[英]How to generate iOS 13 SwiftUI project in XCode?
So currently in XCode 13, when I create the project for the first time, xcode generates project structure for iOS 14.0+.所以目前在 XCode 13 中,当我第一次创建项目时,xcode 会为 iOS 14.0+ 生成项目结构。
I am new to iOS and I want to create a project to target iOS 13.0+.我是 iOS 新手,我想创建一个针对 iOS 13.0+ 的项目。 How do I tell XCode to generate project template for iOS 13.0+?如何告诉 XCode 为 iOS 13.0+ 生成项目模板?
Add this in a .swift
file将此添加到.swift
文件中
import UIKit
import SwiftUI
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
return true
}
// MARK: UISceneSession Lifecycle
func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
// Called when a new scene session is being created.
// Use this method to select a configuration to create the new scene with.
return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
}
func application(_ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>) {
// Called when the user discards a scene session.
// If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.
// Use this method to release any resources that were specific to the discarded scenes, as they will not return.
}
}
class SceneDelegate: UIResponder, UIWindowSceneDelegate {
var window: UIWindow?
func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
// Use this method to optionally configure and attach the UIWindow `window` to the provided UIWindowScene `scene`.
// If using a storyboard, the `window` property will automatically be initialized and attached to the scene.
// This delegate does not imply the connecting scene or session are new (see `application:configurationForConnectingSceneSession` instead).
// Create the SwiftUI view that provides the window contents.
let contentView = ContentView()
// Use a UIHostingController as window root view controller.
if let windowScene = scene as? UIWindowScene {
let window = UIWindow(windowScene: windowScene)
window.rootViewController = UIHostingController(rootView: contentView)
self.window = window
window.makeKeyAndVisible()
}
}
func sceneDidDisconnect(_ scene: UIScene) {
// Called as the scene is being released by the system.
// This occurs shortly after the scene enters the background, or when its session is discarded.
// Release any resources associated with this scene that can be re-created the next time the scene connects.
// The scene may re-connect later, as its session was not neccessarily discarded (see `application:didDiscardSceneSessions` instead).
}
func sceneDidBecomeActive(_ scene: UIScene) {
// Called when the scene has moved from an inactive state to an active state.
// Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
}
func sceneWillResignActive(_ scene: UIScene) {
// Called when the scene will move from an active state to an inactive state.
// This may occur due to temporary interruptions (ex. an incoming phone call).
}
func sceneWillEnterForeground(_ scene: UIScene) {
// Called as the scene transitions from the background to the foreground.
// Use this method to undo the changes made on entering the background.
}
func sceneDidEnterBackground(_ scene: UIScene) {
// Called as the scene transitions from the foreground to the background.
// Use this method to save data, release shared resources, and store enough scene-specific state information
// to restore the scene back to its current state.
}
}
Then Change the Application Scene Manifest
entry in the Info.plist
然后更改Info.plist
的Application Scene Manifest
条目
Make sure your remove / comment out the @main
and the app starts with the ContentView
确保您删除/注释掉@main
并且应用程序以ContentView
开头
I have achieved creating an iOS 13 compatible SwiftUI project with the following approach.我已经通过以下方法创建了一个兼容 iOS 13 的 SwiftUI 项目。 This has one block for iOS 13 and another block for iOS 14+这有一个用于 iOS 13 的块和另一个用于 iOS 14+ 的块
Step 0: Create a SwiftUI project with XCode<\/strong>第 0 步:使用 XCode 创建一个 SwiftUI 项目<\/strong>
This will have a main swift file and a ContentView.swift<\/code> .
这将有一个主 swift 文件和一个
ContentView.swift<\/code> 。
// ContentView.swift
import SwiftUI
struct ContentView: View {
var body: some View {
Text("Hello")
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
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