如何在Swift中根据背景图像调整文本标签颜色

import UIKit

extension UIImage {
    func getPixelColor(at point: CGPoint) -> UIColor? {
        guard let cgImage = self.cgImage else { return nil }
        let pixelData = cgImage.dataProvider?.data
        let data: UnsafePointer<UInt8> = CFDataGetBytePtr(pixelData)
        let pixelInfo: Int = ((Int(self.size.width) * Int(point.y)) + Int(point.x)) * 4
        let red = CGFloat(data[pixelInfo]) / 255.0
        let green = CGFloat(data[pixelInfo+1]) / 255.0
        let blue = CGFloat(data[pixelInfo+2]) / 255.0
        let alpha = CGFloat(data[pixelInfo+3]) / 255.0
        return UIColor(red: red, green: green, blue: blue, alpha: alpha)
    }
}

extension UIColor {
    func isLightColor() -> Bool {
        guard let components = self.cgColor.components else { return false }
        let brightness = ((components[0] * 299) + (components[1] * 587) + (components[2] * 114)) / 1000
        return brightness >= 0.5
    }
}

// 在你的视图控制器中使用以下代码

let backgroundImage = UIImage(named: "background.jpg")
let pixelColor = backgroundImage?.getPixelColor(at: CGPoint(x: 0, y: 0))

if let color = pixelColor {
    let labelColor = color.isLightColor() ? UIColor.black : UIColor.white
    yourLabel.textColor = labelColor
}