代码之家 › 专栏 › 技术社区 › Tirth

UIScrollView的缩放问题?

iphone

Tirth · 技术社区 · 15 年前

- (void)viewDidLoad 

{

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

  [super viewDidLoad];

}

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

{

    return imageView;
}

代码运行良好,但当我将UIButton放在scrollView的imageView上,并在缩放scrollV之后,imageView会根据scrollView完美地缩放,但UIButton不会被缩放。

当我缩放imageview时,我放置在imageview上的按钮也会相对于缩放后的imageview进行缩放。

3 回复 | 直到 15 年前

Vladimir 15 年前

创建一个代理UIView实例作为scrollview的子视图,并将所有要缩放的UI元素放在其中。然后从返回该视图 viewForZoomingInScrollView 方法

poke 14 年前

我成功地找到了解决上述问题的方法。我为此写了一篇文章,

- (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;
}

我创建了一个层次结构,在主视图中插入一个UIView,然后拖动其他控件,比如UIImageview和uibutton,现在它可以完美地工作并缩放每个控件。

poke 14 年前

    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)];
}