iOS开发之保存图片到手机相册

    - (void)viewDidLoad  
    {  
        [super viewDidLoad];  
        // Do any additional setup after loading the view.  
          
        self.imageView = [[UIImageView alloc] initWithFrame:CGRectMake(60, 100, 200, 300)];  
        _imageView.image = [UIImage imageNamed:@"hmt.jpg"];  
        _imageView.userInteractionEnabled = YES;  
        [self.view addSubview:_imageView];  
          
        UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] init];  
        tapGesture.numberOfTapsRequired = 1;  
        tapGesture.numberOfTouchesRequired = 1;  
        [tapGesture addTarget:self action:@selector(tapSaveImageToIphone)];  
        [self.imageView addGestureRecognizer:tapGesture];  
      
    }  
      
    - (void)tapSaveImageToIphone{  
      
        /** 
         *  将图片保存到iPhone本地相册 
         *  UIImage *image            图片对象 
         *  id completionTarget       响应方法对象 
         *  SEL completionSelector    方法 
         *  void *contextInfo 
         */  
        UIImageWriteToSavedPhotosAlbum(self.imageView.image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);  
          
    }  
      
    - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(voidvoid *)contextInfo{  
      
        if (error == nil) {  
          
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"已存入手机相册" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil nil];  
            [alert show];  
              
        }else{  
          
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"保存失败" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil nil];  
            [alert show];  
        }  
          
    }  

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