快速更改后退按钮的字体和颜色

I am developing an app in Swift 2.2. Now I want to change the back button font and color for a certain view. The view in question has a navigation controller as it's parent controller.

我正在开发Swift 2.2中的应用程序。现在我想更改某个视图的后退按钮字体和颜色。有问题的视图有一个导航控制器作为它的父控制器。

I've tried running both of the following lines in viewDidLoad of my ViewController

我已尝试在ViewController的viewDidLoad中运行以下两行

self.navigationController!.navigationItem.backBarButtonItem!.setTitleTextAttributes([NSFontAttributeName: UIFont(name: "Andes Rounded", size: 17)!], forState: .Normal)
self.navigationItem.backBarButtonItem!.setTitleTextAttributes([NSFontAttributeName: UIFont(name: "Andes Rounded", size: 17)!], forState: .Normal)

Neither throws any errors, but it doesn't make any difference to the back button. I've also tried running both of these

不会抛出任何错误，但它对后退按钮没有任何影响。我也试过运行这两个

self.navigationController!.navigationItem.leftBarButtonItem!.setTitleTextAttributes([NSFontAttributeName: UIFont(name: "Andes Rounded", size: 17)!], forState: .Normal)   
self.navigationItem.leftBarButtonItem!.setTitleTextAttributes([NSFontAttributeName: UIFont(name: "Andes Rounded", size: 17)!], forState: .Normal)

This however throws an error (error unwrapping nil). How should I change the font and color of the nav bar back button correctly? Feels like I'm not modifying the right items...

然而，这会引发错误（错误展开nil）。我该如何正确更改导航栏后退按钮的字体和颜色？感觉就像我没有修改正确的物品......

6 个解决方案

#1

If you want to set same color to bar buttons implicitly then in your appdelegate in didfinishlaunchingwithoption write,

如果你想隐式设置相同的颜色到条形按钮，那么在你的appdelegate中的didfinishlaunchingwithoption写入，

 UINavigationBar.appearance().tintColor = UIColor.whiteColor() //your desired color here

Update :

更新：

put this in appdelegae,

把它放在appdelegae中，

 UIBarButtonItem.appearance().setTitleTextAttributes([NSFontAttributeName: UIFont(name: "Andes Rounded", size: 17)!], forState: .Normal) // your textattributes here

Update 2 :

更新2：

  UIBarButtonItem.appearanceWhenContainedInInstancesOfClasses([UINavigationBar.classForCoder()]).setTitleTextAttributes(["attribute" : "value"], forState: .Normal)

Hope this will help :)

希望这会有所帮助:)

#2

Swift 3.0 answer (based on Lion's answer):

Swift 3.0的答案（根据Lion的回答）：

let newFont = UIFont(name: "Avenir Next", size: 16.0)!
let color = UIColor.white

UIBarButtonItem.appearance(whenContainedInInstancesOf: [UINavigationBar.classForCoder() as! UIAppearanceContainer.Type]).setTitleTextAttributes([NSForegroundColorAttributeName: color, NSFontAttributeName: newFont], for: .normal)

Works a treat, for those that have already managed to customise other parts of their nav bars but not the back button!

对于那些已经设法定制导航栏的其他部分而不是后退按钮的人来说，这是一种享受！

#3

I think you should change it in the vc before your actual vc. Look at: UINavigationItem

我认为你应该在实际的vc之前在vc中更改它。看看：UINavigationItem

Edit: For example you can write:

编辑：例如你可以写：

let item = UIBarButtonItem(title: "Text goes here", style: .Plain, target: self, action: #selector(self.navigationController?.popViewControllerAnimated(_:)))

item.setTitleTextAttributes([NSFontAttributeName: UIFont(name: "Helvetica-Bold", size: 23)!], forState: .Normal)

navigationItem.backBarButtonItem = item

in your prepareForSegue Method.

在您的prepareForSegue方法中。

#4

create custom button and make it as you want and add action to go back.

创建自定义按钮并根据需要进行设置，并添加操作以返回。

func addBackBarButtonOnNavigationBar(){
   // add image here
    let searchImage:UIImage = UIImage(named: "back button image")!

     var backBtn:UIBarButtonItem = UIBarButtonItem(image: searchImage,  style: UIBarButtonItemStyle.Plain, target: self, action: #selector(classname.buttonActionMethodName(_:)))
    backBtn.tintColor = UIColor.lightGrayColor()
  if let font = UIFont(name: "AvenirNext", size: 15) {
    backBtn.setTitleTextAttributes([NSFontAttributeName: font], forState: UIControlState.Normal)
}
    self.navigationItem.leftBarButtonItem = backBtn

}

func buttonActionMethodName(){
  self.navigationController!.popViewControllerAnimated(true)

}

#5

Use the following code:

使用以下代码：

    navigationController?.navigationBar.barTintColor = UIColor.purpleColor()
    navigationController?.navigationBar.tintColor = UIColor.whiteColor()

change colour according to your need

根据您的需要改变颜色

#6

Swift 4

斯威夫特4

in AppDelegate.swift

在AppDelegate.swift中

UIBarButtonItem.appearance().setTitleTextAttributes([NSAttributedStringKey.font: UIFont(name: "Helvetica-Bold", size: 15)!], for: .normal)

#1