iOS開發之保存圖片到手機相冊

    - (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{  

    /** 
     *  將圖片保存到iPhone本地相冊 
     *  UIImage *image            圖片對象 
     *  id completionTarget       響應方法對象 
     *  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:@"已存入手機相冊" delegate:self cancelButtonTitle:nil otherButtonTitles:@"確定", nil nil];  
        [alert show];  

    }else{  

        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"保存失敗" delegate:self cancelButtonTitle:nil otherButtonTitles:@"確定", nil nil];  
        [alert show];  
    }  

}  </pre>