iphone - Global variables and objects in Objective C. What is the best way? -

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I want to use global variables and objects for iphone project.

I have created NSObject class and defined as below:

.h file:

  #import & lt ; Foundation / Foundation. H & gt; @ Interface Global Class: NSOBX Extension NSSSing * IISST; External NSMUttAbra * Armarta; @end   
  Meter file:   
  #import "GlobelClass.h" @implementation GlobelClass NSString * mystr; NSMutableArray * Arrdata; @end   
 What is the best way or should I use the singleton pattern like the link answer below:  
 Share the idea   
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 The way in which to use the global variable in the application is:  
 You Application representative class can only be used> 
 .h file:  
  app delegate: uirponder & lt; UIApplicationDelegate & gt; {} @property (non-rigorous, strong) NSString * strUserID;   
 .m file:  
  @ synthesis strUserID;   
 You can now use strUserID as a global variable in your UIViewController:  
  ABCProjectAppDelegate * AppDelegate = (ABCProjectAppDelegate *) [ UIApplication sharedApplication] representative];   
 You can set the price:  
  appDelegate.strUserID = @ "test";   
 Get the value:  
  NSString * strId = appDelegate.strUserID;   
 :)