What can I do to fix this error? - swift

Question

I get an error every time I try to run stating
fatal error: unexpectedly found nil while unwrapping an Optional value (lldb).
Could someone explain why? heres the code
import UIKit
import AVFoundation
class ViewController: UIViewController {
var player: AVAudioPlayer = AVAudioPlayer()
override func viewDidLoad() {
super.viewDidLoad()
let audioPath = NSBundle.mainBundle().pathForResource("Belly - Might Not", ofType: "mp3")!
do {
try player = AVAudioPlayer(contentsOfURL: NSURL(fileURLWithPath: audioPath))
player.play()
} catch {
// Process error here
}
}
}

Answer 1

This error is almost always caused by force unwrapping an object, i.e. the "!"operator. for your code, it's likely this line:
let audioPath = NSBundle.mainBundle().pathForResource("Belly - Might Not", ofType: "mp3")!
Chances are t can't find that file. To be safe with it and handle this error case, use this:
if let audioPath = NSBundle.mainBundle().pathForResource("Belly - Might Not", ofType: "mp3") {
/* do what you need to with the path*/
}
else{
/* handle error case */
}

Answer 2

You're force-unwrapping the optional in your line of code:
let audioPath = NSBundle.mainBundle().pathForResource("Belly - Might Not", ofType: "mp3")!
This file can returns an optional in case of not exist the resource, avoid the force unwrapping of the optional instead use optional-binding or a guard statement like in the following way. It's always recommend not make force-unwrapping of an optional because you're telling to the compiler that you know that always be different of nil and if it's happen you get an runtime error.
if let audioPath = NSBundle.mainBundle().pathForResource("Belly - Might Not", ofType: "mp3") {
do {
try player = AVAudioPlayer(contentsOfURL: NSURL(fileURLWithPath: audioPath))
player.play()
} catch {
// Process error here
}
}
Or with guard:
guard let audioPath = NSBundle.mainBundle().pathForResource("Belly - Might Not", ofType: "mp3") else { return }
do {
try player = AVAudioPlayer(contentsOfURL: NSURL(fileURLWithPath: audioPath))
player.play()
} catch {
// Process error here
}
I hope this help you.

Answer 3

May be audio file not found. Try like this
if let audioPath = NSBundle.mainBundle().pathForResource("Belly - Might Not", ofType: "mp3"){
do {
try player = AVAudioPlayer(contentsOfURL: NSURL(fileURLWithPath: audioPath))
player.play()
} catch {
// Process error here
}
}else{
print("path not found")
}