您可以尝试类似以下设置的操作来生成以下形状,这只是向您展示设置的示例,但这应该可以做到:
let context = UIGraphicsGetCurrentContext()
let gradientColor3 = UIColor(red: 1.000, green: 1.000, blue: 1.000, alpha: 1.000)
let gradientColor4 = UIColor(red: 0.000, green: 1.000, blue: 0.000, alpha: 1.000)
let sVGID_1_2 = CGGradientCreateWithColors(CGColorSpaceCreateDeviceRGB(), [gradientColor3.CGColor, gradientColor4.CGColor], [0, 1])
CGContextSaveGState(context)
CGContextTranslateCTM(context, 198.95, 199.4)
CGContextRotateCTM(context, -30 * CGFloat(M_PI) / 180)
var polygonPath = UIBezierPath()
polygonPath.moveToPoint(CGPointMake(0, -145.95))
polygonPath.addLineToPoint(CGPointMake(126.4, -72.98))
polygonPath.addLineToPoint(CGPointMake(126.4, 72.97))
polygonPath.addLineToPoint(CGPointMake(0, 145.95))
polygonPath.addLineToPoint(CGPointMake(-126.4, 72.98))
polygonPath.addLineToPoint(CGPointMake(-126.4, -72.97))
polygonPath.closePath()
CGContextSaveGState(context)
polygonPath.addClip()
CGContextDrawLinearGradient(context, sVGID_1_2,
CGPointMake(-126.4, -72.97),
CGPointMake(126.41, 72.99),
UInt32(kCGGradientDrawsBeforeStartLocation) | UInt32(kCGGradientDrawsAfterEndLocation))
CGContextRestoreGState(context)
产生这个:
如果这不起作用,请告诉我,我会尽力修复它以使其起作用。
另外,这只是一个简单的矩形:
let context = UIGraphicsGetCurrentContext()
let gradientColor = UIColor(red: 1.000, green: 1.000, blue: 1.000, alpha: 1.000)
let gradientColor2 = UIColor(red: 0.988, green: 0.933, blue: 0.129, alpha: 1.000)
let gradientColor3 = UIColor(red: 1.000, green: 0.000, blue: 1.000, alpha: 1.000)
let sVGID_1_3 = CGGradientCreateWithColors(CGColorSpaceCreateDeviceRGB(), [gradientColor.CGColor, gradientColor2.CGColor, gradientColor3.CGColor], [0, 0.43, 1])
let rectanglePath = UIBezierPath(rect: CGRectMake(68, 28, 78.4, 78.4))
CGContextSaveGState(context)
rectanglePath.addClip()
CGContextDrawLinearGradient(context, sVGID_1_3,
CGPointMake(68, 67.19),
CGPointMake(146.38, 67.19),
UInt32(kCGGradientDrawsBeforeStartLocation) | UInt32(kCGGradientDrawsAfterEndLocation))
CGContextRestoreGState(context)
这是一个要尝试的功能,您将不得不弄乱颜色,但您可以输入一个框架:
class func drawStuff(#frame: CGRect) {
let context = UIGraphicsGetCurrentContext()
let gradientColor = UIColor(red: 1.000, green: 1.000, blue: 1.000, alpha: 1.000)
let gradientColor2 = UIColor(red: 0.988, green: 0.933, blue: 0.129, alpha: 1.000)
let gradientColor3 = UIColor(red: 1.000, green: 0.000, blue: 1.000, alpha: 1.000)
let sVGID_1_4 = CGGradientCreateWithColors(CGColorSpaceCreateDeviceRGB(), [gradientColor.CGColor, gradientColor2.CGColor, gradientColor3.CGColor], [0, 0.43, 1])
let rectangleRect = CGRectMake(frame.origin.x, frame.origin.y, frame.size.width, frame.size.height)
let rectanglePath = UIBezierPath(rect: rectangleRect)
CGContextSaveGState(context)
rectanglePath.addClip()
CGContextDrawLinearGradient(context, sVGID_1_4, CGPointMake(rectangleRect.minX, rectangleRect.midY),CGPointMake(rectangleRect.maxX, rectangleRect.midY), 0)
CGContextRestoreGState(context)
}