使用自定义的颜色生成图片

class func imageWithColor(color:UIColor) -> UIImage
{
        let rect = CGRect(x: 0.0,y: 0.0,width: 1.0,height: 1.0)
        UIGraphicsBeginImageContext(rect.size)
        let context:CGContext = UIGraphicsGetCurrentContext()!
        CGContextSetFillColorWithColor(context,color.CGColor);
        CGContextFillRect(context,rect);
        
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        
        return image
}