導(dǎo)讀

簡(jiǎn)單用Swift寫(xiě)了一個(gè)collectionview的拖拽點(diǎn)擊排序效果;

拖拽排序是新聞?lì)惖腁pp可以說(shuō)是必有的交互設(shè)計(jì)，如今日頭條，網(wǎng)易新聞等。

GitHub地址：https://github.com/wangliujiayou/Swift-dragLabel 歡迎Star.

效果

主要代碼

手勢(shì)長(zhǎng)按移動(dòng)

1.給CollectionViewCell添加一個(gè)長(zhǎng)按手勢(shì).

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(kāi)始長(zhǎng)按時(shí)對(duì)cell進(jìn)行截圖或拷貝一個(gè)cell，并隱藏cell.

//MARK: - 長(zhǎng)按開(kāi)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(jù)需求隨意修改)

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

}

3.在手勢(shì)移動(dòng)的時(shí)候，找到目標(biāo)是的indexPatch，再調(diào)用系統(tǒng)的api交換這個(gè)cell和隱藏cell的位置，并且更新數(shù)據(jù).

//MARK: - 移動(dòng)過(guò)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(shù)據(jù)

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(jìn)行記錄

indexPath = targetIndexPath

}

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

//MARK: - 長(zhǎng)按結(jié)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(diǎn)擊移動(dòng)

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

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

if indexPath.section > 0 {

// 更新數(shù)據(jù)

let obj = recommendArr[indexPath.item]

recommendArr.remove(at: indexPath.item)

selectedArr.append(obj)

//移動(dòng)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(shù)據(jù)

let obj = selectedArr[indexPath.item]

selectedArr.remove(at: indexPath.item)

recommendArr.insert(obj, at: 0)

//移動(dòng)方法

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

} else {

if switchoverCallback != nil {

//處理點(diǎn)擊的閉包

switchoverCallback!(selectedArr, recommendArr, indexPath.item)

_ = navigationController?.popViewController(animated: true)

}

}

}

}

其他

此代碼只是一個(gè)效果,沒(méi)有怎么封裝,如果仔細(xì)看過(guò)的朋友可以知道其實(shí)沒(méi)有多么復(fù)雜

點(diǎn)擊移動(dòng)

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

拖拽移動(dòng)

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

主要就是這兩個(gè)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(kāi)始適配的話(huà)，那么可以用系統(tǒng)的Api，非常簡(jiǎn)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(shí)現(xiàn)長(zhǎng)按拖拽功能，希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)我們網(wǎng)站的支持！

本文標(biāo)題: Swift下使用UICollectionView 實(shí)現(xiàn)長(zhǎng)按拖拽功能

本文地址: http://www.cppcns.com/ruanjian/swift/182182.html

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