我想從appdelegate設置初始viewcontroller。我找到了一個很好的答案，但是在目標C中，我無法迅速實現同一目標。通過情節提要以編程方式設置初始視圖控制器- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions{ self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds]; UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil]; UIViewController *viewController = // determine the initial view controller here and instantiate it with [storyboard instantiateViewControllerWithIdentifier:<storyboard id>]; self.window.rootViewController = viewController; [self.window makeKeyAndVisible]; return YES;}有人能幫忙嗎？我希望初始Viewcontroller依賴于使用條件語句滿足的某些條件。
3 回答
三國紛爭
TA貢獻1804條經驗 獲得超7個贊
我使用此線程幫助我將目標C轉換為swift，并且可以完美地工作。
在Swift中實例化并呈現一個viewController
Swift 2代碼：
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let initialViewController = storyboard.instantiateViewControllerWithIdentifier("LoginSignupVC")
self.window?.rootViewController = initialViewController
self.window?.makeKeyAndVisible()
return true
}
Swift 3代碼：
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let initialViewController = storyboard.instantiateViewController(withIdentifier: "LoginSignupVC")
self.window?.rootViewController = initialViewController
self.window?.makeKeyAndVisible()
return true
}
繁星淼淼
TA貢獻1775條經驗 獲得超11個贊
嘗試這個。例如：您應該UINavigationController用作初始視圖控制器。然后，您可以將任何視圖控制器設置為情節提要中的根。
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
let storyboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let navigationController:UINavigationController = storyboard.instantiateInitialViewController() as UINavigationController
let rootViewController:UIViewController = storyboard.instantiateViewControllerWithIdentifier("VC") as UIViewController
navigationController.viewControllers = [rootViewController]
self.window?.rootViewController = navigationController
return true
}
看到我的故事板屏幕。
holdtom
TA貢獻1805條經驗 獲得超10個贊
對于Swift 3，Swift 4：
從情節提要實例化根視圖控制器：
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// this line is important
self.window = UIWindow(frame: UIScreen.main.bounds)
// In project directory storyboard looks like Main.storyboard,
// you should use only part before ".storyboard" as it's name,
// so in this example name is "Main".
let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
// controller identifier sets up in storyboard utilities
// panel (on the right), it called Storyboard ID
let viewController = storyboard.instantiateViewController(withIdentifier: "YourViewControllerIdentifier") as! YourViewController
self.window?.rootViewController = viewController
self.window?.makeKeyAndVisible()
return true
}
如果要UINavigationController用作根用戶：
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// this line is important
self.window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier: "YourViewControllerIdentifier") as! YourViewController
let navigationController = UINavigationController.init(rootViewController: viewController)
self.window?.rootViewController = navigationController
self.window?.makeKeyAndVisible()
return true
}
從XIB實例化根視圖控制器：
幾乎一樣，但是不是一行
let storyboard = UIStoryboard.init(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier: "YourViewControllerIdentifier") as! YourViewController
你必須寫
let viewController = YourViewController(nibName: "YourViewController", bundle: nil)
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