如何获得有效的UIEdgeInsetsMake？

Question

我已经通过storyBoard创建了集合视图单元格，对于4英寸和5英寸屏幕，我已经将UIEdgeInsetsMake设置为编程，如果设备不是4和5，那么我的故事板UIEdgeInsetsMake必须为此设置。

怎么做？

这是我的代码

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView
                        layout:(UICollectionViewLayout*)collectionViewLayout
        insetForSectionAtIndex:(NSInteger)section {
    CGRect screenBound = [[UIScreen mainScreen] bounds];
    CGSize screenSize = screenBound.size;
    CGFloat screenWidth = screenSize.width;
    UIEdgeInsets insets= UIEdgeInsetsMake(?,?,?,?);//how to get the current edge insets.
    if(screenWidth==320)
    {
        UIEdgeInsets insets = UIEdgeInsetsMake(0,12,20,2);
        return insets;
    }
        return insets;
}

Answer 1

您正在寻找contentInset财产。

此外，您还在代码中重新声明变量insets。为简单起见，请考虑更改为以下内容：

- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView
                    layout:(UICollectionViewLayout*)collectionViewLayout
    insetForSectionAtIndex:(NSInteger)section {

    if([UIScreen mainScreen].bounds.size.width == 320)
    {
        return UIEdgeInsetsMake(0,12,20,2);
    }

    return collectionView.contentInset;

}