exc-bad-access

问题 I have started a very simple project to learn iOS programming, but I get EXC_BAD_ACCESS after touchesBegan . You can download the project from DropBox here . I basically have a UIView subclass that should draw circles wherever the user is touching. Very simple but I cannot make it work. Any help is highly appreciated. Thanks! EDIT Turns out the problem is this line of code in touchesBegan : ts = [NSMutableSet setWithSet: [event touchesForView:self]]; That I changed into: ts = [[NSMutableSet

问题 The problem is when I write a Letter like "Pasar" the error not showing, but when I press space the error like exc_bad_access showing, why can it be? any one can't tell me about exc_bad_access.. I'am using xcode 4.2 and build at iPhone 5.0 Simulator. 回答1: Try using NSZombies. In your project info, set NSZombieEnabled to YES. Read this to enable NSZombie in your project. Its just a memory management problem. You'll be releasing something earlier and then using it or you'll be using some

问题 I have started working more with delegate as suggested in another question I made. Now, I have made a UIViewController called ProfileViewController in which I would like to load the News Feed from Facebook. I also have subclass of NSObject called FBFeed . This subclass loads the Facebook News Feed and should pass it back to the view controller. All my requests to Facebook are sent through a singleton named FBRequestWrapper which (in this case) should pass the result to FBFeed . I call

问题 I have a Core Data entity set up with the following attributes: resellerNo:Int resellerName:String I have setup an NSManagedObject as follows: class Reseller: NSManagedObject { @NSManaged var resellerNo: Int @NSManaged var resellerName: String } If I try to run this method: func createNewReseller(resellerName: String) { let context = app.managedObjectContext let resellerEntity = NSEntityDescription.entityForName("Resellers", inManagedObjectContext: context) let newReseller = Reseller(entity:

问题 How can this statement ever give me bad access? myWebView = [[NewsWebViewController alloc] initWithNibName:@"NewsWebViewController" bundle:nil]; [[self.view.superview superview] addSubview:myWebView.view]; if(myWebView!=nil) { [myWebView release]; myWebView = nil; } Ive ran it through instruments and it crashes every time. myWebView is an ivar in my header file. Any thoughts? Many thanks Jules 回答1: ok here is the actual issue. When I removed the webview it gets dealloc'd but I didnt set its

问题 Can someone explain why my app crashes with the following error: EXC_BAD_ACCESS(Code = 1, address= ...) This crash occurs only in 64 bit devices. I am not able to figure it out. - (NSString *)getIPAddress { NSString *address = nil; struct ifaddrs *interfaces = NULL; struct ifaddrs *temp_addr = NULL; int success = 0; // retrieve the current interfaces - returns 0 on success success = getifaddrs(&interfaces); if (success == 0) { // Loop through linked list of interfaces temp_addr = interfaces;

问题 I have a block where I am checking a user's status property from firebase. If the status property is 'free' I want to return from the block, otherwise I want to search for another user and check their status and do so until a 'free' user has been found: void( ^ myResponseBlock)(BOOL finished) = ^ void(BOOL finished) { if (finished) { if ([self.freedom isEqualToString: @"free"]) { NSLog(@"free!"); return; } else if ([self.freedom isEqualToString: @"matched"]) { NSLog(@"get another user"); /

问题 Getting Exc_Bad_Access in UIAlertView show message. UIAlertView *systemAlert1 = [[UIAlertView alloc]initWithTitle:@"System message" message:@"note" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [systemAlert1 show]; **//Crashing on this line [EXC_BAD_ACCESS]** [systemAlert1 release]; Why i am getting this?? Please help 回答1: ANY UI stuff including the showing of alerts should be done on Main thread. If you are doing this on some other thread, it will definitely crash. 回答2: It may

问题 I'm trying to use the Canon EDSDK 2.11 on OSX with a EOS Xsi. I tried running the sample code, I've written my own code, and I even downloaded openFrameworks and an add-on for the Canon EDSK, ofxCanon, and ran its sample code. Every time any of the code reaches a call to EdsOpenSession I get a exc_bad_access error. Can anyone tell me what might be going on and what I might be doing wrong? 回答1: I had the same problem. It seems there is some issues with the SDK downloaded from Canon site. Here

问题 I've created an NSOperation in the queue like so: ImageLoadingOperation *operation = [[ImageLoadingOperation alloc] initWithImageURL:url target:self action:@selector(didFinishLoadingImageWithResult:)]; [operationQueue addOperation:operation]; [operation release]; And this works fine but if the view gets popped before the operation finishes the App crashes with "EXC_BAD_ACCESS" I've tried to cancel the the operation Queue by calling cancelAllOperations but as its already in process it doesn't