iphone - MFMailComposeViewController 崩溃

Question

if ([MFMailComposeViewController canSendMail]) {

    MFMailComposeViewController *mailViewController = [[MFMailComposeViewController alloc] init];
    mailViewController.mailComposeDelegate = self;
    [mailViewController setSubject:@"Support Enquiry"];
    [mailViewController setToRecipients:[NSArray arrayWithObject:EMAIL_SUPPORT]];

    [self presentModalViewController:mailViewController animated:YES];
    [mailViewController release];
}

我的代码在

上崩溃

MFMailComposeViewController *mailViewController = [[MFMailComposeViewController alloc] init]; 

行:

*** Terminating app due to uncaught exception 'CALayerInvalidGeometry', 
reason: 'CALayer position contains NaN: [nan 24.5]'
*** Call stack at first throw:
(
0   CoreFoundation                      0x011f75a9 __exceptionPreprocess + 185
1   libobjc.A.dylib                     0x0134b313 objc_exception_throw + 44
2   CoreFoundation                      0x011afef8 +[NSException raise:format:arguments:] + 136
3   CoreFoundation                      0x011afe6a +[NSException raise:format:] + 58
4   QuartzCore                          0x00145ba2 _ZL18CALayerSetPositionP7CALayerRKN2CA4Vec2IdEEb + 177
5   QuartzCore                          0x00145d55 -[CALayer setPosition:] + 42
6   QuartzCore                          0x0013e24d -[CALayer setFrame:] + 763
7   UIKit                               0x0047eda2 -[UIView(Geometry) setFrame:] + 255
8   UIKit                               0x004ea660 -[UITextField setFrame:] + 166
9   MessageUI                           0x001faa48 -[_MFComposeRecipientView reflow] + 3371
10  MessageUI                           0x001f9678 -[_MFComposeRecipientView setLabel:] + 79
11  MessageUI                           0x001ff144 -[MFMailComposeView _setupField:withLabel:navTitle:property:changingView:toSize:fieldFrame:visible:] + 234
12  MessageUI                           0x00203277 -[MFMailComposeView _layoutSubviews:changingView:toSize:searchResultsWereDismissed:] + 1768
13  MessageUI                           0x001fea6f -[MFMailComposeView _layoutSubviews:changingView:toSize:] + 71
14  MessageUI                           0x001fea22 -[MFMailComposeView _layoutSubviews:] + 69
15  MessageUI                           0x00200859 -[MFMailComposeView initWithFrame:navigationItem:options:delegate:] + 2175
16  MessageUI                           0x00215ea6 -[MFMailComposeController initializeUI] + 228
17  MessageUI                           0x0021cfb9 -[MFMailComposeController initForContentSize:navigationItem:options:] + 147
18  MessageUI                           0x00236267 -[MFMailComposeRootViewController initWithCompositionContext:contentSize:mailComposeControllerOptions:] + 377
19  MessageUI                           0x0022fbe7 -[MFMailComposeViewController initWithComposition:contentSize:mailComposeControllerOptions:] + 726
20  MessageUI                           0x0022f634 -[MFMailComposeViewController initWithComposition:] + 68
21  MessageUI                           0x0022f71e -[MFMailComposeViewController initWithNibName:bundle:] + 98

...

知道发生了什么吗？

编辑:到目前为止所有答案都没有做任何事情，它仍然崩溃:(

编辑2:我终于找到了问题 - 我在文本字段中添加了一个类别，而 MFMailComposeViewController 根本不喜欢这样。

Answer 1

正如提问者报告的那样，MFMailComposeViewController 使用了一些不应分类的 native 元素。因此，您必须确保 UITextField 或 UITextView 等元素上没有任何类别。