致命錯誤：意外發現零而展開

Question

爲什麼我收到主題1：EXE_BAD_INSTRUCTION

這是我的代碼

override func viewDidAppear(animated: Bool) { 

    var fileclocaiton = NSString(string: NSBundle.mainBundle().pathForResource(self.navigationItem.title, ofType: "mp3")!) 
    var error: NSError? = nil 
    player = AVAudioPlayer(contentsOfURL: NSURL(string: fileclocaiton as String), error: &error) 
} 

Answer 1

var fileclocaiton = NSString(string: NSBundle.mainBundle().pathForResource(self.navigationItem.title, ofType: "mp3")!) 

此行是崩潰的源頭。你確定你有和navigationItem.title相同的資源嗎？ navigationItem.title與UIViewController的title屬性相同嗎？您必須嘗試並確保該類型的資源存在。你能避免碰撞的情況下，如果讓作爲資源沒有使用發現，

if let fileclocaiton = NSString(string: NSBundle.mainBundle().pathForResource(self.navigationItem.title, ofType: "mp3")) { 

    ... do rest of your coding here. 
}