iPhone 4 和 iPhone 5 的单独故事板仅在模拟器中导致崩溃

Question

我的项目中设置了 2 个故事板，一个用于 iPhone 4，一个用于 iPhone 5。

我在 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 中设置了切换情节提要的代码，如下所示：

  CGSize iOSDeviceScreenSize = [[UIScreen mainScreen] bounds].size;

    if (iOSDeviceScreenSize.height == 480)
    {
        // Instantiate a new storyboard object using the storyboard file named Storyboard_iPhone4
        UIStoryboard *Storyboard_iPhone4 = [UIStoryboard storyboardWithName:@"Storyboard_iPhone4" bundle:nil];

        // Instantiate the initial view controller object from the storyboard
        UIViewController *initialViewController = [Storyboard_iPhone4 instantiateInitialViewController];

        // Instantiate a UIWindow object and initialize it with the screen size of the iOS device
        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

        // Set the initial view controller to be the root view controller of the window object
        self.window.rootViewController  = initialViewController;

        // Set the window object to be the key window and show it
        [self.window makeKeyAndVisible];
    }

    if (iOSDeviceScreenSize.height >= 568)
    {   // iPhone 5 and iPod Touch 5th generation: 4 inch screen
        // Instantiate a new storyboard object using the storyboard file named Main
        UIStoryboard *Main2 = [UIStoryboard storyboardWithName:@"Main2" bundle:nil];

        UIViewController *initialViewController = [Main2 instantiateInitialViewController];
        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
        self.window.rootViewController  = initialViewController;
        [self.window makeKeyAndVisible];
    }
    else
    {
        UIStoryboard *Main2 = [UIStoryboard storyboardWithName:@"Main2" bundle:nil];
        UIViewController *initialViewController = [Main2 instantiateInitialViewController];
        self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
        self.window.rootViewController  = initialViewController;
        [self.window makeKeyAndVisible];
    }

仅在模拟器上运行时我会收到以下错误（iPhone 4 和 iPhone 5 设备可以正常工作并按预期切换情节提要）：

线程 1：EXC_BAD_ACCESS（代码=2，地址=0xc）

这发生在这里：

int main(int argc, char * argv[])
{
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}

我目前在 Xcode 5 中工作。

这是跟踪（不确定我是否正确）：

libobjc.A.dylib`objc_msgSend:
0x260e0a4:  movl   0x8(%esp), %ecx
0x260e0a8:  movl   0x4(%esp), %eax
0x260e0ac:  testl  %eax, %eax
0x260e0ae:  je     0x260e110                 ; objc_msgSend + 108
0x260e0b0:  movl   (%eax), %edx
0x260e0b2:  movzwl 0xc(%edx), %eax
0x260e0b6:  andl   %ecx, %eax
0x260e0b8:  shll   $0x3, %eax
0x260e0bb:  addl   0x8(%edx), %eax
0x260e0be:  cmpl   (%eax), %ecx
0x260e0c0:  jne    0x260e0c5                 ; objc_msgSend + 33
0x260e0c2:  jmpl   *0x4(%eax)
0x260e0c5:  cmpl   $0x0, (%eax)
0x260e0c8:  je     0x260e119                 ; objc_msgSend + 117
0x260e0ca:  cmpl   0x8(%edx), %eax
0x260e0cd:  je     0x260e0d9                 ; objc_msgSend + 53
0x260e0cf:  subl   $0x8, %eax
0x260e0d2:  cmpl   (%eax), %ecx
0x260e0d4:  jne    0x260e0c5                 ; objc_msgSend + 33
0x260e0d6:  jmpl   *0x4(%eax)
0x260e0d9:  movzwl 0xc(%edx), %eax
0x260e0dd:  shll   $0x3, %eax
0x260e0e0:  addl   0x8(%edx), %eax
0x260e0e3:  jmp    0x260e0f2                 ; objc_msgSend + 78
0x260e0e5:  cmpl   $0x0, (%eax)
0x260e0e8:  je     0x260e119                 ; objc_msgSend + 117
0x260e0ea:  cmpl   0x8(%edx), %eax
0x260e0ed:  je     0x260e0f9                 ; objc_msgSend + 85
0x260e0ef:  subl   $0x8, %eax
0x260e0f2:  cmpl   (%eax), %ecx
0x260e0f4:  jne    0x260e0e5                 ; objc_msgSend + 65
0x260e0f6:  jmpl   *0x4(%eax)
0x260e0f9:  pushl  %ebp
0x260e0fa:  movl   %esp, %ebp
0x260e0fc:  pushl  $0x0
0x260e0fe:  pushl  $0x0
0x260e100:  pushl  $0x0
0x260e102:  pushl  %edx
0x260e103:  pushl  %ecx
0x260e104:  movl   0x8(%ebp), %ecx
0x260e107:  pushl  %ecx
0x260e108:  calll  0x25fc720                 ; objc_msgSend_corrupt_cache_error
0x260e10d:  nopl   (%eax)
0x260e110:  xorl   %edx, %edx
0x260e112:  xorps  %xmm0, %xmm0
0x260e115:  xorps  %xmm1, %xmm1
0x260e118:  ret    
0x260e119:  movl   0x8(%esp), %ecx
0x260e11d:  movl   0x4(%esp), %eax
0x260e121:  pushl  %ebp
0x260e122:  movl   %esp, %ebp
0x260e124:  subl   $0xc, %esp
0x260e127:  pushl  %edx
0x260e128:  pushl  %ecx
0x260e129:  pushl  %eax
0x260e12a:  calll  0x260606f                 ; _class_lookupMethodAndLoadCache3
0x260e12f:  leave  
0x260e130:  cmpl   %eax, %eax
0x260e132:  jmpl   *%eax

Answer 1

因此，根据控制台的图像，崩溃是因为一条消息被发送到一个已释放的实例。你可以从右边看到 lldb() 它说 [_UIDelayedPresentationContext delayingController] 消息发送到释放的实例

我想知道这在模拟器中会在哪些设备上崩溃 - 它会在 3.5 英寸和 4 英寸设备上崩溃吗？

我突然想到的一件事是，您的第一个 if 语句启动了从 Storyboard_iPhone4 故事板创建 UIWindow 和 UINavigationController 的过程。然后紧接着你有一个 if-else 做完全相同的事情，但来自不同的故事板。因此，如果设备不是 4 英寸设备，您最终会创建两次窗口，我想知道这是否是崩溃的根源。如果删除第一个 if 语句会改变事情吗？