Static variable in Objective-C

From time to time you will want to declare a static object which hold your data and won't be changed when your app is still running.

In iOS SDK, there's no easy way to get your variable to static, however, you can you singleton design-pattern and set its instance to be static. Below are a code snippet for Static Object

IOS Static: 

//DataClass.h      

@interface DataClass : NSObject 

{

        NSString *str;     

}    

@property(nonatomic,retain)NSString *str;    

+(DataClass*)getInstance;    

@end  

//DataClass.m    

@implementation DataClass    

@synthesize str;    

static DataClass *instance =nil;    

+(DataClass *)getInstance    

{    

    @synchronized(self)    

    {    

        if(instance==nil)    

        {

            instance= [DataClass new];    

        }    

    }    

    return instance;    

}    

Now in your view controller you need to call this method like this:

DataClass *obj=[DataClass getInstance];  

obj.str= @"I am Global variable";