Getting “use of undeclared identifier”, when I add the getter, why?

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I am doing the Matchismo assignment from the Stanford website.

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  • So far I have followed the slides exactly the way they are.

    Also, this error only shows up when I implement the last method i.e. the getter. If I remove the getter, there’s no issue.

    The notes can be downloaded from here: Stanford Course Website



    .m file:

        #import "playingCard.h"
        @implementation playingCard
        -(NSString *) contents
            NSArray *rankStrings = @[@"?",@"A",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10",@"J",@"Q",@"K"];
        return [rankStrings[self.rank] stringByAppendingString:self.suit];
    -(void) setSuit:(NSString *) suit
        if([@[@"♣︎",@"♥︎",@"♦︎",@"♠︎"] containsObject:suit])
             _suit = suit;
    - (NSString *)isSuit
        return _suit ? _suit : @"?";

    .h file:

    #import "card.h"
    @interface playingCard : card
    @property(strong, nonatomic, getter=isSuit) NSString *suit;
    @property(nonatomic) NSUInteger rank;

    2 Solutions Collect From Internet About “Getting “use of undeclared identifier”, when I add the getter, why?”

    Solution slide

    Adding one line does the trick!

    @synthesize suit = _suit;

    ALT, moment…you are mistaking something.

    You set a @property so suit is autosynthesized to _suit.

    Then, your getter isSuit is logically wrong. I mean that isSomething is used to receive a BOOL and have a “more readable” getter. You don’t need in this case to change the name of the getter, and could declare the property just with:

    @property(strong, nonatomic) NSString *suit;

    At this point you don’t need to synthesise anything because your var is already autosinthesized, and your getter method can be simply:

    - (NSString *)suit
        return _suit ? _suit : @"?";

    It is important that you understand what you are doing.