Swift-导航视图控制器未显示标题 [英] Swift - Title Not Appearing for Navigation View Controller
问题描述
我有一个导航视图控制器，该控制器在执行操作时会将标签发送到选项卡视图控制器.因此，选项卡式视图控制器继承了导航栏.我正在尝试将标题应用于附加到标签栏视图控制器的其中一个视图控制器，但是通过代码设置标题对我来说不起作用.有人知道为什么会这样吗?
I have a navigation view controller that upon action sends a segue to a tab bar view controller. Because of this segue the tabbed view controller inherits the navigation bar. I am trying to apply a title to one of my view controllers attached to the tab bar view controller, but setting the title via code is not working for me. does anyone know the reason why that could be?
这是我的故事板的图片:
Here is a picture of my storyboard:
我尝试在导航栏(代码)中设置标题的地方是带有注销按钮的视图控制器:
The view controller with the logout button is where I am trying to set the title in the nav bar (code):
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)
}
}
嵌入在导航控制器中的视图控制器触发对标签栏控制器的选择:
View controller embedded in the navigation controller triggering the segue to the tab bar controller:
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)
}
}
}
}
}
推荐答案
这对我有用: self.parent?.title =导航栏标题"
这篇关于Swift-导航视图控制器未显示标题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
