dealloc

how to avoid that callback is sent to deallocated instance

由 本秂侑毒 提交于 2019-12-08 13:02:23
问题 The following process leads to a crash of my app: the user opens a view and a request is send to the server the request is executed in background the user navigates back to the root view the request has been finished and the following code is executed // MyDatasource.m // e.g. in connectionDidFinishLoading [callback loadedDataSource:self]; In the meantime the other models/views has been deallocated and the message is sent to a deallocated instance. callback is of type id and conforms to the

How to release IBOutlet defined as property?

由 99封情书 提交于 2019-12-08 02:45:38
问题 sorry for this question, but I searched it and I didn't find an answer for that case. I'm studying memory management for iOS and I understood, or I think so, the view lifecycle. But now I have a question on a IBOutlet (tat is linked to a UIImageView in my xib file). I have a class like this: @interface MyClass : UIViewController @property (nonatomic, retain) IBOutlet UIImageView *myImage; The question is: how can I release myImage? Is this ok? - (void)dealloc { self.myImage = nil; [super

iPhone Memory Management: No Need to Clean Up and Release Retained Objects on App Quit?

由 大城市里の小女人 提交于 2019-12-07 22:27:16
问题 Is the following true? When the app is about to quit, it's not necessary to clean up the memory by calling release on all your retained objects, because the iPhone OS will reclaim the memory it allocated for your app when you launched it. This is faster and safer than rely on the apps to correctly clean up after themselves. You can verify this by putting an NSLog call (or a debugger breakpoint) in the dealloc method of your application delegate and seeing it's never called. So, cleaning

Objective-c dealloc of boolean value

由 坚强是说给别人听的谎言 提交于 2019-12-07 17:00:55
问题 How would I dealloc a boolean value? Deallocing it this way below gives me a warning: Incompatible pointer to integer conversion assigning to 'BOOL' (aka 'signed char') from 'void *' - (void)dealloc { self.booleanVar = nil; [super dealloc]; } Perhaps I should clarify, this is from a simple class inherited from NSObject. I'm using the self.var = nil pattern that you see in Cocoa Touch classes. Let's say if it was an NSString* instead should I use self.var = nil or [var release] in the dealloc

AVPlayerItem addobserver issue in iOS8

由 匆匆过客 提交于 2019-12-07 13:37:00
问题 Hi I am playing video on my UITableViewCells using AVPlayer, It was working fine on iOS 7, but in iOS8 it crashing with following error. 'An instance 0x7c01b000 of class AVPlayerItem was deallocated while key value observers were still registered with it. Here is my code - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { ......... ......... if(cell.videoPlayer!= nil && cell.videoPlayer.currentItem != nil) { [cell.videoItem removeObserver

Suicide: Objective-C objects calling their own -dealloc methods on themselves

由 谁说胖子不能爱 提交于 2019-12-06 14:14:25
问题 Is it good practice for an object in Objective-C to commit suicide? That is, for an object to declare [self dealloc] where -dealloc permits an orderly wind down as usual? What are the principal risks? As it happens I have a specific example, a custom timer object that extends NSObject and comprises an NSTimer instance and an NSUInteger which is set to limit the number of times the timer fires. When time is up the object tells the timer to -invalidate and then commits suicide by calling its

ASIHTTPRequest dealloc and EXC_BAD_ACCESS problem

由 浪尽此生 提交于 2019-12-06 11:08:17
I'm using an array of ASIHTTPRequest wrappers (AsyncImageLoader) to download images for cells in a UITableView. I'm having problems handling ASIHTTPRequests lifetime. If I release them, I end up having a EXC_BAD_ACCESS if I keep scrolling up and down while they try to load images. Here's what my wrapper looks like. self.request has retain property, targetCell is the cell I want to put the image in: @implementation AsyncImageLoader - (void)loadImageFromURL:(NSString*)fileName target:(ResultTableViewCell*)targetCell { // check for cached images, etc NSURL* url = [NSURL URLWithString:fileName];

How to release IBOutlet defined as property?

由 ▼魔方 西西 提交于 2019-12-06 05:15:56
sorry for this question, but I searched it and I didn't find an answer for that case. I'm studying memory management for iOS and I understood, or I think so, the view lifecycle. But now I have a question on a IBOutlet (tat is linked to a UIImageView in my xib file). I have a class like this: @interface MyClass : UIViewController @property (nonatomic, retain) IBOutlet UIImageView *myImage; The question is: how can I release myImage? Is this ok? - (void)dealloc { self.myImage = nil; [super dealloc]; } - (void)viewDidUnload { [super viewDidUnload]; self.myImage = nil; } Can someone explain why

iPhone Memory Management: No Need to Clean Up and Release Retained Objects on App Quit?

由 廉价感情. 提交于 2019-12-06 04:12:54
Is the following true? When the app is about to quit, it's not necessary to clean up the memory by calling release on all your retained objects, because the iPhone OS will reclaim the memory it allocated for your app when you launched it. This is faster and safer than rely on the apps to correctly clean up after themselves. You can verify this by putting an NSLog call (or a debugger breakpoint) in the dealloc method of your application delegate and seeing it's never called. So, cleaning things up when the app is about to quit is useless. Moreover, you have very limited time before the OS wipes

UIViewController & UIview dealloc not getting called

由 这一生的挚爱 提交于 2019-12-05 05:26:58
I have a Navigation based view controller and in the view controller i have hidden the top navigation bar and use a custom UIView as the navigation bar. The UIView bar has a back button and I use Delegate methods(I have declared a protocol) to communicate to the view controller when the back button is preesed. I use delegate in my CustomNavigation Bar id delegate; and In the main View Controller when i allocate the navigation bar i set the delegate topBar = [[TopNavigationBar alloc] initWithFrame:CGRectMake(0, 0, 480, 40)]; topBar.lblTitle.text = @"Shop"; topBar.delegate = self; I release this
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