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Asked: 2026-06-17T01:14:28+00:00

I want to add an array to a key in nsdictionary. Such as each

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I want to add an array to a key in nsdictionary. Such as each key is a question and each questions has multiple answers.

Question1 = [Answer1], [Answer2] , [Answer3];

Question2 = [Answer1], [Answer2] , [Answer3];

With below code I get No Visible @interface for NSDictionary declares the selector ‘setObject:forKey:’

//answers
_surveyAnswers1 = [[NSMutableDictionary alloc] init];
NSArray *myArrayAnswers1 = [NSArray arrayWithObjects:@"One",@"Two", nil];
NSArray *myArrayAnswers2 = [NSArray arrayWithObjects:@"Three",@"Four", nil];
[_surveyAnswers1 setObject:myArrayAnswers1 forKey:@"FirstKey"];
[_surveyAnswers1 setObject:myArrayAnswers2 forKey:@"SecondKey"];

What is correct way to add an array to a key in NSDictionary?

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1 Answer

  1. Editorial Team

    _surveyAnswers1 seems to be declared as an NSDictionary:

    NSDictionary * _surveyAnswers1;

    You need to declare it as NSMutableDictionary:

    NSMutableDictionary * _surveyAnswers1;

    The compiler checks what methods are available on the object based on its declared type; NSDictionary does not have the method setObject:forKey:, so the compiler warns you (under ARC, this is an error) about that. It would work at runtime, because the object actually is an NSMutableDictionary, but you should still fix the declaration.

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