MFMailComposeViewController canSendMail返回YES但不在iOS中发送邮件

@H_810_7@mFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init]; picker.mailComposeDelegate = self; // Set the subject of email [picker setSubject:@"My data file"]; // Add email addresses [picker setToRecipients:[NSArray arrayWithObjects:emailId,nil]]; // Fill out the email body text NSString *emailBody = @"Hello,\n Please find the data from the iOS app in the attachments.\n\n Thank you.\nMy Team."; // This is not an HTML formatted email [picker setmessageBody:emailBody isHTML:NO]; // Create NSData object from file NSData *exportFileData = [NSData dataWithContentsOfFile:filePath]; // Attach image data to the email [picker addAttachmentData:exportFileData mimeType:@"text/csv" filename: [self.CSVNameTextField text]]; // Show email view if ([MFMailComposeViewController canSendMail]) { [self presentModalViewController:picker animated:YES]; }