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Objective —C µÄµ¥Àýģʽ SingletonʵÏÖ


static
 DataManager 
*
sharedDataManager 
=
 nil;
+
 (DataManager 
*
) sharedManager
{
    @synchronized(self)
 {
        
if
 (sharedDataManager 
==
 nil)
  {
            [[self alloc] init];
        }
    }
 
    
return
 sharedDataManager;
}
+
 (id)allocWithZone:(NSZone 
*
)zone
{
    @synchronized(self)
 {
        
if
(sharedDataManager 
==
 nil)
  {
            sharedDataManager 
=
 [super allocWithZone:zone];
            
return
 sharedDataManager;
        }
    }
 
    
return
 nil;
}


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