iOS 自定义导航栏后退按钮标题在点击时消失 [英] iOS Custom Navigation bar back button title disappears on tapping

问题描述

你好 StackOverflow 社区，

Hello StackOverflow community,

我有一个相当奇怪的案例，我的导航控制器导航栏上的自定义后退按钮在交互时消失了.

I have a rather curious case of a customized back button on my navigation controller's navigation bar disappearing on interaction.

一些额外的信息是我的代码没有使用 Storyboard 而我使用的是 UIKit - 包括 UI 在内的一切都是以编程方式构建的.

Some additional information is that my code is not using Storyboard and I use UIKit - everything including the UI has been build programatically.

这是我的设置:

• 我首先创建一个自定义 UINavigationController 子类来抽象我所有与导航控制器相关的自定义

• I start with creating a custom UINavigationController subclass to abstract away all of my navigation controller related customizations

在这个子类中，我调用了这个方法来自定义后退按钮的外观

Within this subclass, I have this method that get's called to customized the appearance of my back button

private func customizeBackButton() {
    let backImage = UIImage(named: "BackButton")?.withRenderingMode(.alwaysOriginal)
    navigationBar.backIndicatorImage = backImage
    navigationBar.backIndicatorTransitionMaskImage = backImage
    
    UIBarButtonItem.appearance().setTitleTextAttributes([
      NSAttributedString.Key.foregroundColor: UIColor.panoStoryYellow,
      NSAttributedString.Key.font: UIFont(name: "Montserrat-SemiBold", size: 15)!
    ], for: .normal)
}

• 上述定制，给出了以下结果，这是我想要的，画廊是我上一个屏幕的标题
• 当我点击箭头所在的后退按钮的最左侧边缘时，该按钮正常工作.但是，如果我点击后退按钮的标签部分(图库文本所在的位置)，文本就会消失并使用户保持在同一屏幕上.

当我在标签消失后点击后退箭头时，它会工作并带我回到上一个屏幕，但是，为什么会发生这种消失?

When I tap on the back arrow after the label disappears, it works and takes me back to the previous screen, however, why would this disappearance occur ?

我尝试了什么我已经尝试了很多关于堆栈溢出的建议，例如:

What have I tried I have tried many suggestions on stack overflow such as:

• 确保我的代码中没有一行明确隐藏后退按钮
• 随时检查前一屏幕的标题为空字符串

我可以确认这些不是问题，因为我有一个有效的标题并且从不隐藏后退按钮.

I can confirm that these are not the issue as I have a valid title and never hide the back button.

以下是我在决定它们都不适用于我的案例之前检查过的一些资源，我在这里提出了问题:

Here are some resources I have checked before deciding that none of them work for my case and I asked the question on here:

UINavigationController 后退按钮不可见，但有效

UINavigationController 的后退按钮消失了?

使用自定义后退按钮后导航标题消失

当返回按钮时，前一屏幕上的导航标题消失按下

缺少导航或后退按钮的标题何时连续推送 ViewControllers

关于为什么这个后退按钮文本消失的任何想法?

Any ideas as to why this back button text disappears ?

推荐答案

所以经过大量的反复试验，这似乎对我有用.

So after a lot of trial and error, this is what seemed to have worked for me.

我什至需要指定 highlighted 状态的属性.

I needed to even specify what the attributes are of the highlighted state.

UIBarButtonItem.appearance().setTitleTextAttributes([
      NSAttributedString.Key.foregroundColor: UIColor.panoStoryYellow,
      NSAttributedString.Key.font: UIFont(name: "Montserrat-SemiBold", size: 15)!
], for: .highlighted)

此后，文本再也没有消失，一切都按预期进行.

After this, the text never disappeared and everything worked as intended.

我暂时不将此标记为答案，因为也许有人有更好的权利"方法来做到这一点.

I am not marking this as the answer for now as perhaps someone has a better "right" way to do this.

无论如何，如果其他人可能面临类似的情况，我会将这个答案放在这里.

In any case I am putting this answer here if anyone else might be facing a similar scenario.

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