└── README


/README:
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 1 | If your system supports blocks (like iOS 4+) then you should just use the dispatch_once function as follows:
 2 | 
 3 | + (MyClass *)sharedInstance
 4 | {
 5 |     static MyClass *sharedInstance = nil;
 6 |     static dispatch_once_t onceToken;
 7 |     dispatch_once(&onceToken, ^{
 8 |         sharedInstance = [[MyClass alloc] init];
 9 |         // Do any other initialisation stuff here
10 |     });
11 |     return sharedInstance;
12 | }
13 | 
14 | This method was sourced from http://stackoverflow.com/questions/7568935/how-do-i-implement-an-objective-c-singleton-that-is-compatible-with-arc courtesy Nick Forge
15 | 
16 | 
17 | =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
18 | =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
19 | 
20 | 
21 | See the "pre-blocks" branch for the old implementation:
22 | 
23 | A Singleton Macro that swaps method implementations at runtime so that only the initialization portion will require syncrhonization (lock).
24 | - Specifically it uses method_setImplementation() to dynamically replace the sharedInstance access method with one that does not instantiate a new object and thus does not require @synchronized.
25 | 
26 | It is based on the work here: http://cocoawithlove.com/2008/11/singletons-appdelegates-and-top-level.html  by Matt Gallagher
27 | But changing the implementation to use method swizzling as described here: http://googlemac.blogspot.com/2006/11/synchronized-swimming-part-2.html by Dave MacLachlan of Google.
28 | 


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