SwiftUI：从函数绑定值

Question

我想绑定函数中的值。但我有以下错误：

Cannot convert value of type 'Int' to expected argument type 'Binding<Int>'

示例代码：

struct MyFirstView: View {

  var body: some View {
    MySecondView(index: getIndex())
  }
  
  func getIndex() -> Int {
    /* Code to get the index.... */
        
    return index
  }
}

struct MySecondView: View {
  
  @Binding var index: Int

  var body: some View {
    Text("Current index : ", index)
  }
}

谢谢。

Answer 1

您只需要在函数中动态生成绑定（如果您确实需要在那里绑定），例如

  func getIndex() -> Binding<Int> {
    /* Code to get the index.... */

    return Binding(get: {index}, set: {index = $0})
//    return Binding(get: {index}, set: {_ in }) // alternate 
  }