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核心代码：
//调用类 import UIKit class RootViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() self.navigationItem.title = '首页' self.view.backgroundColor = UIColor.white let bgImgView = UIImageView(frame: self.view.bounds) bgImgView.image = UIImage(named: 'IMG_0023.png') self.view.addSubview(bgImgView) //弄个按钮调试 let btn = UIButton(frame: CGRect(x: (self.view.frame.width - 80) / 2, y: 150, width: 80, height: 30)) btn.setTitle('点击开始', for: UIControlState()) btn.setTitleColor(UIColor.white, for: UIControlState()) btn.backgroundColor = UIColor.red btn.addTarget(self, action: #selector(self.btnAct(send:)), for: .touchUpInside) self.view.addSubview(btn) } func btnAct(send: UIButton){ let myhud = myHUD(style: .gray, in: self.view) myhud.title = '加载中' myhud.show() //模拟3秒之后调用移除方法 self.delay(3) { //移除时调用 myhud.title = '加载成功' myhud.remove(afterDelay: 1) //存活一秒 } } //延迟的方法 func delay(_ delay: TimeInterval, closure:@escaping ()->()){ let time = DispatchTime.now() + Double(Int64(delay * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC) DispatchQueue.main.asyncAfter(deadline: time, execute: closure) } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } } //实现类 import UIKit enum HudStyle { case lighted //高亮 case gray //灰色 } class myHUD: UIView { public var title: String!{ //标题 didSet{ self.titleLabel?.text = self.title } } fileprivate var style: HudStyle = HudStyle.gray //风格 fileprivate var showInView: UIView! //显示在那个视图之上 fileprivate var activity: UIActivityIndicatorView? //菊花 fileprivate var bgView: UIView? //蒙版透明层 fileprivate var titleLabel: UILabel? //显示标题label fileprivate var showView: UIView? //显示的区域 fileprivate var tickImgView: UIImageView? //加载完成时，论文，显示的图片 fileprivate let showWidth: CGFloat = 70 //显示区域的大小 init(style: HudStyle, in showView: UIView) { super.init(frame: showView.frame) self.style = style self.showInView = showView self.frame = showView.frame //设置本身的区域 self.bgView = UIView(frame: showView.frame) //初始化背景视图 self.bgView?.backgroundColor = UIColor.gray self.bgView?.alpha = 0.3 self.addSubview(self.bgView!) ///->初始显示区域视图 self.showView = UIView(frame: CGRect(x: 0, y: 0, width: showWidth, height: showWidth)) self.showView?.layer.cornerRadius = 5 self.showView?.layer.masksToBounds = true self.showView?.center = self.center switch style { case .lighted: self.showView?.backgroundColor = UIColor(red: 176/255.0, green: 220/255.0, blue: 255/255.0, alpha: 1) case .gray: self.showView?.backgroundColor = UIColor.gray } self.addSubview(self.showView!) } required init?(coder aDecoder: NSCoder) { fatalError('init(coder:) has not been implemented') } //MARK:公共接口 ///show->显示使用时必须调用 public func show(){ self.loadActivity() self.showInView.addSubview(self) } ///remove->移除时调用 public func remove(afterDelay: TimeInterval){ self.activity?.stopAnimating() self.activity?.removeFromSuperview() self.loadTickImg() self.delay(afterDelay) { self.removeFromSuperview() } } //MARK:私有方法 //加载成功之后的图片 fileprivate func loadTickImg(){ let activityH: CGFloat = 50 let x = (self.showView!.frame.width - activityH) / 2 self.tickImgView = UIImageView(frame: CGRect(x: x, y: 0, width: activityH, height: activityH)) //没找到素材，随便搞了个图片=>>改成透明的图片即可 self.tickImgView?.image = UIImage(named: 'tick.jpg') self.showView?.addSubview(self.tickImgView!) } //加载菊花,文字 fileprivate func loadActivity(){ //如果没有设置标题，则菊花居中即可 if self.title == nil { //菊花高度 let activityH: CGFloat = 50 //菊花 self.activity = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.whiteLarge) self.activity?.frame = CGRect(x: 0, y: 0, width: activityH, height: activityH) self.activity?.center = self.showView!.center self.activity?.startAnimating() self.showView?.addSubview(self.activity!) }else{ //菊花高度 let activityH: CGFloat = 50 //菊花 self.activity = UIActivityIndicatorView(activityIndicatorStyle: UIActivityIndicatorViewStyle.whiteLarge) let x = (self.showView!.frame.width - activityH) / 2 self.activity?.frame = CGRect(x: x, y: 0, width: activityH, height: activityH) self.activity?.startAnimating() self.showView?.addSubview(self.activity!) //文字 self.titleLabel = UILabel(frame: CGRect(x: 0, y: activityH, width: self.showWidth, height: self.showWidth - activityH)) self.titleLabel?.textAlignment = .center self.titleLabel?.font = UIFont.systemFont(ofSize: 11) switch self.style { case .gray: self.titleLabel?.textColor = UIColor.white case .lighted: self.titleLabel?.textColor = UIColor.black } self.titleLabel?.text = self.title self.showView?.addSubview(self.titleLabel!) } } //延迟异步执行方法 fileprivate func delay(_ delay: TimeInterval, closure:@escaping ()->()){ let time = DispatchTime.now() + Double(Int64(delay * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC) DispatchQueue.main.asyncAfter(deadline: time, execute: closure) } deinit { print('HUD释放') } }，开题报告
