前面的几篇文章总结了怎样用 SwiftUI 搭建基本框架时候的一些注意点（和这篇文章在相同的分类里面，有需要了可以点进去看看），这篇文章要总结的东西是用地图数据处理结合来说的，通过这篇文章我们能总结到的点有下面几点：
1、SwiftUI怎样使用UIKit的控件
2、网络请求到的数据我们怎样刷新页面（模拟）
3、顺便总结下系统地图的一些基本使用（定位、地图显示、自定义大头针等等）
（点击地图位置会获取经纬度，反地理编译得到具体的位置信息，显示在列表中）
SwiftUI怎样使用UIKit的控件
我们来总结一下，SwiftUI怎么使用UIKit的控件，中间的连接就是 UIViewRepresentable，UIViewRepresentable 是一个协议。我们结合他的源码来具体看看它的内容：
@available(iOS 13.0, tvOS 13.0, *) @available(macOS, unavailable) @available(watchOS, unavailable) public protocol UIViewRepresentable : View where Self.Body == Never { /// The type of view to present. associatedtype UIViewType : UIView /// Creates the view object and configures its initial state. /// /// You must implement this method and use it to create your view object. /// Configure the view using your app's current data and contents of the /// `context` parameter. The system calls this method only once, when it /// creates your view for the first time. For all subsequent updates, the /// system calls the ``UIViewRepresentable/updateUIView(_:context:)`` /// method. /// /// - Parameter context: A context structure containing information about /// the current state of the system. /// /// - Returns: Your UIKit view configured with the provided information. func makeUIView(context: Self.Context) -> Self.UIViewType /// Updates the state of the specified view with new information from /// SwiftUI. /// /// When the state of your app changes, SwiftUI updates the portions of your /// interface affected by those changes. SwiftUI calls this method for any /// changes affecting the corresponding UIKit view. Use this method to /// update the configuration of your view to match the new state information /// provided in the `context` parameter. /// /// - Parameters: /// - uiView: Your custom view object. /// - context: A context structure containing information about the current /// state of the system. func updateUIView(_ uiView: Self.UIViewType, context: Self.Context) static func dismantleUIView(_ uiView: Self.UIViewType, coordinator: Self.Coordinator) /// A type to coordinate with the view. associatedtype Coordinator = Void func makeCoordinator() -> Self.Coordinator typealias Context = UIViewRepresentableContext<Self> }