Question

我的应用程序崩溃，仅在iOS 8.4中，当我尝试使用dismissViewControllerAnimated:NO的{{1}}之后尝试UITextField时。

更改为动画YES它运行良好，但我猜这是不正确的修复。

代码：（UIModalPresentationCurrentContext模态）

- (IBAction)openAlertWithTextField:(id)sender
{
    UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"" message:@"Type a number:" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Confirm", nil];
    [alert setAlertViewStyle:UIAlertViewStylePlainTextInput];
    UITextField * alertTextField = [alert textFieldAtIndex:0];
    [alertTextField setKeyboardType:UIKeyboardTypeNumberPad];
    [alertTextField setDelegate:self];
    [alert show];
}

#pragma mark - UIAlertViewDelegate
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (buttonIndex == 1) {
        // Crash
        [self dismissViewControllerAnimated:NO completion:nil];

        // No Crash
        [self dismissViewControllerAnimated:YES completion:nil];
    }
}

崩溃日志：

Crashed: com.apple.main-thread
EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x0000000000000010

Crashed: com.apple.main-thread
0  libobjc.A.dylib                0x1981c7bd0 objc_msgSend + 16
1  UIKit                          0x18b29c9dc -[UITextField _shouldEndEditing] + 84
2  UIKit                          0x18b21ac70 -[UIResponder resignFirstResponder] + 84
3  UIKit                          0x18b29c8bc -[UITextField resignFirstResponder] + 124
4  UIKit                          0x18b29395c -[UIView(Hierarchy) _removeFirstResponderFromSubtree] + 208
5  UIKit                          0x18b43effc __UIViewWillBeRemovedFromSuperview + 96
6  UIKit                          0x18b16ac48 -[UIView(Hierarchy) removeFromSuperview] + 108
7  UIKit                          0x18b47a94c __71-[UIPresentationController _initViewHierarchyForPresentationSuperview:]_block_invoke504 + 364
8  UIKit                          0x18b476784 -[UIPresentationController transitionDidFinish:] + 112
9  UIKit                          0x18b4790c0 __56-[UIPresentationController runTransitionForCurrentState]_block_invoke_2 + 168
10 UIKit                          0x18b292f64 -[_UIViewControllerTransitionContext completeTransition:] + 132
11 UIKit                          0x18b1a8708 -[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:] + 408
12 UIKit                          0x18b1a8270 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 188
13 UIKit                          0x18b1a8178 -[UIViewAnimationState animationDidStop:finished:] + 104
14 QuartzCore                     0x18aab162c CA::Layer::run_animation_callbacks(void*) + 296
15 libdispatch.dylib              0x198831954 _dispatch_client_callout + 16
16 libdispatch.dylib              0x19883620c _dispatch_main_queue_callback_4CF + 1608
17 CoreFoundation                 0x1866af7f8 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12
18 CoreFoundation                 0x1866ad8a0 __CFRunLoopRun + 1492
19 CoreFoundation                 0x1865d92d4 CFRunLoopRunSpecific + 396
20 GraphicsServices               0x18feef6fc GSEventRunModal + 168
21 UIKit                          0x18b1d6f40 UIApplicationMain + 1488
22 Get In Manager                 0x10006320c main (main.m:16)
23 libdyld.dylib                  0x19885ea08 start + 4

Zoombie：

2016-05-25 03:02:26.699 App[75590:5686413] *** -[MyUIViewController respondsToSelector:]: message sent to deallocated instance 0x7ff1a2f7a7f0

Answer 1

你做得太早，应该尝试这样做：

- alertView:didDismissWithButtonIndex:

Answer 2

您正在使用UIAlertview，任何按钮点击自动关闭视图。

你并没有忽视回忆UIAlertview方法的观点。例如：

[alertview show];

奇怪的dismissViewControllerAnimated崩溃 - iOS 8

2 个答案: