swift - 在 SwiftUI View 中设置计算属性无法编译

Question

尝试在 SwiftUI View 中设置计算属性会出现编译器错误“无法分配给属性:‘self’是不可变的”。
我该如何调用 setter？

struct Test: View{
  @State var _s = "test"
  @State var _s2 = true
  private var s : String
  { get { _s }
    set (new)
    { _s = "no test"
      _s2 = false
      // do something else
    }
  }

  var body: some View
  { Text("\(s)")
    .onTapGesture {
      self.s = "anyting"  // compiler error
    }
  }
}

Answer 1

啊哈...我明白了。只需使用非变异集

  private var s : String
  { get { _s }
    nonmutating set (new)
    { _s = "no test"
      _s2 = false
      // do something else
    }
  }