Why is contactDelegate not being set?

Question

I'm getting the following warning from the line

self.physicsWorld.contactDelegate = self;

Assigning to 'id' from incompatible type 'PlayLevel *__strong'

-(id)initWithSize:(CGSize)size level:(int)level{
    if (self = [super initWithSize:size]) {
        _level = level;
        self.physicsWorld.gravity = CGVectorMake(0,0);
        self.physicsWorld.contactDelegate = self;

Not at all sure what's causing it. This is what my header looks like:

#import <SpriteKit/SpriteKit.h>

@interface PlayLevel : SKScene

-(id)initWithSize:(CGSize)size level:(int)level;

@end

Any idea's what's causing it? I kind of need a contactDelegate. Thanks!

Answer 1

You should declarer on your class interface (inside <>) that your class implement the delegate.

Answer 2

you will have to add the delegate reference in your header file. For example if we are using the UINavigationController delegates we add <UINavigationControllerDelegate> in the header file. Similary you will have to add the contact delegate

Answer 3

In your header where you declare that PlayLevel extends SKScene, you need to also declare that it implements the SKContactDelegate interface like so:

@interface PlayLevel : SKScene <SKPhysicsContactDelegate>