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2014/10/15 ¤U¤È 10:13:24
iphone Programming Glossary: retainHow 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 ASSERT aFilePath ASSERT aDelegate ASSERT aDoneSelector ASSERT anErrorSelector serverURL aServerURL retain filePath aFilePath retain delegate aDelegate retain doneSelector aDoneSelector errorSelector anErrorSelector.. ASSERT aDoneSelector ASSERT anErrorSelector serverURL aServerURL retain filePath aFilePath retain delegate aDelegate retain doneSelector aDoneSelector errorSelector anErrorSelector self upload return.. ASSERT anErrorSelector serverURL aServerURL retain filePath aFilePath retain delegate aDelegate retain doneSelector aDoneSelector errorSelector anErrorSelector self upload return self Uploader dealloc..
This class is not key value coding-compliant for the key http://stackoverflow.com/questions/3088059/this-class-is-not-key-value-coding-compliant-for-the-key SecondView.h . @interface SecondView UIViewController IBOutlet UILabel string @property nonatomic retain IBOutlet UILabel string @end Here is the code in SecondView.m Almost nothing in there apart from the..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received 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 may remain allocated while you are using it or be released but coincidentally..
Prefixing property names with an underscore in Objective C [duplicate] http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c syntax makes intent more explicit IMO. @interface Foo NSObject NSNumber bar @property readwrite retain NSNumber bar @end @implementation Foo @synthesize bar void baz NSNumber numberOne NSNumber numberWithInt..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie AVAssetWriterInput assetWriterInputWithMediaType AVMediaTypeVideo outputSettings videoSettings retain NSParameterAssert writerInput NSParameterAssert videoWriter canAddInput writerInput videoWriter addInput..
display image from URL retrieved from ALAsset in iPhone http://stackoverflow.com/questions/3837115/display-image-from-url-retrieved-from-alasset-in-iphone iref rep fullResolutionImage if iref largeimage UIImage imageWithCGImage iref largeimage retain ALAssetsLibraryAccessFailureBlock failureblock ^ NSError myerror NSLog @ booya cant get image @ myerror..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c The delegate property itself is typically declared weak in ARC or assign pre ARC to avoid retain loops since the delegate of an object often holds a strong reference to that object. For example a view..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c told it's very elegant once you understand it but I'm just not over the hump yet. How do release retain and autorelease work and what are the conventions about their use Or failing that what did you read.. you get it iphone objective c cocoa memory share improve this question Let's start with retain and release autorelease is really just a special case once you understand the basic concepts. In Cocoa.. times it is being referenced specifically the NSObject base class implements this . By calling retain on an object you are telling it that you want to up its reference count by one. By calling release you..
Objective C HTML escape/unescape http://stackoverflow.com/questions/659602/objective-c-html-escape-unescape iPhone. @interface MREntitiesConverter NSObject NSMutableString resultString @property nonatomic retain NSMutableString resultString NSString convertEntiesInString NSString s @end @implementation MREntitiesConverter..
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 values when no longer used methods in the init copy family or attributed with ns_returns_retained Do nothing assume returned object value will be valid in local scope until inner most release pool.. 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 a leak if your object is supposed to be released as in #3 above.. that aren't assigned to local variables. There's no reason that with ARC enabled that it can't retain and release the object value that's returned from methodForSelector even though you don't want to use..
Has anyone implemented the PayPal API through a native iPhone app? http://stackoverflow.com/questions/779423/has-anyone-implemented-the-paypal-api-through-a-native-iphone-app alloc initWithRequest theRequest delegate self if theConnection webData NSMutableData data retain self displayConnectingView else NSLog @ theConnection is NULL After this you need to parse the response..
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 SEL anErrorSelector IN if self super init ASSERT aServerURL ASSERT aFilePath ASSERT aDelegate ASSERT aDoneSelector ASSERT anErrorSelector serverURL aServerURL retain filePath aFilePath retain delegate aDelegate retain doneSelector aDoneSelector errorSelector anErrorSelector self upload return self Uploader dealloc Destructor... self super init ASSERT aServerURL ASSERT aFilePath ASSERT aDelegate ASSERT aDoneSelector ASSERT anErrorSelector serverURL aServerURL retain filePath aFilePath retain delegate aDelegate retain doneSelector aDoneSelector errorSelector anErrorSelector self upload return self Uploader dealloc Destructor. Results None Side.. ASSERT aFilePath ASSERT aDelegate ASSERT aDoneSelector ASSERT anErrorSelector serverURL aServerURL retain filePath aFilePath retain delegate aDelegate retain doneSelector aDoneSelector errorSelector anErrorSelector self upload return self Uploader dealloc Destructor. Results None Side effects None void dealloc..
