iOS UIKit 纯代码实时预览

终于纯代码也可以实时预览写代码了
RelaxScoreVC 就是自己绘制的控制器
SetTimerAlertView 就是自己写 UIView 控件

#if DEBUG
import SwiftUI
// 视图控制器的SwiftUI包装器
private struct ViewControllerPreview: UIViewControllerRepresentable {
   func makeUIViewController(context: Context) -> RelaxScoreVC {
       RelaxScoreVC()
   }
   
   func updateUIViewController(_ uiViewController: RelaxScoreVC, context: Context) {}
}
// UIView的SwiftUI包装器
private struct CustomViewPreview: UIViewRepresentable {
   func makeUIView(context: Context) -> SetTimerAlertView {
       let test = SetTimerAlertView()
       
       test.showView(window: nil)
       return test
   }
   
   func updateUIView(_ uiView: SetTimerAlertView, context: Context) {}
}
// 预览提供者
@available(iOS 13.0, *)
struct RelaxScoreVCPreviews: PreviewProvider {
   static var previews: some View {
       
       // 预览视图控制器
       ViewControllerPreview()
           .previewDevice(PreviewDevice(rawValue: "iPhone 15 Pro Max"))
           .previewDisplayName("视图控制器 - iPhone 15 Pro Max")
   }
}

#endif