【学习ios之路:UI系列】实现将图片保存到IOS自带的Photo Album中

 具体功能:

   在一个视图中有一个UIImageView,当长按UIImageView时，将UIImageView中的UIImage所代表的图片保存到PhotoAlbum中。

实现: 代码如下:self.imageView是定义的UIImageView视图属性

//长按效果- (void)longPanGesture {    UILongPressGestureRecognizer *longGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self                                                               </span>action:@selector(longPanGesture:)];    [self.imageView addGestureRecognizer:longGesture];    longGesture.minimumPressDuration = 4;    [longGesture release];}

相应事件:longPanGesture方法实现

- (void)longPanGesture:(UILongPressGestureRecognizer *)longGesture {    if (longGesture.state == UIGestureRecognizerStateBegan) {        UIImageWriteToSavedPhotosAlbum([self.imageView image], nil, nil,nil);        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"存储照片成功"                              message:@"照片已存储于图片库中" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];        [alert show];        [alert release];    }}

UIImageWriteToSavedPhotosAlbum方法

 UIImageWriteToSavedPhotosAlbum是UIKit框架中的一个函数。这里说一下后面三个参数的含义：void UIImageWriteToSavedPhotosAlbum (   UIImage  *image,   id       completionTarget,   SEL      completionSelector,   void     *contextInfo);/**id是target对象*sel是selector.即target对象上的方法名*contextInfo是任意指针，会传递到selector定义的方法上。*一般是当完成后调用方法时使用，或者在完成时出错的处理。*/

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