UICollectionFlowLayOut

最新推荐文章于 2019-06-06 14:38:55 发布

原创最新推荐文章于 2019-06-06 14:38:55 发布 · 282 阅读

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CC 4.0 BY-SA版权

本文介绍了一种自定义的UICollectionViewFlowLayout，支持长按拖动Cell交换位置，同时支持水平和垂直滚动。此外，还实现了将Cell拖动到自定义的附加View上以选择复制或删除的功能。

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1.自定义UICollectionFlowLayOut 支持长按拖动Cell 交换位置支持水平和垂直两个方位的滚动 2.支持拖动Cell 到自定义附加的View 来选择时复制Cell 还是删除Cell 附加的View可以自己定义在相应的代理中实现即可 2.Demo中用使用的例子，可以根据自己的需求变化

class ViewController: UIViewController {

var collectionView: UICollectionView!
/**
 * 这个View 自己根据需求 自定义
 */
fileprivate var deleteView: DQDeleteView?

public var mediaArray:NSMutableArray = []

override func viewDidLoad() {
    super.viewDidLoad()
    let flowLayout:DQCollectionViewFlowLayout = DQCollectionViewFlowLayout.init()
    collectionView = UICollectionView.init(frame: CGRect.init(x: 0, y: 300, width: kScreenW, height: 60), collectionViewLayout: flowLayout)
    collectionView.alwaysBounceHorizontal = true
    flowLayout.itemSize = CGSize.init(width: 60, height: 60)
    flowLayout.scrollDirection  = UICollectionViewScrollDirection.horizontal;
    flowLayout.minimumLineSpacing  = 10;
    flowLayout.minimumInteritemSpacing  = 10;
    flowLayout.sectionInset  = UIEdgeInsetsMake(0, 8, 0, 8);
    
    flowLayout.scrollingNeedToZoomCell = true //是否需要滚动的时候 缩放Cell
    flowLayout.zoomScale = 1.5   //缩放的比例
    
    
    //let inset = (kScreenW - 60) * 0.5
    //flowLayout.sectionInset = UIEdgeInsetsMake(0, inset, 0, inset)
    
    collectionView.register(DQContainerCell.self, forCellWithReuseIdentifier: "DQContainerCell")
    collectionView.delegate = self
    collectionView.dataSource = self
    collectionView.showsHorizontalScrollIndicator = false
    collectionView.collectionViewLayout = flowLayout
    self.view.addSubview(collectionView)
    
    初始化数据源
    for i in 1..<8 {
        let str = Bundle.main.path(forResource: "\(i)", ofType: "jpg")
        self.mediaArray.add(str!)
    }
    self.collectionView.reloadData()
    
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}
extension ViewController:UICollectionViewDelegate,UICollectionViewDataSource{

func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int{
    return mediaArray.count
}

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    let cell  = collectionView.dequeueReusableCell(withReuseIdentifier: "DQContainerCell", for: indexPath) as!DQContainerCell
    cell.imageView.image = UIImage.init(contentsOfFile: mediaArray[indexPath.row] as! String)
    return cell
}

//MARK :SCCollectionViewFlowLayout Delegate DViewataSource
 //实现支持 拖动Cell 显示删除或者复制View  
  // 显示附加的Cell
@objc func didDisPlayAdditionalEditView(){
    if self.deleteView == nil {
        deleteView = DQDeleteView()
        deleteView!.frame = CGRect.init(x: 0, y: self.collectionView.frame.origin.y - 60, width: kScreenW, height: 60)
        deleteView!.isHidden = true
        self.view.addSubview(deleteView!)
    }
    self.deleteView?.isHidden = false
}
 // 拖动Cell 过程可以实时判断 Cell位置  本人Demo中 用来显示删除的虚框
@objc func draggingViewMoving(_ dragView: UIView?){
    guard self.deleteView != nil else {
        return
    }
    let tempFrame = self.view.convert(self.deleteView!.frame, to: UIApplication.shared.keyWindow!)
    if tempFrame.contains(CGPoint.init(x: kScreenW/2, y: dragView!.center.y)) {
        deleteView!.drawDashLine = true
    }else{
        deleteView!.drawDashLine = false
    }
}
// 拖动Cell 过程可以判断Cell 是否要删除
@objc func draggingViewIsInDeleteEditView(_ dragView: UIView?)->Bool{
    guard dragView != nil && self.deleteView != nil  else {
        return false
    }
    let tempFrame = self.view.convert(self.deleteView!.frame, to: UIApplication.shared.keyWindow!)
    if tempFrame.contains(CGPoint.init(x: kScreenW/2, y: dragView!.center.y)) {
        return true
    }else{
        return false
    }
}
 // 拖动Cell 过程可以判断Cell 是否要复制
@objc func draggingViewIsInDuplicationEditView(_ dragView: UIView?)->Bool{
    return false
}

 // 结束显示附加的 DeleteView
@objc func didDisAppearAdditionalEditView(){
    self.deleteView?.isHidden = true
}
// 交换Cell位置
@objc func collectionView(_ collectionView: UICollectionView, itemAtIndexPath fromIndexPath: IndexPath, willMoveToIndexPath toIndexPath: IndexPath){
    mediaArray.exchangeObject(at: toIndexPath.row, withObjectAt: fromIndexPath.row)
}

//是否可以 移动Cell的位置
@objc func collectionView(_ collectionView: UICollectionView, itemAtIndexPathCanMove indexPath: IndexPath) -> Bool{
    return true
}
//判断两个Cell是否可以 交换位置
@objc func collectionView(_ collectionView: UICollectionView, itemAtIndexPath fromIndexPath: IndexPath, canMoveToIndexPath toIndexPath: IndexPath) -> Bool{
    if labs(fromIndexPath.row - toIndexPath.row) > 1{
        return false
    }
    return true
}
//删除Cell
@objc func collectionView(_ collectionView: UICollectionView, itemAtIndexPathDidDelete indexPath: IndexPath){
  
    mediaArray.removeObject(at: indexPath.row)
    collectionView.deleteItems(at: [indexPath])
}

//  实现复制功能的代理
@objc func collectionView(_ collectionView: UICollectionView, itemAtIndexPathDidDuplicate indexPath: IndexPath) {
    

}

Demo 下载地址 https://github.com/qiaodai/CollectionLayOut.git