Swift NavigationBar 渐变与下方视图不同

Question

我在 naviBar 和下面的视图上有渐变，但颜色显示不同。有人知道为什么吗？我没有看到额外的色调。

导航栏代码：

func addGradientImageView(withColours: [UIColor] = [.amaranth, .dodgerBlue]) {
    let cgColours = withColours.map { [=11=].cgColor }
    let gradientLayer = CAGradientLayer()
    var updatedFrame = bounds
    updatedFrame.size.height += UIApplication.shared.statusBarFrame.height
    gradientLayer.frame = updatedFrame
    gradientLayer.colors = cgColours
    gradientLayer.startPoint = CGPoint(x: 0.0, y: 0.0)
    gradientLayer.endPoint = CGPoint(x: 1.0, y: 0.0)
    UIGraphicsBeginImageContext(gradientLayer.bounds.size)
    gradientLayer.render(in: UIGraphicsGetCurrentContext()!)
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    setBackgroundImage(image, for: UIBarMetrics.default)
}

查看代码：

func applyHorizontalGradient(withColours: [UIColor] = [.amaranth, .dodgerBlue]) {
    let cgColours = withColours.map { [=12=].cgColor }
    let grad = CAGradientLayer()
    grad.startPoint = CGPoint(x: 0, y: 0)
    grad.endPoint = CGPoint(x: 1, y: 0)
    grad.frame = self.bounds
    grad.colors = cgColours
    self.layer.insertSublayer(grad, at: 0)
}

Answer 1

extension UIView {

func applyGradientImage(withColours: [UIColor] = [.amaranth, .dodgerBlue],
                        startPoint: CGPoint = CGPoint(x: 0, y: 0),
                        endPoint: CGPoint = CGPoint(x: 1, y: 0)) {
    let imageView = ImageView()
    insertSubview(imageView, at: 0)
    imageView.expandToSuperviewSafearea(withoutBottomSafeArea: false)
    imageView.image = gradientImage(withColours: withColours, startPoint: startPoint, endPoint: endPoint)
}
}

Swift NavigationBar 渐变与下方视图不同

Swift NavigationBar gradient different than on view below

gradient

uinavigationbar

ios

swift