ios - UIButton 子类来设置按钮 Xcode/Swift 的高度

Question

我创建了一个 UIButton 子类来为一批按钮添加渐变层，我想知道是否有办法设置按钮的高度，因为它们的高度都相同。这是我的渐变层代码，所以我想知道它是否可行以及我需要将它放在代码中的什么位置:

public class GradientButton: UIButton {

override public func layoutSubviews() {
    super.layoutSubviews()
    createGradientBackground()

}  
 func createGradientBackground() {

    let gradientLayer = CAGradientLayer()
    gradientLayer.frame = self.layer.bounds

    let color1 = UIColor(red:0.05, green:0.29, blue:0.49, alpha:1.0).CGColor as CGColorRef
    let color2 = UIColor(red:0.08, green:0.23, blue:0.39, alpha:1.0).CGColor as CGColorRef

    gradientLayer.colors = [color1, color2]

    gradientLayer.locations = [0.0, 1.0]

    self.layer.insertSublayer(gradientLayer, atIndex: 0)
    }
}

Answer 1

当然，只需添加:

init() {
    self.frame.size.height = 50.0
    //Do other stuff you may want
}

或者:

func createGradientBackground() {

    let gradientLayer = CAGradientLayer()
    gradientLayer.frame = self.layer.bounds

    let color1 = UIColor(red:0.05, green:0.29, blue:0.49, alpha:1.0).CGColor as CGColorRef
    let color2 = UIColor(red:0.08, green:0.23, blue:0.39, alpha:1.0).CGColor as CGColorRef

    gradientLayer.colors = [color1, color2]

    gradientLayer.locations = [0.0, 1.0]

    self.layer.insertSublayer(gradientLayer, atIndex: 0)

    //set custom height wanted 
    self.frame.size.height = 50.0
}

您可以在自定义 init() 中或在您的 createGradientBackground() 中执行此操作。但是，您必须牢记在 Storyboard 中对按钮设置的限制。