iphone - 最后一个 imageView 点击了 UIScrollView

Question

我使用以下代码将大约 29 个图像添加到 UIScrollView。

- (void)setupHorizontalScrollView
{
 _scrollViewEffects.delegate = self;

[_scrollViewEffects setCanCancelContentTouches:NO];

_scrollViewEffects.clipsToBounds = NO;
_scrollViewEffects.scrollEnabled = YES;
_scrollViewEffects.pagingEnabled = YES;

NSUInteger nimages = 0;
NSInteger tot=0;
CGFloat cx = 0;
for (; ; nimages++) {
    NSString *imageName = [NSString stringWithFormat:@"e%d.png", nimages];
    UIImage *imageThumb = [UIImage imageNamed:imageName];

    [imageView setTag:nimages];

    if (tot==29) {
        break;
    }
    if (4==nimages) {
        nimages=0;
    }

    imageView = [[UIImageView alloc] initWithImage:imageThumb];



    UITapGestureRecognizer *singleTap =
    [[UITapGestureRecognizer alloc] initWithTarget:self
                                            action:@selector(handleSingleTap:)];
    singleTap.numberOfTapsRequired = 1;
    [imageView addGestureRecognizer:singleTap];

    CGRect rect = imageView.frame;
    rect.size.height = 50;
    rect.size.width = 50;
    rect.origin.x = cx;
    rect.origin.y = 0;
    imageView.layer.borderColor = [UIColor whiteColor].CGColor;
    imageView.layer.borderWidth = 1;
    imageView.frame = rect;

    [_scrollViewEffects addSubview:imageView];

    cx += imageView.frame.size.width+5;
    tot++;

}

//self.pageControl.numberOfPages = nimages;

[_scrollViewEffects setContentSize:CGSizeMake(cx, [_scrollViewEffects bounds].size.height)];

[imageView setUserInteractionEnabled:YES];



}

- (void)handleSingleTap:(UIGestureRecognizer *)sender
{
    NSLog(@"image tapped!!!");
}

如您所见，UserInteraction 已启用，一切正常，但代码仅检测 UIScrollView 中最后一个图像的点击。怎么了？

Answer 1

移动线

[imageView setUserInteractionEnabled:YES];

进入循环。您设置为仅在循环完成后的最后一张图像上启用用户交互。