Objective-C: Adding to variable before assignment

Question

I have the following code:

 NSInteger variableScene = 10;
 NSInteger numberOfRowsXX = //an Integer value; <-- I would like replace XX with the value of 'variableScene'

So it'll look like this:

NSInteger numberOfRows10 == //an Integer value;

How can I replace XX with the value of variableScene?

*Update*

Why I'm trying accomplish this?

It's a bit complicated. I'm using Core Data with remote Database. In a nutshell: I have 10 Scenes that'll be presented based on the User selection order. For each Scene I need to assign the numberOfRows to present at the end of all the Scenes with a UITableViewController.

I have a variableScene that I pass around from Scene to Scene.

I need to assign numberOfRowsSceneXX = //an integer

XX will come from variableScene, which could be any number from 1 - 10.

So when we get to the last scene, we'll have a value for each Section (numberOfRowInSection) which will be represented by each Scene: numberOfRowScene1, numberOfRowsScene2, etc.

I tried to simplify the question. Hope it makes sense.

What is the use case for this? You can concatenate tokens with macros #define SECTION_ROW(name) sectionRow ## name but I'd be interested to know what you're trying to accomplish. — Brian Nickel
– Brian Nickel, Commented Sep 3, 2013 at 3:18
You almost certainly want an array of NSIntegers here. What are you trying to do? This looks like you're trying to solve a problem "the hard way". — gavinb
– gavinb, Commented Sep 3, 2013 at 3:22
According to your update, it's still not persuading why an array can't be used. You can have a global array (or at least an array where all the Scenes can access to update). For every scene, you update numberOfRowsInScene[i], where i = variableScene-1. Unless it's not what you are up to. — Khanh
– Khanh, Commented Sep 3, 2013 at 3:46
Use an NSArray. Once compiled, local and (c-)global variables only exist as memory addresses or even just registers; names are only a way to make it easier for you to keep straight what is what. Technically, it is possible to do this with properties, but it's a really bad idea. — Kevin
– Kevin, Commented Sep 3, 2013 at 3:57
Got it. Makes sense. Thanks. If someone wants to answer it, I'll mark it as an acceptable answer. — user1107173
– user1107173, Commented Sep 3, 2013 at 4:01

Josh B · Accepted Answer · 2013-09-03 05:53:07Z

2

Use arrays.

set it up as:

#define MAX_SCENES 10
NSInteger numberOfRows[MAX_SCENES];

then when you want to set the value:

if (variableScene < MAX_SCENES) {
  numberOfRows[variableScene] = variable;
}

answered Sep 3, 2013 at 5:53

Josh B

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