SwiftUI：隐藏tabView（自定义弹窗弹出时）

先看下效果：

代码：

import SwiftUI

enum NotifyDefine:String {
    case NotifyIsHiddenTabView = "is_hidden_tabview"
}

struct ContentView: View {
    
    @State private var isHiddenTabView = false
    
    var body: some View {
        VStack {
            TabView() {
                if isHiddenTabView == false{
                    first()
                        .font(.system(size: 30, weight: .bold, design: .rounded))
                        .tabItem {
                            Image(systemName: "house.fill")
                            Text("first")
                        }.tag(0)
                    second()
                        .font(.system(size: 30, weight: .bold, design: .rounded))
                        .tabItem {
                            Image(systemName: "bookmark.circle.fill")
                            Text("second")
                        }.tag(1)
                    
                    third()
                        .font(.system(size: 30, weight: .bold, design: .rounded))
                        .tabItem {
                            Image(systemName: "person.crop.circle")
                            Text("third")
                        }.tag(3)
                }
            }.onAppear(){
                // tabView是否隐藏通知
                NotificationCenter.default.addObserver(forName: NSNotification.Name(rawValue: NotifyDefine.NotifyIsHiddenTabView.rawValue), object: nil, queue: .main) { notify in
                    isHiddenTabView = notify.object as? Bool ?? false
                }
            }
        }
        .padding()
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}


struct first: View{
    
    @State private var isUpCreate = false
    
    
    var body: some View{
        ZStack{
            Button {
                isUpCreate = true
                NotificationCenter.default.post(name: NSNotification.Name(rawValue: NotifyDefine.NotifyIsHiddenTabView.rawValue), object: isUpCreate)
            } label: {
                Text("first")
            }
            
            if isUpCreate{
                popUpView {
                    self.isUpCreate = false
                    NotificationCenter.default.post(name: NSNotification.Name(rawValue: NotifyDefine.NotifyIsHiddenTabView.rawValue), object: isUpCreate)
                }.edgesIgnoringSafeArea(.all)
            }
        }
    }
}

struct second: View{
    var body: some View{
        VStack{
            Text("second")
        }.background(Color.yellow)
    }
}

struct third: View{
    var body: some View{
        VStack{
            Text("third")
        }.background(Color.orange)
    }
}


struct popUpView: View{
    
    let ScreenW = UIScreen.main.bounds.width
    let ScreenH = UIScreen.main.bounds.height
    @State var contentH = 400.0
    var popView: (() -> Void)?
    
    var body: some View{
        VStack{
            VStack{
                Spacer()
                HStack{
                    Text("popView").frame(width: ScreenW, height: ScreenH - contentH)
                }
                Spacer()
            }.background(Color(hex: 0x000000, alpha: 0.5))
                .onTapGesture {
                    if nil != popView{
                        popView!()
                    }
                }
            VStack{
                Spacer()
                Text("contentView").frame(width: ScreenW, height: contentH)
                Spacer()
            }.background(SwiftUI.Color.red)
        }
    }
    
    func Color(hex: UInt, alpha: Double) -> Color {
        return SwiftUI.Color (
            red: CGFloat((hex & 0xFF0000) >> 16) / 255.0,
            green: CGFloat((hex & 0x00FF00) >> 8) / 255.0,
            blue: CGFloat(hex & 0x0000FF) / 255.0,
            opacity: alpha
        )
    }
}

注意：这里只是弹窗跳出是下导航tabView的隐藏，如果是NavigationView跳转后的页面隐藏tabView，只需要把tabView套在NavigationView里面就可以了。