一. 內容說明
跟我之前這篇類似，只不過那篇是OC版本，這篇是Swift版本 OC版本鏈接地址
目的：通過kingfisher請求5張圖片，展示出來。然后利用圖片放大縮小管理類展示圖片，多張圖片可以滑動瀏覽
效果圖如下，想看動態的效果圖，請看上面鏈接中的OC版本效果圖，跟這篇是一樣的。
本demo，只加載本地圖片的demo下載鏈接 ，需要加載網絡圖片的，需要下載Kingfisher
二.源碼展示
0. 圖片測試demo源碼
import Foundation import UIKit class LJPhotoGroupViewController : TFBaseViewController{ lazy var ljArray : [LJPhotoInfo] = [LJPhotoInfo]() let ljUrlArray = ["http://pica.nipic.com/2007-12-12/20071212235955316_2.jpg", "http://d.lanrentuku.com/down/png/1706/10avatars-material-pngs/avatars-material-man-4.png", "http://image.nationalgeographic.com.cn/2017/0703/20170703042329843.jpg", "http://image.nationalgeographic.com.cn/2015/0121/20150121033625957.jpg", "http://image.nationalgeographic.com.cn/2017/0702/20170702124619643.jpg"] override func viewDidLoad() { super.viewDidLoad() self.setTopNavBarTitle("圖片瀏覽測試Demo") self.setTopNavBackButton() self.setUI() } } extension LJPhotoGroupViewController{ func setUI(){ for index in 0...4{ //1.加載本地圖片 //let image = UIImage.init(named: "/(index + 1).jpg") let showImageView = UIImageView.init() //showImageView.image = image showImageView.tag = index showImageView.frame = CGRect(x: Int((AppWidth - 200)/2.0), y: 80 + Int(90 * index), width: 200, height: 80) showImageView.isUserInteractionEnabled = true view.addSubview(showImageView) //2.加載本地圖片 let url = URL(string:ljUrlArray[index]) showImageView.kf.setImage(with: url) let gestrue = UITapGestureRecognizer.init(target: self, action: #selector(LJPhotoGroupViewController.showClicked(_:))) showImageView.addGestureRecognizer(gestrue) //需要瀏覽的圖片添加到數組 let info = LJPhotoInfo.init() info.largeImageURLStr = ljUrlArray[index] info.thumbImageview = showImageView info.currentSelectIndex = index self.ljArray.append(info) } } } extension LJPhotoGroupViewController{ func showClicked(_ sender : UITapGestureRecognizer){ if self.ljArray.count > 0 { let index = sender.view?.tag let photoGroupView = LJPhotoGroupView.init(frame: CGRect(x: 0, y: 0, width: AppWidth, height: AppHeight)) photoGroupView.setData(self.ljArray, selectedIndex: index!) photoGroupView.showPhotoView() CHDebugLog("-------/(String(describing: index))") } } } 1. LJPhotoGroupView：圖片瀏覽管理類，用于展示圖片
import Foundation import UIKit class LJPhotoGroupView: UIView { let baseIndex = 1000 var originFrame : CGRect? // 圖片的源尺寸 var currentIndex : NSInteger = 0 //當前選中的圖片index var ljPhotoArray : [Any] = [Any]()//存儲多組需要加載的圖片原始信息 lazy var ljScrollView : UIScrollView = { let view = UIScrollView.init(frame: CGRect(x: 0, y: 0, width: AppWidth, height: AppHeight)) view.delegate = self view.isPagingEnabled = true view.backgroundColor = UIColor.yellow return view }() override init(frame: CGRect) { super.init(frame: frame) self.addSubview(self.ljScrollView) } func setData(_ photoArray : Array<Any>, selectedIndex : NSInteger) { self.ljScrollView.contentSize = CGSize(width: floor(AppWidth) * CGFloat(photoArray.count), height: AppHeight) self.currentIndex = selectedIndex self.ljPhotoArray = photoArray } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } } extension LJPhotoGroupView { // MARK: -- 圖片cell復用 func dequeueReusableCell() -> LJPhotoView { var cell = self.viewWithTag(baseIndex + self.currentIndex) as? LJPhotoView if ljPhotoArray.count > currentIndex { let info = ljPhotoArray[currentIndex] as? LJPhotoInfo let tempImageView = info?.thumbImageview if cell != nil{ self.originFrame = tempImageView?.convert((tempImageView?.bounds)!, to: self) return cell! } cell = LJPhotoView.init(frame: CGRect(x: floor(AppWidth)*CGFloat(currentIndex), y: 0, width: AppWidth, height: AppHeight)) self.originFrame = tempImageView?.convert((tempImageView?.bounds)!, to: self) } return cell! } // MARK: -- 展示圖片 func showPhotoView(){ UIApplication.shared.keyWindow?.rootViewController?.view.addSubview(self) self.backgroundColor = UIColor.black let cell1 = self.dequeueReusableCell() cell1.tag = self.baseIndex + self.currentIndex