[英]Swift - Create radial line for button when pressed
当您要绘制一个简单的几何图案时,为什么不直接在代码中绘制呢? 这是我渲染的放射状图片:
这是生成它的测试应用程序的完整代码:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let c1 = UIColor(red: 140/255.0, green: 240/255.0, blue: 209/255.0, alpha: 1)
let c2 = UIColor(red: 59/255.0, green: 150/255.0, blue: 123/255.0, alpha: 1)
let iv = UIImageView(image:self.radialLinesImage(
size:CGSize(width:200, height:200), div:20,
c1:c1, c2:c2))
iv.frame.origin = CGPoint(x:100, y:100)
self.view.addSubview(iv)
}
func radialLinesImage(size:CGSize, div:CGFloat, c1:UIColor, c2:UIColor) -> UIImage {
let r = UIGraphicsImageRenderer(size: size)
return r.image { ctx in
c1.setFill()
ctx.fill(CGRect(origin:.zero, size:size))
c2.setFill()
let p = UIBezierPath()
let c = CGPoint(x:size.width/2, y:size.height/2)
for i in 0..<Int(div) {
let a = CGFloat.pi/(div/2) * CGFloat(i)
p.addArc(withCenter: c,
radius: size.width+size.height,
startAngle: a, endAngle: a+CGFloat.pi/div,
clockwise: true)
p.addLine(to: c)
p.fill()
}
}
}
}
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