I need to change UINavigationBar back bar button text from AppDelegate to apply changes to all the Views in my app.
I've changed the title font style using:
UINavigationBar.appearance().titleTextAttributes = [
NSFontAttributeName: UIFont(name: "MyCustomFont", size: 20)!
]
But I don't know how to access to the left bar button to make changes on it.
Swift 3.0,4.0
Simply you can achieve it with extension of UINavigationItem. According to many search there is no way to change left button text with app delegate.
extension UINavigationItem{
override open func awakeFromNib() {
super.awakeFromNib()
let backItem = UIBarButtonItem()
backItem.title = "Hello"
if let font = UIFont(name: "Copperplate-Light", size: 32){
backItem.setTitleTextAttributes([NSFontAttributeName:font], for: .normal)
}else{
print("Font Not available")
}
/*Changing color*/
backItem.setTitleTextAttributes([NSForegroundColorAttributeName: UIColor.green], for: .normal)
self.backBarButtonItem = backItem
}
}
Update:
You can change Back Button arrow colour from AppDelegate on didFinishLaunchingWithOptions,
/*It will change back arrow color only if you use backItem.setTitleTextAttributes, else it will change whole text color*/
UINavigationBar.appearance().tintColor = UIColor.orange
To change the image color you can either use the font file and change the color or use the image with the color you needed.
let yourBackButtonIcon = //YourImage here
let navigationBar = UINavigationBar.appearance()
navigationBar.backIndicatorImage = yourBackButtonIcon
navigationBar.backIndicatorTransitionMaskImage = yourBackButtonIcon
To change the back button title text color
navigationBar.titleTextAttributes = [NSFontAttributeName: yourFont,
NSForegroundColorAttributeName: yourColor]
Note:-
Above code should be inside the
AppDelegateclass ofapplicationDidFinishLaunchingmethod
Try this:
Subclass the UINavigationController and use it. Then make your viewDidLoad like so: (change the attributes according to your need)
//
// NavConViewController.swift
// customattributedbackbtn
//
// Created by Glenn Posadas on 8/12/17.
// Copyright © 2017 Glenn Posadas. All rights reserved.
//
import UIKit
class NavConViewController: UINavigationController {
override func viewDidLoad() {
super.viewDidLoad()
let font = UIFont(name: "Helvetica-Light", size: 12)!
var attributes: [String : Any] = [NSFontAttributeName : font]
attributes[NSForegroundColorAttributeName] = UIColor.black
UIBarButtonItem.appearance(whenContainedInInstancesOf: [UINavigationBar.self, NavConViewController.self]).setTitleTextAttributes(attributes, for: .normal)
}
}
Sample output:
Default
Attributed
This should help you
UIBarButtonItem.appearance().setTitleTextAttributes([NSFontAttributeName: UIFont(name: "MyCustomFont", size: 20)!], for: .normal)
