Question

我尝试创建一个按钮，在突出显示时将其背景颜色更改为标题标签的背景颜色，标题标签将其颜色更改为白色。我的代码是这样的：

import UIKit

class AlertStyleButton: UIButton {

    var buttonColor: UIColor?

    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setup()
    }

    func setup() {
        buttonColor = titleColor(for: .normal)
    }

    override var isHighlighted: Bool {
        didSet {
            guard let buttonColor = buttonColor else {
                return
            }
            if isHighlighted {
                UIView.animate(withDuration: 0.1, animations: {
                    self.setTitleColor(UIColor.white, for: UIControlState())
                    self.backgroundColor = buttonColor
                })
            } else {
                UIView.animate(withDuration: 0.1, animations: {
                    self.setTitleColor(buttonColor, for: UIControlState())
                    self.backgroundColor = UIColor.white
                })
            }
        }
    }


}

按下按钮时按钮颜色似乎正确动画。但是，文本不会为白色设置动画。我在这里做错了什么？

Answer 1

要设置UIButton的标题颜色，您需要明确使用setTitleColor: forState:方法。例如：

var buttonTextColor: UIColor!
var buttonBgColor: UIColor!

override init(frame: CGRect) {
    super.init(frame: frame)
    setup()
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    setup()
}

func setup() {
    buttonBgColor = UIColor.white // set whatever color you like
    buttonTextColor = UIColor.black // set whatever color you like
    backgroundColor = buttonBgColor
    setTitleColor(buttonTextColor, for: .normal)
    setTitleColor(buttonBgColor, for: .highlighted)
}

override var isHighlighted: Bool {
    didSet {
        if isHighlighted {
            UIView.animate(withDuration: 0.1, animations: {
                self.backgroundColor = self.buttonTextColor
            })
        } else {
            UIView.animate(withDuration: 0.1, animations: {
                self.backgroundColor = self.buttonBgColor
            })
        }
    }
}

标题标签文本颜色在UIButton中无法正确显示动画

1 个答案: