iOS自定义UITabBar仿今日头条效果

override func viewDidLoad() {  super.viewDidLoad()  // 替换 tabbar  let _tabBar = TabBar()  // 监听按钮点击事件  _tabBar.handleBtnReleaseClick(self, action: #selector(btnReleaseClick))  setValue(_tabBar, forKey: "tabBar")}

// MARK: 删除占位“按钮”，添加自定义按钮override func layoutSubviews() {  super.layoutSubviews()  btnRelease.backgroundColor = UIColor.white  // 过滤掉 _UIBarBackground 类型的对象，只保留 UITabBarButton 类型的对象  let tabbarButtonList = iews.filter{NSStringFromClass(type(of: $0)) == abBarButton"}  // 取出需要删除的“按钮”（经测试，知道中间那个加号按钮的下标是2）  let tmpView = tabbarButtonList[safe: 2]  // 把默认生成的从父容器中移除  tmpView?.removeFromSuperview()  let x = (InnerConst.ScreenW - btnRelease.w) * 0.5  let y = InnerConst.ButtonOffsetY  btnRelease.origin = CGPoint(x: x, y: y)  addSubview(btnRelease)}

// MARK: 处理默认情况下，按钮超出 TabBar 以外区域不能点击问题override func hitTest(_ point: CGPoint, with event: UIEvent?) -View? {  if isHidden == false {    let newPoint = convert(point, to: btnRelease)    if btnRelease.point(inside: newPoint, with: event) {      return btnRelease    }    return super.hitTest(point, with: event)  }  return super.hitTest(point, with: event)}

func handleBtnReleaseClick(_ target: AnyObject?, action: Selector) {  btnRelease.addTarget(target, action: action, for: .touchUpInside)}