#import "ViewController.h"     @interface ViewController ()     @end     @implementation ViewController     - (void)viewDidLoad {      [super viewDidLoad];      NSLog(@"%@",NSHomeDirectory());      UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];      button.frame = CGRectMake(100, 100, 40, 30);      [button setTitle:@"发送" forState:UIControlStateNormal];      [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];      button.backgroundColor=[UIColor redColor];      [self.view addSubview:button];      [button addTarget:self action:@selector(buttonClick) forControlEvents:UIControlEventTouchUpInside];  }     - (void)buttonClick {            //首先判断当前设备是否可以发送短信      if([MFMessageComposeViewController canSendText])      {          MFMessageComposeViewController *mc=[[MFMessageComposeViewController alloc] init];                     //设置委托          mc.messageComposeDelegate=self;                     //短信内容          mc.body=[[NSString alloc] initWithUTF8String:"你好啊" ];                     //设置短信收件方          mc.recipients=[NSArray arrayWithObject:@"10010"];                     [self presentViewController:mc animated:YES completion:nil];      }else{                 [[[UIAlertView alloc] initWithTitle:nil message:@"抱歉，没有此功能" delegate:self cancelButtonTitle:@"✅"                            otherButtonTitles:nil, nil] show];             }  }         //短信发送的处理结果  -(void)messageComposeViewController:(MFMessageComposeViewController *)controller didFinishWithResult:(MessageComposeResult)result  {      switch (result)      {          case MessageComposeResultSent:              NSLog(@"text message sent successfully");              break;          case MessageComposeResultCancelled:              NSLog(@"text message cancelled");              [self dismissViewControllerAnimated:YES completion:nil];              break;          case MessageComposeResultFailed:              NSLog(@"text message failed");              break;          default:              NSLog(@"error happens");              break;        }         }  @end