问题
I have 2 view controllers. 1: Login page(Main View Controller) 2:Sign Up page.Lets assume that I want to go back from Sign Up page to Login page . How to solve this problem(with Navigation Controller), I am new in swift and iOS . Here is my code in AppDelegate.swift.
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
self.window?.backgroundColor = UIColor.whiteColor()
self.window?.rootViewController = ViewController()
self.window?.makeKeyAndVisible()
return true
}
回答1:
Embed-In navigation controller programmatically
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
UINavigationBar.appearance().backgroundColor = UIColor.whiteColor()
let loginViewController: LoginViewController = LoginViewController(nibName: "LoginViewController", bundle: nil)
let navController: UINavigationController = UINavigationController(rootViewController: loginViewController)
window!.makeKeyAndVisible()
window!.addSubview(navController.view!)
return true
}
Embed-In navigation controller Using Storyborad
To enable navigation controller you need to embed-in your loginViewController in Navigation controller
Open Storyboard --> select loginviewcontroller --> Editor (in Xcode menu) --> Embed in --> Navigation controller
you can see result looks like
then just update app delegate method to change the navigation bar background color
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
UINavigationBar.appearance().backgroundColor = UIColor.whiteColor()
return true
}
In LoginViewController controller add Right swipe gesture in viewDidLoad
override func viewDidLoad() {
super.viewDidLoad()
let swiperight: UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(LoginViewController.swiperight(_:)))
swiperight.direction = .Right
self.view!.addGestureRecognizer(swiperight)
}
func swiperight(gestureRecognizer: UISwipeGestureRecognizer) {
//Do what you want here
//Load Signup view controller here
func swiperight(gestureRecognizer: UISwipeGestureRecognizer) {
//Load Signup view controller here
let signupHomeViewController: SignupHomeViewController = SignupHomeViewController(nibName: nil, bundle: nil)
// and push it onto the 'navigation stack'
self.navigationController?.pushViewController(signupHomeViewController, animated: true)
}
}
In SignupViewController controller add Left swipe gesture in viewDidLoad
override func viewDidLoad() {
super.viewDidLoad()
let swipeleft: UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self, action: #selector(SignupViewController.swipeleft(_:)))
swipeleft.direction = .Left
self.view!.addGestureRecognizer(swipeleft)
}
func swipeleft(gestureRecognizer: UISwipeGestureRecognizer) {
//Do what you want here
//Pop back to login view controller
}
回答2:
As per your question i think you have already created the login page, Sign Up page and is able to navigate to Sign Up page. Since you are using Navigation Controller you must be using push to viewcontroller. You can add a barbutton on left, define a action on it as below
var b = UIBarButtonItem( title: "Back To Login", style: .Plain, target: self, action: "backToLogin:" )
func backToLogin(sender: UIBarButtonItem) {
self.navigationController?.popViewControllerAnimated(true)
}
For swipe functionalty:
var leftGesture = UISwipeGestureRecognizer(target: self, action: Selector("swipeToLogin:"))
leftGesture.direction = .Left
self.view.addGestureRecognizer(leftGesture)
func swipeToLogin(sender:UISwipeGestureRecognizer) {
self.navigationController?.popViewControllerAnimated(true)
}
来源：https://stackoverflow.com/questions/36217525/go-back-to-previous-view-controller-with-help-of-swipe-back-to-the-left