如何将 collectionview 单元格扩展到全屏

Question

我正在尝试全屏打印图像 我使用了 UICollectionViewDelegateFlowLayout 我的代码是

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        let itemWidth = collectionView.bounds.width
        let itemHeight = collectionView.bounds.height
        return CGSize(width: itemWidth, height: itemHeight)
    }

但它不会全屏显示内容 space 从顶部和底部

Answer 1

如果您想增加单元格大小以适合您的屏幕，您可以使用此方法。

Objective-C

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
    return CGSizeMake(self.view.frame.size.width, self.view.frame.size.height);
}

Swift

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        //For entire screen size
        let screenSize = UIScreen.main.bounds.size
        return screenSize
        //If you want to fit the size with the size of ViewController use bellow
        let viewControllerSize = self.view.frame.size
        return viewControllerSize

        // Even you can set the cell to uicollectionview size
        let cvRect = collectionView.frame
        return CGSize(width: cvRect.width, height: cvRect.height)


    }