删去iOS项目中的storyboard

删去项目中的storyboard, (变成一个纯代码的iOS UIKit项目), 需要几步?

• 找到storyboard, 删掉它.
• 直接用ViewController.

删去storyboard

• 首先, 你得有(新建)一个storyboard项目.
• 删去storyboard. 选”Move to Trash”.
• 删去plist中的storyboard name.

• 删去deploy target中的Main Interface, 本来是”main”, 把它变为空.

注意xcode 14之后改为删去这儿的文字”Main”:

用上自己的ViewController

在ViewController里写上自己的完美View. 比如:

import UIKit
class ViewController: UIViewController {
    override func loadView() {
        view = UIView()
        view.backgroundColor = .systemBlue
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
}

设置新的rootViewController.

• 在SceneDelegate中设置rootViewController. (iOS 13)

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).
        guard let windowScene = (scene as? UIWindowScene) else { return }
        let window = UIWindow(windowScene: windowScene)
        window.rootViewController = ViewController()
        self.window = window
        window.makeKeyAndVisible()
    }
 ...

• tvOS没有SceneDelegate (或许你想要兼容iOS 13以前的旧版本):

import UIKit
@main
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
    func application(_: UIApplication, didFinishLaunchingWithOptions _: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        window = UIWindow(frame: UIScreen.main.bounds)
        window?.rootViewController = ViewController()
        window?.makeKeyAndVisible()
        return true
    }
...

运行程序, 看到自己在ViewController里设置的View.

Ta-da!