SwiftUI - navigationBarBackButton

Question

1. 如何在navigationBarBackButton中更改SwiftUI颜色？(默认情况下是蓝色的)
2. 如何在navigationBarBackButton中更改SwiftUI文本

这是我的代码(一个例子)：

struct ExercisesList : View {
    var exercises : [Exercise]
    var body: some View {

        NavigationView {
            List(self.exercises.identified(by: \.number)) {exercise in
                NavigationLink(destination: ExerciseDetailView(exercise: exercise)) {
                    ExerciseRow(exercisE: exercise)
                }
            }
            .navigationBarTitle(Text("Exercises"))

        }
    }
}

默认情况下，“navigationBarBackButton”中的ExerciseDetailView有一个练习的文本和蓝色的颜色。

我的问题是我怎样才能操纵这两个？

Answer 1

这里有一个解决办法。希望能帮上忙。这样，您也可以使用自定义UIColor。

struct ExercisesList : View {
    var exercises : [Exercise]

    var body: some View {

        UINavigationBar.appearance().tintColor = UIColor.red

        return  NavigationView {
            List(self.exercises.identified(by: \.number)) { exercise in
                NavigationLink(destination: ExerciseDetailView(exercise: exercise)) {
                    ExerciseRow(exercisE: exercise)
                }
            }
        }
        .navigationBarTitle(Text("Exercises"))


    }
}

Answer 2

目前，还没有直接的方法(XCode 11 beta 3)。但是您可以使用UINavigationBar方法，

见下文代码：

 struct ExercisesList : View {
     var exercises : [Exercise]

     init() {
       //navigationBarBackButton color will change//
         UINavigationBar.appearance().tintColor = .purple
       // you can also set backgroundColor//
         UINavigationBar.appearance().backgroundColor = .white
     }

     var body: some View {

         NavigationView {
             List(self.exercises.identified(by: \.number)) {exercise in
                 NavigationLink(destination: ExerciseDetailView(exercise: exercise)) {
                     ExerciseRow(exercisE: exercise)
                 }
             }
             .navigationBarTitle(Text("Exercises"))
         }
     }
 }