ios 在 Swift 中获取可见的 IndexPath UICollectionView
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Get Visible IndexPath UICollectionView in Swift
提问by Shangari C
回答by Dari
Have you tried delegate function?
您是否尝试过委托功能？
public func indexPathsForVisibleItems() -> [NSIndexPath]
or
或者
collectionView.indexPathsForVisibleItems()
these must give you what you wanted.
这些必须给你你想要的。
回答by Anbu.Karthik
try this
尝试这个
On delegate
在代表
func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
for cell in yourCollectionViewname.visibleCells() as [UICollectionViewCell] {
let indexPath = yourCollectionViewname.indexPathForCell(cell as UICollectionViewCell)
NSLog("%@", indexPath)
}
}
Choice-2
选择 2
on Button Click
在按钮点击
var point : CGPoint = sender.convertPoint(CGPointZero, toView:yourCollectionViewname)
var indexPath =yourCollectionViewname!.indexPathForItemAtPoint(point)
Get visible All Items
显示所有项目
you can use indexPathsForVisibleRows
您可以使用 indexPathsForVisibleRows
Returns an array of index paths each identifying a visible row in the receiver.
返回索引路径数组，每个索引路径标识接收器中的可见行。
- (NSArray *)indexPathsForVisibleItems;
- (NSArray *)indexPathsForVisibleItems;
var visible: [AnyObject] = yourCollectionViewname.indexPathsForVisibleItems
var indexpath: NSIndexPath = (visible[0] as! NSIndexPath)
回答by Hemang
Swift, safer way to get visible Items:
快速、更安全的获取可见项的方法：
if let indexPaths = self.collectionView.indexPathsForVisibleItems {
//Do something with an indexPaths array.
}
回答by hkg328
This will work fine.
这将正常工作。
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
let visibleIndex = Int(targetContentOffset.pointee.x / collectionView.frame.width)
print(visibleIndex)
}
回答by Ashvini
You can use method of UICollectionView as :
您可以将 UICollectionView 的方法用作：
let indexPath = NSIndexPath(item: value1, section: value2)
