iOS显示相薄

显示手机中的相薄列表我自己封装了一个，Mark一下便于以后用。我的这个是Swift版本的，OC版本的移步官方例子

效果如图


import UIKit
import AssetsLibrary

class AlbumTableView:UITableView,UITableViewDelegate,UITableViewDataSource{
    
    var assetsLibrary:ALAssetsLibrary?
    var groups:NSMutableArray?
    
    typealias ClickCallback = (assetsGroup:ALAssetsGroup?)->Void
    var callback:ClickCallback?
    
    static let rowHeight: CGFloat = 88
    let mPhotoAlbumCellId = "mPhotoAlbumCellId"
    
    init() {
        super.init(frame: CGRect(x: 0, y: Margin.barHeight, width: Margin.screenW, height: Margin.screenH),style: .Plain)
        setupUI()
    }
    
    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)!
    }
    
    func setupUI(){
        assetsLibrary = ALAssetsLibrary.init()
        groups = NSMutableArray()
        
        let groupTypes = ALAssetsGroupAlbum | ALAssetsGroupEvent | ALAssetsGroupFaces | ALAssetsGroupSavedPhotos
        
        self.assetsLibrary?.enumerateGroupsWithTypes(groupTypes, usingBlock: { (group:ALAssetsGroup!, stop:UnsafeMutablePointer) in
            if group != nil{
                let onlyPhotosFilter = ALAssetsFilter.allPhotos()
                group.setAssetsFilter(onlyPhotosFilter)
                if group.numberOfAssets()>0 {
                    self.groups?.addObject(group)
                    //self.reloadData()
                }
                else{
                    self.performSelectorOnMainThread(#selector(self.reloadData), withObject: nil, waitUntilDone: false)
                }
            }
            }, failureBlock: { (err:NSError!) in
        })
        self.delegate = self
        self.dataSource = self
    }
    
    //MARK:TableView
    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }
    
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return self.groups?.count ?? 0
    }
    
    func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
        return AlbumTableView.rowHeight
    }
    
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let i = groups![indexPath.row] as! ALAssetsGroup
        let cell = PhotoAlbumCell.init(style: .Default, reuseIdentifier: mPhotoAlbumCellId)
        let posterImage = UIImage(CGImage: i.posterImage().takeUnretainedValue())
        cell.previewIv.image = posterImage
        cell.titleLabel.text = i.valueForProperty(ALAssetsGroupPropertyName) as? String
        cell.subTitleLabel.text = "\(i.numberOfAssets())"
        return cell
    }
    
    func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        if let a = self.indexPathForSelectedRow {
            self.deselectRowAtIndexPath(a, animated: false)
        }
        if let c = callback{
            c(assetsGroup: self.groups![indexPath.row] as? ALAssetsGroup)
        }
    }

}