View Controllers - iOS Programming: The Big Nerd Ranch Guide - page 232

In TimeViewController.m , implement the action method:
- (IBAction)showCurrentTime:(id)sender
{
NSDate *now = [NSDate date];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setTimeStyle:NSDateFormatterMediumStyle];
[timeLabel setText:[formatter stringFromDate:now]];
}
Build and run the application. Tap the What time is it? button, and you will see the current
time on the UILabel . Figure 7.12 is the object diagram for the application as it currently
stands.
Figure 7.12 TimeViewController's view on the window