Question

我有一个带图像的集合视图。我想在按下按钮时执行滚动。我在google上搜索过我发现只设置了contentoffset但是我想用动画滚动（如果内容超过滚动区域，滚动应该会反弹）。我添加了一个image来告诉你我到底要做什么，在图片中有一个集合视图，两侧的小箭头是按钮。

 @IBAction func moveScrollLeft(sender: UIButton) {
    UIView.animateWithDuration(0.2, delay: 0, options: UIViewAnimationOptions.CurveEaseOut, animations: {
        self.imageCollectionView.contentOffset.x -= 50
        }, completion: nil)
    print(imageCollectionView.contentOffset.x)
}

@IBAction func moveScrollRight(sender: UIButton) {
    UIView.animateWithDuration(0.2, delay: 0, options: UIViewAnimationOptions.CurveEaseOut, animations: {
        self.imageCollectionView.contentOffset.x += 50
        }, completion: nil)
    print(imageCollectionView.contentOffset.x)

}

Answer 1

使用UICollectionview的scrollToItemAtIndexPath(_:atScrollPosition:animated:) https://developer.apple.com/library/ios/documentation/UIKit/Reference/UICollectionView_class/#//apple_ref/occ/instm/UICollectionView/scrollToItemAtIndexPath:atScrollPosition:animated：

例如：

let indexPath = NSIndexPath(forRow: 3, inSection: 0)
imageCollectionView.scrollToItemAtIndexPath(indexPath, atScrollPosition: .CenteredHorizontally, animated: true)

Answer 2

请检查此代码我修改了您的代码：

@IBAction func moveScrollLeft(sender: UIButton) {

        self.imageCollectionView.contentOffset.x -= 50

    UIView.animateWithDuration(0.2, delay: 0, options: UIViewAnimationOptions.CurveEaseOut, animations: {
        }, completion: nil)
             self.view.layoutIfNeeded()

    print(imageCollectionView.contentOffset.x)
}

@IBAction func moveScrollRight(sender: UIButton) {

        self.imageCollectionView.contentOffset.x += 50

    UIView.animateWithDuration(0.2, delay: 0, options: UIViewAnimationOptions.CurveEaseOut, animations: {
    self.view.layoutIfNeeded()

        }, completion: nil)

    print(imageCollectionView.contentOffset.x)

}

如何在按钮按下时在集合视图中滚动（水平）？

2 个答案: