Objective C: array of class object as property

Question

Is it possible in an Objective-C class to store an array of instances of another class as a property?

Simple example: I have a class called "Classroom" and a class called "Students".

@interface Student
    @property int m_id;
@end

...

@interface Classroom
    @property Student *m_students[20]; // this causes a compilation error: property cannot have an array or function type 'Student *[20]'
@end

How can I do the equivalent of this?

Quentin Hayot · Accepted Answer · 2015-08-19 08:40:35Z

0

Use a NSArray or NSMutableArray instead:

@interface Classroom
    @property NSMutableArray *m_students; // this causes a compilation error.
@end

Then in your implementation:

Student *student = [[Student alloc] init];
[self.m_students addObject:student];

NSArray (and it's subclass NSMutableArray) can contain any Objective-C object. And you can even mix them in the same array.

answered Aug 19, 2015 at 8:40

Quentin Hayot

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3 Comments

user1070447 Over a year ago

Thanks! So if I want 20 students in my array, should this be done 20 times?

Adnan Aftab Over a year ago

Yes you have to do 20 times

hariszaman Over a year ago

offcourse using a loop/recursion (: and inherit both of the class from NSObject

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