如何将不同类型的视图传递给 SwiftUI 中的另一个视图？

Question

So I have this TestView which accepts headerContent and bodyContent ,

struct TestView<Content: View>: View {
  var headerContent: (() -> Content)?  = nil
  let bodyContent: () -> Content
  
  var body: some View {

    VStack {
      headerContent?()
      bodyContent()
    }
  }
}

And I use it as,

struct ContentView: View {  
  var body: some View {
    TestView(headerContent: {
      Text("HeaderContent")
    }) {
      ScrollView {

      }
    }
  }
}

But I get the following error,

Cannot convert value of type 'ScrollView<EmptyView>' to closure result type 'Text'

What am I missing?

Answer 1

You need to have two View generics, since headerContent and bodyContent are not the same.

Without this, you are saying there is some concrete type Content that conforms to View . However, both Text and ScrollView are different types, not the same.

Code:

struct TestView<HeaderContent: View, BodyContent: View>: View {
    var headerContent: (() -> HeaderContent)? = nil
    let bodyContent: () -> BodyContent

    var body: some View {
        VStack {
            headerContent?()
            bodyContent()
        }
    }
}