CODEWITHSUNDEEP
objective-c
alexcash
alexcash

Reputation: 235

Properties declared as instance variables too?

This code works:

    @interface StringStuff : NSObject {

    }
    @property (nonatomic, retain) NSString *String1;
    @property (nonatomic, retain) NSString *String2;

    - (NSString *) doSomethingWithStrings;

    @end

But I often see:

        @interface StringStuff : NSObject {
             NSString *String1;
             NSSTring *String2;    
        }
        @property (nonatomic, retain) NSString *String1;
        @property (nonatomic, retain) NSString *String2;

        - (NSString *) doSomethingWithStrings;

        @end

Is there a reason that properties are often declared as an instance variable as well? Is it just considered good form?

Upvotes: 4

Views: 122

Answers (1)

bbum
bbum

Reputation: 162712

Legacy; it used to be (and still is on 32 bit Mac OS X targeted code) that the ivar declarations were required. That is no longer true on iOS, the simulator and 64 bit OS X.

Note that it is common to @synthesize iVar = iVar_; to prevent accidental direct access where self.iVar is really required.

Upvotes: 6

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