This class is not key value coding-compliant for the key http://stackoverflow.com/questions/3088059/this-class-is-not-key-value-coding-compliant-for-the-key coding compliant for the key XXXX . Here is the code in SecondView.h . @interface SecondView UIViewController IBOutlet UILabel string @property nonatomic retain IBOutlet UILabel string @end Here is the code in SecondView.m Almost nothing in there apart from the auto generated code which I don't paste here . @implementation..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received 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 may remain allocated while you are using it or be released but coincidentally still valid during your emulator testing but is more likely..
Prefixing property names with an underscore in Objective C [duplicate] http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c does make it more possible. Using the standard message passing syntax makes intent more explicit IMO. @interface Foo NSObject NSNumber bar @property readwrite retain NSNumber bar @end @implementation Foo @synthesize bar void baz NSNumber numberOne NSNumber numberWithInt 1 Both set the value of bar through either the your custom..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie 480 AVVideoHeightKey nil AVAssetWriterInput writerInput AVAssetWriterInput assetWriterInputWithMediaType AVMediaTypeVideo outputSettings videoSettings retain NSParameterAssert writerInput NSParameterAssert videoWriter canAddInput writerInput videoWriter addInput writerInput 2 Start a session videoWriter startWriting..
display image from URL retrieved from ALAsset in iPhone http://stackoverflow.com/questions/3837115/display-image-from-url-retrieved-from-alasset-in-iphone ALAssetRepresentation rep myasset defaultRepresentation CGImageRef iref rep fullResolutionImage if iref largeimage UIImage imageWithCGImage iref largeimage retain ALAssetsLibraryAccessFailureBlock failureblock ^ NSError myerror NSLog @ booya cant get image @ myerror localizedDescription if mediaurl mediaurl length mediaurl..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c @selector windowDidMove self delegate windowDidMove notification The delegate property itself is typically declared weak in ARC or assign pre ARC to avoid retain loops since the delegate of an object often holds a strong reference to that object. For example a view controller is often the delegate of a view it contains...
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c references counting scheme has me rather confused. I'm told it's very elegant once you understand it but I'm just not over the hump yet. How do release retain and autorelease work and what are the conventions about their use Or failing that what did you read which helped you get it iphone objective c cocoa memory share.. about their use Or failing that what did you read which helped you get it iphone objective c cocoa memory share improve this question Let's start with retain and release autorelease is really just a special case once you understand the basic concepts. In Cocoa each object keeps track of how many times it is being referenced.. basic concepts. In Cocoa each object keeps track of how many times it is being referenced specifically the NSObject base class implements this . By calling retain on an object you are telling it that you want to up its reference count by one. By calling release you tell the object you are letting go of it and its reference..
Objective C HTML escape/unescape http://stackoverflow.com/questions/659602/objective-c-html-escape-unescape function but that's not available on the iPhone. @interface MREntitiesConverter NSObject NSMutableString resultString @property nonatomic retain NSMutableString resultString NSString convertEntiesInString NSString s @end @implementation MREntitiesConverter @synthesize resultString id init if super init resultString..
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 when it is no longer used standard assumption Release new object values when no longer used methods in the init copy family or attributed with ns_returns_retained 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.. 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 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.. go through a few iterations of how it handles return values that aren't assigned to local variables. There's no reason that with ARC enabled that it can't retain and release the object value that's returned from methodForSelector even though you don't want to use it. From the compiler's perspective it is an object after..
Has anyone implemented the PayPal API through a native iPhone app? http://stackoverflow.com/questions/779423/has-anyone-implemented-the-paypal-api-through-a-native-iphone-app NSUTF8StringEncoding NSURLConnection theConnection NSURLConnection alloc initWithRequest theRequest delegate self if theConnection webData NSMutableData data retain self displayConnectingView else NSLog @ theConnection is NULL After this you need to parse the response grab the session key and create a UIWebView to take them..
