Question

I’m trying to build a query string or predicate but I keep getting this error,

Basically what I can’t understand is that this works fine:

NSPredicate *pred = [NSPredicate predicateWithFormat:@"(name contains[cd] 'o')"];

But this:

NSString *predString =  @"(name contains[cd] 'o')";
NSPredicate *pred = [NSPredicate predicateWithFormat:@"%@", predString]; 

throws this:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Unable to parse the format string "%@"'

Answer 1

%@ is not a predicate format, it’s a string format.

NSPredicate *pred = [NSPredicate predicateWithFormat:predString];