我正在研究Apple网站上的SwiftUI教程。从this实现的演示网址。它为NavigationLink和PresentationLink抛出错误。下面是我的正文段落代码，varbody:someView{NavigationView{List{FeaturedLandmarks(landmarks:featured).scaledToFill().frame(height:200).clipped().listRowInsets(EdgeInsets())ForEach(categories.keys.sorted().identified(by:\.self)){keyinCat