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CoreGraphics draw a line with gradient and lineCap
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| class GradientLineView: UIView { | |
| override func draw(_ rect: CGRect) { | |
| if let context = UIGraphicsGetCurrentContext() { | |
| let startPoint1 = CGPoint(x: 20, y: rect.height/2) | |
| let endPoint1 = CGPoint(x: rect.width-120, y: rect.height/2) | |
| context.setLineWidth(15) | |
| context.move(to: startPoint1) | |
| context.addLine(to: endPoint1) | |
| context.setLineCap(.round) | |
| context.setStrokeColor(UIColor.red.cgColor) | |
| context.replacePathWithStrokedPath() | |
| context.clip() | |
| let startPoint2 = CGPoint(x: 0, y: rect.height/2) | |
| let gradient = CGGradient(colorsSpace: CGColorSpaceCreateDeviceRGB(), colors: [UIColor.blue.cgColor, UIColor.green.cgColor] as CFArray, locations: [0.3, 0.7]) | |
| context.drawLinearGradient(gradient!, start: startPoint2, end: endPoint1, options: CGGradientDrawingOptions.drawsAfterEndLocation) | |
| } | |
| } | |
| override func awakeFromNib() { | |
| super.awakeFromNib() | |
| backgroundColor = UIColor.clear | |
| } | |
| } | |
| // Test in Playgoround | |
| let v = UIView(frame: CGRect(x: 0, y: 0, width: 500, height: 500)) | |
| v.backgroundColor = UIColor.white | |
| let p = GradientLineView(frame: CGRect(x: 20, y: 20, width: 200, height: 50)) | |
| v.addSubview(p) | |
| PlaygroundPage.current.liveView = v | |
| PlaygroundPage.current.needsIndefiniteExecution = true |
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Great information. Thank you