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Id
15329559
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0
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2013-03-11T00:40:58.070
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2014-05-18T01:26:25.030
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2014-05-18T01:26:25.030
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177525
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2
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3
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In the <code>@synthesize</code> syntax, the left side of the <code>=</code> (which is just a character the synthesize uses for this syntax, not the assignment operator) is the name of the property (and associated methods), and the right side of the <code>=</code> is the instance variable to use for the named property. In the above example, <code>@synthesize fetchedResultsController=fetchedResultsController_</code> creates a fetchedResultsController getter method and a setFetchedResultsController: setter method, both using the fetchedResultsController_ instance variable for storage. Likewise, <code>@synthesize managedObjectContext=managedObjectContext_</code> creates managedObjectContext and setManagedObjectContext: accessor methods, both backed by the managedObjectContext_ instance variable. If the “right sides” had not been explicitly specified (if the declaration read <code>@synthesize fetchedResultsController, managedObjectContext;</code>), synthesize would've assumed the same name for the instance variable as the property. Some Objective-C programmers dislike leaving it at this default behaviour because it can be easy to make the mistake of intending to set local function-scope variable and instead setting an instance variable instead. Using an underscore for all instance variables makes their intent clearer. Just to be clear, multiple <code>@synthesize</code> properties can be combined into one by comma separating; each is still its own declaration such that the above is fully equivalent to: <pre><code>@synthesize fetchedResultsController=fetchedResultsController_; @synthesize managedObjectContext=managedObjectContext_; </code></pre> Also worth nothing, in newer Xcode/iOS versions instance variables will be created automatically if not explicitly defined, and @synthesize declarations are also assumed if not specified. These differences are explained in Apple's quick-ref <a href="https://developer.apple.com/library/ios/#releasenotes/ObjectiveC/ObjCAvailabilityIndex/" rel="nofollow" title="Objective-C Feature Availability Index">Objective-C Feature Availability Index</a>.
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1. POCan someone explain this @synthesize syntax?
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1. USSlipp D. Thompson
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1. USSlipp D. Thompson
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