如何使用 Swift、iOS 7 设置 rootViewController
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How to set the rootViewController with Swift, iOS 7
提问by Stephen Fox
I want to set the rootViewController in the app delegate ..
我想在应用程序委托中设置 rootViewController ..
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
var rootView: MyRootViewController = MyRootViewController()
//Code to set this viewController as the root view??
return true
}
回答by fruechtemuesli
If you are using a storyboard and want to set your rootViewController programmatically, first make sure the ViewController has a Storyboard ID in the Identity Inspector. Then in the AppDelegate do the following:
如果您正在使用故事板并希望以编程方式设置您的 rootViewController，请首先确保 ViewController 在 Identity Inspector 中具有故事板 ID。然后在 AppDelegate 中执行以下操作：
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// get your storyboard
let storyboard = UIStoryboard(name: "Main", bundle: nil)
// instantiate your desired ViewController
let rootController = storyboard.instantiateViewControllerWithIdentifier("MyViewController") as! UIViewController
// Because self.window is an optional you should check it's value first and assign your rootViewController
if let window = self.window {
window.rootViewController = rootController
}
return true
}
回答by Connor
You can do something like this.
你可以做这样的事情。
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {
var rootView: MyRootViewController = MyRootViewController()
if let window = self.window{
window.rootViewController = rootView
}
return true
}
回答by A.G
Swift 2.0:
斯威夫特 2.0：
var window: UIWindow?
var storyboard:UIStoryboard?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
window = UIWindow(frame: UIScreen.mainScreen().bounds)
window?.makeKeyAndVisible()
storyboard = UIStoryboard(name: "Main", bundle: nil)
let rootController = storyboard!.instantiateViewControllerWithIdentifier("secondVCID")
if let window = self.window {
window.rootViewController = rootController
}
回答by Aleksandr Movsesyan
In order to get it to show there are some things you need to do if you are not using a storyboard. Inside the AppDelegate inside the function application.
为了让它显示出来，如果您不使用故事板，您需要做一些事情。在函数应用程序内的 AppDelegate 内。
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
let frame = UIScreen.mainScreen().bounds
window = UIWindow(frame: frame)
let itemsViewControler: UITableViewController = BNRItemsViewController()
if let window = self.window{
window.rootViewController = itemsViewControler
window.makeKeyAndVisible()
}
return true
}
回答by Thiago Arreguy
if let tabBarController = self.window!.rootViewController as? UITabBarController
{
tabBarController.selectedIndex = 0
}
