Summary of several methods of sending e-mail in IOS development

NSString *url = [NSString stringWithString: @"mailto:foo@example.
com?cc=bar@&subject=Greetings%20from%20Cupertino!&body=Wish%20you%20were%20here!"]; 
[[UIApplication sharedApplication] openURL: [NSURL URLWithString: url]]; 

#import <MessageUI/>; 
 
MFMailComposeViewController* controller = [[MFMailComposeViewController alloc] init]; 
 = self; 
[controller setSubject:@"My Subject"]; 
[controller setMessageBody:@"Hello there." isHTML:NO]; 
[self presentModalViewController:controller animated:YES]; 
[controller release]; 
//The most common method is to use this method to implement sending Email. This method has the corresponding MFMailComposeViewControllerDelegate event: 
- (void)mailComposeController:(MFMailComposeViewController*)controller 
   didFinishWithResult:(MFMailComposeResult)result 
      error:(NSError*)error; 
{ 
 if (result == MFMailComposeResultSent) { 
 NSLog(@"It's away!"); 
 } 
 [self dismissModalViewControllerAnimated:YES]; 
} 
//There are some relevant data structure definitions that are described in the header file: 
enum MFMailComposeResult { 
 MFMailComposeResultCancelled,//User cancels editing email MFMailComposeResultSaved,//The user saves the email successfully MFMailComposeResultSent,//The user clicks to send and put the email in the queue MFMailComposeResultFailed//User failed to try to save or send email}; 
typedef enum MFMailComposeResult MFMailComposeResult; //Valid above iOS 3.0//Part of the methods of MFMailComposeViewController in the header file are mentioned by the way: 
+ (BOOL)canSendMail __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0); 
//If the user does not set up an email account, it will return NO. You can use the traditional method of using MFMailComposeViewController or mailto:// based on the return value, or you can choose the skpsmtpmssage mentioned above to implement the function of sending email.- (void)addAttachmentData:(NSData *)attachment mimeType:(NSString *)mimeType fileName:(NSString *)filename; 
//Naturally there is no need to say more about NSData type attachment. There is a link /assignments/media-types/ in the official document. All types listed here should be supported.  Regarding the use of mimeType, you need to rely on search engines more =]

    SKPSMTPMessage *testMsg = [[SKPSMTPMessage alloc] init]; 
   = @"test@"; 
   =@"to@"; 
   = @""; 
   = YES; 
   = @"test@"; 
   = @"test"; 
   = [NSString stringWithCString:"test" encoding:NSUTF8StringEncoding]; 
   = @"bcc@"; 
   = YES; //  doesn't work without TLS! 
 
  // Only do this for self-signed certs! 
  //  = NO; 
   = self; 
 
  NSDictionary *plainPart = [NSDictionary dictionaryWithObjectsAndKeys:@"text/plain",kSKPSMTPPartContentTypeKey, 
         [NSString stringWithCString:"Test Text" encoding:NSUTF8StringEncoding],kSKPSMTPPartMessageKey,@"8bit",kSKPSMTPPartContentTransferEncodingKey,nil]; 
 
   NSString *vcfPath = [[NSBundle mainBundle] pathForResource:@"test" ofType:@"vcf"]; 
   NSData *vcfData = [NSData dataWithContentsOfFile:vcfPath]; 
 
   NSDictionary *vcfPart = [NSDictionary dictionaryWithObjectsAndKeys:@"text/directory;\r\n\tx-unix-mode=0644;\r\n\tname=\"\"",kSKPSMTPPartContentTypeKey, 
          @"attachment;\r\n\tfilename=\"\"",kSKPSMTPPartContentDispositionKey,[vcfData encodeBase64ForData],kSKPSMTPPartMessageKey,@"base64",kSKPSMTPPartContentTransferEncodingKey,nil]; 
 
   = [NSArray arrayWithObjects:plainPart,vcfPart,nil]; 
 
  [testMsg send]; 
//This class also provides corresponding Delegate methods to enable you to better understand the sending status. 
-(void)messageSent:(SKPSMTPMessage *)message; 
-(void)messageFailed:(SKPSMTPMessage *)message error:(NSError *)error;