這里的相冊功能是基于 UIcollection 實現(xiàn)的,相比于基于 UIScrollview 來實現(xiàn),這種實現(xiàn)方式會節(jié)約更多資源,也會避免出現(xiàn)由于內(nèi)存劇增導致的閃退問題.效果如圖所示:

相冊功能

其次,你需要定制一個盛放 collectionView 的 collectionViewCell.

class CollCollectionViewCell: UICollectionViewCell,UICollectionViewDelegate,UICollectionViewDataSource {
  var clickBlock:((selNum:Int)->())?  //回調(diào)
  var imageUrlArr:[String] = []{
    didSet{
      collectionView.reloadData()
    }
  }
  var collectionView:UICollectionView!
  
  override init(frame: CGRect) {
    super.init(frame: frame)
    self.setUp()
  }
  override func awakeFromNib() {
    super.awakeFromNib()
    self.setUp()
  }
  required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }
  func setUp() {
    collectionView = self.createCollectionView(0, itemSize:CGSizeMake((SCREEN_WIDTH-40)/3.0, (SCREEN_WIDTH-40)/3.0), sectionInset: UIEdgeInsetsMake(10, 10, 10, 10), direction: .Vertical)
    collectionView.delegate = self
    collectionView.dataSource = self
    self.addSubview(collectionView)
    //注冊 cell
    collectionView.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: "CollectionCell")
  }
  // MARK: - UICollectionViewDelegate
  func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return imageUrlArr.count
  }
  func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("CollectionCell", forIndexPath: indexPath)
    cell.backgroundColor = UIColor.init(white: 0.8, alpha: 1)
    let cellSide = cell.frame.size.width
    //壓縮并裁剪圖片
    let newImage = UIImage.compressAndCutImage( UIImage.init(named: "tips"), size: CGSizeMake(cellSide, cellSide))
    if let newImage = newImage {
      let imageV = UIImageView.init(image: newImage)
      cell.addSubview(imageV)
    }
    return cell
  }
  func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    if let clickBlock = clickBlock {
      clickBlock(selNum: indexPath.row)
    }
  }
}

同時,你需要一個實現(xiàn)圖片瀏覽功能的控件.其實也就是 cell的點擊事件,傳送門: 圖片瀏覽視圖

從而,你便可以在以上三條的基礎上基于 UICollection View 實現(xiàn)相冊功能,詳見代碼:

class PhotoGalleryView: UIView ,UICollectionViewDelegate,UICollectionViewDataSource,UIScrollViewDelegate{
  
  var allDataArray:[[String]] = []
  var clickCellBlock:((selNum:Int,urlArr:[String])->())?
  
  var topScrollView:ScrollBtnsView!
  var bottomScrollView:UICollectionView!
  var curPage:Int = 0
  
  // MARK: - system method
  override init(frame: CGRect) {
    super.init(frame: frame)
    self.setUp()
  }
  override func awakeFromNib() {
    super.awakeFromNib()
    self.setUp()
  }
  required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }
  // MARK: private method
  func setUp() {
    //添加相冊頂部滾動圖
    topScrollView = ScrollBtnsView.init(frame: CGRectMake(0, 0, SCREEN_WIDTH, 50))
    self.addSubview(topScrollView)
    bottomScrollView = self.createCollectionView(50, itemSize:CGSizeMake(SCREEN_WIDTH, self.frame.height-50), sectionInset: UIEdgeInsetsZero , direction: .Horizontal)
    bottomScrollView.delegate = self
    bottomScrollView.dataSource = self
    bottomScrollView.pagingEnabled = true
    self.addSubview(bottomScrollView)
    //注冊 cell
    bottomScrollView.registerClass(CollCollectionViewCell.self, forCellWithReuseIdentifier: "CollCollectionViewCell")
  }
  // MARK: public method
  func conPhotoGalleryView(titleArr:[String],imageUrlsArr:[[String]]) {
    topScrollView.configBtnScrollView(titleArr) { (tag) in
      self.bottomScrollView.contentOffset = CGPointMake(CGFloat(tag)*SCREEN_WIDTH, 0)
    }
    allDataArray = imageUrlsArr
  }
  // MARK: - UICollectionViewDelegate
  func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return allDataArray.count
  }
  func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell:CollCollectionViewCell = collectionView.dequeueReusableCellWithReuseIdentifier("CollCollectionViewCell", forIndexPath: indexPath) as! CollCollectionViewCell
    let images = allDataArray[indexPath.row]
    cell.imageUrlArr = images
    cell.clickBlock = { (selNum:Int) in
      if let  clickCellBlock = self.clickCellBlock{
        clickCellBlock(selNum:selNum,urlArr: images)
      }
    }
    return cell
  }
  // MARK: - UIScrollViewDelegate
  func scrollViewDidEndDecelerating(scrollView: UIScrollView) {
    let offSetFlag = Int(scrollView.contentOffset.x/SCREEN_WIDTH)
    topScrollView.upDataOldAndNewBtn(offSetFlag)
  }
}

當你完成了相冊這個控件之后,使用起來便是極其簡單的.

    //創(chuàng)建圖片瀏覽視圖
    let images = BigImageView.init(frame: CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT))
    UIApplication.sharedApplication().keyWindow?.addSubview(images)
    images.downloadSucBlock = {
      print("保存圖片成功")
    }
    images.downloadFailBlock = {
      print("保存圖片失敗")
    }
    
    //創(chuàng)建相冊
    let photoGalleryView = PhotoGalleryView.init(frame: CGRectMake(0, 64, SCREEN_WIDTH, self.view.frame.size.height))
    self.view.addSubview(photoGalleryView)
    photoGalleryView.clickCellBlock = {(selNum:Int,urlArr:[String]) in
      images.showBigImageView(urlArr, selCount: selNum)
    }
    photoGalleryView.conPhotoGalleryView(["相冊1相冊1相冊1","2","相冊三","相冊4相冊4"], imageUrlsArr: [["","","","","","","",""],["","","","",""],["","","","","","","","","","","","","","",""],["",""]])

期待你的評論建議O(∩_∩)O~