Resetting a singleton in Objective-C

Resetting singletons can come handy when we want to update and display same data from different view controllers.

We just write a method inside of the singleton that can reset it for us.
The header would like this

@interface DataController : NSObject
{
NSString  *singletonString;
}

@property (nonatomic, strong) NSString *singletonString;

+(DataController*)sharedInstance;

@end

And we just add the following method into our header

+ (void)resetSharedInstance;

For the implementation we make sure we don’t have a “dispatch_once_t” otherwise once we set the singleton to “nil” we will not be able to reinitialize the singleton and it will remain “nil”.

#import "MySingleton.h"


@implementation DataController
@synthesize singletonString;

static DataController *sharedInstance = nil;
+(DataController*)sharedInstance
    {
 
            {
                if (sharedInstance == nil)
                {
                    sharedInstance = [[DataController alloc]init];
                }
            }
        return sharedInstance;
    }

+ (void)resetSharedInstance {
    sharedInstance = nil;
}
@end

Now we can call the method from any other class after importing the Singleton Class with the following call

[MySingleton resetSharedInstance];

;