ios - iAd 尝试呈现视图控制器时崩溃

Question

我遇到了 iAd 崩溃，说它在转换过程中无法呈现模态视图控制器。解决方法是什么？我无法控制 iAd 如何呈现视图控制器以响应点击...

崩溃日志：

http://crashes.to/s/8454c6d34cf

Fatal Exception NSInternalInconsistencyException
Attempting to begin a modal transition from <UINavigationController: 0x15e2cd80> to <_ADRemoteViewController: 0x171d58d0> while a transition is already in progress. Wait for viewDidAppear/viewDidDisappear to know the current transition has completed
0 ...    CoreFoundation  __exceptionPreprocess + 130
1    libobjc.A.dylib     objc_exception_throw + 38
2    CoreFoundation  +[NSException raise:format:]
3    Foundation  -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 90
4    UIKit   -[UIWindowController transition:fromViewController:toViewController:target:didEndSelector:animation:] + 244
5    UIKit   -[UIViewController presentViewController:withTransition:completion:] + 4668
6    iAd     -[ADAdSpace _considerPresentingActionViewController] + 1642
7 ...    libdispatch.dylib   _dispatch_call_block_and_release + 10
8    libdispatch.dylib   _dispatch_client_callout + 22
9    libdispatch.dylib   _dispatch_main_queue_callback_4CF$VARIANT$mp + 268
10   CoreFoundation  __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8
11   CoreFoundation  __CFRunLoopRun + 1300
12   CoreFoundation  CFRunLoopRunSpecific + 522
13   CoreFoundation  CFRunLoopRunInMode + 106
14   GraphicsServices    GSEventRunModal + 138
15   UIKit   UIApplicationMain + 1136
16   YouDoodle  
AppDelegate.m line 158
main
17   YouDoodle   start + 16888