var ljTempImage : UIImage? if ljPhotoArray.count > currentIndex { let info = ljPhotoArray[currentIndex] as? LJPhotoInfo ljTempImage = info?.thumbImageview?.image } ljTempImage = (ljTempImage != nil) ? ljTempImage : UIImage.init(named: "pic_broadcast_gray_square") let tfImageView = UIImageView.init(image: ljTempImage) tfImageView.frame = self.originFrame ?? CGRect.zero tfImageView.clipsToBounds = true tfImageView.backgroundColor = UIColor.red tfImageView.contentMode = .scaleAspectFit self.addSubview(tfImageView) //添加頁面消失的手勢 let tap = UITapGestureRecognizer.init(target: self, action: #selector(hideImageView)) self.addGestureRecognizer(tap) UIView.animate(withDuration: 0.25, animations: { let y : CGFloat? = (AppHeight - (ljTempImage?.size.height)! * AppWidth / (ljTempImage?.size.width)!)/2.0 let height : CGFloat? = (ljTempImage?.size.height)! * AppWidth / (ljTempImage?.size.width)! tfImageView.frame = CGRect(x: 0, y: y!, width: AppWidth, height: height!) }) { (finish) in //根據選中第幾張圖片直接展示出來 let cell = self.dequeueReusableCell() cell.tag = self.baseIndex + self.currentIndex cell.backgroundColor = UIColor.gray if self.ljPhotoArray.count > self.currentIndex{ cell.setCurrentImageview(self.ljPhotoArray[self.currentIndex] as! LJPhotoInfo) } let x : CGFloat = CGFloat(self.currentIndex) * floor(AppWidth); self.ljScrollView.setContentOffset(CGPoint.init(x: x, y: 0), animated: false) self.ljScrollView.addSubview(cell) tfImageView.removeFromSuperview() } } // MARK: -- 移除圖片 func hideImageView(){ let cell = self.viewWithTag(baseIndex + currentIndex) as? LJPhotoView UIView.animate(withDuration: 0.25, animations: { cell?.ljImageView.frame = self.originFrame! }) { (finish) in self.backgroundColor = UIColor.white self.removeFromSuperview() } } } extension LJPhotoGroupView : UIScrollViewDelegate{ func scrollViewDidScroll(_ scrollView: UIScrollView) { //滑動時，會調用多次 } func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) { //滑動完畢時，只會調用一次 let page = self.ljScrollView.contentOffset.x / self.frame.size.width; self.currentIndex = NSInteger(page); print("scrollViewDidEndDecelerating當前頁數----/(page)") let cell = self.dequeueReusableCell() cell.tag = self.baseIndex + Int(page) if self.ljPhotoArray.count > self.currentIndex{ cell.setCurrentImageview(self.ljPhotoArray[self.currentIndex] as! LJPhotoInfo) } self.ljScrollView.addSubview(cell) } } 2. LJPhotoInfo：圖片信息的model
import Foundation import UIKit class LJPhotoInfo: NSObject { var currentSelectIndex : Int? var largeImageURLStr : String? var thumbImageview : UIImageView? override init() { super.init() } } 3.LJPhotoView：圖片瀏覽管理類用到的cell（圖片顯示）
import Foundation import UIKit class LJPhotoView: UIScrollView { var ljInfo : LJPhotoInfo? lazy var ljImageView : UIImageView = { let view = UIImageView() view.clipsToBounds = true view.contentMode = .scaleAspectFit return view }() override init(frame: CGRect) { super.init(frame: frame) self.zoomScale = 1.0 self.addSubview(self.ljImageView) } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } } extension LJPhotoView{ func setCurrentImageview(_ info : LJPhotoInfo){ self.ljInfo = info if self.ljInfo?.thumbImageview?.image == nil{ self.ljInfo?.thumbImageview?.image = UIImage.init(named: "pic_broadcast_gray_square") } //無url，則通過thumbImageview獲取Image展示 //self.ljImageview.image = info.thumbImageview.image; let y : CGFloat? = (AppHeight - (info.thumbImageview?.image?.size.height)! * AppWidth / (info.thumbImageview?.image?.size.width)!) * 0.5; self.ljImageView.frame = CGRect(x: 0, y: y!, width: AppWidth, height: AppWidth*(info.thumbImageview?.image?.size.height)!/(info.thumbImageview?.image?.size.width)!) self.ljImageView.image = self.ljInfo?.thumbImageview?.image if info.largeImageURLStr != "" { let url = URL(string:info.largeImageURLStr!) self.ljImageView.kf.setImage(with: url) } } } 以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。
新聞熱點
疑難解答
