快速更改分段开关上的分段控件标题颜色

Question

我有一个视图控制器，在其上我具有片段控制，并且我可以通过滑动手势切换片段，现在我希望当我切换片段时，当前片段标题颜色应变为白色，而其余颜色应变为灰色，我已经进行了搜索，但是我得到了背景颜色更改的结果，如何在段之间切换时更改段控件标题颜色？这是我的细分代码，

 let titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.red]
    segmentControl.setTitleTextAttributes(titleTextAttributes, for: .selected)
    segmentControl.fallBackToPreIOS13Layout(using: UIColor.clear)
    let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(self.swipedRight))
    swipeRight.direction = UISwipeGestureRecognizer.Direction.right
    self.activeView.addGestureRecognizer(swipeRight)

    let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(self.swipedLeft))
    swipeLeft.direction = UISwipeGestureRecognizer.Direction.left
    self.closedView.addGestureRecognizer(swipeLeft)

 @objc func swipedRight(){
    segmentControl.selectedSegmentIndex = 0
    self.activeView.isHidden = false
    self.closedView.isHidden = true
    let titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white]
    segmentControl.setTitleTextAttributes(titleTextAttributes, for: .selected)
    let titleText = [NSAttributedString.Key.foregroundColor: UIColor.gray]
    segmentControl.setTitleTextAttributes(titleText, for: .disabled)

    getActiveQuestionAPI()
}

@objc func swipedLeft(){
    segmentControl.selectedSegmentIndex = 1
    self.activeView.isHidden = true
    self.closedView.isHidden = false
    let titleTextAttributes = [NSAttributedString.Key.foregroundColor: UIColor.white]
    segmentControl.setTitleTextAttributes(titleTextAttributes, for: .selected)
    let titleText = [NSAttributedString.Key.foregroundColor: UIColor.gray]
    segmentControl.setTitleTextAttributes(titleText, for: .disabled)

    getCloseQuestionAPI()
}

Answer 1

您所做的一切都很好，只不过您已为状态

。disabled设置了灰色的前景色属性。您应该为状态。normal设置该值。请尝试如下设置。normal状态。

let titleText = [NSAttributedString.Key.foregroundColor: UIColor.gray]
segmentControl.setTitleTextAttributes(titleText, for: .normal)

Answer 2

用于检查段控制值何时更改，可以使用像这样的addTarget方法。

segmentControl.addTarget(self, action: #selector(onSegmentedControlValueChanged(_:)), for: .valueChanged)

然后像以前的方法一样实现onSegmentedControlValueChanged：
@objc func onSegmentedControlValueChanged(_ sender: UISegmentedControl) {
  // Do something when segment control value changes
}

对于更改段控件的标题文本，您实际上不必检查值何时更改，只需通过以下代码片段即可实现：
let titleTextAttributesForSelected = [NSAttributedString.Key.foregroundColor: UIColor.white]
let titleTextAttributesForNormal = [NSAttributedString.Key.foregroundColor: UIColor.black]
segmentControll.setTitleTextAttributes(titleTextAttributesForSelected, for: .selected)
segmentControll.setTitleTextAttributes(titleTextAttributesForNormal, for: .normal)

这是更改不同状态的段控件标题颜色所需的全部。