遍历iOS系统字体库中所有字体

NSArray *familyNames = [[NSArray alloc] initWithArray:[UIFont familyNames]];
    for (NSString *family in familyNames) {
      NSLog(@"Family name: %@", family);

      NSArray *fontNames = [UIFont fontNamesForFamilyName: family];
      for (NSString *font in fontNames) {
        NSLog(@"    Font name: %@", font);
      }
    }