我正在考虑为iPhone构建这个小项目，但是当我在iOS模拟器上部署它时，我收到错误“libc ++ abi.dylib：以NSException类型的未捕获异常终止”。
代码非常简单，这里是：
WHGViewController.h：
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@interface WHGViewController : UIViewController <AVAudioRecorderDelegate, AVAudioPlayerDelegate>
@property (strong, nonatomic) AVAudioRecorder* rec;
@property (strong, nonatomic) AVAudioPlayer* ply;
@property (strong, nonatomic) IBOutlet UIButton *recBtn;
@property (strong, nonatomic) IBOutlet UIButton *plyBtn;
@property (strong, nonatomic) IBOutlet UIButton *stopBtn;
- (IBAction)recordAudio:(id)sender;
- (IBAction)playAudio:(id)sender;
- (IBAction)stop:(id)sender;
@end
WHGViewController.m：
#import "WHGViewController.h"
@interface WHGViewController ()
@end
@implementation WHGViewController
- (void)viewDidLoad
{
[super viewDidLoad];
_plyBtn.enabled = NO;
_stopBtn.enabled = NO;
NSArray *dirPaths;
NSString *docsDir;
dirPaths = NSSearchPathForDirectoriesInDomains(NSDocumentationDirectory, NSUserDomainMask, YES);
docsDir = dirPaths[0];
NSString *soundFilePath = [docsDir stringByAppendingPathComponent:@"test.caf"];
NSURL *soundFileURL = [NSURL fileURLWithPath:soundFilePath];
NSDictionary *recordSettings = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:AVAudioQualityMin],
AVEncoderAudioQualityKey,
[NSNumber numberWithInt:16],
AVEncoderBitRateKey,
[NSNumber numberWithInt:2],
AVNumberOfChannelsKey,
[NSNumber numberWithFloat:44100.0],
AVSampleRateKey,
nil];
NSError *error = nil;
_rec = [[AVAudioRecorder alloc] initWithURL:soundFileURL settings:recordSettings error:&error];
if(error){
NSLog(@"error: %@", [error localizedDescription]);
} else {
[_rec prepareToRecord];
}
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (IBAction)recordAudio:(id)sender {
_plyBtn.enabled = NO;
_stopBtn.enabled = YES;
[_rec record];
}
- (IBAction)playAudio:(id)sender {
if(!_rec.recording){
_recBtn.enabled = NO;
_stopBtn.enabled = YES;
NSError *error;
_ply = [[AVAudioPlayer alloc] initWithContentsOfURL:_rec.url error:&error];
_ply.delegate = self;
if(error){
NSLog(@"error: %@", [error localizedDescription]);
} else {
[_ply play];
}
}
}
- (IBAction)stop:(id)sender {
_stopBtn.enabled = NO;
_recBtn.enabled = YES;
_plyBtn.enabled = YES;
if(_rec.recording) {
[_rec stop];
} else if(_ply.playing) {
[_ply stop];
}
}
- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag {
_recBtn.enabled = YES;
}
- (void)audioPlayerDecodeErrorDidOccur:(AVAudioPlayer *)player error:(NSError *)error {
NSLog(@"Decode error did occur");
}
- (void)audioRecorderDidFinishRecording:(AVAudioRecorder *)recorder successfully:(BOOL)flag {
}
- (void)audioRecorderEncodeErrorDidOccur:(AVAudioRecorder *)recorder error:(NSError *)error {
NSLog(@"Encode error did occur");
}
@end
以下是完整的崩溃报告：
2013-11-15 23:51:08.814 WhisperClient[51402:70b] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<WHGViewController 0x9564950> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key playAudio.'
*** First throw call stack:
(
0 CoreFoundation 0x019665e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x016e98b6 objc_exception_throw + 44
2 CoreFoundation 0x019f66a1 -[NSException raise] + 17
3 Foundation 0x013aa9ee -[NSObject(NSKeyValueCoding) setValue:forUndefinedKey:] + 282
4 Foundation 0x01316cfb _NSSetUsingKeyValueSetter + 88
5 Foundation 0x01316253 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 267
6 Foundation 0x0137870a -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 412
7 UIKit 0x006f9a15 -[UIRuntimeOutletConnection connect] + 106
8 libobjc.A.dylib 0x016fb7d2 -[NSObject performSelector:] + 62
9 CoreFoundation 0x01961b6a -[NSArray makeObjectsPerformSelector:] + 314
10 UIKit 0x006f856e -[UINib instantiateWithOwner:options:] + 1417
11 UIKit 0x0056a605 -[UIViewController _loadViewFromNibNamed:bundle:] + 280
12 UIKit 0x0056adad -[UIViewController loadView] + 302
13 UIKit 0x0056b0ae -[UIViewController loadViewIfRequired] + 78
14 UIKit 0x0056b5b4 -[UIViewController view] + 35
15 UIKit 0x004939fd -[UIWindow addRootViewControllerViewIfPossible] + 66
16 UIKit 0x00493d97 -[UIWindow _setHidden:forced:] + 312
17 UIKit 0x0049402d -[UIWindow _orderFrontWithoutMakingKey] + 49
18 UIKit 0x0049e89a -[UIWindow makeKeyAndVisible] + 65
19 UIKit 0x00451cd0 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1851
20 UIKit 0x004563a8 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 824
21 UIKit 0x0046a87c -[UIApplication handleEvent:withNewEvent:] + 3447
22 UIKit 0x0046ade9 -[UIApplication sendEvent:] + 85
23 UIKit 0x00458025 _UIApplicationHandleEvent + 736
24 GraphicsServices 0x02f192f6 _PurpleEventCallback + 776
25 GraphicsServices 0x02f18e01 PurpleEventCallback + 46
26 CoreFoundation 0x018e1d65 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
27 CoreFoundation 0x018e1a9b __CFRunLoopDoSource1 + 523
28 CoreFoundation 0x0190c77c __CFRunLoopRun + 2156
29 CoreFoundation 0x0190bac3 CFRunLoopRunSpecific + 467
30 CoreFoundation 0x0190b8db CFRunLoopRunInMode + 123
31 UIKit 0x00455add -[UIApplication _run] + 840
32 UIKit 0x00457d3b UIApplicationMain + 1225
33 WhisperClient 0x0000363d main + 141
34 libdyld.dylib 0x03afb70d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
如果有人能告诉我为什么我会得到未被捕获的例外，或者甚至更好，我在哪里得到它，我会非常感激。提前谢谢！
答案 0 :(得分：1)
这意味着您的IBActions或IBOutlets文件中的storyboard或xib之一未正确连接。它的名称是playAudio，它位于名为WHGViewController的视图控制器中：
2013-11-15 23:51:08.814 WhisperClient[51402:70b]
***
Terminating app due to uncaught exception 'NSUnknownKeyException',
//Here it says that the error is in WHGViewController
reason: '[<WHGViewController 0x9564950> setValue:forUndefinedKey:]:
//Here it says that the IBAction/IBOutlet is named playAudio
this class is not key value coding-compliant for the key playAudio.'
***
只需进入视图控制器，然后查看所有插座和操作的连接情况。如果看到黄色三角形，表示未定义该值，则必须从视图控制器中删除它。
playAudio未定义，但WHGViewController正在尝试使用它，因此当它到达playAudio时，它无法找到它，因此您的应用只是崩溃。
答案 1 :(得分：0)
该错误实质上意味着您的IBOutlets for buttons未正确连接到XIB / storyboard。请尝试删除并重新连接XIB / Storyboard中的插座，这样可以解决问题。