Question

Working on a tutorial with CLLocationManager where I set the delegate within the init method:

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) 
    {
        locationManager = [[CLLocationManager alloc] init];
        [locationManager setDelegate:self];
        [locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
        [locationManager startUpdatingLocation];
    }
    return self;
}

Set the delegate:

[locationManager setDelegate:self];

In another tutorial I set the delegate in a header file:

@interface MyViewController : UIViewController <CLLocationManagerDelegate>

Are they equal? Whats the difference (if there is one)?

Answer 1

You will need both of them if you want to implement and get callbacks from the delegate of CLLocationManger

You specify this in the header

@interface MyViewController : UIViewController <CLLocationManagerDelegate>

This tells xcode that MyViewController will implement the CLLocationManagerDelegate methods. If there are non-optional delegate methods, xcode will remind you to implement them.

With the line below

[locationManager setDelegate:self];

You tell your instance of CLLocationManager (locationManager) that MyViewController (self) will be the delegate and it should call all the implemented CLLocationManagerDelegate methods that you have implemented (if needed)