所以我遇到的问题是当我尝试以这种方式加载视频时：
-(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];
}
由于NSException，我在代码中指定的地方抛出了SIGARBT。但是，如果我只是写出字符串，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];
}
代码完美无缺。问题是什么？我NSLog tempName以确保它保持正确的字符串，它是。此外，sharedManager.vidName是NSMutableString。这是唯一一个让我无法完成高级项目和大学毕业的问题，所以非常感谢任何帮助。谢谢。
以下是我在日志中的内容：
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'
答案 0 :(得分：1)
查看控制台日志，看看是否有类似的内容：
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSURL initFileURLWithPath:]: nil string parameter'
如果是这样，那么sharedManager.vidName肯定与@“vid_name”不同，并且无法成功找到路径。也许@“vid_name.mp4”？那你可能只需要替换
NSString *url = [[NSBundle mainBundle] pathForResource:tempName ofType:@"mp4"];
与
NSString *url = [[NSBundle mainBundle] pathForResource:tempName ofType:nil];
试一试。
答案 1 :(得分：0)
您是否在错误中看到了这一行：
'NSInvalidArgumentException', reason: '*** -[NSURL initFileURLWithPath:]: nil string parameter'
意味着第二个只能起作用，因为iVar'url'不是sharedManager.vidName;不是NULL，如果你使用NSLog，我可以保证是nil。
答案 2 :(得分：0)
这是我见过的最晦涩难懂的东西之一...... iOS中的其中一个。我对名为GetLocationVideo.m4v的文件有同样的问题。我有一些其他文件工作正常。其中一个是MVI_1723.MOV。经过几个小时的工作，应该花费超过1秒的时间。我从xcode资源中的引用列表中删除了GetLocationVideo.m4v。我将GetLocationVideo.m4v文件重命名为MVI_1724.MOV，将其重新放回Xcode的resources文件夹。重新运行应用程序，它工作正常。似乎xcode需要以大写字母扩展视频文件。 .MOV会奏效。我没有尝试过.MP4或任何扩展程序。为什么？我不知道。有太多的错误或事情没有任何意义，你必须阅读10,000页文档，甚至不值得尝试理解为什么。继续前进，直到下一个重要的事情发生在你面前。我希望这能帮助其他人在同样的道路上挣扎。