Question

我试图在swift中构建collectionView，我希望当设备处于纵向状态时collectionView垂直滚动，而当我以横向模式旋转设备时{{1}水平滚动。这是collectionView类：

CollectionView

要更改滚动方向，我需要更改class SceneBuilderVC: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource{ @IBOutlet var collection: UICollectionView! override func viewDidLoad() { super.viewDidLoad() } override func shouldAutorotate() -> Bool{ return true } override func supportedInterfaceOrientations() -> Int{ return Int(UIInterfaceOrientationMask.All.toRaw()) } func numberOfSectionsInCollectionView(collectionView: UICollectionView!) -> Int { return 1; } func collectionView(collectionView: UICollectionView!, numberOfItemsInSection section: Int) -> Int { return 50; } func collectionView(collectionView: UICollectionView!, cellForItemAtIndexPath indexPath: NSIndexPath!) -> UICollectionViewCell!{ var cell:UICollectionViewCell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as UICollectionViewCell cell.backgroundColor = UIColor.redColor() return cell } }布局。

collectionView

此外，对于iOS8，Apple使用 var flowLayout:UICollectionViewFlowLayout = UICollectionViewFlowLayout() var scrollDirection = UICollectionViewScrollDirection.Vertical flowLayout.scrollDirection = scrollDirection self.collection.collectionViewLayout = flowLayout

更改屏幕旋转方法 willRotateToInterfaceOrientation:duration

如何使用** viewWillTransitionToSize:withTransitionCoordinator *方法检查设备何时旋转，从而改变滚动方向？

Answer 1

使用animateAlongsideTransition中的完成处理程序检查旋转后的方向并进行任何调整。

override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransitionToSize(size, withTransitionCoordinator: coordinator)
    coordinator.animateAlongsideTransition(nil, completion: {context in
        if(UIDevice.currentDevice().orientation == UIDeviceOrientation.Portrait || UIDevice.currentDevice().orientation == UIDeviceOrientation.PortraitUpsideDown){
            //this is portrait (or upsidedown), do something
        }else{
            //landscape 
        }
    })
}

但除非在特殊情况下，您不应该非常关心设备的确切方向，您只需将视图调整为＆＃34;新尺寸＆＃34;

Answer 2

选项＃1：

如果您的收藏视图占据整个屏幕，那么您只需检查宽度是否超过高度，并将结果视为横向。

选项＃2：

或者您可以使用功能：

UIInterfaceOrientationIsLandscape(self.interfaceOrientation)

但是你应该知道在iOS8中已经弃用了interfaceOrientation属性。

Answer 3

这是完整的功能：

override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator   coordinator: UIViewControllerTransitionCoordinator!){
    if let theAppDelegate = UIApplication.sharedApplication() {
        let orientation = theAppDelegate.statusBarOrientation
        if orientation.isPortrait {
            println("Landscape")
            var flowLayout:UICollectionViewFlowLayout = UICollectionViewFlowLayout()
            //flowLayout.sectionInset = UIEdgeInsetsMake(5, 5, 5, 5);
            //flowLayout.itemSize = CGSizeMake(80, 80)
            var scrollDirection = UICollectionViewScrollDirection.Horizontal
            flowLayout.scrollDirection = scrollDirection
            self.collection.collectionViewLayout = flowLayout
        }else{
            println("Protrait")
            var flowLayout:UICollectionViewFlowLayout = UICollectionViewFlowLayout()
            // flowLayout.sectionInset = UIEdgeInsetsMake(5, 5, 5, 5);
            //flowLayout.itemSize = CGSizeMake(80, 80)
            var scrollDirection = UICollectionViewScrollDirection.Vertical
            flowLayout.scrollDirection = scrollDirection
            self.collection.collectionViewLayout = flowLayout
        }
    }
}

在swift中旋转UICollectionView时水平滚动

3 个答案: