Question

I have two UILabels that shows numbers. They are updated through UISteppers. I would like to include a third UILabel that calculates the division between UILabel1 and UILabel2 when the user presses on either of the UISteppers. (The two UILabels are therefore .text)

I know the method should be done if both the IBAction of the two UISteppers but I am having trouble thinking how the method should be written.

Does somebody have any idea how to write the method?

Thanks.

to update UILabel1

- (IBAction)smashChanged:(id)sender {

self.smashLabel.text = [NSString stringWithFormat:@"%d",
                         [[NSNumber numberWithDouble:[(UIStepper *)sender value]] intValue]];
}

Answer 1

You can use the method floatValue (or intValue) of NSString:

float value1 = [self.label1.text floatValue];
float value2 = [self.label2.text floatValue];
float value = (value2 == 0.0) ? 0 : value1 / value2; // This gives 0 if value2 is equal to 0
self.label3.text = [NSString stringWithFormat:@"%.2f", value]; // 2 decimal places