Question

我正在尝试通过电子邮件发送设备日志文件并使用以下代码。我能够通过Wi-Fi网络发送iPod Touch和iPad中的电子邮件。但是当我试图通过3G网络在iPhone上发送电子邮件时，就会崩溃。我推出了代码并且知道在执行presentModalViewController时崩溃了。

请帮助我，如何解决此问题。

- (IBAction)sendEmail:(id)sender
{
  MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
  picker.mailComposeDelegate = self;
 
  // Set the subject of email
  [picker setSubject:@"Debug Log"];
 
  // Add email addresses
  [picker setToRecipients:[NSArray arrayWithObjects:@"emailaddress1@domainName.com", @"emailaddress2@domainName.com", nil]];
 
  // Fill out the email body text
  NSString *emailBody = @"Debug Log content…… ";
 
  // This is not an HTML formatted email
  [picker setMessageBody:emailBody isHTML:NO];
 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,    
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *logPath = [documentsDirectory   
stringByAppendingPathComponent:@"console.log"];
NSData *data = [NSData dataWithContentsOfFile:logPath];
  [picker addAttachmentData:data mimeType:@"text/xml" fileName:@"console.log"];
 
  // Show email view    
  [self presentModalViewController:picker animated:YES];//app crash
 
  // Release picker
  [picker release];
}
 
- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error 
{
  // Called once the email is sent
  // Remove the email view controller   
  [self dismissModalViewControllerAnimated:YES];
}

Answer 1

在发送邮件之前，请检查是否在iOS设备中配置了电子邮件。

您可以在发送邮件之前检查通过代码发送邮件的功能，如下所示。

- (IBAction)sendEmail:(id)sender
{
  MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
  picker.mailComposeDelegate = self;
 
  // Set the subject of email
  [picker setSubject:@"Debug Log"];
 
  // Add email addresses
  [picker setToRecipients:[NSArray arrayWithObjects:@"emailaddress1@domainName.com", @"emailaddress2@domainName.com", nil]];
 
  // Fill out the email body text
  NSString *emailBody = @"Debug Log content…… ";
 
  // This is not an HTML formatted email
  [picker setMessageBody:emailBody isHTML:NO];
 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,    
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *logPath = [documentsDirectory   
stringByAppendingPathComponent:@"console.log"];
NSData *data = [NSData dataWithContentsOfFile:logPath];

  [picker addAttachmentData:data mimeType:@"text/xml" fileName:@"console.log"];
 
  // Show email view    
 Class mailClass = (NSClassFromString(@"MFMailComposeViewController"));
  if (mailClass != nil) {
    // We must always check whether the current device is configured for sending emails
    if ([mailClass canSendMail]) {
      [self presentModalViewController:picker animated:YES];
    } else {
      //do something
    }
  } else {
   //do something
  } 
  // Release picker
  [picker release];
}

- (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error 
{
  // Called once the email is sent
  // Remove the email view controller   
  [self dismissModalViewControllerAnimated:YES];
}

Answer 2

简单的答案是使用此代码段将您的调用封装到presentModalViewController：

Class mailClass = (NSClassFromString(@"MFMailComposeViewController"));
if (mailClass != nil)
{ 
    if ([mailClass canSendMail])
    {
        [self presentModalViewController:YOURMAILCOMPOSER animated:YES];
    }
}

这甚至可以为您的用户提供一个自动生成的警报视图，告诉他们在继续之前设置邮件帐户...

在3G上发送电子邮件时，presentModalViewController崩溃

2 个答案: