<分区>
回顾一个旧项目，我打算添加一些功能，但遇到了这个错误。有谁知道如何消除这个？它发生在下面的代码中:
UInt32(CGGradientDrawingOptions.DrawsBeforeStartLocation) | UInt32(CGGradientDrawingOptions.DrawsAfterEndLocation))
完整文件如下:
import UIKit
class BackgroundView: UIView {
override func drawRect(rect: CGRect) {
// Background View
//// Color Declarations
var lightPurple: UIColor = UIColor(red: 0.377, green: 0.075, blue: 0.778, alpha: 1.000)
var darkPurple: UIColor = UIColor(red: 0.060, green: 0.036, blue: 0.202, alpha: 1.000)
let context = UIGraphicsGetCurrentContext()
//// Gradient Declarations
let purpleGradient = CGGradientCreateWithColors(CGColorSpaceCreateDeviceRGB(), [lightPurple.CGColor, darkPurple.CGColor], [0, 1])
//// Background Drawing
let backgroundPath = UIBezierPath(rect: CGRectMake(0, 0, self.frame.width, self.frame.height))
CGContextSaveGState(context)
backgroundPath.addClip()
CGContextDrawLinearGradient(context, purpleGradient,
CGPointMake(160, 0),
CGPointMake(160, 568),
UInt32(CGGradientDrawingOptions.DrawsBeforeStartLocation) | UInt32(CGGradientDrawingOptions.DrawsAfterEndLocation))
CGContextRestoreGState(context)
}
}