如何以编程方式设置 UICollectionViewCell 宽度和高度 [英] How to set UICollectionViewCell Width and Height programmatically

问题描述

我正在尝试实现一个 CollectionView.当我使用自动布局时，我的单元格不会改变大小，但会改变它们的对齐方式.

现在我宁愿将它们的大小更改为例如

//var size = CGSize(width: self.view.frame.width/10, height: self.view.frame.width/10)

我尝试在我的 CellForItemAtIndexPath

中进行设置

collectionCell.size = 大小

虽然没用.

有没有办法做到这一点?

编辑:

看来，答案只会改变我的 CollectionView 宽度和高度本身.约束可能存在冲突吗?对此有何想法?

解决方案

使用此方法设置自定义单元格高度宽度.

确保添加此协议

UICollectionViewDelegateUICollectionViewDataSourceUICollectionViewDelegateFlowLayout

如果您使用的是 swift 5 或 xcode 11 及更高版本，则需要将 Estimate Size 设置为 none使用故事板以使其正常工作.如果您不设置它，那么下面的代码将无法按预期工作.

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Swift 4 或更高版本

extension YourViewController: UICollectionViewDelegate {//在这里写委托代码}扩展 YourViewController: UICollectionViewDataSource {//这里写数据源代码}扩展 YourViewController: UICollectionViewDelegateFlowLayout {func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) ->CG尺寸{return CGSize(width: screenWidth, height: screenWidth)}}

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目标 C

@interface YourViewController : UIViewController- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{返回 CGSizeMake(CGRectGetWidth(collectionView.frame), (CGRectGetHeight(collectionView.frame)));}

I am trying to implement a CollectionView. When I am using Autolayout, my cells won't change the size, but their alignment.

Now I would rather want to change their sizes to e.g.

//var size = CGSize(width: self.view.frame.width/10, height: self.view.frame.width/10)

I tried setting in my CellForItemAtIndexPath

collectionCell.size = size

it didn't work though.

Is there a way to achieve this?

edit:

It seems, that the answers will only change my CollectionView width and height itself. Is there are conflict in Constraints possible? Any ideas on that ?

解决方案

Use this method to set custom cell height width.

Make sure to add this protocols

UICollectionViewDelegate

UICollectionViewDataSource

UICollectionViewDelegateFlowLayout

If you are using swift 5 or xcode 11 and later you need to set Estimate Size to none using storyboard in order to make it work properly. If you will not set that than below code will not work as expected.

Swift 4 or Later

extension YourViewController: UICollectionViewDelegate {
    //Write Delegate Code Here
}

extension YourViewController: UICollectionViewDataSource {
    //Write DataSource Code Here
}

extension YourViewController: UICollectionViewDelegateFlowLayout {
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: screenWidth, height: screenWidth)
    }
}

Objective-C

@interface YourViewController : UIViewController<UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    return CGSizeMake(CGRectGetWidth(collectionView.frame), (CGRectGetHeight(collectionView.frame)));
}

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