可能重复：
使用 CGPoint 跟踪长按手势的确切位置
它总是给NSLog图像按下0。我不明白我做错了什么。它从来没有给我我正在按下的图像的编号。即使当我尝试保存图像时，我点击它总是会保存最后一张图像。
- (void)viewDidLoad
{
UIScrollView *imageScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
imageScrollView.delegate = self;
imageScrollView.pagingEnabled = YES;
for (int i = 0; i < 61; i++) {
CGFloat xOrigin = i * self.view.frame.size.width;
UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];
[myButton addTarget:self action:@selector(dismissView:) forControlEvents:UIControlEventTouchUpInside];
myButton.frame = CGRectMake(xOrigin, 10, 60, 35);
[myButton.layer setMasksToBounds:YES];
[myButton.layer setCornerRadius:10.0f];
myButton.layer.borderWidth = 2;
myButton.layer.borderColor = [[UIColor whiteColor] CGColor];
[myButton setTitle:@"Done" forState:UIControlStateNormal];
myButton.backgroundColor = [UIColor clearColor];
NSString *imageName = [NSString stringWithFormat:@"image%d.png", i];
_image = [UIImage imageNamed:imageName];
_imageView = [[[UIImageView alloc] initWithImage:_image]autorelease];
_imageView.frame = CGRectMake(xOrigin, 0, self.view.frame.size.width, self.view.frame.size.height);
UILongPressGestureRecognizer *gestureRecognizer = [[UILongPressGestureRecognizer alloc]
initWithTarget:self
action:@selector(handleLongPress:)];
imageScrollView.userInteractionEnabled = YES;
[imageScrollView addGestureRecognizer:gestureRecognizer];
gestureRecognizer.delegate = self;
[gestureRecognizer release];
[imageScrollView addSubview:_imageView];
[imageScrollView addSubview:myButton];
}
imageScrollView.contentSize = CGSizeMake(_imageView.frame.size.width * 61 , _imageView.frame.size.height);
[self.view addSubview:imageScrollView];
}
- (void)handleLongPress:(UILongPressGestureRecognizer*)gestureRecognizer{
if (gestureRecognizer.state == UIGestureRecognizerStateBegan){
UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Save Photo", nil];
actionSheet.actionSheetStyle = UIActionSheetStyleBlackTranslucent;
[actionSheet showInView:self.view];
[actionSheet release];
}}
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
switch (buttonIndex) {
case 0:
[self performSelector:@selector(LongPress:) withObject:nil];
break;
default:
break;
}}
- (void)LongPress:(UILongPressGestureRecognizer*)gestureRecognizer{
UIView *view = gestureRecognizer.view;
int index = view.tag;
//UIImageWriteToSavedPhotosAlbum(index, self, @selector(image: didFinishSavingWithError:contextInfo:), nil);
NSLog(@"image pressed %i", index);
}