Question

Hello! I have a little problem I was hoping the community could help me with.

1. In CounterviewController, I have one label and two Buttons “Add” and “Sub”. By pressing the Sub button it decrements the value normally but I need to stop with 0 (don’t go below zero to -1,-2,-3,-4).

2. Then I need to display the countLabel value into the PreviousView label. Can you please help me?

Here’s my code:

(IBAction)decrementNumber:(id)sender
 {
    number--;
    [currentNumber setText:[NSString stringWithFormat:@"%d", number]];
 }

Could you please point out where my error is?

Thanks in Advance,

Padmavathi CP.

Answer 1

For your first question, only decrement and display if the number is greater than zero:

-(IBAction)decrementNumber:(id)sender
 {
    if (number > 0) {
        number--;
        [currentNumber setText:[NSString stringWithFormat:@"%d", number]];
    }
 }

For your second question, the method may well depend on your object types. For example, for transfers between two NSTextField objects (or others based on NSControl), you could use something like:

[previousView setStringValue: [countLabel stringValue]];