尝试发送邮件和应用程序崩溃

Question

我正在尝试使用 FMailComposeViewController 发送电子邮件。当我尝试通过调用 presentModalViewController 发送邮件时，应用程序崩溃。在 emulateR 中，它一直在设备上崩溃，它崩溃了一半时间。

我没有收到错误消息，但应用程序冻结并且调试器显示它正在 int main(int argc, char * argv[]) { @autoreleasepool { 返回 UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class])); } } 并且应用程序总是在模拟器中崩溃，大约一半的时间在 iPhone 上。

代码：

- (IBAction)aEmail:(id)sender {
if([MFMailComposeViewController canSendMail]){

    MFMailComposeViewController *mailCtrl = [[MFMailComposeViewController alloc] init];
    [mailCtrl setSubject:@"Your TellaFortune Card Reading"];
    [mailCtrl setToRecipients:[NSArray arrayWithObject:@"tedpottel@yahoo.com"]];
    mailCtrl.mailComposeDelegate = self;

    [mailCtrl setMessageBody:  @"hello"  isHTML: false];

 // CRASHES ON THID LINE
    [self presentModalViewController:mailCtrl animated:NO];
    //      [mailCtrl release];

}
else
{
    UIAlertView *alert=[[ UIAlertView alloc]
                        initWithTitle:@"Cannot send email"
                        message: @"Please check internet connection and email set up"
                        delegate: self
                        cancelButtonTitle:@"Ok"
                        otherButtonTitles: nil];

    [alert show];
}

}

///////////////////////////////////////////////////////////////////////////////////////////
// if you do not have thid methed when sending emsil, app will freez after
// sent or cancel button has been pressed.

- (void)mailComposeController:(MFMailComposeViewController *)controller
      didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error {
[self dismissModalViewControllerAnimated:YES];
NSLog(@"Email result: %@", result==MFMailComposeResultCancelled?@"Cancelled":
      result==MFMailComposeResultSaved?@"Saved":
      result==MFMailComposeResultSent?@"Sent":
      result==MFMailComposeResultFailed?@"Failed":@"Unknown");
}

Answer 1

将 mailctrl 放在 ivar 中 - 你现在没有强引用它。