我在我的conde中使用MFMailComposeViewController来提供邮件功能但在发送邮件后或当我想要取消邮件时它会崩溃。
下面是我的代码：
(IBAction)FnForPlutoSupportEmailButtonPressed:(id)sender {
{
if ([MFMailComposeViewController canSendMail])
{
MFMailComposeViewController *mailer = [[MFMailComposeViewController alloc] init];
mailer.mailComposeDelegate = self;
[mailer setSubject:@"Need help from Pluto support team"];
NSArray *toRecipients = [NSArray arrayWithObjects:@"support@myplu.to",nil];
[mailer setToRecipients:toRecipients];
NSString *emailBody = @"";
[mailer setMessageBody:emailBody isHTML:NO];
//mailer.modalPresentationStyle = UIModalPresentationPageSheet;
[self presentModalViewController:mailer animated:YES];
}
else
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Failure"
message:@"Your device doesn't support the composer sheet"
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles: nil];
[alert show];
}
} }
(void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error
{
// Notifies users about errors associated with the interface
switch (result)
{ case MFMailComposeResultCancelled:
break;
case MFMailComposeResultSaved:
break;
case MFMailComposeResultSent:
break;
case MFMailComposeResultFailed:
break;
default:
break;
}
[self dismissModalViewControllerAnimated:YES];
}
我已经阅读了所有博客文章，但没有找到解决方案，This博客文章对此有很好的解释，但就此而言，我没有在viewdidload或viewdidappear中呈现我的视图控制器。
我正在获取EXE_BAD_ACCESS，以下是崩溃日志：
**
> #0 0x00000000 in ?? ()
> #1 0x01dc5aa4 in -[UIViewController _setViewAppearState:isAnimating:] ()
> #2 0x01dc5f47 in -[UIViewController __viewDidDisappear:] ()
> #3 0x01dc6039 in -[UIViewController _endAppearanceTransition:] ()
> #4 0x01dd2e7e in -[UIViewController(UIContainerViewControllerProtectedMethods) endAppearanceTransition] ()
> #5 0x01fc8de1 in -[UIWindowController transitionViewDidComplete:fromView:toView:] ()
> #6 0x01da334b in -[UITransitionView notifyDidCompleteTransition:] ()
> #7 0x01da3070 in -[UITransitionView _didCompleteTransition:] ()
> #8 0x01da531b in -[UITransitionView _transitionDidStop:finished:] ()
> #9 0x01d23fb6 in -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] ()
> #10 0x01d24154 in -[UIViewAnimationState animationDidStop:finished:] ()
> #11 0x0163bbce in CA::Layer::run_animation_callbacks ()
> #12 0x03664fe4 in _dispatch_client_callout ()
> #13 0x03655997 in _dispatch_main_queue_callback_4CF ()
> #14 0x012c03b5 in __CFRunLoopRun ()
> #15 0x012bf804 in CFRunLoopRunSpecific ()
> #16 0x012bf6db in CFRunLoopRunInMode ()
> #17 0x030f1913 in GSEventRunModal ()
> #18 0x030f1798 in GSEventRun ()
> #19 0x01ce82c1 in UIApplicationMain ()
**
根据针对ios 5的apple的更新文档，他们提到：
presentModalViewController：动画：
呈现由给定视图控制器管理给用户的模态视图。 （已弃用。请改用presentViewController:animated:completion:。）
- (void)presentModalViewController:(UIViewController *)modalViewController animated:(BOOL)animated
Parameters
解散接收者提供的视图控制器。 （已弃用。请改用dismissViewControllerAnimated:completion:。）
- (void)dismissModalViewControllerAnimated:(BOOL)animated
我也试过了，但它仍然崩溃
答案 0 :(得分：4)
您需要在您的类中保留对MFMailComposeViewController *邮件程序的强引用，并且在您关闭它之后，您可以使该引用为空。问我怎么知道这个： - ）
@implememtation MyClass
{
MFMailComposeViewController *mailer;
}
...
(IBAction)FnForPlutoSupportEmailButtonPressed:(id)sender {
{
if ([MFMailComposeViewController canSendMail])
{
/* USE IVAR */mailer = [[MFMailComposeViewController alloc] init];
稍后，当完成它时，你只需“mailer = nil;”释放它。
编辑：我所做的和建议是使用一个块来进行主队列的释放。如果您只使用'self.mailer = nil'，则在最终委托方法完成后发布并且您肯定不再使用它。
EDIT2：这种崩溃并不是所有设备上都会发生 - 我会说它在你收到最终委托方法和完成工作之间有一些竞争条件。 Apple并没有说任何关于以某种方式持有引用的方式 - 但是，Apple产品的一般做法是假设您获得的任何对象是“通过一个runLoop”“借出”，此后如果您想保留引用，则必须保留对象。
答案 1 :(得分：3)
如果您的代码中实现了sharekit框架，请转到SHK.m并更改
[[currentView parentViewController] dismissModalViewControllerAnimated:YES];
到
[currentView dismissModalViewControllerAnimated:YES];
这将解决您的问题。
感谢大家的回应。
并评论这些行
SHKSwizzle([MFMailComposeViewController class], @selector(viewDidDisappear:), @selector(SHKviewDidDisappear:));
if (NSClassFromString(@"MFMessageComposeViewController") != nil) SHKSwizzle([MFMessageComposeViewController class], @selector(viewDidDisappear:), @selector(SHKviewDidDisappear:));
答案 2 :(得分：2)
HI您可以使用以下代码发送邮件邮件应用程序将不会发送任何电子邮件表单模拟器您必须在设备上安装您的应用程序。当您尝试访问它们不在内存中的对象时，EXE_BAD_ACCESS会出现，并且remamber设备区分大小写。
-(void)sendMail:(id)sender
{
//create instance of class at runtime.
