Just a quick tip for creating a globally accessible bunch of constants for your iOS project. In AS3 I would use a class with a public static variable but in Objective C you can use constants or definitions and there are probably several other ways to do it.

To use constants globally:

1. Define a new Objective C class which extends NSObject for example called ProjectConstants
2. Above the implementation line in its header (ProjectConstants.h) file add this:
   extern NSString * const PAGE_TITLE;
3. In the implementation (ProjectConstants.m) file add:
   NSString * const PAGE_TITLE = @"My Page Title";
4. Access it globally by importing the ProjectConstants.h and then you can use PAGE_TITLE anywhere in the project:
   NSString *pgTitle = PAGE_TITLE;
myLabel.text = pgTitle;

Another quicker way is to use definitions in your implementation of your .m file such as: #define PAGE_TITLE @"Title"
The disadvantage of that is you can’t compare strings using pointer comparison i.e. (myString == MyConstant) but you can still use [myString isEqualToString:MyConstant] but its not as easy to read, and apparently not that fast either.