打開設備上的MFMailComposeViewController時出現問題，在模擬器中工作。

Question

我正在模擬器中工作，但是當我們嘗試在設備中打開時，程序正在終止。

Plz suggess me fast。

MFMailComposeViewController *mail=[[MFMailComposeViewController alloc]init]; 
mail.mailComposeDelegate=self; 
[mail setToRecipients:[NSArray arrayWithObjects:@"marketing@realestateinvestar.com.au",nil]]; 

//[self becomeFirstResponder]; 
mail.navigationBar.tintColor=[UIColor blackColor]; 
[self presentModalViewController:mail animated:YES]; 

Answer 1

你的代碼看起來不錯，但你檢查，如果設備可以發送郵件：

if ([MFMailComposeViewController canSendText]) { 
    MFMailComposeViewController *mail=[[MFMailComposeViewController alloc]init]; 
    mail.mailComposeDelegate=self; 
    [mail setToRecipients:[NSArray arrayWithObjects:@"marketing@realestateinvestar.com.au",nil]]; 

    mail.navigationBar.tintColor=[UIColor blackColor]; 
    [self presentModalViewController:mail animated:YES]; 
    [mail release], mail = nil; 
} else { 
    // show message to the use that he can't send an email. 
} 

Answer 2

你實現你的代碼MFMailComposeViewControllerdelegate方法？

#pragma mark -------------------------------------------- 
#pragma mark MFMailComposeViewController delegate Methods 

- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error { 
    switch (result) { 
     case MFMailComposeResultCancelled: 
      NSLog(@"Mail send canceled."); 
      /* 
      Execute your code for canceled event here ... 
      */ 
      break; 
     case MFMailComposeResultSaved: 
      NSLog(@"Mail saved."); 
      /* 
      Execute your code for email saved event here ... 
      */ 
      break; 
     case MFMailComposeResultSent: { 
      UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Mail Sent" message:nil delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
      alert.tag = 1; 
      alert.delegate = self; 
      [alert show]; 
      [alert release]; 
      break; 
     } 
     case MFMailComposeResultFailed: { 
      UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Mail Sending Failed" message:nil delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
      alert.tag = 2; 
      alert.delegate = self; 
      [alert show]; 
      [alert release]; 
      break; 
     } 
     default: 
      break; 
    } 
    [controller dismissModalViewControllerAnimated:YES];//dismissing modal view controller 
} 

Answer 3

if ([MFMessageComposeViewController canSendText]) 

你的問題是在這裏。您正試圖檢查設備是否可以發送短信，而不是發送電子郵件。你應該嘗試使用

if([MFMailComposeViewController canSendMail]) 

的問題可能是您的設備沒有配置任何帳戶在mail.Please一次檢查。