UILabel 文字渐变色

image.png

工具类方法

 extension UILabel {
    func setGradientTextColor(startColor: UIColor, endColor: UIColor, startPoint: CGPoint, endPoint: CGPoint) {
        let gradientLayer = CAGradientLayer()
        gradientLayer.frame = bounds
        gradientLayer.colors = [startColor.cgColor, endColor.cgColor]
        gradientLayer.startPoint = startPoint
        gradientLayer.endPoint = endPoint
        
        let renderer = UIGraphicsImageRenderer(size: gradientLayer.bounds.size)
        let gradientImage = renderer.image { context in
            gradientLayer.render(in: context.cgContext)
        }
        
        textColor = UIColor(patternImage: gradientImage)
    }
}

使用

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 50))
        label.text = "Hello, World!"
        label.textAlignment = .center
        label.font = UIFont.boldSystemFont(ofSize: 20)
        label.setGradientTextColor(startColor: .red,
                                   endColor: .blue,
                                   startPoint: CGPoint(x: 0, y: 0),
                                   endPoint: CGPoint(x: 0, y: 1))
        view.addSubview(label)
        
    }
}