在其父视图中垂直和水平居中UIView [英] Center a UIView vertically and horizontally within its parent view

问题描述

我有一个UICollection视图在另一个UIView中。我试图将集合视图置于其父视图中。目前通过调整其框架手动执行此操作（请参阅下面的代码）。必须有一个更简单的方法。

I have a UICollection view that is inside another UIView. I am trying to center the collection view inside its parent view. Currently manually doing it by tweaking its frame (see code below). There has to be a easier way.

当前代码：

self.collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(COLLECTION_PADDING+10, COLLECTION_PADDING+5, self.bounds.size.width - (COLLECTION_PADDING*2), self.bounds.size.height - (COLLECTION_PADDING+22)) collectionViewLayout:flow];

推荐答案

你可以这样做：

self.collectionView.center = CGPointMake(CGRectGetMidX(superview.bounds), CGRectGetMidY(superview.bounds));

Swift 3：

self.collectionView.center = CGPoint(superview.bounds.midX, superview.bounds.midY)

使用这种方法，无论超视图的坐标如何，您的子视图都将以其超视图为中心。使用这样的方法：

With this approach, your subview will be centered in its superview regardless of the superview's coordinates. Using an approach like this:

self.collectionView.center = superview.center

如果superview的原点不是0,0

Will cause problems if the superview has an origin of anything other than 0,0

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