在iOS当中发送电子邮件和短信

iOS实现发送电子邮件的方法很简单，首先导入MessageUI.framework框架，然后代码如下：

 #import "RPViewController.h"
 
 //添加邮件头文件
 #import <MessageUI/MFMailComposeViewController.h>
 
 @interface RPViewController () <MFMailComposeViewControllerDelegate>
 
 @end
 
 @implementation RPViewController
 
 - (void)viewDidLoad
 {
     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.
 }
 
 - (void)didReceiveMemoryWarning
 {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }
 
 - (IBAction)click:(id)sender {
     if ([MFMailComposeViewController canSendMail]) {
         MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
         picker.mailComposeDelegate = self;
 
         //在这里可以设定邮件的默认标题/内容，也可以设置收件人等
         [picker setSubject:@"标题"];
         NSString *emailBody = @"邮件内容";
 
         [picker setMessageBody:emailBody isHTML:NO];
         [self presentViewController:picker animated:YES completion:nil];
 //      [picker release];
     }
     else {
         //无法发送邮件，在这里给用户提示
     }
 }
 
 #pragma mark 邮件代理方法
 - (void)mailComposeController:(MFMailComposeViewController *)controller didFinishWithResult:(MFMailComposeResult)result error:(NSError *)error {
     switch (result) {
         case MFMailComposeResultCancelled:
             //取消发送
             break;
         case MFMailComposeResultSaved:
             //保存草稿
             break;
         case MFMailComposeResultSent:
             //发送成功
             break;
         case MFMailComposeResultFailed:
             //发送失败
             break;
         default:
             break;
     }
 
     [self dismissViewControllerAnimated:YES completion:nil];
 }
 
 @end

首先导入邮件的头文件，之后创建一个发送邮件用的控制器，设置默认参数，然后弹出这个控制器。

令当前控制器充当邮件控制器的代理，这样一来在邮件相关事件执行之后，就能给出一些用户提示了，也要在这里收起邮件视图。

发短信的道理完全一样，只是控制器换成了MFMessageComposeViewController，代理换成了MFMessageComposeViewControllerDelegate，配置代码如下：

     if ([MFMessageComposeViewController canSendText]) {
         MFMessageComposeViewController *message = [[MFMessageComposeViewController alloc] init];
         message.messageComposeDelegate = self;
 
         message.recipients = @[@"电话号码"];
         message.body = @"内容";
 
         [self presentViewController:message animated:YES completion:nil];
     }