Question

I have a button that, when tapped, adds a label inside a view. Anytime it is tapped after that, it adds another label that starts where the last one ended.

I tried this

if (self.currentLabel == nil)  
     startingPoint = 0;
else
    startingPoint = currentLabel.frame.size.width + 5;

// Most recently created label becomes currentLabel
self.currentLabel = [[FormulaLabel alloc] initWithFrame:CGRectMake(startingPoint, 10, 100, 50)]; 

To keep track of all the labels, I tried adding them to an array

 [arrayOfObjects addObject:self.currentLabel] 

but I noticed that the array count wasn’t changing.

Why doesn’t the above code work, and is there a better way to keep track of an indefinite amount of labels?

Answer 1

NSArrays are immutable. You need to use an NSMutableArray.

If you are already using a NSMutableArray, are you getting any warnings?

As an additional note, “arrayOfObjects” is a poor name. Something like “labels,” “usedLabels” or “labelHistory” would be far more descriptive.