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【ObjC】 iOS 放射状圆环

作者:Tobe1 / 发布于2014/12/13/ 1037


	struct Center {
	 var x:CGFloat
	 var y:CGFloat
	 }
	
	 // Only override drawRect: if you perform custom drawing.
	 // An empty implementation adversely affects performance during animation.
	 override func drawRect(rect: CGRect) {
	 // Drawing code
	 let center = Center(x: self.frame.width/2, y: self.frame.height/2)
	
	 for i in 1...360 {
	 // set diff color
	 let b = i > 120 && i < 200 || i > 240 && i < 350
	 let color = b ? UIColor.greenColor() : UIColor.lightGrayColor()
	 drawLine(i, color:color, c: center)
	 }
	 }
	
	 func drawLine(i:Int, color:UIColor , c:Center) {
	 //// General Declarations
	 let context = UIGraphicsGetCurrentContext()
	
	 //// Bezier Drawing
	 CGContextSaveGState(context)
	 CGContextTranslateCTM(context, c.x, c.y)
	 CGContextRotateCTM(context, CGFloat(i) * CGFloat(M_PI) / 180)
	
	 var bezierPath = UIBezierPath()
	 bezierPath.moveToPoint(CGPointMake(0, c.y))
	 bezierPath.addLineToPoint(CGPointMake(0, c.y - 16))
	 color.setStroke()
	 bezierPath.lineWidth = 1
	 bezierPath.stroke()
	
	 CGContextRestoreGState(context)
	
	 }

试试其它关键字

　放射状　　圆环　

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