相关疑难解决方法(0)

我有一个UIImageView内部UIScrollView用于缩放和滚动.如果滚动视图的图像/内容大于滚动视图,则一切正常.但是,当图像变得小于滚动视图时,它会粘在滚动视图的左上角.我想让它保持中心,就像照片应用程序一样.

任何关于在UIScrollView较小时保持居中内容的想法或例子？

我正在使用iPhone 3.0.

以下代码几乎可以使用.如果在达到最小缩放级别后将其捏住,图像将返回到左上角.

- (void)loadView {
    [super loadView];

    // set up main scroll view
    imageScrollView = [[UIScrollView alloc] initWithFrame:[[self view] bounds]];
    [imageScrollView setBackgroundColor:[UIColor blackColor]];
    [imageScrollView setDelegate:self];
    [imageScrollView setBouncesZoom:YES];
    [[self view] addSubview:imageScrollView];

    UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"WeCanDoIt.png"]];
    [imageView setTag:ZOOM_VIEW_TAG];
    [imageScrollView setContentSize:[imageView frame].size];
    [imageScrollView addSubview:imageView];

    CGSize imageSize = imageView.image.size;
    [imageView release];

    CGSize maxSize = imageScrollView.frame.size;
    CGFloat widthRatio = maxSize.width / imageSize.width;
    CGFloat heightRatio = maxSize.height / imageSize.height;
    CGFloat initialZoom = (widthRatio > …