ios利用MFMailComposeViewController调用系统邮件

在程序中可能要发送邮件,我们自己完全可以实现一个邮件界面，然后自己写底层数据格式，实现发送邮件。但是iphone api中已经提供了系统写邮件界面的接口。实现的界面如下：

主要使用了MFMailComposeViewController，用来显示界面。

其中要在项目中添加下图的Frameworks。

实现代码：

    #import "sendMailViewController.h"
    @implementation sendMailViewController

    -(IBAction)sendMail
    {
        Class mailClass = (NSClassFromString(@"MFMailComposeViewController"));
        if (mailClass != nil)
        {
            // We must always check whether the current device is configured for sending emails
            if ([mailClass canSendMail])
            {
                [self displayComposerSheet];
            }
            else
            {
                [self launchMailAppOnDevice];
            }
        }
        else
        {
            [self launchMailAppOnDevice];
        }
    }
    // Dismisses the email composition interface when users tap Cancel or Send. Proceeds to update the message field with the result of the operation.
    - (void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error
    {   
    //    message.hidden = NO;
        // Notifies users about errors associated with the interface
        switch (result)
        {
               case MFMailComposeResultCancelled:
                //message.text = @"Result: canceled";
                break;
            case MFMailComposeResultSaved:
                //message.text = @"Result: saved";
                break;
            case MFMailComposeResultSent:
                //message.text = @"Result: sent";
                break;
            case MFMailComposeResultFailed:
                //message.text = @"Result: failed";
                break;
            default:
            //    message.text = @"Result: not sent";
                break;
        }
        [self dismissModalViewControllerAnimated:YES];
    }

    - (void)viewDidLoad {
        [super viewDidLoad];
    }
    - (void)viewDidUnload {
    }
    - (void)dealloc {
        [super dealloc];
    }

    -(void)displayComposerSheet
    {
        MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
        picker.title=@"New Message";
        picker.mailComposeDelegate = self;
    //[picker setSubject:@"New Message"];
    //    NSArray *toRecipients = [NSArray arrayWithObject:@"first@example.com"];
    //    NSArray *ccRecipients = [NSArray arrayWithObjects:@"second@example.com", @"third@example.com", nil];
    //    NSArray *bccRecipients = [NSArray arrayWithObject:@"fourth@example.com"];
    //    [picker setToRecipients:toRecipients];
    //    [picker setCcRecipients:ccRecipients];   
    //    [picker setBccRecipients:bccRecipients];
        // Attach an image to the email
        //NSString *path = [[NSBundle mainBundle] pathForResource:@"rainy" ofType:@"png"];
        //  NSData *myData = [NSData dataWithContentsOfFile:path];
        //    [picker addAttachmentData:myData mimeType:@"image/png" fileName:@"rainy"];
        NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"yyyy/MM/dd"];
        NSDate *date=[[NSDate alloc] init];
        NSString *content=[[NSString alloc]
                           initWithFormat:@"App:1.0.iOS:%@ Date:%@",
                           [[UIDevice currentDevice] systemVersion],[dateFormatter stringFromDate:date]];
        [date release];
        [dateFormatter release];
        [picker setMessageBody:content isHTML:NO];
        [content release];
        [self presentModalViewController:picker animated:YES];
        [picker release];
    }
    -(void)launchMailAppOnDevice
    {
        NSString *recipients = @"mailto:first@example.com?cc=second@example.com,third@example.com&subject=Hello from California!";
        NSString *body = @"&body=It is raining in sunny California!";
        NSString *email = [NSString stringWithFormat:@"%@%@", recipients, body];
        email = [email stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:email]];
    }

    @end

源代码：http://easymorse-iphone.googlecode.com/svn/trunk/sendMail/