长按图片的保存到相册里面的

 UILongPressGestureRecognizer *longpress=[[UILongPressGestureRecognizeralloc]initWithTarget:selfaction:@selector(saveCacheImage:)];

    longpress.delegate=self;

    longpress.minimumPressDuration = 0.5;

    [imageView addGestureRecognizer:longpress];

图片添加长按的识别

-(void)saveCacheImage:(UILongPressGestureRecognizer *)longpress{

    //手势会响应两次我们取最开始的那一次

    if (longpress.state ==UIGestureRecognizerStateEnded) {

        

       return;

        这里是很容易忘记的加上判断，防止两次响应同一个事件

    } else if (longpress.state ==UIGestureRecognizerStateBegan) {

        

        //我们要做的事情

    

    self.cacheiv=(UIImageView *)longpress.view;

    UIActionSheet *as=[[UIActionSheetalloc]initWithTitle:nildelegate:selfcancelButtonTitle:@"取消"destructiveButtonTitle:nilotherButtonTitles:@"保存这张图片吗",nil];

    [as showInView:self.superview];

    as.tag=3;

    }

    }

//要实现的协议方法

-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex

{

if (buttonIndex==0) {

存到相册的方法很简单；只要给你想存的uiimage对象就行

            UIImageWriteToSavedPhotosAlbum(self.cacheiv.image, self, nil, nil);

        }

}