绘制阴影的栗子:
注意需要保存和恢复上下文,否则画布上所有的绘制图形都会加上阴影。
// shadow
let context = UIGraphicsGetCurrentContext()
let shadowRect = CGRectInset(self.bounds,self.bounds.size.width*0.1,self.bounds.size.height*0.1)
let shadowPath = UIBezierPath(roundedRect: shadowRect,cornerRadius: 10)
CGContextSaveGState(context)
let shadowStyle = UIColor.blueColor().CGColor
let shadowOffset = CGSize(width: 3,height: 3)
let shadowBlurRadius:CGFloat = 5.0
CGContextSetShadowWithColor(context,shadowOffset,shadowBlurRadius,shadowStyle)
UIColor.grayColor().setFill()
shadowPath.fill()
CGContextRestoreGState(context)
下面是渐变的栗子:
let colorSpace = CGColorSpaceCreateDeviceRGB()
let context = UIGraphicsGetCurrentContext()
let gradientStartColor = UIColor(red: 0.1,green: 0.1,blue: 0.8,alpha: 1)
let gradientEndColor = UIColor(red: 1,green: 0.6,alpha: 1)
let gradientColors:CFArray = [gradientStartColor.CGColor,gradientEndColor.CGColor]
let gradientLocations:[CGFloat] = [0.0,1.0]
let gradients = CGGradientCreateWithColors(colorSpace,gradientColors,gradientLocations)
let pathRect = CGRectInset(self.bounds,20,20)
let topPoint = CGPointMake(self.bounds.size.width/2,20)
let bottomPoint = CGPointMake(self.bounds.size.width/2,self.bounds.size.height - 20)
let roundedRectPath = UIBezierPath(roundedRect: pathRect,cornerRadius: 4)
CGContextSaveGState(context)
roundedRectPath.addClip()
CGContextDrawLinearGradient(context,gradients,bottomPoint,topPoint,CGGradientDrawingOptions.DrawsAfterEndLocation)
CGContextRestoreGState(context)
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