ios - iOS Swift和ObjC中的'blendedColorWithFraction:ofColor:'

我有一个简单的渐变:2种颜色，1个位置。但这会吐出无法在UIColors上运行的代码:

let gradient = CGGradientCreateWithColors(CGColorSpaceCreateDeviceRGB(), [gradientColor2.CGColor, gradientColor2.blendedColorWithFraction(0.5, ofColor: gradientColor).CGColor, gradientColor.CGColor], [0.14, 0.5, 1])!

最佳答案

如果您不想使用StyleKit，这是方法的实现:

extension UIColor {
    func blendedColorWithFraction(fraction: CGFloat, ofColor color: UIColor) -> UIColor {
        var r1: CGFloat = 1.0, g1: CGFloat = 1.0, b1: CGFloat = 1.0, a1: CGFloat = 1.0
        var r2: CGFloat = 1.0, g2: CGFloat = 1.0, b2: CGFloat = 1.0, a2: CGFloat = 1.0

        self.getRed(&r1, green: &g1, blue: &b1, alpha: &a1)
        color.getRed(&r2, green: &g2, blue: &b2, alpha: &a2)

        return UIColor(red: r1 * (1 - fraction) + r2 * fraction,
            green: g1 * (1 - fraction) + g2 * fraction,
            blue: b1 * (1 - fraction) + b2 * fraction,
            alpha: a1 * (1 - fraction) + a2 * fraction);
    }
}

关于ios - iOS Swift和ObjC中的'blendedColorWithFraction:ofColor:'，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/36363989/