ios - UILabel 垂直着色为 2 种颜色

Question

是否可以使用 iOS SDK 将 UILabel 中的文本垂直着色为两种颜色，就像在图像上一样 - 上半部分为灰色，下半部分为白色？

谢谢

Answer 1

您可以尝试为标签设置带有图像的颜色，

添加如下方法

func getGradientImage(_ bounds:CGRect) -> UIImage {

    let gradientLayer = CAGradientLayer()

    gradientLayer.colors = [
        UIColor(red: 0.596, green: 0.839, blue: 0.929, alpha: 1.00).cgColor,
        UIColor(red: 0.169, green: 0.302, blue: 0.408, alpha: 1.00).cgColor
    ]

    gradientLayer.startPoint = CGPoint.zero
    gradientLayer.endPoint = CGPoint(x: 1, y: 1) // changing start and end point value you can set vertical or horizontal
    gradientLayer.locations = [0.5,1]
    gradientLayer.bounds = bounds
    UIGraphicsBeginImageContextWithOptions(gradientLayer.bounds.size, true, 0.0)

    let context = UIGraphicsGetCurrentContext()
    gradientLayer.render(in: context!)
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image!
}

并为您的标签设置颜色，例如

yourLabel.textColor = UIColor(patternImage: getGradientImage(yourLabel.bounds))