使 UICollectionView 可缩放? [英] Make UICollectionView zoomable?

问题描述

有没有什么方法可以让UICollectionViewzoomable，即当你捏的时候，所有的单元格都可以放大缩小.
我可以通过从 delegate 方法返回 UIScrollView 的唯一 subview 在 UIScrollView 中实现这一点

Is there any method make the UICollectionView zoomable, i.e. when you pinch, all the cells can be zoomed in and out.
I can implement this in UIScrollView by returning the only subview of the UIScrollView from delegate method

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

由于 UICollectionView 是一种 UIScrollView，有没有办法或解决方法来实现它?UICollectionView 是否有一个包含所有单元格的直接子视图?
谢谢

Since UICollectionView is kind of UIScrollView, is there a way or work around to implement this? Does the UICollectionView has one direct subview that contains all cells?
Thanks

推荐答案

我认为您要求的内容类似于 WWDC1012 视频中的内容，标题为 高级集合视图和构建自定义布局(演示从 20:20 开始).

I think what you're asking for looks like what is done in the WWDC1012 video entitled Advanced Collection Views and Building Custom Layouts (demo starts at 20:20).

您基本上必须将 pinchGesture 添加到您 UICollectionView，然后将 pinch 属性 (scale, center) 传递给 UICollectionViewLayout(它是 UICollectionViewFlowLayout 的 subclass)，然后您的布局将执行 zoomtransformations> 在所需的单元格上.

You basically have to add pinchGesture to you UICollectionView, then pass the pinch properties (scale, center) to the UICollectionViewLayout (which is a subclass of UICollectionViewFlowLayout), your layout will then perform the transformations needed to zoom on the desired cell.

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