synthesize

@synthesize statusText;

This is how we tell the compiler to automatically create the accessor and mutator methods for us.

two invisible methods in out class

:statusText   setStatusText:   

but they are there  nonetheless  waiting for use them.

when either button is tapped

-(IBAction)buttonPressed: (id)sender {

　　NSString *title = [sender titleForState:UIControlStateNormal];

　　NSString *newText = [[NSString alloc] initWithFormat:

　　　　　　　　　　　　　　@"%@ button pressed.", title];

}