xcode 录制音频并永久保存在 iOS 中
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Record audio and save permanently in iOS
提问by es1
I have made 2 iPhone apps which can record audio and save it to a file and play it back again.
我制作了 2 个 iPhone 应用程序，它们可以录制音频并将其保存到文件中并再次播放。
One of them uses AVAudiorecorder and AVAudioplayer. The second one is Apple's SpeakHereexample with Audio Queues.
其中之一使用 AVAudiorecorder 和 AVAudioplayer。第二个是 Apple 的带有音频队列的SpeakHere示例。
Both run on Simulater as well as the Device.
两者都在模拟器和设备上运行。
BUT when I restart either app the recorded file is not found!!! I've tried all possible suggestions found on stackoverflow but it still doesnt work!
但是当我重新启动任一应用程序时，都找不到录制的文件！！！我已经尝试了在 stackoverflow 上找到的所有可能的建议，但它仍然不起作用！
This is what I use to save the file:
这是我用来保存文件的内容：
NSArray *dirPaths;
NSString *docsDir;
dirPaths = NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask, YES);
docsDir = [dirPaths objectAtIndex:0];
NSString *soundFilePath = [docsDir stringByAppendingPathComponent:@"sound1.caf"];
NSURL *soundFileURL = [NSURL fileURLWithPath:soundFilePath];
回答by es1
Ok I finally solved it. The problem was that I was setting up the AVAudioRecorder and file the path in the viewLoad of my ViewController.m overwriting existing files with the same name.
好的，我终于解决了。问题是我正在设置 AVAudioRecorder 并在我的 ViewController.m 的 viewLoad 中写入路径，覆盖具有相同名称的现有文件。
- After recording and saving the audio to file and stopping the app, I could find the file in Finder. (/Users/xxxxx/Library/Application Support/iPhone Simulator/6.0/Applications/0F107E80-27E3-4F7C-AB07-9465B575EDAB/Documents/sound1.caf)
When I restarted the application the setup code for the recorder (from viewLoad) would just overwrite my old file called:
sound1.caf
with a new one. Same name but no content.
The play back would just play an empty new file. --> No Sound obviously.
- 录制音频并将其保存到文件并停止应用程序后，我可以在 Finder 中找到该文件。(/Users/xxxxx/Library/Application Support/iPhone Simulator/6.0/Applications/0F107E80-27E3-4F7C-AB07-9465B575EDAB/Documents/sound1.caf)
当我重新启动应用程序时，记录器的设置代码（来自 viewLoad）只会覆盖我的旧文件：
sound1.caf
用一个新的。同名但无内容。
回放只会播放一个空的新文件。--> 显然没有声音。
So here is what I did:
所以这就是我所做的：
I used NSUserdefaults to save the path of the recorded file name to be retrieved later in my playBack method.
我使用 NSUserdefaults 来保存录制文件名的路径，以便稍后在我的 playBack 方法中检索。
cleaned viewLoad in ViewController.m :
清除 ViewController.m 中的 viewLoad ：
- (void)viewDidLoad
{
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];
[audioSession setActive:YES error:nil];
[recorder setDelegate:self];
[super viewDidLoad];
}
edited record in ViewController.m :
在 ViewController.m 中编辑记录：
- (IBAction) record
{
NSError *error;
// Recording settings
NSMutableDictionary *settings = [NSMutableDictionary dictionary];
[settings setValue: [NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
[settings setValue: [NSNumber numberWithFloat:8000.0] forKey:AVSampleRateKey];
[settings setValue: [NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey];
[settings setValue: [NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
[settings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
[settings setValue: [NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];
[settings setValue: [NSNumber numberWithInt: AVAudioQualityMax] forKey:AVEncoderAudioQualityKey];
NSArray *searchPaths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentPath_ = [searchPaths objectAtIndex: 0];
NSString *pathToSave = [documentPath_ stringByAppendingPathComponent:[self dateString]];
// File URL
NSURL *url = [NSURL fileURLWithPath:pathToSave];//FILEPATH];
//Save recording path to preferences
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
[prefs setURL:url forKey:@"Test1"];
[prefs synchronize];
// Create recorder
recorder = [[AVAudioRecorder alloc] initWithURL:url settings:settings error:&error];
[recorder prepareToRecord];
[recorder record];
}
edited playback in ViewController.m:
在 ViewController.m 中编辑播放：
-(IBAction)playBack
{
AVAudioSession *audioSession = [AVAudioSession sharedInstance];
[audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
[audioSession setActive:YES error:nil];
//Load recording path from preferences
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
temporaryRecFile = [prefs URLForKey:@"Test1"];
player = [[AVAudioPlayer alloc] initWithContentsOfURL:temporaryRecFile error:nil];
player.delegate = self;
[player setNumberOfLoops:0];
player.volume = 1;
[player prepareToPlay];
[player play];
}
and added a new dateString method to ViewController.m:
并向 ViewController.m 添加了一个新的 dateString 方法：
- (NSString *) dateString
{
// return a formatted string for a file name
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"ddMMMYY_hhmmssa";
return [[formatter stringFromDate:[NSDate date]] stringByAppendingString:@".aif"];
}
Now it can load the last recorded file via NSUserdefaults loading it with:
现在它可以通过 NSUserdefaults 加载最后记录的文件：
//Load recording path from preferences
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
temporaryRecFile = [prefs URLForKey:@"Test1"];
player = [[AVAudioPlayer alloc] initWithContentsOfURL:temporaryRecFile error:nil];
in (IBAction)playBack. temporaryRecFile is a NSURL variable in my ViewController class.
在（IBAction）播放中。tempRecFile 是我的 ViewController 类中的 NSURL 变量。
declared as following ViewController.h :
声明如下 ViewController.h ：
@interface SoundRecViewController : UIViewController <AVAudioSessionDelegate,AVAudioRecorderDelegate, AVAudioPlayerDelegate>
{
......
......
NSURL *temporaryRecFile;
AVAudioRecorder *recorder;
AVAudioPlayer *player;
}
......
......
@end
