ios 如何快速滚动到集合视图中的特定索引
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How to scroll to a particluar index in collection view in swift
提问by TechChain
We have a collection view. I have made a calendar which shows dates horizontally & I scroll dates horizontally. Now on screen I see only 3-4 dates. Now I want to auto scroll to a particular selected date when calendar screen I shown.So the date I want to scroll to is not visible yet.
我们有一个集合视图。我制作了一个水平显示日期的日历，并且我水平滚动日期。现在在屏幕上我只看到 3-4 个日期。现在我想在显示日历屏幕时自动滚动到特定的选定日期。所以我想滚动到的日期尚不可见。
For that I got the indexpath for particular cell. Now I am trying to scroll it to particular indexpath.
为此，我获得了特定单元格的索引路径。现在我试图将它滚动到特定的索引路径。
func scrollCollectionView(indexpath:IndexPath)
{
// collectionView.scrollToItem(at: indexpath, at: .left, animated: true)
//collectionView.selectItem(at: indexpath, animated: true, scrollPosition: .left)
collectionView.scrollToItem(at: indexpath, at: .centeredHorizontally, animated: true)
_ = collectionView.dequeueReusableCell(withReuseIdentifier: "DayCell", for: indexpath) as? DayCell
}
Please tell how can I implement it?
请告诉我如何实施它？
回答by PGDev
In viewDidLoadof your controller, you can write the code for scrolling to a particular index path of collection view.
在viewDidLoad您的控制器中，您可以编写用于滚动到集合视图的特定索引路径的代码。
self.collectionView.scrollToItem(at:IndexPath(item: indexNumber, section: sectionNumber), at: .right, animated: false)
回答by Pixel
In Swift 4, this worked for me:
在 Swift 4 中，这对我有用：
override func viewDidLayoutSubviews() {
collectionView.scrollToItem(at:IndexPath(item: 5, section: 0), at: .right, animated: false)
}
placing it anywhere else just resulted in weird visuals.
将它放在其他任何地方只会产生奇怪的视觉效果。
回答by Tigran Torgomyan
You can use this
你可以用这个
self.collectionView.scrollToItem(at:IndexPath(item: index, section: 0), at: .right, animated: false)
回答by Vance Huang
I used your answer @PGDev but I put it in viewWillAppearand it works well for me.
我使用了你的回答@PGDev，但我把它放进去了viewWillAppear，它对我来说效果很好。
self.collectionView?.scrollToItem(at:IndexPath(item: yourIndex, section: yourSection), at: .left, animated: false)
回答by Milan Aghera
In viewDidLoad of your controller, you can write the code
在控制器的 viewDidLoad 中，您可以编写代码
self.myCollectionView.performBatchUpdates(nil) { (isLoded) in
if isLoded{
self.myCollectionView.scrollToItem(at: self.passedContentOffset, at: [.centeredVertically,.centeredHorizontally], animated: false)
}
}