Class mailComposer = (NSClassFromString(@"MFMailComposeViewController"));
if (mailClass != nil)
{
// check the current device is configured for sending emails
//if it is not configured for mail you open mail application on device.
if ([mailClass canSendMail])
{
[self displayComposerSheet];
}
else
{
[self launchMailAppOnDevice];
}
}
else
{
[self launchMailAppOnDevice];
}
}
-(void)displayComposerSheet
{
MFMailComposeViewController *mailPicker = [[MFMailComposeViewController alloc] init];
picker.mailComposeDelegate = self;
[picker setSubject:@"Welcome!"];
//recipients
NSArray *to = [NSArray arrayWithObject:@"jhon@example.com"];
[picker setToRecipients:toRecipients];
// Attach an image
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"Default" ofType:@"png"];
NSData *imageData = [NSData dataWithContentsOfFile:filePath];
[picker addAttachmentData:myData mimeType:@"image/png" fileName:@"Default"];
// Set email body text
//NSString *emailBody = @"......!";
//[picker setMessageBody:emailBody isHTML:NO];
[self presentModalViewController:picker animated:YES];
[picker release];
}
- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult: (MFMailComposeResult)result error:(NSError*)error
{
message.hidden = NO;
// Notifies users about errors associated with the interface
switch (result)
{
case MFMailComposeResultCancelled:
message.text = @"Canceled";
break;
case MFMailComposeResultSaved:
message.text = @"Saved";
break;
case MFMailComposeResultSent:
message.text = @"Sent";
break;
case MFMailComposeResultFailed:
message.text = @"Failed";
break;
default:
message.text = @"Not sent";
break;
}
[self dismissModalViewControllerAnimated:YES];
}
-(void)launchMailAppOnDevice
{
NSString *recipients = @"";
NSString *body = @"";
NSString *email1 = [NSString stringWithFormat:@"%@%@", recipients, body];
email1 = [email1 stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:email1]];
}
答案 3 :(得分：2)
由于堆栈的停止是0x00000000，我假设UIKit中的一些代码跳转到nil函数指针。启用Zombies并查看是否出现僵尸对象访问错误。 （编辑项目方案，在“运行/调试”，“诊断”选项卡下，选中“启用僵尸对象”）
答案 4 :(得分：1)
尝试此代码，这样可以正常工作而不会崩溃..联系我们方法是按钮目标选择器..
-(void)ContactUs:(UIButton*)button
{
Class mailClass = (NSClassFromString(@"MFMailComposeViewController"));
if (mailClass != nil)
{
// We must always check whether the current device is configured for sending emails
if ([mailClass canSendMail])
{
[self displayComposerSheet];
}
else
{
[self launchMailAppOnDevice];
}
}
else
{
[self launchMailAppOnDevice];
}
}
-(void)displayComposerSheet
{
MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
picker.mailComposeDelegate = self;
//[picker setSubject:@"Hello from California!"];
// Set up recipients
NSArray *toRecipients = [NSArray arrayWithObject:@"info@imp.co.in"];
//NSArray *ccRecipients = [NSArray arrayWithObjects:@"second@example.com", @"third@example.com", nil];
//NSArray *bccRecipients = [NSArray arrayWithObject:@"fourth@example.com"];
[picker setToRecipients:toRecipients];
//[picker setCcRecipients:ccRecipients];
//[picker setBccRecipients:bccRecipients];
// Attach an image to the email
/*NSString *path = [[NSBundle mainBundle] pathForResource:@"rainy" ofType:@"png"];
NSData *myData = [NSData dataWithContentsOfFile:path];
[picker addAttachmentData:myData mimeType:@"image/png" fileName:@"rainy"];*/
// Fill out the email body text
//NSString *emailBody = @"It is raining in sunny California!";
//[picker setMessageBody:emailBody isHTML:NO];
[self presentModalViewController:picker animated:YES];
[picker release];
}
- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error
{
message.hidden = NO;
// Notifies users about errors associated with the interface
switch (result)
{
case MFMailComposeResultCancelled:
message.text = @"Canceled";
break;
case MFMailComposeResultSaved:
message.text = @"Saved";
break;
case MFMailComposeResultSent:
message.text = @"Sent";
break;
case MFMailComposeResultFailed:
message.text = @"Failed";
break;
default:
message.text = @"Not sent";
break;
}
[self dismissModalViewControllerAnimated:YES];
}
-(void)launchMailAppOnDevice
{
NSString *recipients = @"";
NSString *body = @"";
NSString *email1 = [NSString stringWithFormat:@"%@%@", recipients, body];
email1 = [email1 stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:email1]];
}
答案 5 :(得分：1)
如果您使用的是ARC，则在调用dismiss之前，控制器对象将被释放。
将对象保留在堆栈分配变量之外的某处。
答案 6 :(得分：0)
您是否在.h文件中设置了委托MFMailComposeViewControllerDelegate。我过去遇到过这样的问题。错误很小。请检查.h文件中的代表。