iOS 邮箱

- (void)openMail {
    NSString *mail = @"support@126.com";
    if ([MFMailComposeViewController canSendMail]) {
        MFMailComposeViewController *mailCompose = [[MFMailComposeViewController alloc] init];
        [mailCompose setToRecipients:@[mail]]; //设置收件人
        mailCompose.mailComposeDelegate = self;
        [self presentViewController:mailCompose animated:YES completion:nil];
    } else {
        // 用户没有设置邮箱账号
        NSString *str = [NSString stringWithFormat:@"mailto:%@", mail];
        NSURL *url = [NSURL URLWithString:[str stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLFragmentAllowedCharacterSet]]];
        if ([[UIApplication sharedApplication] canOpenURL:url]) {
            [[UIApplication sharedApplication] openURL:url options:@{} completionHandler:nil];
        }
    }
}
#pragma mark - MFMailComposeViewControllerDelegate
- (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error {
    [controller dismissViewControllerAnimated:YES completion:nil];
}