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

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 

@interface xyzViewCont         


        

Answer 1

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 2

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 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.