iOS:应用程序崩溃 "-[MFMailComposeInternalViewController _notifyCompositionDidFinish]"

Question

根据 crashlytic，有人在使用 iPad 时崩溃了。他们收到的崩溃错误是 -[MFMailComposeInternalViewController _notifyCompositionDidFinish] 我不知道这是怎么发生的。这是异常(exception)崩溃:com.apple.main-thread
0x0000000c 处的 EXC_BAD_ACCESS KERN_INVALID_ADDRESS

这是原始数据

Thread : Crashed: com.apple.main-thread
0  libobjc.A.dylib                0x30fa4f46 objc_msgSend + 5
1  MessageUI                      0x252e5f01 -[MFMailComposeInternalViewController _notifyCompositionDidFinish] + 464
2  CoreFoundation                 0x23524294 __invoking___ + 68
3  CoreFoundation                 0x23451435 -[NSInvocation invoke] + 300
4  libdispatch.dylib              0x314f87bb _dispatch_call_block_and_release + 10
5  libdispatch.dylib              0x314f87a7 _dispatch_client_callout + 22
6  libdispatch.dylib              0x314fbfa3 _dispatch_main_queue_callback_4CF + 718
7  CoreFoundation                 0x234e59d1   __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8
8  CoreFoundation                 0x234e40d1 __CFRunLoopRun + 1512
9  CoreFoundation                 0x23432211 CFRunLoopRunSpecific + 476
10 CoreFoundation                 0x23432023 CFRunLoopRunInMode + 106
11 GraphicsServices               0x2a7c20a9 GSEventRunModal + 136
12 UIKit                          0x26a3e1d1 UIApplicationMain + 1440
13 MyApp                          0x0009e7e7 main (main.m:16)

不确定如何诊断。

Answer 1

当释放 MFMailComposeInternalViewController 对象并触发 MFMailComposeInternalViewControllerDelegate 时，会发生此崩溃。

确保保留您的 MFMailComposeInternalViewController 对象，直到在委托(delegate)触发之后，您才可以安全地关闭 MFMailComposeInternalViewController 对象。

-(void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error
{
    switch (result) {
        case MFMailComposeResultCancelled:
            break;
        case MFMailComposeResultSaved:
            break;
        case MFMailComposeResultSent:
            break;
        case MFMailComposeResultFailed:
            break;
        default:
            break;
    }
    [controller dismissViewControllerAnimated:YES completion:nil];
}