来这里，了解很多问题，发掘更多。
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示例代码
func imageForColors(colors: Array<UIColor> = [], withFrame frame: CGRect) -> UIImage? {
guard colors.count > 0 else {
return nil
}
var cgArrayColor: Array<CGColor> = []
for color in colors {
cgArrayColor.append(color.cgColor)
}
UIGraphicsBeginImageContextWithOptions(frame.size, true, 1.0)
let context = UIGraphicsGetCurrentContext()
context?.saveGState()
var colorSpace = (colors.last?.cgColor)!.colorSpace
var gradient = CGGradient(colorsSpace: colorSpace, colors: cgArrayColor as CFArray, locations: nil)
context?.drawLinearGradient(gradient!, start: CGPoint.init(x: 0.0, y: frame.size.height), end: CGPoint.init(x: frame.size.width, y: 0.0), options: .drawsBeforeStartLocation)
let image = UIGraphicsGetImageFromCurrentImageContext()
gradient = nil
context?.restoreGState()
colorSpace = nil
UIGraphicsEndImageContext()
return image
}
注意
以上内容为个人整理，如果有问题有出入或者你有更好的解决方法，还请赐教哦，感谢。
