Why do I need to use the @property keyword in objective-c?

Question

Suppose I have the following public methods in my class:

- (BOOL)finished
{
    return _finished;
}
- (void)setFinished:(BOOL)aValue
{
    _finished = aValue;
}

I also need to set the finished as a property in the class:

@property SomeClass *finished;

I may have misunderstood @property, but it seems to me that I am repeating myself.

• Should declare both methods and @propertyor only one of them?

Answer 1

By declaring a @property, the LLVM compiler automatically synthesizes your accessor methods (getter and setter), as well as the instance variable ( ivar), indicated by the underscore prefix ( _finished, for example)

, ( / ivar), @property . -finished -setFinished

@property, ivar

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, @property atomic, ivar ,

Answer 2

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, @synthesize @property. ( !)

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. , @property: . ( -setFinished:? -isFinished? -finished), (weak, strong, copy). , .