Question

i want to make my object singleton in the iPhone application.What is the proper way of implementing this in objective-c.

Answer 1

Here’s how I do it.

+(MyClass*) mySingleton 
{
     static MyClass* theSignleton = nil;

     @synchronized([MyClass class])
     {
         if (theSingleton == nil)
         {
             theSingleton = [[MyClass alloc] init];
         }
     }
     return theSingleton; 
}

That doesn’t stop people from accidentally creating non singleton instances but I think it’s better to design your class so that non singletons don’t break the class rather than trying to stop non singletons. It makes them easier to handle in unit tests.