my current solution is to init CCLabelTTF something like this:
CCLabelTTF *label = [CCLabelTTF labelWithString:@"Hello World" fontName:@"Marker Felt" fontSize:64 dimensions:size hAlignment:kCCTextAlignmentCenter vAlignment:kCCVerticalTextAlignmentCenter];
where size is [CCDirector sharedDirector].winSize for my examle.
any other suggestions are welcome