Uexpected warning:

[pencilCool]

context

Test in device iPhone 5s an iOS version is 10.2.0

1.   if (NSFoundationVersionNumber > NSFoundationVersionNumber_iOS_6_1) {
2.         _unselectedTitleAttributes = @{
3.                                        NSFontAttributeName: [UIFont systemFontOfSize:12],
4.                                        NSForegroundColorAttributeName: [UIColor blackColor],
5.                                        };
6.     }

Break at 3rd line .After click the "continue run" button several times the app run ;

The warning

warning: could not load any Objective-C class information. This will significantly reduce the quality of type information available.

Question

I have search in google and read some answers in stackoverflow but I still can not get the point.