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

上崩溃了

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

符合：

*** 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

...

有什么想法吗？

编辑：到目前为止所有的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，MFMailComposeViewController根本不喜欢它。

Answer 1

我觉得你对iOS To:类的MFMailComposeViewController字段有疑问。可能是，您发送“收件人”字符串数组，该数组没有有效的NSString对象，而内部 iOS 尝试计算高度sizeWithFont字段使用To:的字符串。

建议您通过替换以下声明来测试上述假设。

[mailViewController setToRecipients:[NSArray arrayWithObject:EMAIL_SUPPORT]];

使用

[mailViewController setToRecipients:[NSArray arrayWithObject:@"myCompanySupport@abc.com"]];

让我知道它是否会再次崩溃同样的消息。

<强>编辑：

UITableView crash gives 'CALayerInvalidGeometry', reason: 'CALayer position contains NaN: [160 nan]'

Answer 2

当提问者报告他的问题时，MFMailComposeViewController使用了一些不应归类的原生元素。因此，您必须确保UITextField或UITextView等元素上没有任何类别。

Answer 3

尝试使用

[mailViewController setToRecipients：[NSArray arrayWithObjects：EMAIL_SUPPORT，nil]];

请参阅此链接：

http://www.edumobile.org/iphone/iphone-programming-tutorials/mailsend-in-the-iphone/

Answer 4

这是调试设置为max所得到的：

bool _WebTryThreadLock（bool），0x4be8910：尝试从主线程或Web线程以外的线程获取Web锁。这可能是从辅助线程调用UIKit的结果。现在崩溃......

虽然堆栈跟踪略有不同：

#2  0x32b69f40 in -[MFComposeBodyField initWithFrame:]
#3  0x32b69afe in -[MFMailComposeView _setupBodyFieldWithHeaderFrame:enclosingFrame:changingView:frameToPin:wasSearching:]
#4  0x32b66c12 in -[MFMailComposeView _layoutSubviews:changingView:toSize:searchResultsWereDismissed:]
#5  0x32b6651e in -[MFMailComposeView _layoutSubviews:changingView:toSize:]
#6  0x001cafe2 in -[MFMailComposeViewAccessibility(SafeCategory) _layoutSubviews:changingView:toSize:]
#7  0x32b664ee in -[MFMailComposeView _layoutSubviews:]
#8  0x32b66202 in -[MFMailComposeView initWithFrame:navigationItem:options:delegate:]
#9  0x32b65876 in -[MFMailComposeController initializeUI]
#10 0x32b656c0 in -[MFMailComposeController initForContentSize:navigationItem:options:]
#11 0x32b6558c in -[MFMailComposeRootViewController initWithCompositionContext:contentSize:mailComposeControllerOptions:]
#12 0x32b64dc2 in -[MFMailComposeViewController initWithComposition:contentSize:mailComposeControllerOptions:]
#13 0x32b64bfe in -[MFMailComposeViewController initWithComposition:]
#14 0x32b8cfb2 in -[MFMailComposeViewController initWithNibName:bundle:]
#15 0x33169a12 in -[UIViewController init]

Answer 5

除了主线程之外，您不能从任何线程访问UI。如初。

所以这确实对我的情况有所帮助：

dispatch_async(dispatch_get_main_queue(), ^{
    /* Do somthing here with UIKit here */  

MFMailComposeViewController *picker = [[[MFMailComposeViewController alloc] initWithRootViewController:view] autorelease];
picker.mailComposeDelegate = self;  
NSArray *toRecipients = [NSArray arrayWithObject: subject ];    
[picker setToRecipients:to];    
[view presentModalViewController:picker animated:YES];
});

Answer 6

如果没有任何帮助，您可以随时打开mailto url：

body= [(NSString*)CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault, (CFStringRef)body, NULL, CFSTR("?=&+"), kCFStringEncodingUTF8) autorelease];
String uri= [@"mailto:" adds:to];
uri=[[uri adds:@"?subject="] adds:subject];
uri=[[uri adds:@"&body="] adds:body];

Answer 7

MFMailComposeViewController是UINavigationController的子类，因此请确保此处的“self”具有UINavigationController。
确保您已导入MessegeUI framewok。
检查您是否在类的.h文件中确认了UINavigationController协议。

如果能解决问题，请告诉我。

谢谢！

Ishank

Answer 8

如果您将以下类别添加到文本字段，那么MFMailComposeViewController根本不喜欢它。所以避免这样做。我不知道为什么。我在写我所观察到的。

 - (CGRect)textRectForBounds:(CGRect)bounds {

          return CGRectInset( bounds , 10 , 0 );
    }

但您可以添加这些类别来自定义文本字段：

      - (CGRect)borderRectForBounds:(CGRect)bounds;
      - (CGRect)placeholderRectForBounds:(CGRect)bounds;
      - (CGRect)editingRectForBounds:(CGRect)bounds;
      - (CGRect)clearButtonRectForBounds:(CGRect)bounds;
      - (CGRect)leftViewRectForBounds:(CGRect)bounds;
      - (CGRect)rightViewRectForBounds:(CGRect)bounds;

我认为这会对你有帮助。

Answer 9

在使用ARC在iOS5 / 6上呈现视图控制器时，我遇到了同样的问题。我的解决方案是保留使用ivar呈现MFMailComposeViewController的对象。

@interface MyClass (){
     MailUtils *_mailUtils;
}
@end


{...
_mailUtils = [[MailUtils alloc] init];
[_mailUtils publish]; //in this method I create the MFMailComposeViewController
}

MFMailComposeViewController崩溃

9 个答案: