Question

I am making a utility application, and I have a label on my main view. Depending on the user’s selection, that label should say one of two things. How can I use a segmented control to change the label text?

Answer 1

In your flipside, create an IBAction called segmentedControlChanged – and hook it up to the ‘value changed’ trigger on the segmented control.

At the top of your settings controller, declare this constant:

#define kSegmentKey @"SegmentSetting" // Call these whatever you want

In your segmentedControlChanged method, write to NSUserDefaults, like so:

- (IBAction)segmentedControlChanged:(id)sender {
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setInteger:[sender selectedSegmentIndex] forKey:kSegmentKey];
}

In your main view controller’s viewWillAppear, put the following code:

- (void)viewWillAppear:(BOOL)animated {
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    int setting = [defaults integerForKey:kSegmentKey];
    if (setting == 0) {
        myLabel.text = @"First Message";
    }
    else {
        myLabel.text = @"Second Message";
    }
}