Question

我是tvOS的新手。我在Objective-C中使用XIB文件创建了UICollectionView。我如何关注UICollectionViewCell？

我在单元格中有一个标签和一个图像视图，我想要同时聚焦标签和图像视图。

Answer 1

默认情况下，

UICollectionViewCell不是焦点外观，但您可以自行添加一个。

- (void)didUpdateFocusInContext:(UIFocusUpdateContext *)context withAnimationCoordinator:(UIFocusAnimationCoordinator *)coordinator
{
    if (self.focused)
    {
        // Apply focused appearence,
        // e.g scale both of them using transform or apply background color 
    }
    else
    {
       // Apply normal appearance
    }
}

OR

如果您只是想集中ImageView，请在集合视图单元格获得焦点时进行缩放，您可以在awakeFromNib方法中执行此操作

self.imageView.adjustsImageWhenAncestorFocused = YES;
self.clipToBounds = NO;

Answer 2

app.factory('friendProfileService', ['$http', '$stateParams', function($http) {
  return {
    loadProfile: function(id) {
      return $http.get('/users/'+ id +'json');
    }
  };
}])

Answer 3

将以下方法添加到您的collectionview单元格。它将显示焦点单元格的标题，仅提供完整的焦点外观。

override func awakeFromNib() {
        super.awakeFromNib()

        // These properties are also exposed in Interface Builder.
        imageView.adjustsImageWhenAncestorFocused = true
        imageView.clipsToBounds = false

        title.alpha = 0.0
    }

    // MARK: UICollectionReusableView

    override func prepareForReuse() {
        super.prepareForReuse()

        // Reset the label's alpha value so it's initially hidden.
        title.alpha = 0.0
    }

    // MARK: UIFocusEnvironment

    override func didUpdateFocusInContext(context: UIFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
        /*
         Update the label's alpha value using the `UIFocusAnimationCoordinator`.
         This will ensure all animations run alongside each other when the focus
         changes.
         */
        coordinator.addCoordinatedAnimations({
            if self.focused {
                self.title.alpha = 1.0
            }
            else {
                self.title.alpha = 0.0
            }
            }, completion: nil)
    }

专注于tvOS上的UICollectionViewCells

3 个答案: