[英]Swift - Audio - keep getting error for button sound
I'm just beginning to develop in iOS and trying to create simple app which change image and play sound again and again when I press a button but keep getting error when run it. 我才刚刚开始在iOS中进行开发,并试图创建一个简单的应用程序,当我按下一个按钮时,它会改变图像并一次又一次地播放声音,但是在运行它时会不断出错。
Error "fatal error: unexpectedly found nil while unwrapping an Optional value (lldb)" 错误“严重错误:解开可选值(lldb)时意外发现nil”
Here is my "view controller.swift" 这是我的“ view controller.swift”
import UIKit
import AVFoundation
class ViewController: UIViewController {
let image0 = UIImage(named: "button.png")
let image1 = UIImage(named: "buttonPressed.png")
var sound = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("sound", ofType: "m4a")!)
var player = AVAudioPlayer()
@IBOutlet weak var clicker: UIButton!
@IBAction func clickerPressed(sender: UIButton) {
sender.setImage(image1, forState:.Highlighted)
player.stop()
player.currentTime = 0
player.play()
}
override func viewDidLoad() {
super.viewDidLoad()
clicker.setImage(image0, forState:.Normal)
clicker.setImage(image1, forState:.Highlighted)
player = AVAudioPlayer(contentsOfURL: sound, error: nil)
player.prepareToPlay()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
} }
Thank you, Michael. 谢谢迈克尔。 Problem resolved.
问题已解决。 Apparently there was something wrong with original .m4a file.
原始的.m4a文件显然出问题了。 I converted it to .mp3 and everything works great.
我将其转换为.mp3,一切正常。
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