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SwiftUI & Compose View

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//
//  ContentView.swift
//  Landmarks
//
//  Created by 夏凌晨 on 2020/10/27.
//  Copyright © 2020 webgeeker. All rights reserved.
//

import SwiftUI

struct ContentView: View {
  var body: some View {
    VStack {
      MapView()
        .edgesIgnoringSafeArea(.top)
        .frame(height: 300)
      CircleImage()
        .offset(y: -130)
        .padding(.bottom, -130)
      VStack(alignment: .leading) {
        Text("Turtle Rock")
          .font(.title)
        HStack {
          Text(/*@START_MENU_TOKEN@*/"Joshua Tree National Park"/*@END_MENU_TOKEN@*/)
            .font(.subheadline)
          Spacer()
          Text("California")
            .font(.subheadline)
        }
      }
      .padding(.all)
      Spacer()
    }
  }
}

struct ContentView_Previews: PreviewProvider {
  static var previews: some View {
    ContentView()
  }
}

/*
 
 默认情况下，SwiftUI 视图文件声明两个结构。
 第一种结构符合View协议，并描述了视图的内容和布局。
 第二个结构声明该视图的预览。
 
*/

//
//  CircleImage.swift
//  Landmarks
//
//  Created by 夏凌晨 on 2020/10/28.
//  Copyright © 2020 webgeeker. All rights reserved.
//

import SwiftUI

struct CircleImage: View {
  var body: some View {
    Image("turtlerock")
      .clipShape(/*@START_MENU_TOKEN@*/Circle()/*@END_MENU_TOKEN@*/)
      .overlay(Circle().stroke(Color.white, lineWidth: 4))
      .shadow(radius: 10)
  }
}

struct CircleImage_Previews: PreviewProvider {
  static var previews: some View {
    CircleImage()
  }
}

//
//  MapView.swift
//  Landmarks
//
//  Created by 夏凌晨 on 2020/10/28.
//  Copyright © 2020 webgeeker. All rights reserved.
//

import SwiftUI
import MapKit

struct MapView: UIViewRepresentable {
//  var body: some View {
//    Text(/*@START_MENU_TOKEN@*/"Hello, World!"/*@END_MENU_TOKEN@*/)
//  }
  func makeUIView(context: Context) -> MKMapView {
    MKMapView(frame: .zero)
  }
  func updateUIView(_ uiView: MKMapView, context: Context) {
    let coordinate = CLLocationCoordinate2D(latitude: 34.011286, longitude: -116.166868)
    let span = MKCoordinateSpan(latitudeDelta: 2.0, longitudeDelta: 2.0)
    let region = MKCoordinateRegion(center: coordinate, span: span)
    uiView.setRegion(region, animated: true)
  }
}

struct MapView_Previews: PreviewProvider {
  static var previews: some View {
    MapView()
  }
}


/*

UIViewRepresentable协议具有两个需要添加的要求：
创建MKMapView的makeUIView（context:)方法
和配置视图并响应所有更改的updateUIView（_：context :)方法。

*/

refs

https://developer.apple.com/tutorials/swiftui/creating-and-combining-views#Compose-the-Detail-View

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