我有一个导航视图控制器，在操作时将一个segue发送到标签栏视图控制器 . 由于此segue，选项卡式视图控制器继承导航栏 . 我正在尝试将 Headers 应用于附加到标签栏视图控制器的我的一个视图控制器，但是通过代码设置 Headers 对我来说不起作用 . 有谁知道原因可能是什么？
这是我的故事板的图片：
带有注销按钮的视图控制器是我试图在导航栏（代码）中设置 Headers 的地方：
import UIKit
class ProfileSettingsViewController: UIViewController {
override func viewWillAppear(animated: Bool) {
self.navigationItem.title = "Profile Settings"
}
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.leftBarButtonItem = nil
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func logoutButton(sender: AnyObject) {
PFUser.logOut()
var currentUser = PFUser.currentUser()
self.performSegueWithIdentifier("userLoggedOut", sender: self)
self.navigationController?.setNavigationBarHidden(self.navigationController?.navigationBarHidden == false, animated: true)
}
}
嵌入导航控制器的视图控制器触发到标签栏控制器的segue：
import UIKit
class UserRegistrationViewController: UIViewController {
func displayAlert(title:String, error:String) {
var alert = UIAlertController(title: title, message: error, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: {
action in
}))
self.presentViewController(alert, animated: true, completion: nil)
}
@IBOutlet var usernameTextField: UITextField!
@IBOutlet var emailTextField: UITextField!
@IBOutlet var passwordTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func registerUser(sender: AnyObject) {
var error = ""
if usernameTextField.text == nil || emailTextField.text == nil || passwordTextField.text == nil {
error = "Please enter a username, email and password"
}
if error != "" {
displayAlert("Error In Form", error: error)
} else {
var user = PFUser.currentUser()
user.username = usernameTextField.text
user.password = passwordTextField.text
user.email = emailTextField.text
user.saveInBackgroundWithBlock {
(succeeded: Bool!, signupError: NSError!) -> Void in
if signupError == nil {
println(user.username)
println(user.password)
println(user.email)
self.performSegueWithIdentifier("successfulRegistration", sender: self)
self.navigationController?.setNavigationBarHidden(self.navigationController?.navigationBarHidden == false, animated: true)
// Hooray! Let them use the app now.
} else {
if let errorString = signupError.userInfo?["error"] as? NSString {
error = errorString
} else {
error = "Please try again later."
}
self.displayAlert("Could Not Sign Up", error: error)
}
}
}
}
}
5 回答
这对我有用：
self.parent?.title = "nav bar title"在视图控制器层次结构中，导航栏显示
UITabBarController的 Headers ，而不是UITabBarController中的视图控制器 .在导航栏中显示 Headers 的最简单方法是
在Logout Screen viewcontroller中添加以下内容 -
SWIFT 3
如果嵌入在UINavigationController中，您可以在ViewController的viewDidLoad（）方法中设置如下 Headers .
试试这个：