導讀

簡單用Swift寫了一個collectionview的拖拽點擊排序效果;

拖拽排序是新聞類的App可以說是必有的交互設計，如今日頭條，網易新聞等。

效果

主要代碼

手勢長按移動

1.給CollectionViewCell添加一個長按手勢.

private lazy var collectionView: UICollectionView = {

let clv = UICollectionView(frame: self.view.frame, collectionViewLayout: ChannelViewLayout())

clv.backgroundColor = UIColor.white

clv.delegate = self

clv.dataSource = self

clv.register(ChannelViewCell.self, forCellWithReuseIdentifier: ChannelViewCellIdentifier)

clv.register(ChannelHeaderView.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: ChannelViewHeaderIdentifier)

let longPress = UILongPressGestureRecognizer(target: self, action: #selector(longPressGesture(_:)))

clv.addGestureRecognizer(longPress)

return clv

}()

2.開始長按時對cell進行截圖或拷貝一個cell，并隱藏cell.

//MARK: - 長按開始

private func dragBegan(point: CGPoint) {

indexPath = collectionView.indexPathForItem(at: point)

if indexPath == nil || (indexPath?.section)! > 0 || indexPath?.item == 0

{return}

let item = collectionView.cellForItem(at: indexPath!) as? ChannelViewCell

item?.isHidden = true

dragingItem.isHidden = false

dragingItem.frame = (item?.frame)!

dragingItem.text = item!.text

//放大效果(此處可以根據需求隨意修改)

dragingItem.transform = CGAffineTransform(scaleX: 1.1, y: 1.1)

}

3.在手勢移動的時候，找到目標是的indexPatch，再調用系統的api交換這個cell和隱藏cell的位置，并且更新數據.

//MARK: - 移動過程

private func drageChanged(point: CGPoint) {

if indexPath == nil || (indexPath?.section)! > 0 || indexPath?.item == 0 {return}

dragingItem.center = point

targetIndexPath = collectionView.indexPathForItem(at: point)

if targetIndexPath == nil || (targetIndexPath?.section)! > 0 || indexPath == targetIndexPath || targetIndexPath?.item == 0 {return}

// 更新數據

let obj = selectedArr[indexPath!.item]

selectedArr.remove(at: indexPath!.row)

selectedArr.insert(obj, at: targetIndexPath!.item)

//交換位置

collectionView.moveItem(at: indexPath!, to: targetIndexPath!)

//進行記錄

indexPath = targetIndexPath

}

4.手勢停止或取消時，移除view，顯示隱藏cell. (這里手勢取消也要掉用此方法)

//MARK: - 長按結束或取消

private func drageEnded(point: CGPoint) {

if indexPath == nil || (indexPath?.section)! > 0 || indexPath?.item == 0 {return}

let endCell = collectionView.cellForItem(at: indexPath!)

UIView.animate(withDuration: 0.25, animations: {

self.dragingItem.transform = CGAffineTransform.identity

self.dragingItem.center = (endCell?.center)!

}, completion: {

(finish) -> () in

endCell?.isHidden = false

self.dragingItem.isHidden = true

self.indexPath = nil

})

}

點擊移動

collectionView的點擊方法,我這里分為兩段,第一段為點擊處理事件,第二段為點擊添加添加標簽(編輯狀態下第一段可以點擊排序)

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

if indexPath.section > 0 {

// 更新數據

let obj = recommendArr[indexPath.item]

recommendArr.remove(at: indexPath.item)

selectedArr.append(obj)

//移動方法

collectionView.moveItem(at: indexPath, to: NSIndexPath(item: selectedArr.count - 1, section: 0) as IndexPath)

} else {

if isEdite {

if indexPath.item == 0 {return}

// 更新數據

let obj = selectedArr[indexPath.item]

selectedArr.remove(at: indexPath.item)

recommendArr.insert(obj, at: 0)

//移動方法

collectionView.moveItem(at: indexPath, to: NSIndexPath(item: 0, section: 1) as IndexPath)

} else {

if switchoverCallback != nil {

//處理點擊的閉包

switchoverCallback!(selectedArr, recommendArr, indexPath.item)

_ = navigationController?.popViewController(animated: true)

}

}

}

}

其他

此代碼只是一個效果,沒有怎么封裝,如果仔細看過的朋友可以知道其實沒有多么復雜

點擊移動

collectionView.moveItem(at: indexPath, to: NSIndexPath(item: 0, section: 1) as IndexPath)

拖拽移動

collectionView.moveItem(at: indexPath!, to: targetIndexPath!)

主要就是這兩個方法,其他都是處理邏輯以及視圖效果.

提示

如果你們是從iOS9開始適配的話，那么可以用系統的Api，非常簡單好用,大家這里可以自己去試試.

// Support for reordering

@available(iOS 9.0, *)

open func beginInteractiveMovementForItem(at indexPath: IndexPath) -> Bool // returns NO if reordering was prevented from beginning - otherwise YES

@available(iOS 9.0, *)

open func updateInteractiveMovementTargetPosition(_ targetPosition: CGPoint)

@available(iOS 9.0, *)

open func endInteractiveMovement()

@available(iOS 9.0, *)

open func cancelInteractiveMovement()

源碼可以從這里下載

以上所述是小編給大家介紹的Swift下使用UICollectionView 實現長按拖拽功能，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對腳本之家網站的支持！

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