LOFTER-网易轻博

   unsignedchar pixel[4] = {0};

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    CGContextRef context = CGBitmapContextCreate(pixel, 1, 1, 8, 4, colorSpace, kCGBitmapAlphaInfoMask & kCGImageAlphaPremultipliedLast);

    CGContextTranslateCTM(context, 0, 0);

    [self.layerrenderInContext:context];

    CGContextRelease(context);

    CGColorSpaceRelease(colorSpace);