我收到SIGABRT当我尝试加载视频（Objective-C的）

Question

所以我遇到的问题是，当我尝试加载视频这种方式：

-(void) viewDidLoad 
{ 
MyManager *sharedManager = [MyManager sharedManager]; 
[super viewDidLoad]; 
NSString *tempName = sharedManager.vidName; 
NSLog(@"%@", tempName); 

//This is where the problem is being caused 
NSString *url = [[NSBundle mainBundle] pathForResource:tempName ofType:@"mp4"]; 
//This is where I'm getting the SIGABRT thrown 
MPMoviePlayerController* theMovie = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:url]]; 

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(movieFinishedCallBack:) name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie]; 
theMovie.scalingMode = MPMovieScalingModeAspectFit; 
[theMovie.view setFrame:self.view.bounds]; 
[self.view addSubview:theMovie.view]; 
[theMovie play]; 

} 

我得到一个SIGARBT抛出我在代码中由于NSException而指定的地方。但是，如果我简单地写出字符串，如下所示：

- (void)viewDidLoad 
{ 
MyManager *sharedManager = [MyManager sharedManager]; 
[super viewDidLoad]; 
NSString *tempName = sharedManager.vidName; 
NSLog(@"%@", tempName); 

//This is the line I changed 
NSString *url = [[NSBundle mainBundle] pathForResource:@"vid_name" ofType:@"mp4"]; 

MPMoviePlayerController* theMovie = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:url]]; 

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(movieFinishedCallBack:) name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie]; 
theMovie.scalingMode = MPMovieScalingModeAspectFit; 
[theMovie.view setFrame:self.view.bounds]; 
[self.view addSubview:theMovie.view]; 
[theMovie play]; 

} 

代码工作得很好。问题是什么？我NSLog的tempName，以确保它保持正确的字符串，它是。另外，sharedManager.vidName是一个NSMutableString。这是我完成高级项目和大学毕业后留下的唯一问题，所以任何帮助都将不胜感激。谢谢。

这里是我得到的日志中：

2012-03-26 22:04:52.115 SeniorProject[20502:207] Barbell Incline Bench Press - Medium Grip 
2012-03-26 22:04:52.120 SeniorProject[20502:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSURL initFileURLWithPath:]: nil string parameter' 
*** Call stack at first throw: 
(
0 CoreFoundation      0x00fb15a9 __exceptionPreprocess + 185 
1 libobjc.A.dylib      0x01105313 objc_exception_throw + 44 
2 CoreFoundation      0x00f69ef8 +[NSException raise:format:arguments:] + 136 
3 CoreFoundation      0x00f69e6a +[NSException raise:format:] + 58 
4 Foundation       0x007e3ab6 -[NSURL(NSURL) initFileURLWithPath:] + 90 
5 Foundation       0x007e3a44 +[NSURL(NSURL) fileURLWithPath:] + 72 
6 SeniorProject      0x000105f4 -[Video viewDidLoad] + 420 
7 UIKit        0x000ef089 -[UIViewController view] + 179 
8 UIKit        0x000ed482 -[UIViewController contentScrollView] + 42 
9 UIKit        0x000fdf25 -[UINavigationController _computeAndApplyScrollContentInsetDeltaForViewController:] + 48 
10 UIKit        0x000fc555 -[UINavigationController _layoutViewController:] + 43 
11 UIKit        0x000fd870 -[UINavigationController _startTransition:fromViewController:toViewController:] + 524 
12 UIKit        0x000f832a -[UINavigationController _startDeferredTransitionIfNeeded] + 266 
13 UIKit        0x000ff562 -[UINavigationController pushViewController:transition:forceImmediate:] + 932 
14 UIKit        0x000f81c4 -[UINavigationController pushViewController:animated:] + 62 
15 SeniorProject      0x00005998 -[ExerciseList goToVideo:] + 328 
16 UIKit        0x0003f4fd -[UIApplication sendAction:to:from:forEvent:] + 119 
17 UIKit        0x000cf799 -[UIControl sendAction:to:forEvent:] + 67 
18 UIKit        0x000d1c2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527 
19 UIKit        0x000d07d8 -[UIControl touchesEnded:withEvent:] + 458 
20 UIKit        0x00063ded -[UIWindow _sendTouchesForEvent:] + 567 
21 UIKit        0x00044c37 -[UIApplication sendEvent:] + 447 
22 UIKit        0x00049f2e _UIApplicationHandleEvent + 7576 
23 GraphicsServices     0x011ea992 PurpleEventCallback + 1550 
24 CoreFoundation      0x00f92944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52 
25 CoreFoundation      0x00ef2cf7 __CFRunLoopDoSource1 + 215 
26 CoreFoundation      0x00eeff83 __CFRunLoopRun + 979 
27 CoreFoundation      0x00eef840 CFRunLoopRunSpecific + 208 
28 CoreFoundation      0x00eef761 CFRunLoopRunInMode + 97 
29 GraphicsServices     0x011e91c4 GSEventRunModal + 217 
30 GraphicsServices     0x011e9289 GSEventRun + 115 
31 UIKit        0x0004dc93 UIApplicationMain + 1160 
32 SeniorProject      0x00001b39 main + 121 
33 SeniorProject      0x00001ab5 start + 53 
) 
terminate called after throwing an instance of 'NSException' 

Answer 1

你看到这行错误：

'NSInvalidArgumentException', reason: '*** -[NSURL initFileURLWithPath:]: nil string parameter' 

意思就是第二个只工作，因为伊娃“网址”不为NULL不像sharedManager.vidName;，这点我可以保证的是零，如果你的NSLog它。

Answer 2

退房控制台日志，看看它说是这样的：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSURL initFileURLWithPath:]: nil string parameter' 

如果是这样，那么sharedManager.vidName是与@“vid_name”完全不同，并且路径无法成功找到。也许@“vid_name.mp4”？那么你可能只需要更换

NSString *url = [[NSBundle mainBundle] pathForResource:tempName ofType:@"mp4"]; 

与

NSString *url = [[NSBundle mainBundle] pathForResource:tempName ofType:nil]; 

试试看吧。

Answer 3

这是我见过的最晦涩的事情之一...... iOS中的丰富内容之一。我和一个名为GetLocationVideo.m4v的文件有同样的问题。我有一些其他文件工作正常。其中之一是MVI_1723.MOV。经过几个小时的工作，应该需要超过1秒钟。我从xcode资源中的参考列表中删除了GetLocationVideo.m4v。我将GetLocationVideo.m4v文件重命名为MVI_1724.MOV，并将其放回到Xcode的资源文件夹中。重新运行应用程序，它运行良好。看来，xcode需要在大写视频文件的扩展名。 .MOV将工作。我还没有尝试.MP4或任何扩展名。为什么？我不知道。有太多的错误或东西没有任何意义，你必须阅读10,000页的文档，甚至不值得试图理解为什么。只要继续下去，直到下一件大事出现在你面前。我希望这能够帮助其他人在同样的道路上挣扎。