dealloc

问题 I'm confused on this topic in swift where it is said that unowned references must always have a value and cannot be optional, also meaning they cannot be set to 'nil'....well I just saw a program on the Apple documents for swift that instance 'A' with an unowned reference to instance 'B' was deinitialized and deallocated right after instance 'B' was deinitialized/deallocated......when a var is deinitialzed/dealloc doesn't it mean they are set to 'nil'??? Instance B is an optional so sure it

问题 I'm trying to create a retrying mechanism for our network calls. I have created 2 classes. One a retry Class and another a Manager in case I wanted I can cancel all classes. class Retry { var url: String var maxRetries: Int init (url: String, retryCount: Int){ self.url = url self.maxRetries = maxRetries poll() RetryManager.shared.add(self) } private func poll(){ guard retryCount == 0 else{ print("error") } getRequest() } private func getRequest(){ // make network request // if no response is

问题 I am in the process of learnig objective-c and programming an iPad app. One thing I keep tripping myself up on and having to re-read is memory management. I am getting there...slowly. Basic rules such as for every alloc / retain you must have a release is useful. However, one relatively basic thing eludes me and I wonder if someone could explain... Take the following code... NSArray *myArray = [[NSArray alloc] init]; myArray = [someNSSet allObjects]; This is relatively straight forward coding

问题 I wonder if dealloc is always called when you close a ViewController in Objective-C for iOS. I've done some tests and it seems like it. Except I don't get any logs when I swipe close the application. I figured that maybe XCode doesn't log things if you fully close the app like that. The reason I wonder this is because I'm sending analytic data when one of the ViewControllers closes and I kinda need to know if dealloc is always called or if there's any better way doing this. 回答1: It's not

问题 if I run my app under iOS5 all seems to be fine. But if I try to load a view with a TabBar and some views in it. The screen looks actually like the picture below, so a black tabbar and the first subview of the tabbar which should be onscreen is deallocated. I assume, that the binding between the view and the tabbar does not exist. So I think it has something to do how I link the views with the tabbar. It works like that: NSMutableArray* controllersForHome = [[self.tabBarController

问题 In my mind, myViewController should be deallocated around the time that I pop back to the root view controller with the following code, but I never see the deallocation message getting NSLogged. If this should work, then what kind of problem can I look for in the myViewController's class that might cause it to get deallocated when I popToRootViewController? Thanks. The following gets called in my tableView: - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *

问题 Is this the correct (best?) way to release views retained in viewDidLoad , in iOS 4.x or lower? Is there anything else to consider? - (void) viewDidUnload { [super viewDidUnload]; [self releaseViews]; } - (void) dealloc { [self releaseViews]; [super dealloc]; } #define SAFE_RELEASE(a) [a release]; a = nil; - (void) releaseViews { SAFE_RELEASE(myView1); SAFE_RELEASE(myView2); SAFE_RELEASE(myView3); } 回答1: The -dealloc is correct and the -viewDidUnload will work, but typically retained views

问题 When I use -addObserverForName: object: queue: usingBlock: for NSNotificationCenter in the -viewDidLoad: method of my view controller, the -dealloc method ends up not being called. (When I remove -addObserverForName: object: queue: usingBlock: , -dealloc is called again.) Using -addObserver: selector: name: object: doesn't seem to have this problem. What am I doing wrong? (My project is using ARC.) Below is an example of my implementation, in case I'm doing something wrong here: [

问题 While displaying a popover controller for a second time (after dismissing it and then re-displaying it), I get the following error: Terminating app due to uncaught exception 'NSGenericException', reason: '-[UIPopoverController dealloc] reached while popover is still visible.' The stack trace is only a bunch of hex and the SIGABRT happens at UIApplicationMain every time. Here's the code that the button triggers: - (IBAction)createNewScore:(id)sender { if (self.pc) if (self.pc.popoverVisible)

问题 am trying here to build rss reader , the problem that when user finish read artical and press back the dealloc don't called and i got retainCount 6 & some times 7 !! i have lots of customized panels when back button pressed the view is poped and no dealloc called ?! .h file : @interface ArticalViewController : UIViewController<UIWebViewDelegate,UIScrollViewDelegate,UIActionSheetDelegate,ArticalBottomPanelDelegate,ArticalContentFetcherDelegate> { UIWebView * description_;