Swift-5.0 中的 UIBarButtonItem 颜色设置 [英] UIBarButtonItem color setting in Swift-5.0

问题描述

我意识到我的 UIBarButtonItem(左右按钮)的颜色行为不符合预期.

I realised that the color-behaviour of my UIBarButtonItem's (left and right buttons) is not as desired.

如果我按住右侧的 UIBarButton(参见视频)，则颜色会从浅黄色变为灰色的深黄色.

If I press and hold the right UIBarButton (see video), then the color changes from light-yellow to gray'isch dark-yellow.

但是，我想要一个保持相同浅黄色的解决方案，无论选择任何按钮、按住等操作.按钮颜色应始终保持相同的浅黄色.

However, I would like a solution that keeps the same light-yellow color, no matter of any button selection, press-and-hold, etc. The button color should always stay the same light-yellow.

我怎样才能做到这一点?

How can I achieve this ?

这是在模拟器中完成的视频:(您可以清楚地看到，单击-按住会导致颜色变化.即使按住也保持浅黄色的解决方案是什么??)

Here is the video done in Simulator: (you can clearly see that click-n-hold causes a color-change. what is the solution to keep the light-yellow color even when press-and-hold ??)

代码如下:

@IBOutlet weak var btnCancel: UIBarButtonItem!
@IBOutlet weak var btnApply: UIBarButtonItem!

override func viewDidLoad() {
    super.viewDidLoad()

    btnCancel.title = "Cancel".localized
    btnApply.title = "Apply".localized
    navigationItem.title = "Filter".localized

    let attributes: [NSAttributedString.Key : Any] = [ .font: UIFont(name: "Avenir-Heavy", size: 14)!, .foregroundColor: UIColor.yellow]
    navigationItem.rightBarButtonItem?.setTitleTextAttributes(attributes, for: .normal)
    navigationItem.rightBarButtonItem?.setTitleTextAttributes(attributes, for: .selected)
    navigationItem.rightBarButtonItem?.setTitleTextAttributes(attributes, for: .highlighted)
    navigationItem.rightBarButtonItem?.setTitleTextAttributes(attributes, for: .focused)
}

推荐答案

请试试这个方法:

// MARK:- Custom BarButton Appearance
private extension YourViewController {

    func setupBarButtonAppearance() {

        let color = UIColor.yellow
        let font = UIFont(name: "Avenir-Heavy", size: 14)!

        let customAppearance = UIBarButtonItem.appearance(whenContainedInInstancesOf: [YourViewController.self])

        customAppearance.setTitleTextAttributes([
        NSAttributedString.Key.foregroundColor : color,
        NSAttributedString.Key.font : font], for: .normal)

        customAppearance.setTitleTextAttributes([
        NSAttributedString.Key.foregroundColor : color,
        NSAttributedString.Key.font : font], for: .highlighted)
    }
}

只需在 viewDidLoad() 中调用此方法

simply call this method in your viewDidLoad()

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