Disable a button based on a label's value

I have a UILabel cal开发者_如何转开发led label, and you can add or subtract 1 from it using two buttons. When you subtract all the way down to 0, I want the minus button to stop working. And if the value is added, I want the minus button to work again. Here is the method/code I'm using for the add/subtract button:

- (IBAction)addButton1:(id)sender {
    [label setText:[NSString stringWithFormat:@"%d",[label.text intValue] +1]];    
}

the code is the same for both the add/subtract methods. Except the +1 at the end is a -1.

I tried:

- (IBAction)addButton1:(id)sender {
    int val = [label.text intValue];

    [label setText:[NSString stringWithFormat:@"%d",[label.text intValue] +1]];    

    if(val - 1 <= 0) { 
        UIButton *button = (UIButton *)sender;
        [button setEnabled:NO]; 
    } 
}

Try

- (IBAction)addButton:(id)sender {

    if ( [[label text] intValue] == 0) 
        [minusButton setEnabled:YES];

    [label setText:[NSString stringWithFormat:@"%d",[label.text intValue] +1]];    
}


- (IBAction)subButton:(id)sender {

    [label setText:[NSString stringWithFormat:@"%d",[label.text intValue] -1]];

    if ( [[label text] intValue] == 0) 
        [minusButton setEnabled:NO];

}

You simply need to keep the pointer to the minus button (simply create an IBOutlet and then link it to the button using IB)