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 ASSERT aServerURL ASSERT aFilePath ASSERT aDelegate ASSERT aDoneSelector ASSERT anErrorSelector serverURL aServerURL retain filePath aFilePath retain delegate aDelegate retain doneSelector aDoneSelector errorSelector anErrorSelector self upload.. aFilePath ASSERT aDelegate ASSERT aDoneSelector ASSERT anErrorSelector serverURL aServerURL retain filePath aFilePath retain delegate aDelegate retain doneSelector aDoneSelector errorSelector anErrorSelector self upload return self Uploader.. ASSERT aDoneSelector ASSERT anErrorSelector serverURL aServerURL retain filePath aFilePath retain delegate aDelegate retain doneSelector aDoneSelector errorSelector anErrorSelector self upload return self Uploader dealloc Destructor. Results..
This class is not key value coding-compliant for the key http://stackoverflow.com/questions/3088059/this-class-is-not-key-value-coding-compliant-for-the-key Here is the code in SecondView.h . @interface SecondView UIViewController IBOutlet UILabel string @property nonatomic retain IBOutlet UILabel string @end Here is the code in SecondView.m Almost nothing in there apart from the auto generated code..
EXC_BAD_ACCESS signal received http://stackoverflow.com/questions/327082/exc-bad-access-signal-received 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 may remain allocated while you are using it or be released but coincidentally still valid during..
Prefixing property names with an underscore in Objective C [duplicate] http://stackoverflow.com/questions/3521254/prefixing-property-names-with-an-underscore-in-objective-c message passing syntax makes intent more explicit IMO. @interface Foo NSObject NSNumber bar @property readwrite retain NSNumber bar @end @implementation Foo @synthesize bar void baz NSNumber numberOne NSNumber numberWithInt 1 Both set the..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie writerInput AVAssetWriterInput assetWriterInputWithMediaType AVMediaTypeVideo outputSettings videoSettings retain NSParameterAssert writerInput NSParameterAssert videoWriter canAddInput writerInput videoWriter addInput writerInput 2 Start..
display image from URL retrieved from ALAsset in iPhone http://stackoverflow.com/questions/3837115/display-image-from-url-retrieved-from-alasset-in-iphone CGImageRef iref rep fullResolutionImage if iref largeimage UIImage imageWithCGImage iref largeimage retain ALAssetsLibraryAccessFailureBlock failureblock ^ NSError myerror NSLog @ booya cant get image @ myerror localizedDescription..
How do I create delegates in Objective-C? http://stackoverflow.com/questions/626898/how-do-i-create-delegates-in-objective-c windowDidMove notification The delegate property itself is typically declared weak in ARC or assign pre ARC to avoid retain loops since the delegate of an object often holds a strong reference to that object. For example a view controller is often..
Understanding reference counting with Cocoa and Objective-C http://stackoverflow.com/questions/6578/understanding-reference-counting-with-cocoa-and-objective-c rather confused. I'm told it's very elegant once you understand it but I'm just not over the hump yet. How do release retain and autorelease work and what are the conventions about their use Or failing that what did you read which helped you get.. did you read which helped you get it iphone objective c cocoa memory share improve this question Let's start with retain and release autorelease is really just a special case once you understand the basic concepts. In Cocoa each object keeps.. keeps track of how many times it is being referenced specifically the NSObject base class implements this . By calling retain on an object you are telling it that you want to up its reference count by one. By calling release you tell the object you..
Objective C HTML escape/unescape http://stackoverflow.com/questions/659602/objective-c-html-escape-unescape not available on the iPhone. @interface MREntitiesConverter NSObject NSMutableString resultString @property nonatomic retain NSMutableString resultString NSString convertEntiesInString NSString s @end @implementation MREntitiesConverter @synthesize..
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 assumption Release new object values when no longer used methods in the init copy family or attributed with ns_returns_retained Do nothing assume returned object value will be valid in local scope until inner most release pool is drained attributed.. 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 a leak if your object is supposed to be released as in #3 above that is the method.. handles return values that aren't assigned to local variables. There's no reason that with ARC enabled that it can't retain and release the object value that's returned from methodForSelector even though you don't want to use it. From the compiler's..
Has anyone implemented the PayPal API through a native iPhone app? http://stackoverflow.com/questions/779423/has-anyone-implemented-the-paypal-api-through-a-native-iphone-app NSURLConnection alloc initWithRequest theRequest delegate self if theConnection webData NSMutableData data retain self displayConnectingView else NSLog @ theConnection is NULL After this you need to parse the response grab the session..
