uicollectionview 删除顶部填充

问题描述

我有一个 UICollectionView，它是整个视图，但它位于视图"内(它不是 UICollectionViewController).向此集合视图添加一个单元格会在情节提要中按以下顺序显示它:

I have a UICollectionView that is the entire view but it lives inside "view" (it is not UICollectionViewController). Adding a cell to this collection view shows it in the following order in storyboard:

这是它在模拟器中的样子:

This is how it looks in the emulator:

我不明白如何摆脱这种看法.集合视图的 Storyboard Size Inspector 中的所有插图都为零.可以肯定的是，我还有以下代码:

I don't understand how to get rid of that view. All the insets are at zero in Storyboard Size Inspector for collection view. Just to be sure, I also have the following code:

override func viewWillLayoutSubviews() {
    let layout = self.collectionViewProducts.collectionViewLayout as! UICollectionViewFlowLayout

    let containerWidth = UIScreen.main.bounds.size.width - 40.0
    let itemWidth = (containerWidth / 3.0)
    let itemHeight = (itemWidth / 0.75) + 30

    layout.sectionInset = UIEdgeInsets(top: 0.0, left: 0.0, bottom: 0.0, right: 0.0)

    layout.itemSize = CGSize(width: itemWidth, height: itemHeight)
}

我怎样才能摆脱顶部填充?

How can I get rid of that top padding?

推荐答案

您可以通过考虑以下方法之一来解决顶部填充问题.

You can fix top padding issue by considering one of the following method.

方法 1:通过从 StoryBoard 正确设置您的 collectionView dimensions 来解决问题的自然方法.

Method 1: Natural way to fix your problem by setting up your collectionView dimensions properly from StoryBoard.

方法二:**更新**

您可以在 viewDidLayoutSubviews 或 viewWillLayoutSubviews

  override func viewDidLayoutSubviews() {
     collectionView.frame = CGRect(x: 0, y: 0, width: view.frame.width, height: view.frame.height)
}

方法 3:您可以从 StoryBoard Attributes Inspector Adjust Scroll View Insets.

方法 4:您可以通过调整 CollectionView contentInset 以编程方式解决此问题.

Method 4: You can fix this issue programatically by adjusting CollectionView contentInset.

collectionView.contentInset = UIEdgeInsets(top: **Any Value**, left: 0, bottom: 0, right: 0)

顶部填充 5 的输出:

顶部填充 44 的输出:

顶部填充 64 的输出:

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