Question

在我的应用程序中，我在UIScrollView中使用了UIImageView，我使用了代码。

- (void)viewDidLoad 

{

scrollV.contentSize = CGSizeMake(imageView.frame.size.width, imageView.frame.size.height);

  [super viewDidLoad];

}

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

{

    return imageView;
}

代码工作正常但是当我将UIButton放在scrollView的imageView上并且在我缩放scrollV之后，imageView完全根据scrollView缩放而不是UIButton而不是缩放。

我希望当我缩放图像视图时，我放在imageView上的按钮也可以相对于缩放的imageView进行缩放。

Answer 1

将代理UIView实例创建为scrollview的子视图，并将要放大的所有UI元素放入其中。然后从viewForZoomingInScrollView方法

返回该视图

Answer 2

    CGSize imageView = [photo size];
    UIScrollView *scrollView = (UIScrollView *)[self view];
    [scrollView setDelegate:self];
    [scrollView setContentSize:photoSize];
    [scrollView setBackgroundColor:[UIColor blackColor]];
    [scrollView setShowsHorizontalScrollIndicator:NO];
    [scrollView setShowsVerticalScrollIndicator:NO];

    // Create the image view.
    imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0.0, 0.0, photoSize.width, photoSize.height)];
    [imageView setImage:photo];
    [scrollView addSubview:imageView];

    // Configure zooming.
    CGSize screenSize = [[UIScreen mainScreen] bounds].size;
    CGFloat widthRatio = screenSize.width / photoSize.width;
    CGFloat heightRatio = screenSize.height / photoSize.height;
    CGFloat initialZoom = (widthRatio > heightRatio) ? heightRatio : widthRatio;
    [scrollView setMaximumZoomScale:3.0];
    [scrollView setMinimumZoomScale:initialZoom];
    [scrollView setZoomScale:initialZoom];
    [scrollView setBouncesZoom:YES];

    // Center the photo.
    CGFloat topInset = (screenSize.height - photoSize.height * initialZoom) / 2.0;
    if (topInset > 0.0)
    {
        [scrollView setContentInset:UIEdgeInsetsMake(topInset - 44.0, 0.0, 0.0, 0.0)];
    }
}

#pragma mark -
#pragma mark UIScrollViewDelegate

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{
    return imageView;
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
    CGSize screenSize = [[UIScreen mainScreen] bounds].size;
    CGSize photoSize = [photo size];
    CGFloat topInset = (screenSize.height - photoSize.height * [scrollView zoomScale]) / 2.0;
    if (topInset < 0.0)
    {
        topInset = 0.0;
    }

    [scrollView setContentInset:UIEdgeInsetsMake(topInset, 0.0, -topInset, 0.0)];
}

Answer 3

我成功找到了上述问题的解决方案。我为此写了，

- (void)viewDidLoad 

{

    bgViewOfImage.contentStretch = CGRectMake(ImageView.frame.origin.x, ImageView.frame.origin.y, ImageView.frame.size.width, ImageView.frame.size.height);
    scrollV.contentSize = CGSizeMake(bgViewOfImage.frame.size.width, bgViewOfImage.frame.size.height);
    [super viewDidLoad];
}


- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

{

    return bgViewOfImage;
}

我创建了一个在主视图上插入UIView的层次结构，然后在其上拖动其他控件，如UIImageview和UIButtons。现在它完美地工作并缩放每个控件。

缩放UIScrollView有问题吗？

3 个答案: