how TRUEPREDICATE differ from [NSPredicate predicateWithValue:YES]?

Question

I am using [fetchRequest setPredicate:[NSPredicate predicateWithValue:YES]]; to debug my code to by pass universal true predicate. When I exicuting lldb command po [NSPredicate predicateWithValue:YES], it print TRUEPREDICATE.

The return type for predicateWithValue: is NSPredicate.

When I changed it to [fetchRequest setPredicate:TRUEPREDICATE]; Xcode complain a syntax error "use of un-declared identifier"

My question is should I have to import any header file to remove error? If not then how TRUEPREDICATE differ from [NSPredicate predicateWithValue:YES].

Answer 1

A universal true predicate can be created with

[NSPredicate predicateWithValue:YES];

or

[NSPredicate predicateWithFormat:@"TRUEPREDICATE"];

Both statements return the same predicate.

po prints the description of an object. The description of NSPredicate is similar to the format.