Does a NSURLConnection retain its delegate? http://stackoverflow.com/questions/1101867/does-a-nsurlconnection-retain-its-delegate zero. However the answer is YES it does. A little bit of test code shows the delegate's retain count go up NSLog @ Retain count before d self retainCount NSURLRequest request NSURLRequest requestWithURL NSURL URLWithString @ http google.com NSURLConnection.. @ http google.com NSURLConnection conn NSURLConnection connectionWithRequest request delegate self NSLog @ Retain count after d self retainCount which produces in the log Running 2009 07 09 02 13 40.516 delegateRetain 45123 a0f Retain.. self NSLog @ Retain count after d self retainCount which produces in the log Running 2009 07 09 02 13 40.516 delegateRetain 45123 a0f Retain count before 1 2009 07 09 02 13 40.525 delegateRetain 45123 a0f Retain count after 2 Debugger stopped...
how to remove subviews from scrollview? http://stackoverflow.com/questions/1310723/how-to-remove-subviews-from-scrollview your own arrays of views of different types so you can send them removeFromSuperview messages later in the same manner Retain all your views where you create them and hold on to pointers to those views so you can send them removeFromSuperview individually..
How do I access variable values from one view controller in another? http://stackoverflow.com/questions/2548910/how-do-i-access-variable-values-from-one-view-controller-in-another scheduledTimerWithTimeInterval 1 target self selector @selector updateTimer userInfo nil repeats YES timer retain TRP Retain timer so it is not accidentally deallocated TRP Method to update the timer display void updateTimer time NSLog @ Seconds..
Do you need to release parameters of methods at the end of them in Objective-C? http://stackoverflow.com/questions/2865185/do-you-need-to-release-parameters-of-methods-at-the-end-of-them-in-objective-c
Retain/release pattern for UIPopoverController, UIActionSheet, and modal view controllers? http://stackoverflow.com/questions/2867709/retain-release-pattern-for-uipopovercontroller-uiactionsheet-and-modal-view-co release pattern for UIPopoverController UIActionSheet and modal view controllers I'm somewhat unclear on the object ownership..
Weird behaviour with retainCount http://stackoverflow.com/questions/5155559/weird-behaviour-with-retaincount objects I am having uneven behavior. See the code below NSArray aryTemp NSArray arrayWithObjects @ One nil NSLog @ Retain Count d aryTemp retainCount NSArray aryTemp2 NSArray alloc initWithObjects @ One nil NSLog @ Retain Count d aryTemp2 retainCount.. @ One nil NSLog @ Retain Count d aryTemp retainCount NSArray aryTemp2 NSArray alloc initWithObjects @ One nil NSLog @ Retain Count d aryTemp2 retainCount NSString strTemp @ One NSLog @ Retain Count d strTemp retainCount NSString strTemp2 NSString.. NSArray alloc initWithObjects @ One nil NSLog @ Retain Count d aryTemp2 retainCount NSString strTemp @ One NSLog @ Retain Count d strTemp retainCount NSString strTemp2 NSString alloc initWithString @ One NSLog @ Retain Count d strTemp2 retainCount..
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 2 There are really only 4 things that ARC would consider for the return value 3 Ignore non object types void int etc Retain object value then release when it is no longer used standard assumption Release new object values when no longer used methods..
http://stackoverflow.com/questions/7761074/arc-blocks-and-retain-cycles Blocks and Retain Cycles Working on an iOS project that targets 4.0 and 5.0 using ARC. Running into an issue related to blocks ARC and referencing..
Retain Cycles: Why is that such a bad thing? http://stackoverflow.com/questions/791322/retain-cycles-why-is-that-such-a-bad-thing Cycles Why is that such a bad thing There are two Objects A and B. A creates B and retains it. B has an instance variable..
How do I verify reference count in ARC mode? http://stackoverflow.com/questions/8863269/how-do-i-verify-reference-count-in-arc-mode so is there an alterante solution iphone ios automatic ref counting share improve this question You can use CFGetRetainCount with Objective C objects even under ARC NSLog @ Retain count is ld CFGetRetainCount __bridge CFTypeRef myObject This.. counting share improve this question You can use CFGetRetainCount with Objective C objects even under ARC NSLog @ Retain count is ld CFGetRetainCount __bridge CFTypeRef myObject This is not particularly useful for debugging though for reasons.. this question You can use CFGetRetainCount with Objective C objects even under ARC NSLog @ Retain count is ld CFGetRetainCount __bridge CFTypeRef myObject This is not particularly useful for debugging though for reasons amply described elsewhere..
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