetchedresultscontroller-coredata-with-uisearchdisplaycontroll should not be used unless there is a search when the search is canceled you can see below that this object is released . All UITableView methods must figure out what table view it will query and which applicable FRC to pull the information..
Difference between [NSMutableArray array] vs [[NSMutableArray alloc] init] http://stackoverflow.com/questions/5423211/difference-between-nsmutablearray-array-vs-nsmutablearray-alloc-init object. But in other cases when you create an object on iOS where you have a choice between obtaining a ready made autoreleased object and calling alloc followed by release Apple wants you to use alloc and release because this keeps the lifetime of.. and release because this keeps the lifetime of the object short and under your control. The problem here is that autoreleased objects live in the autorelease pool and can pile up until the pool is drained whenever that may be. Another thing to watch.. pile up until the pool is drained whenever that may be. Another thing to watch out for is loops. You may generate autoreleased objects without being aware of it and they just pile up in the pool. The solution is to create your own autorelease pool..
Transferring ownership of an iPhone app on the app store http://stackoverflow.com/questions/671382/transferring-ownership-of-an-iphone-app-on-the-app-store another company... ... how do we move the app to their account what's the mechanism ... can my users still get updates released by the new owner without having to re buy re download the app iphone app store share improve this question Follow Up..
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 object value will be valid in local scope until inner most release pool is drained attributed with ns_returns_autoreleased The call to methodForSelector assumes that the return value of the method it's calling is an object but does not retain.. is an object but does not retain release it. So you could end up creating a leak if your object is supposed to be released as in #3 above that is the method you're calling returns a new object . For selectors you're trying to call that return.. someMethod is returning a non object including void you could end up with a garbage pointer value being retained released and crash. Additional Arguments One consideration is that this is the same warning will occur with performSelector withObject..
Having trouble adding objects to NSMutableArray in Objective C http://stackoverflow.com/questions/851926/having-trouble-adding-objects-to-nsmutablearray-in-objective-c
Objective-C ARC: strong vs retain and weak vs assign http://stackoverflow.com/questions/8927727/objective-c-arc-strong-vs-retain-and-weak-vs-assign the pointer while assign won't which means the program will crash when I send a message to the pointer once it's been released. But if I use weak this won't ever happen because message send to nil won't do anything. I don't know about any differences..
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