Question

在两个视图控制器之间切换时发生崩溃。基本上布局就是这样的 - ＆GT;向右滑动以显示顶部View Controller下方的左侧菜单视图 - ＆GT;启动应用程序后，将首先检查您的身份验证，一旦UIAlertView从服务器获得响应，就会显示UIAlertView，以确定您未经过身份验证。

如果在认证过程中我向右滑动以显示下方的左侧菜单视图控制器，然后选择它以在顶视图控制器返回之前启动新的视图控制器，它将加载我的第二个视图控制器但是它将显示该屏幕上的UIAlertView适用于已经关闭的顶视图控制器。因此，当您单击按钮以关闭UIAlertView时，它会崩溃应用程序。这是崩溃线程0：

    Thread 0 name:  Dispatch queue: com.apple.main-thread
    Thread 0 Crashed:
    0   libobjc.A.dylib                 0x3bcc75b0 objc_msgSend + 16
    1   UIKit                           0x35f03c4c -[UIAlertView(Private) _buttonClicked:] + 292
    2   UIKit                           0x35e970c0 -[UIApplication sendAction:to:from:forEvent:] + 68
    3   UIKit                           0x35e97072 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 26
    4   UIKit                           0x35e97050 -[UIControl sendAction:to:forEvent:] + 40
    5   UIKit                           0x35e96906 -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 498
    6   UIKit                           0x35e96dfc -[UIControl touchesEnded:withEvent:] + 484
    7   UIKit                           0x35dbf5ec -[UIWindow _sendTouchesForEvent:] + 520
    8   UIKit                           0x35dac7fc -[UIApplication sendEvent:] + 376
    9   UIKit                           0x35dac116 _UIApplicationHandleEvent + 6150
    10  GraphicsServices                0x37ac45a0 _PurpleEventCallback + 588
    11  GraphicsServices                0x37ac41ce PurpleEventCallback + 30
    12  CoreFoundation                  0x33f79170 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 32
    13  CoreFoundation                  0x33f79112 __CFRunLoopDoSource1 + 134
    14  CoreFoundation                  0x33f77f94 __CFRunLoopRun + 1380
    15  CoreFoundation                  0x33eeaeb8 CFRunLoopRunSpecific + 352
    16  CoreFoundation                  0x33eead44 CFRunLoopRunInMode + 100
    17  GraphicsServices                0x37ac32e6 GSEventRunModal + 70
    18  UIKit                           0x35e002fc UIApplicationMain + 1116
    19  iShame                          0x000bbe90 main (main.m:16)
    20  libdyld.dylib                   0x3c103b1c start + 0

这是我在顶视图控制器上的dealloc方法，我认为可以通过将它们设置为nil来解决问题：

    - (void)dealloc
    {
        noConnection = nil;
        userSetup = nil;
        userExist = nil;
        accountAlertView = nil;
        confirmed = nil;
        login = nil;

        if (_connection)
        {
            [_connection cancel];
            [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
            [MBProgressHUD hideHUDForView:self.view animated:YES];
        }
    }

任何关于去哪里的方向都将非常感激。我现在唯一能想到的就是禁用滑动操作和菜单按钮，显示菜单，直到它从用户身份验证状态的服务器收到通知。想法好吗？

潜在的解决方法：

    - (void)dealloc
    {
        [noConnection dismissWithClickedButtonIndex:0 animated:YES];// = nil;
        [userSetup dismissWithClickedButtonIndex:0 animated:YES]; //= nil;
        [userExist dismissWithClickedButtonIndex:0 animated:YES]; //= nil;
        [accountAlertView dismissWithClickedButtonIndex:0 animated:YES]; //= nil;
        [confirmed dismissWithClickedButtonIndex:0 animated:YES]; //= nil;
        [login dismissWithClickedButtonIndex:0 animated:YES]; //= nil;

        if (_connection)
        {
            [_connection cancel];
            [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
            [MBProgressHUD hideHUDForView:self.view animated:YES];
        }
    }

Answer 1

是的，你是对的。禁用顶视图控制器的滑动操作，直到在身份验证期间从服务器获得响应。根据响应启用滑动操作一次。

Answer 2

这解决了这个问题，我再也无法让它崩溃了。

- (void)dealloc
{
    [noConnection dismissWithClickedButtonIndex:0 animated:YES];// = nil;
    [userSetup dismissWithClickedButtonIndex:0 animated:YES]; //= nil;
    [userExist dismissWithClickedButtonIndex:0 animated:YES]; //= nil;
    [accountAlertView dismissWithClickedButtonIndex:0 animated:YES]; //= nil;
    [confirmed dismissWithClickedButtonIndex:0 animated:YES]; //= nil;
    [login dismissWithClickedButtonIndex:0 animated:YES]; //= nil;

    if (_connection)
    {
        [_connection cancel];
        [UIApplication sharedApplication].networkActivityIndicatorVisible = NO;
        [MBProgressHUD hideHUDForView:self.view animated:YES];
    }
}

切换视图控制器时iOS崩溃

2 个答案: