How to add variable to array in Objective-C?

Question

I have the code [usrs addObject:usrString] I am trying to make it so that the program adds whatever the string usrString is to the array every time that you press a button, and that the string is different every time. However, whenever I run this code, it doesn't do anything. It doesn't even add an object to the array. How can I make this code do what I want?

Are you using an NSMutableArray? Irrespective, we need to see the code. Also, where are you expecting the string data to come from? — John Parker
– John Parker, Commented Dec 19, 2010 at 16:32
I think this may be a rephrase of middaparka's question: have you actually created an array, or merely declared a pointer to one in your class? All objects have to be explicitly created in Objective-C. — Tommy
– Tommy, Commented Dec 19, 2010 at 16:34
I have declared the variable previously, it is a mutable array, and the string data comes from the input from a textbox, which I convert into a string. — user457303
– user457303, Commented Dec 19, 2010 at 17:33

Sam · Accepted Answer · 2010-12-19 20:27:14Z

1

I am going to take a shot in the dark and say that you forgot to alloc/init your NSMutableArray. In Objective-C, sending messages to nil will fail silently.

e.x.

myArray = [[NSMutableArray alloc] init];

answered Dec 19, 2010 at 20:27

Sam

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user457303 Over a year ago

This solved part of my problem thanks! However, I still would like to know how to make it add whatever string the user inputs. Thanks again!

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