阿权的书房

    if (![MFMailComposeViewController canSendMail]) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"请配置邮件"
                                                        message:@"你的设备不支持发邮件，需要你配置你的设备"
                                                       delegate:self
                                              cancelButtonTitle:@"好"
                                              otherButtonTitles:nil,nil];
        [alert show];
        return;
    }