NSPredicate dont work with double values (%f)?

it works fine with long float, %lf

Don't ever use == to compare floating point values.

If you want to find objects with a "specific" value, compare against a small range. Otherwise, floating-point representation error will bite you.

So consider using:

const float epsilon = 0.000001;
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"latitude > %f AND latitude < %f AND longitude > %f AND longitude < %f", coordinate.latitude - epsilon,  coordinate.latitude + epsilon, coordinate.longitude - epsilon, coordinate.longitude + epsilon];

It's because the precision of floats is not 100%. So you could also do this:

[NSPredicate predicateWithFormat:@"abs(latitude - %f) < 0.0001 AND abs(longitude - %f) < 0.0001", coordinate.latitude, coordinate.longitude]