iOS 凸起tabBarButton


//自定义TabBar

class Seadra_JJBLP_CustomTabBar: UITabBar {

//    index:凸起按钮下标,protrudingHeight:凸起高度

    typealias Seadra_JJBLP_TabBarItemInfo= (topic:String, imageName:String, selectedImageName:String,index:Int,protrudingHeight:CGFloat)

    var seadra_property_itemInfo : Seadra_JJBLP_TabBarItemInfo!

    var seadra_property_tapBut = UIButton.init(type: .custom)

    var seadra_property_tabBarBlock : () -> Void = { }


//初始化

    init(itemInfo:Seadra_JJBLP_TabBarItemInfo,clickBlock:@escaping() ->Void) {

        super.init(frame: CGRect.init(x: 0, y: SCREEN_HEIGHT-kTabBarHeight, width: SCREEN_WIDTH, height: kTabBarHeight))

        seadra_property_itemInfo = itemInfo

        seadra_property_tabBarBlock = clickBlock


    }



//    重写

    override func layoutSubviews() {

        super.layoutSubviews()


        forsubinself.subviews{//避免重复创建

            if sub.isKind(of:UIControl.self) {

                let view = sub

                if view.tag==220{

                    return

//                    view.removeFromSuperview()

                }


            }

        }


        for but in self.subviews{

            if but.isKind(of:NSClassFromString("UITabBarButton")!) {

                seadra_property_tabBarButArr.append(but)

            }

        }




//        私有类型UITabBarButton转为UIView

        let button : UIView = seadra_property_tabBarButArr[seadra_property_itemInfo.index] as! UIView

        let bgView =UIControl.init(frame:CGRect.init(x: button.frame.minX, y:-seadra_property_itemInfo.protrudingHeight, width: button.frame.width, height: button.frame.width))

        bgView.tag=220


        bgView.layer.cornerRadius = bgView.frame.width*0.5

        bgView.layer.masksToBounds=true

        bgView.backgroundColor = UITabBar.appearance().barTintColor//背景颜色保持和设置的系统tabbar一致

        bgView.addTarget(self, action:#selector(seadra_func_click), for: .touchUpInside)

        self.addSubview(bgView)


//      设置tabbar按钮图片

        seadra_property_tapBut.setImage(UIImage.init(named: seadra_property_itemInfo.imageName), for: .normal)

        seadra_property_tapBut.setImage(UIImage.init(named:seadra_property_itemInfo.selectedImageName), for: .selected)

        seadra_property_tapBut.frame=CGRect.init(x:0, y:0, width: bgView.frame.width, height: bgView.frame.height)

        bgView.addSubview(seadra_property_tapBut)


        seadra_property_tapBut.setTitle(seadra_property_itemInfo.topic, for: .normal)

//        seadra_property_tapBut.titleLabel?.font = UIFont.systemFont(ofSize: 10,weight: .medium)//字体调整和系统一致

        seadra_property_tapBut.titleLabel?.font = UIFont.systemFont(ofSize: 14,weight: .medium)

        seadra_property_tapBut.setTitleColor(Seadra_JJBLP_BaseColor_999999, for: .normal)

        seadra_property_tapBut.setTitleColor(Seadra_JJBLP_BaseColor, for: .selected)

//        调整图片位置居中

        seadra_property_tapBut.imageEdgeInsets = UIEdgeInsets.init(top: -10, left: CGFloat(seadra_property_tapBut.frame.width*0.5-(seadra_property_tapBut.imageView?.frame.width)!*0.5-(seadra_property_tapBut.imageView?.frame.minX)!), bottom: 10, right: -CGFloat(seadra_property_tapBut.frame.width*0.5-(seadra_property_tapBut.imageView?.frame.width)!*0.5-(seadra_property_tapBut.imageView?.frame.minX)!))

//        调整标题位置居中

        seadra_property_tapBut.titleEdgeInsets = UIEdgeInsets.init(top: (seadra_property_tapBut.imageView?.frame.height)!, left: -CGFloat((seadra_property_tapBut.titleLabel?.frame.minX)!-seadra_property_tapBut.frame.width*0.5+(seadra_property_tapBut.titleLabel?.frame.width)!*0.5), bottom: -(seadra_property_tapBut.imageView?.frame.height)!*0.5, right: CGFloat((seadra_property_tapBut.titleLabel?.frame.minX)!-seadra_property_tapBut.frame.width*0.5+(seadra_property_tapBut.titleLabel?.frame.width)!*0.5))


    }

@objc func seadra_func_click() {

        seadra_property_tabBarBlock()//

        seadra_property_tapBut.isSelected = true//点击后选中状态

    }


//    扩展点击范围

    overridefunchitTest(_point:CGPoint, with event:UIEvent?) ->UIView? {

        if self.isHidden==false{

            let bgView =self.viewWithTag(220)

            if((bgView?.frame.contains(point))==true) {

                returnbgView

            }

        }

        return super.hitTest(point, with: event)

    }



自定义TabBarController中使用

//    重写代理方法

    override functabBar(_tabBar:UITabBar, didSelect item:UITabBarItem) {

//  点击其它tabbarbutton走这个代理,在这里面把凸起按钮改成未选中状态

        self.mainTabBar.seadra_property_tapBut.isSelected = false

    }

mainTabBar = Seadra_JJBLP_CustomTabBar.init(itemInfo: ("分类","Seadra_JJBLP_tab_hero_default","Seadra_JJBLP_tab_hero_selected",self.outIndex,30), clickBlock: {//点击凸起按钮,选中对应下标界面

        self.selectedIndex=self.outIndex

        })        

self.setValue(mainTabBar, forKey:"tabBar")//替换系统tabbar

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