iOS sdwebimage 特殊图片错误的问题

原先sdwebimage是使用

CGImageGetColorSpace(imageRef),

但这个的有些图片会报错

Aug  8 15:52:13 game--Pro.local[88338] <Error>: CGBitmapContextCreate: unsupported color space.
Aug  8 15:52:13 game--Pro.local[88338] <Error>: CGContextDrawImage: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.
Aug  8 15:52:13 game--Pro.local[88338] <Error>: CGBitmapContextCreateImage: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

然后修改为下面代码可以解决上面这个错误

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    CGContextRef context = CGBitmapContextCreate(NULL, width,
                                                 height,
                                                 CGImageGetBitsPerComponent(imageRef),
                                                 0,
//                                                 CGImageGetColorSpace(imageRef),
                                                 colorSpace,
                                                 kCGBitmapByteOrderDefault | kCGImageAlphaPremultipliedFirst);