Swift -在App Delegate中实例化不带故事板的导航控制器
Swift -在App Delegate中实例化不带故事板的导航控制器
提问于 2015-06-21 00:43:15
我正在重建一个没有故事板的应用程序，其中我遇到最大麻烦的部分是以编程方式导航视图到视图。很少有东西不使用故事板，所以很难找到这个问题的答案。
我的问题很简单。我有我的ViewController和SecondViewController，我想从前者推向后者。
在AppDelegate中
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
window = UIWindow(frame: UIScreen.mainScreen().bounds)
window?.backgroundColor = UIColor.whiteColor()
window?.rootViewController = ViewController()
window?.makeKeyAndVisible()
return true
}然后在ViewController.swift中
class ViewController: UIViewController, AVAudioPlayerDelegate, UITextFieldDelegate {
override func viewDidLoad() {
super.viewDidLoad()
startFinishButton.setTitle("Begin", forState: .Normal)
startFinishButton.addTarget(self, action: "moveToSecondViewController", forControlEvents: .TouchUpInside)
view.addSubview <*> startFinishButton
}
func moveToSecondViewController(sender: UIButton) {
let vc = SecondViewController()
println(self.navigationController) // returns nil
self.navigationController?.pushViewController(vc, animated: true)
}
}打印self.navigationController返回nil。我试过这样做：
在创建ViewController类时使用var navController = UINavigationController() (但在ViewDidLoad外部的类声明下面)，并使用navController变量完成推送，但这并不起作用。
我在想，也许解决方案是在App Delegate中创建一个导航控制器，我猜整个应用程序都会使用它作为全局变量？
我希望这篇文章可以服务于许多其他刚接触Swift并希望从他们的应用程序中删除故事板的人。
感谢您的关注和帮助。
回答 2
Stack Overflow用户
回答已采纳
发布于 2016-12-12 15:11:02
Swift 3中的
将此代码放在AppDelegate类的didFinishLaunchingWithOptions方法中。
window = UIWindow(frame: UIScreen.main.bounds)
let mainController = MainViewController() as UIViewController
let navigationController = UINavigationController(rootViewController: mainController)
navigationController.navigationBar.isTranslucent = false
self.window?.rootViewController = navigationController
self.window?.makeKeyAndVisible()Stack Overflow用户
发布于 2015-06-21 00:51:40
AppDelegate中的
var window: UIWindow?
var navController: UINavigationController?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
navController = UINavigationController()
var viewController: ViewController = ViewController()
self.navController!.pushViewController(viewController, animated: false)
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
self.window!.rootViewController = navController
self.window!.backgroundColor = UIColor.whiteColor()
self.window!.makeKeyAndVisible()
return true
}ViewController中的
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
self.title = "FirstVC"
var startFinishButton = UIButton.buttonWithType(UIButtonType.System) as! UIButton
startFinishButton.frame = CGRectMake(100, 100, 100, 50)
startFinishButton.backgroundColor = UIColor.greenColor()
startFinishButton.setTitle("Test Button", forState: UIControlState.Normal)
startFinishButton.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)
self.view.addSubview(startFinishButton)
}
func buttonAction(sender:UIButton!)
{
println("Button tapped")
let vc = SecondViewController()
self.navigationController?.pushViewController(vc, animated: true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/30956476
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