FX色彩空间高级图像像素枚举：动态创建UIImage： UIImage* patternImage = [UIImage FX_imageWitSize:CGSizeMake(100, 100) generator:^RGBA(size_t x, size_t y){ if( (x < 10) ^ (y < 10) ) return FX_RGBA_Make(200, 255); else return FX_RGBA_Mak