如何在按鈕上滾動（水平）集合視圖？

Question

我有一個與圖像集合視圖。我想執行按鈕按下滾動。我已經搜索谷歌我發現只設置contentoffset，但我想滾動動畫（滾動應該反彈，如果內容是通過滾動區域）。我已經添加image告訴你我到底要做什麼，在那裏圖片是一個集合視圖，兩側的小箭頭都是按鈕。

@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

請檢查該代碼，我修改代碼：

@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) 

}