ios Swift：如何在登录视图后显示标签栏控制器
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Swift: how to show a tab bar controller after a login view
提问by SagittariusA
I have seen many posts similar to this here but they are all about Objective-C while I am developing my app in Swift. As you can see from the image I have a login screen view and I correctly implemented the login mechanism.
我在这里看到过很多与此类似的帖子，但它们都是关于 Objective-C 的，而我正在 Swift 中开发我的应用程序。正如您从图像中看到的，我有一个登录屏幕视图，并且我正确地实现了登录机制。
Now I would like that when the login has succedeed, then the tab bar controller is showed. In my login view controller I have this function for login:
现在我希望在登录成功后显示标签栏控制器。在我的登录视图控制器中，我有这个登录功能：
var finalURL:NSString = "\(Settings.webServerLoginURL)?username=\(username)&password=\(password)"
LoginService.requestLoginWithURL(NSURL(string: finalURL as String)!, completionHandler: { (success) -> Void in
if (success) {
NSLog("Login OK")
/* Scarica dal database i tasks di LoggedUser.id */
/* Redirect al tab HOME dell'applicazione dove si mostrano il numero di task
di quell'utente ed in cima "BENVENUTO: name surname" */
}
else {
self.alertView.title = "Autenticazione fallita!"
self.alertView.message = "Username o passowrd."
self.alertView.delegate = self
self.alertView.addButtonWithTitle("OK")
self.alertView.show()
}
So I think that I should show tab bar controller after
所以我认为我应该在之后显示标签栏控制器
NSLog("Login OK")
but I don't know how. I am a beginner of Swift/XCode...if you can explain me. Thanks to all who have read.
但我不知道怎么做。我是 Swift/XCode 的初学者……如果你能解释一下。感谢所有阅读过的人。
回答by Dev
To show tab bar controller from Login page, connect the Login page and TabbarController with a Show segue and give it an identifier in attributes inspector (Say "mySegueIdentifier").
要从登录页面显示标签栏控制器，请将登录页面和 TabbarController 与 Show segue 连接起来，并在属性检查器中为其指定一个标识符（比如“mySegueIdentifier”）。
To add segue, just right click and drag from Login view controller to TabbarController.
要添加转场，只需右键单击并从登录视图控制器拖动到 TabbarController。
In successful Login you can simply call "performSegueWithIdentifier" method as follows
在成功登录后，您可以简单地调用“performSegueWithIdentifier”方法如下
self.performSegueWithIdentifier("mySegueIdentifier", sender: nil)
In your case you call it after this line.
在您的情况下，您在此行之后调用它。
NSLog("Login OK")
If you don't want to navigate from Login page to TabbarController, you can also set it as rootViewController after successful Login. To do this, set an identifier to TabbarController (Say "myTabbarController")
如果您不想从登录页面导航到 TabbarController，您也可以在登录成功后将其设置为 rootViewController。为此，请为 TabbarController 设置一个标识符（比如“myTabbarController”）
let appDelegate = UIApplication.sharedApplication().delegate! as! AppDelegate
var initialViewController = self.storyboard!.instantiateViewControllerWithIdentifier("myTabbarControllerID") as! UIViewController
appDelegate.window?.rootViewController = initialViewController
appDelegate.window?.makeKeyAndVisible()
Edit:
编辑：
Swift 3
斯威夫特 3
let appDelegate = UIApplication.shared.delegate! as! AppDelegate
let initialViewController = self.storyboard!.instantiateViewController(withIdentifier: "myTabbarControllerID")
appDelegate.window?.rootViewController = initialViewController
appDelegate.window?.makeKeyAndVisible()
Happy coding.. :)
快乐编码.. :)
回答by Brian
I ran into this same issue when trying to segue from a controller I used for touchID to a TabBarController. By making the segue in an async block I resolved the issue.
我在尝试从用于 touchID 的控制器转到 TabBarController 时遇到了同样的问题。通过在异步块中进行转场，我解决了这个问题。
dispatch_async(dispatch_get_main_queue(), {
self.dismissViewControllerAnimated(false, completion: {})
self.performSegueWithIdentifier("authnToAppSegue", sender: nil)
})
回答by S.S.D
Give your tab bar controller a StoryboardID (say "tabbar") and push it just like a normal UIViewController:
给你的标签栏控制器一个 StoryboardID（比如“tabbar”）并像普通的 UIViewController 一样推送它：
let nextViewController = self.storyboard?.instantiateViewController(withIdentifier: "tabbar") as! UIViewController
self.navigationController?.pushViewController(nextViewController, animated: true)
回答by Kristijan Delivuk
func setTabBarVisible(visible:Bool, animated:Bool) {
//* This cannot be called before viewDidLayoutSubviews(), because the frame is not set before this time
// bail if the current state matches the desired state
if (tabBarIsVisible() == visible) { return }
// get a frame calculation ready
let frame = self.tabBarController?.tabBar.frame
let height = frame?.size.height
let offsetY = (visible ? -height! : height)
// zero duration means no animation
let duration:NSTimeInterval = (animated ? 0.3 : 0.0)
// animate the tabBar
if frame != nil {
UIView.animateWithDuration(duration) {
self.tabBarController?.tabBar.frame = CGRectOffset(frame!, 0, offsetY!)
return
}
}
}
func tabBarIsVisible() ->Bool {
return self.tabBarController?.tabBar.frame.origin.y < CGRectGetMaxY(self.view.frame)
}
// Call the function from tap gesture recognizer added to your view (or button)
@IBAction func tapped(sender: AnyObject) {
setTabBarVisible(!tabBarIsVisible(), animated: true)
}
回答by Upendranath Reddy
Call the Tabbarcontroller from any controller By below Code, default first item is selected
从任何控制器调用 Tabbarcontroller 通过下面的代码，默认选择第一项
let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let nextViewController = storyBoard.instantiateViewController(withIdentifier: "HomeTabBar") as! UITabBarController
self.navigationController?.pushViewController(nextViewController, animated: true)
