查看字体的种类

 NSArray *familyArray = [UIFont familyNames];
    NSString *familyName ;
    NSMutableArray *fontNames = [[NSMutableArray alloc] init];
    for(familyName in familyArray)  {
        NSArray *names = [UIFont fontNamesForFamilyName:familyName];
        [fontNames addObjectsFromArray:names];
    }
    NSLog(@"%@", fontNames);