我在应用上安装了Crashlytics，但我发现了一个影响某些用户的错误，我自己无法复制它。
错误为EXC_BAD_ACCESS KERN_INVALID_ADDRESS。我查看了this post re: EXC_BAD_ACCESS，但我无法弄清楚我应该在崩溃日志中查找问题的位置。
根据以下崩溃日志，是否有一个地方我应该设置一个断点来检查nils？
Thread 0:
Crashed: com.apple.main-thread
EXC_BAD_ACCESS KERN_INVALID_ADDRESS 0x00000000154d9050
raw
0 libobjc.A.dylib objc_msgSend + 16
1 libAVFAudio.dylib -[AVAudioPlayer(AVAudioPlayerPriv) finishedPlaying:] + 92
2 Foundation __NSThreadPerformPerform + 340
3 CoreFoundation __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
4 CoreFoundation __CFRunLoopDoSources0 + 540
5 CoreFoundation __CFRunLoopRun + 724
6 CoreFoundation CFRunLoopRunSpecific + 384
7 GraphicsServices GSEventRunModal + 180
8 UIKit UIApplicationMain + 204
9 My App AppDelegate.swift line 19 main
10 libdyld.dylib start + 4
Thread 1: com.apple.libdispatch-manager
0 libsystem_kernel.dylib kevent_qos + 8
1 libdispatch.dylib _dispatch_mgr_invoke + 232
2 libdispatch.dylib _dispatch_source_invoke + 50
Thread 2: com.twitter.crashlytics.ios.MachExceptionServer
0 My App CLSProcess.c line 374 CLSProcessRecordAllThreads
1 My App CLSProcess.c line 374 CLSProcessRecordAllThreads
2 My App CLSProcess.c line 398 CLSProcessRecordAllThreads
3 My App CLSHandler.m line 24 CLSHandler
4 My App CLSMachException.c line 443 CLSMachExceptionServer
5 libsystem_pthread.dylib _pthread_body + 156
6 libsystem_pthread.dylib _pthread_body + 154
7 libsystem_pthread.dylib thread_start + 4
Thread 3: com.apple.NSURLConnectionLoader
0 libsystem_kernel.dylib mach_msg_trap + 8
1 libsystem_kernel.dylib mach_msg + 72
2 CoreFoundation __CFRunLoopServiceMachPort + 196
3 CoreFoundation __CFRunLoopRun + 1032
4 CoreFoundation CFRunLoopRunSpecific + 384
5 CFNetwork +[NSURLConnection(Loader) _resourceLoadLoop:] + 412
6 Foundation __NSThread__start__ + 1000
7 libsystem_pthread.dylib _pthread_body + 156
8 libsystem_pthread.dylib _pthread_body + 154
9 libsystem_pthread.dylib thread_start + 4
Thread 4: com.apple.CFSocket.private
0 libsystem_kernel.dylib __select + 8
1 CoreFoundation __CFSocketManager + 648
2 libsystem_pthread.dylib _pthread_body + 156
3 libsystem_pthread.dylib _pthread_body + 154
4 libsystem_pthread.dylib thread_start + 4
Thread 5: com.apple.coreaudio.AQClient
0 libsystem_kernel.dylib mach_msg_trap + 8
1 libsystem_kernel.dylib mach_msg + 72
2 CoreFoundation __CFRunLoopServiceMachPort + 196
3 CoreFoundation __CFRunLoopRun + 1032
4 CoreFoundation CFRunLoopRunSpecific + 384
5 AudioToolbox GenericRunLoopThread::Entry(void*) + 164
6 AudioToolbox CAPThread::Entry(CAPThread*) + 124
7 libsystem_pthread.dylib _pthread_body + 156
8 libsystem_pthread.dylib _pthread_body + 154
9 libsystem_pthread.dylib thread_start + 4
Thread 6: Thread
0 libsystem_kernel.dylib __workq_kernreturn + 8
1 libsystem_pthread.dylib _pthread_wqthread + 1284
2 libsystem_pthread.dylib start_wqthread + 4
Thread 7: Thread
0 libsystem_kernel.dylib __workq_kernreturn + 8
1 libsystem_pthread.dylib _pthread_wqthread + 1284
2 libsystem_pthread.dylib start_wqthread + 4
Thread 8: Thread
0 libsystem_kernel.dylib __workq_kernreturn + 8
1 libsystem_pthread.dylib _pthread_wqthread + 1284
2 libsystem_pthread.dylib start_wqthread + 4
Thread 9: Thread
0 libsystem_kernel.dylib __workq_kernreturn + 8
1 libsystem_pthread.dylib _pthread_wqthread + 1284
2 libsystem_pthread.dylib start_wqthread + 4
更新
在Rog的建议下，我查看了调用AVAudioPlayer的方法。
我有一个名为MP3Player的班级。它有两种初始化方法：
1）播放单个文件
init(fileName: String) {
// Need to get location of file in bundle
let fileNamePath: String = NSBundle.mainBundle().pathForResource(fileName, ofType: "")!
// Then add the filename to the tracks array of strings
tracks.append(fileNamePath)
super.init()
queueTrack()
}
2）播放一系列文件
init(arrayOfMP3FileNames: NSArray) {
for fileName in arrayOfMP3FileNames {
// get the path of the file...
let fileNamePath: String = NSBundle.mainBundle().pathForResource(fileName as? String, ofType: "")!
// ...and add it to the tracks array
tracks.append(fileNamePath)
}
super.init()
queueTrack()
}
queueTrack方法似乎包含了我的部分问题：
func queueTrack() {
// I have no idea what possessed me to put this in, but I think it's the majority
// of my problem
// ** TOOK FOLLOWING 2 LINES OUT **
// if (player != nil) {
// player = nil
// }
let url = NSURL.fileURLWithPath(tracks[currentTrackIndex] as String)
do {
player = try AVAudioPlayer(contentsOfURL: url) // Thread 1: breakpoint 1.1
player?.delegate = self
player?.prepareToPlay()
} catch let error as NSError {
NSLog("Unresolved error \(error.debugDescription)")
// SHOW ALERT OR SOMETHING
}
}
在断点导航器中，我为“All Exceptions”添加了异常断点。如果我在播放声音的同时播放另一个声音，我会在do {}声明的第一行听到异常。它不会在模拟器或设备上崩溃，但我认为我需要清理它，所以我没有得到例外。任何有关解决此问题的建议都将不胜感激。