How to solve the warning: Sending 'ViewController *const __strong' to parameter of incompatible type 'id<AVAudioPlayerDelegate>?
avfoundation, ios, iphone
Solution
Conform to the `AVAudioPlayerDelegate` protocol in your header file and the warning will go away. By not declaring that a class conforms to a given protocol, the compiler cannot guarantee (well, at least warn) about your failure to implement the methods required of it. The following code is a corrected version that will suppress the warning.
@interface ViewController : UIViewController <AVAudioPlayerDelegate>
@end
Problem
The following code gave a warning of `Sending 'ViewController *const __strong' to parameter of incompatible type 'id<AVAudioPlayerDelegate>'` (it is the third line in the following code): ``` NSURL *sound0URL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"0" ofType:@"aiff"]]; audioPlayer0 = [[AVAudioPlayer alloc] initWithContentsOfURL:sound0URL error:nil]; [audioPlayer0 setDelegate: self]; // <--- this line causes the warning [audioPlayer0 prepareToPlay]; audioPlayer0.currentTime = 0; [audioPlayer0 play]; ``` How can it be fixed? I have this code in the `ViewController`'s instance method of `viewDidLoad`. There was another question similar but that was a class method: Incompatible pointer types assigning to 'id<AVAudioPlayerDelegate>' from 'Class'