SwiftUI之页面跳转

1.更改根控制器页面：

Button.init("返回") {

            let screnDelegate: UIWindowSceneDelegate? = {

                            var uiScreen: UIScene?

                            UIApplication.shared.connectedScenes.forEach { (screen) in

                                uiScreen = screen

                            }

                            return (uiScreen?.delegate as? UIWindowSceneDelegate)

                        }()

             screnDelegate?.window!?.rootViewController  = UIHostingController(rootView: HomeView());

            或者

            UIApplication.shared.windows.first?.rootViewController  = UIHostingController(rootView: HomeView())

        }

2.push跳转

import SwiftUIstruct HomeView:View {var body: some View{return List{ForEach(0..<3, id: \.self) { index inif index==0{NavigationLink(destination: one.init(name: "", age: 1)){Text("\(index)")}}if index==1{NavigationLink(destination: Two()){Text("\(index)")}}}}}}

 push/pop:跳转的时候带参数，控制pop返回

import SwiftUIstruct HomeView:View {@State var isShow = falsevar body: some View{//isActive是控制是否自动跳转，false不自动跳转,跳转到下一个页面后isShow就变成了trueNavigationLink(destination: one(showing:$isShow), isActive: self.$isShow) {Text("one")}}}

pop返回：mport SwiftUIstruct one: View {@Binding var showing :Boolvar body: some View {Button("点击返回") {self.showing = false//这个控制pop返回}}}

pop到根视图：在SwiftUI下实现popToRootViewController()返回根视图 - 知乎

present:（fullScreenCover）

import SwiftUIstruct HomeView:View {@State var isPresented = falsevar body: some View{Button("present"){self.isPresented = true}.fullScreenCover(isPresented: $isPresented) {print("消失")} content: {Two()}}
}

import SwiftUIstruct Two: View {@Environment(\.presentationMode) var presentationModessvar body: some View {Text("Hello,two")Button("返回"){self.presentationModess.wrappedValue.dismiss()//返回的方法}}
}

sheet:（和present类似，只需改变fullScreenCover为sheet）

import SwiftUIstruct HomeView:View {@State var isPresented = falsevar body: some View{Button("sheet"){self.isPresented = true}.sheet(isPresented: $isPresented) {//这个是页面消失后的回调print("消失")} content: {Two()}}
}

   present返回

import SwiftUIstruct Two: View {
//该视图将创建一个名为presentationMode的属性，该属性附加到存储在应用程序环境中的演示模式变量中@Environment(\.presentationMode) var presentationModessvar body: some View {Text("Hello,two")Button("返回"){
//需要在其中添加wrapdValue，因为presentationMode实际上是一个绑定，因此它可以由系统自动更新——我们需要在其中进行解包以检索实际的呈现方式，以关闭视图。self.presentationModess.wrappedValue.dismiss()//返回的方法}}
}

alert:提示框,最多两个按钮

import SwiftUIstruct HomeView:View {@State var showAlert = falsevar body: some View{Button("alert"){self.showAlert = true}.alert(isPresented: $showAlert){
//         Alert(title: Text("one"), message: Text("two"), dismissButton: .default(Text("ok")))return Alert(title: Text("one"), message: Text("one"), primaryButton: .cancel(Text("取消"), action: {print("取消")}), secondaryButton:.default(Text("确定"), action: {print("确定")}))}}
}

actionsheet:提示框，可以有多个按钮

import SwiftUIstruct HomeView:View {@State var isPresented = falsevar body: some View{Button("present"){self.isPresented = true}.actionSheet(isPresented: $isPresented) {ActionSheet(title: Text("Change background"), message: Text("Select a new color"), buttons: [.default(Text("Red")) { print("Red") },.default(Text("Green")) { print("green") },.default(Text("Blue")) {print("blue") },.cancel()])}}
}

跳转到safari浏览器：必须要加上http

Link(destination: URL(string: "https://www.baidu.com")!) {Text("百度搜索")
}

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