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@synthesize vs @dynamic, what are the differences?

Samuel Fernandes 2320 27-Apr-2015
What are the differences between implementing a @property with @dynamic or @synthesize?
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Updated on 27-Apr-2015
Samuel Fernandes

Samuel Fernandes

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Anonymous User

Anonymous User

27-Apr-2015
@synthesize will generate getter and setter methods for your property. @dynamic just tells the compiler that the getter and setter methods are implemented not by the class itself but somewhere else (like the superclass or will be provided at runtime).

Uses for @dynamic are e.g. with subclasses of NSManagedObject (CoreData) or when you want to create an outlet for a property defined by a superclass that was not defined as an outlet:

Super class:

@property (nonatomic, retain) NSButton *someButton;
...
@synthesize someButton;
Subclass:

@property (nonatomic, retain) IBOutlet NSButton *someButton;
...
@dynamic someButton;

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