swift - 自定义 UICollectionViewCell 类 : how to change height in Swift 3

Question

如何在类文件中更改 UICollectionViewCell 的大小？

这是我的代码(或者更确切地说是我的具有相关功能的代码片段):

class FeedCell: UICollectionViewCell {

func resizeToText(text: String) {

    self.backgroundColor = UIColor.black

    UIView.animate(withDuration: 0.15, animations: {

        let oldSize = self.feedTextView.frame.size
        var newSize = estimatedFrameForText(text: text, contentViewWidth: oldSize.width, maxSize: 500, font: self.feedTextView.font!, fontSize: self.feedTextView.font!.pointSize)

        newSize.width = oldSize.width

        self.feedTextView.frame.size = newSize

        let heightDiff = oldSize.height - newSize.height



        self.feedImageView.frame.origin.y -= heightDiff

        self.mainView.frame.size.height -= heightDiff

        // I'm changing the cells size but it doesn't change :(
        self.contentView.frame.size.height -= heightDiff


        let oldSize2 = self.feedTextView.frame.size
        let newSize2 = self.feedTextView.contentSize

        self.feedTextView.frame.size = self.feedTextView.contentSize

        let diff = oldSize2.height - newSize2.height

        self.feedImageView.frame.origin.y -= diff

        self.mainView.frame.size.height -= diff

        // here again!
        self.contentView.frame.size.height -= diff

        self.mainView.dropShadowFeed(scale: true)

    })

}

我也尝试过 self.frame.size.height 但它也不起作用。

我的目标是单元格位于提要中并手动调整其显示的文本的大小。我如何以编程方式执行此操作？

Answer 1

UICollectionViewCell 的框架由下面的委托(delegate)决定:

(CGSize)collectionView:(UICollectionView *)collectionView 
              layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath;

如果你想设置你的 collectionviewcell 的框架，你需要在这个委托(delegate)函数中设置它。另一种选择是使用“动态单元格大小”。