学步园

1.添加MessageUI.framework

2.在头文件加入

// Add to top of file
#import <MessageUI/MessageUI.h>
#import <MessageUI/MFMailComposeViewController.h>
 
// Mark class as implementing MFMailComposeViewControllerDelegate
@interface RootViewController : UIViewController <MFMailComposeViewControllerDelegate> {

3.发送邮件的界面显示

- (void)mailData:(NSData *)data {
    if (![MFMailComposeViewController canSendMail]) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Oops!", @"")
                                                        message:NSLocalizedString(@"Your device cannot send mail.", @"") 
                                                       delegate:self 
                                              cancelButtonTitle:NSLocalizedString(@"OK", @"")
                                              otherButtonTitles:nil];
        [alert show];
        [alert release];
        return;
    }
 
	// Start up mail picker
	MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
 
	UINavigationBar *bar = picker.navigationBar;
	picker.mailComposeDelegate = self;
 
	[picker setSubject:@"Check out this cute wallpaper!"];
	[picker addAttachmentData:data mimeType:@"image/jpg" fileName:@"wallpaper.jpg"];
 
	// Set up the recipients.
	NSArray *toRecipients = [NSArray arrayWithObjects:nil];	
	[picker setToRecipients:toRecipients];
 
	// Fill out the email body text.
    NSString *actualBody = @"Check out this cute wallpaper!  You can download the fullscreen version for free from: http://www.vickiwenderlich.com";
	[picker setMessageBody:actualBody isHTML:NO];
 
	// Present the mail composition interface.
	[self presentModalViewController:picker animated:YES];
 
	bar.topItem.title = @"Email Wallpaper";
 
	[picker release]; // Can safely release the controller now.
}

4.点击发送邮件的按钮处理函数

- (IBAction)mailTapped:(id)sender {
 
    CCScene * scene = [[CCDirector sharedDirector] runningScene];
    HelloWorldLayer *layer = [scene.children objectAtIndex:0];
    UIImage *curImage = layer.curImage;
    NSData *data = UIImageJPEGRepresentation(curImage, 0.8); 
 
    [self mailData:data];
 
}

5.MFMailComposeViewControllerDelegate方法，当邮件发送完毕后调用，隐藏邮件界面

- (void)mailComposeController:(MFMailComposeViewController *)controller
		  didFinishWithResult:(MFMailComposeResult)result
						error:(NSError *)error {
    [self dismissModalViewControllerAnimated:YES];
}

6.如果附件太大，可以用MBProgressHUD开源类库添加等待界面

// Add to top of file
#import "MBProgressHUD.h"
 
// Replace mailTapped method with the following
- (IBAction)mailTapped:(id)sender {
 
    MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];
    hud.labelText = @"Preparing wallpaper...";
 
    CCScene * scene = [[CCDirector sharedDirector] runningScene];
    HelloWorldLayer *layer = [scene.children objectAtIndex:0];
    UIImage *curImage = layer.curImage;
 
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void) {        
        NSData *data = UIImageJPEGRepresentation(curImage, 0.8); 
        dispatch_async(dispatch_get_main_queue(), ^(void) {
            [MBProgressHUD hideHUDForView:self.view animated:YES];
            [self mailData:data];
        });
    });
 
}