UIBarButtonItem 以编程方式改变颜色

Question

我有这个左 UIBarButtonItem，它的功能就像一个开关，所以我想在它关闭时将其设为灰色，而在它打开时将其设为正常色调，但我不知道如何实现

这是用于分配按钮的代码：

    doneHomeworksButton = UIBarButtonItem(image: doneHomeworksButtonImage, style: .plain, target: self, action: #selector(doneHomeworksClicked))
    addButton = UIBarButtonItem(image: plusButtonImage, style: .plain, target: self, action: #selector(plusButtonClicked))

    self.navigationItem.rightBarButtonItem = addButton
    self.navigationItem.leftBarButtonItem = doneHomeworksButton

这是模拟器（我要换左键）

Answer 1

就是这样，我用文字代替图标。您可以使用 fontawesome 或任何其他的 FM 符号。您还可以在单击按钮时更改图像

class ViewController: UIViewController{


var btnTick:UIBarButtonItem?


override func viewDidLoad() {
    super.viewDidLoad()
    view.backgroundColor = .white
    btnTick  = UIBarButtonItem(title: "2", style: .plain, target: self, action: #selector(didClickedBtn(_ :)))
    btnTick?.tintColor = .blue
    navigationItem.leftBarButtonItem = btnTick
}

@objc func didClickedBtn(_ sender : UIBarButtonItem){
    sender.tintColor = .red
    view.layoutIfNeeded()
}

}

UIBarButtonItem 以编程方式改变颜色

UIBarButtonItem programmatically change color

swift

swift5

xcode11