Question

在Code中创建UICollectionView时遇到问题，与在Storyboard中创建View相比。在以编程方式创建的视图中，我无法更改焦点，因为它在故事板版本中按预期工作。

这是我创建UICollectionView

的方法

class ChannelGridViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {


override func viewDidLoad() {
    super.viewDidLoad()
    self.setup()
}

func setup() {
    let layout : UICollectionViewFlowLayout = UICollectionViewFlowLayout()
    layout.sectionInset = UIEdgeInsets(top: 50, left: 50, bottom: 50, right: 50)
    layout.itemSize = CGSize(width: 350, height: 225)

    let grid = UICollectionView(frame: self.view.frame, collectionViewLayout: layout)
    grid.dataSource = self
    grid.delegate = self
    grid.userInteractionEnabled = true
    grid.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: "cell")
    self.view.addSubview(grid)

}

设置方法是我添加到编程部分的唯一附加方法。

其余方法如下：

func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 3
}

func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
    return 1
}

func collectionView(collectionView: UICollectionView, canFocusItemAtIndexPath indexPath: NSIndexPath) -> Bool {
    return true
}

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath)
    cell.backgroundColor = .greenColor()
    cell.userInteractionEnabled = true
    cell.clipsToBounds = false
    return cell
}

func collectionView(collectionView: UICollectionView, shouldUpdateFocusInContext context: UICollectionViewFocusUpdateContext) -> Bool {
    return true
}

override func didUpdateFocusInContext(context: UIFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
    if (context.nextFocusedView != nil) {
        coordinator.addCoordinatedAnimations({() -> Void in
            context.nextFocusedView!.transform = CGAffineTransformMakeScale(1.05, 1.05)
            }, completion: { _ in })
    }
    if (context.previouslyFocusedView != nil) {
        coordinator.addCoordinatedAnimations({() -> Void in
            context.previouslyFocusedView!.transform = CGAffineTransformMakeScale(1.0, 1.0)
            }, completion: { _ in })
    }
}

我希望你们可以帮助我，因为经过长时间的谷歌搜索和堆栈溢出之后我无法找到问题。 99％的教程都是关于故事板的。

非常感谢，亚历

在以编程方式创建View时，tvOS UICollectionView无法更改焦点

0 个答案: