Question

我有一个继承自class的自定义UIButton。我想要完成的事情是根据按钮的启用状态（即启用或禁用）设置tintColor属性。

有没有办法实现这个目标？

这是我的班级：

class ButtonsPostMenu: UIButton
{
    override func awakeFromNib()
    {
        titleLabel?.font = UIFont(name: Font_AvenirNext_Medium, size: 14)
        tintColor = UIColor.white
    }
}

Answer 1

您可以覆盖isEnabled属性来实现此目的。 tintColor将根据按钮的isEnabled状态自动更改：

class ButtonsPostMenu:UIButton {

    //......

    override var isEnabled: Bool {
        didSet{
            if self.isEnabled {
                self.tintColor = UIColor.white
            }
            else{
                self.tintColor = UIColor.gray
            }
        }
    }

    //......

}

Answer 2

这是您的课程：添加changeStateOfButton自定义方法，用于管理UIButton

的色调颜色

class ButtonsPostMenu: UIButton
{
    override func awakeFromNib()
    {
        titleLabel?.font = UIFont(name: Font_AvenirNext_Medium, size: 14)
        tintColor = UIColor.white
    }

    func changeStateOfButton() {
       if self.isEnabled {
           self.tintColor = UIColor.red // Set your color when button is enabled 
       }
       else {
           self.tintColor = UIColor.yellow // Set your color when button is disabled
       }
  }
}

只需调用上述方法，就像根据启用/禁用UIButton设置颜色一样。

Answer 3

您可以尝试像这样复制setX(_ x: X, forState: State) API：

private class TintColorButton: UIButton {

    private var tintDict: [State.RawValue: UIColor] = [:]
    private var store: Set<AnyCancellable> = []

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

        publisher(for: \.isHighlighted).sink { [weak self] _ in self?.applyTintColor() }.store(in: &store)
        publisher(for: \.isEnabled).sink { [weak self] _ in self?.applyTintColor() }.store(in: &store)
    }

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func setTintColor(_ color: UIColor?, forState state: State) {
        tintDict[state.rawValue] = color
        applyTintColor()
    }

    private func applyTintColor() {
        tintColor = tintDict[state.rawValue] ?? tintDict[State.normal.rawValue]
    }
}

Answer 4

std::tgamma(7+1)

Answer 5

我认为图像过滤是个不错的选择。

btn.setImage(image, for: UIControl.State.normal)
btn.setImage(image.disabled, for: UIControl.State.disabled)

使用CoreImage进行图像过滤

extension UIImage{
    var disabled: UIImage?{
        let ciImage = CIImage(image: self)
        let grayscale = ciImage?.applyingFilter("CIColorControls",
                                                parameters: [ kCIInputSaturationKey: 0.0 ])
        if let gray = grayscale{
            return UIImage(ciImage: gray)
        }
        else{
            return nil
        }
    }
}

当然，在Swift 5中

UIButton tintColor用于禁用和启用状态？

5 个答案: