Error in Obj-C : Expected identifier or '(' - objective-c

Question

I'm trying to make a simple app with a button a score counter and a timer but I'm getting some errors
#import <UIKit/UIKit.h>
#interface xyzViewController : UIViewController
{
IBOutlet UILabel *scoreLabel;
IBOutlet UILabel *timerLabel;
NSInteger count;
NSInteger seconds;
NSTimer *timer;
}
- (IBAction)buttonPressed //Expected ';' after method prototype
{
count++
scoreLabel.text = [NSString stringWithFormat:#"Score \n %i", count]
}
#end
If I add ';' I get this instead:
- (IBAction)buttonPressed;
{ //Expected identifier or '('
count++
scoreLabel.text = [NSString stringWithFormat:#"Score \n %i", count]
}
#end
What I must to do?

Answer 1

You are mixing up interface and implementation. The interface contains
the (globally visible) instance variables, properties and method declarations, i.e.
the prototypes:
#interface xyzViewController : UIViewController
{
IBOutlet UILabel *scoreLabel;
IBOutlet UILabel *timerLabel;
NSInteger count;
NSInteger seconds;
NSTimer *timer;
}
- (IBAction)buttonPressed;
#end
The method itself goes into the implementation:
#implementation xyzViewController
- (IBAction)buttonPressed
{
count++;
scoreLabel.text = [NSString stringWithFormat:#"Score \n %i", count];
}
#end
Remarks:
The convention is to start class names with a capital letter: XyzViewController.
Create properties for the outlets (if you don't have them already):
#property (weak, nonatomic) IBOutlet UILabel *scoreLabel;
The compiler synthesizes the instance variable _scoreLabel automatically, so you don't need it in the interface. And then access the property via
self.scoreLabel.text = ....;

Answer 2

Define your interface in the .h iff they are to be public, then create your implementation in the .m. You can't combine them in the .h

Answer 3

You want semicolons inside the function like so:
- (IBAction)buttonPressed {
count++;
scoreLabel.text = [NSString stringWithFormat:#"Score \n %i", count];
}
This is the correct syntax to use.