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我已经在组件上添加了渐变,它处于一个角度。该梯度不垂直于梯度矢量。设备iPhone 6s,为了方便,已经设置了大小不变。可能是什么问题呢?iOS渐变不垂直于渐变矢量
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let topPoint = CGPoint(x: 33, y: -55)
let botPoint = CGPoint(x: 217, y: 469)
let iPhoneSize = CGSize(width: 375, height: 667)
let additionalLayer = CAGradientLayer()
additionalLayer.frame = view.bounds
additionalLayer.startPoint = CGPoint(x: topPoint.x/iPhoneSize.width, y: topPoint.y/iPhoneSize.height)
additionalLayer.endPoint = CGPoint(x: botPoint.x/iPhoneSize.width, y: botPoint.y/iPhoneSize.height)
additionalLayer.colors = [UIColor.white.cgColor, UIColor.darkGray.cgColor, UIColor.black.cgColor]
additionalLayer.locations = [0.0, 0.468, 1.0]
drawLine(onLayer: additionalLayer, fromPoint: topPoint, toPoint: botPoint)
view.layer.addSublayer(additionalLayer)
}
func drawLine(onLayer layer: CALayer, fromPoint start: CGPoint, toPoint end: CGPoint) {
let line = CAShapeLayer()
let linePath = UIBezierPath()
linePath.move(to: start)
linePath.addLine(to: end)
line.path = linePath.cgPath
line.fillColor = nil
line.opacity = 1.0
line.strokeColor = UIColor.red.cgColor
layer.addSublayer(line)
}
}
附:我已经尝试将此代码添加到viewDidLayoutSubviews()
P.P.S.还添加了截图。
哎呦......我的答案是不正确的。这里是(我相信)你在找什么:https://stackoverflow.com/a/43176174/6257435 – DonMag