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在uiscrollview内部的uiimageview上的UITapgesturerecognizer

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我有一个问题，我所做的点击手势识别器只适用于滚动视图中的最后一项 .

我有一个图像数组，这些图像被添加到UIImageView中，UIImageView将在以下代码中添加到ScrollView：

UIImageView *imageView1;
for (int i = 0; i < numberOfViews; i++) {
    xOrigin = i * imageSize;
    imageView1 = [[UIImageView alloc] initWithFrame:CGRectMake(xOrigin,50,100,50)];
    [imageView1 setUserInteractionEnabled:YES];
    [imageView1 addGestureRecognizer:tap]; // The gesture I want
    [imageView1 setImage:[images objectAtIndex:i]];
    [scrollView addSubview:imageView1];
}
// Set the contentSize equal to the size of the UIImageView
// scrollView.contentSize = imageView.scrollview.size;
scrollView.contentSize = CGSizeMake(numberOfViews * imageSize, imageSize);


// Finally, add the UIScrollView to the controller's view
[self.view addSubview:scrollView];

上面的代码适用于将图像按顺序添加到滚动视图中，以及将点击添加到列表中的最后一项 . 也就是说，其余的人没有得到轻拍动作？

提前致谢 .

ios iphone objective-c uiscrollview uiimageview

2 回答

  • 2

    因为我可以看到你只有一个点击手势对象，这就是为什么当你运行循环时，它只被添加到最后一个图像视图 .

    您需要为一个图像视图创建一个点击手势对象 .

    UIImageView *imageView1;
for (int i = 0; i < numberOfViews; i++) {
    xOrigin = i * imageSize;
    imageView1 = [[UIImageView alloc] initWithFrame:CGRectMake(xOrigin,50,100,50)];
    [imageView1 setUserInteractionEnabled:YES];
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(imageTapMethod:)];
    [imageView1 addGestureRecognizer:tap]; // The gesture I want
    [imageView1 setImage:[images objectAtIndex:i]];
    [scrollView addSubview:imageView1];
}
// Set the contentSize equal to the size of the UIImageView
// scrollView.contentSize = imageView.scrollview.size;
scrollView.contentSize = CGSizeMake(numberOfViews * imageSize, imageSize);
// Finally, add the UIScrollView to the controller's view
[self.view addSubview:scrollView];
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  • 0

    嗯，这是有道理的，因为您为所有图像视图添加了一个手势识别器 . 将相同的手势识别器添加到第二个视图时，它将从上一个视图中删除 . 您应该向滚动视图添加一个手势识别器，然后根据触摸位置确定点击了哪个图像视图，或者为每个图像视图添加单独的手势识别器 .

    UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:self.view.bounds];
UIGestureRecognizer *tapGestureRecongnizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
[scrollView addGestureRecognizer:tapGestureRecongnizer];


- (void)handleTap:(UIGestureRecognizer *)tapGestureRecognizer
{
    CGPoint location = [tapGestureRecognizer locationInView:self.scrollView];
    for (UIImageView *imageView in self.imageViews) {
        if (CGRectContainsPoint(imageView.frame, location)) {
            // here is the imageView being tapped
        }
    }
}

    另一种方法是使用 UIButton 而不是 UIImageView s，然后你也可以免费获得"highlighted effect" .

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