如何在UICollectionView中更改滚动方向？

Question

我的故事板iOS应用程序中有一个UICollectionView.当设备处于纵向方向时,我希望它能够垂直滚动,当它在Landscaper中时,我希望它能够水平滚动.

在UICollectionView中,我可以看到scrollEnabled成员,但我看不到设置滚动方向的方法.我错过了什么吗？

Answer 1

UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];

另请注意,prepareForLayout在您的流程布局中调用它似乎没问题...

@interface LayoutHorizontalThings : UICollectionViewFlowLayout
@end

@implementation LayoutHorizontalBooks
-(void)prepareLayout
    {
    [super prepareLayout];

    self.scrollDirection = UICollectionViewScrollDirectionHorizontal;

    self.minimumInteritemSpacing = 0;
    self.minimumLineSpacing = 0;
    self.itemSize = CGSizeMake(110,130);
    self.sectionInset = UIEdgeInsetsMake(0, 0, 0, 0);
    }

Answer 2

设置scrollDirection集合视图的collectionViewLayout.

文件在这里.

Answer 3

你应该试试这个:

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration{

  UICollectionViewFlowLayout *layout = (UICollectionViewFlowLayout *)[self.collectionView collectionViewLayout];

  if ((toInterfaceOrientation == UIInterfaceOrientationLandscapeRight) || (toInterfaceOrientation == UIInterfaceOrientationLandscapeLeft)){
    layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
  }
  else{
    layout.scrollDirection = UICollectionViewScrollDirectionVertical;
  } 
}

在Swift中:

override func willRotateToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) {

    var layout = self.collectionView.collectionViewLayout as! UICollectionViewFlowLayout

    if ((toInterfaceOrientation == UIInterfaceOrientation.LandscapeLeft) || (toInterfaceOrientation == UIInterfaceOrientation.LandscapeRight)){

        layout.scrollDirection = UICollectionViewScrollDirection.Vertical
    }
    else{
       layout.scrollDirection = UICollectionViewScrollDirection.Horizontal
    }

}

Answer 4

斯威夫特4和4.2

if let layout = collectionViewObj.collectionViewLayout as? UICollectionViewFlowLayout {
        layout.scrollDirection = .vertical  // .horizontal
    }

Answer 5

感谢 Mundi 和 Dan Rosenstark 的回答，这是 swift 4.2 版本。

if let flowLayout = collectionView.collectionViewLayout as? UICollectionViewFlowLayout {
    flowLayout.scrollDirection = .horizontal
}