Здравствуйте, хорошо, верно, у меня есть представление, называемое RecordViewController, в котором есть функция диктофона, поэтому, как только пользователь нажимает «запись», он записывает свой голос, я также создал кнопку «назад».Но после нажатия этой кнопки назад запись голоса также прекращается.Я хочу, чтобы, как только пользователь вернулся, он все еще записывал свой голос.Вот код, который я использовал:
.h
#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
#import <CoreAudio/CoreAudioTypes.h>
@interface RecordViewController : UIViewController <AVAudioRecorderDelegate> {
IBOutlet UIButton * btnStart;
IBOutlet UIButton * btnPlay;
IBOutlet UIActivityIndicatorView * actSpinner;
BOOL toggle;
NSURL * recordedTmpFile;
AVAudioRecorder * recorder;
NSError * error;
NSTimer *theTimer;
IBOutlet UILabel *seconds;
int mainInt;
NSString *timeRemainingString;
}
@property (nonatomic,retain)IBOutlet UIActivityIndicatorView * actSpinner;
@property (nonatomic,retain)IBOutlet UIButton * btnStart;
@property (nonatomic,retain)IBOutlet UIButton * btnPlay;
- (IBAction) start_button_pressed;
- (IBAction) play_button_pressed;
- (IBAction)goBack:(id)sender;
- (void)countUp;
@end
.m
#import "RecordViewController.h"
@implementation RecordViewController
@synthesize actSpinner, btnStart, btnPlay;
- (void)countUp {
mainInt += 1;
seconds.text = [NSString stringWithFormat:@"%02d", mainInt];
}
- (IBAction)goBack:(id)sender; {
[self dismissModalViewControllerAnimated:YES];
}
- (void)viewDidLoad {
[super viewDidLoad];
//Start the toggle in true mode.
toggle = YES;
btnPlay.hidden = YES;
//Instanciate an instance of the AVAudioSession object.
AVAudioSession * audioSession = [AVAudioSession sharedInstance];
//Setup the audioSession for playback and record.
//We could just use record and then switch it to playback leter, but
//since we are going to do both lets set it up once.
[audioSession setCategory:AVAudioSessionCategoryPlayAndRecord
error: &error];
//Activate the session
[audioSession setActive:YES error: &error];
}
- (IBAction)start_button_pressed {
if(toggle) {
toggle = NO;
[actSpinner startAnimating];
[btnStart setImage:[UIImage imageNamed:@"stoprecording.png"]
forState:UIControlStateNormal];
mainInt = 0;
theTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(countUp) userInfo:nil repeats:YES];
btnPlay.enabled = toggle;
btnPlay.hidden = !toggle;
//Begin the recording session.
//Error handling removed. Please add to your own code.
//Setup the dictionary object with all the recording settings that this
//Recording sessoin will use
//Its not clear to me which of these are required and which are the bare minimum.
//This is a good resource: http://www.totodotnet.net/tag/avaudiorecorder/
NSMutableDictionary* recordSetting = [[NSMutableDictionary alloc] init];
[recordSetting setValue :[NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey];
[recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];
[recordSetting setValue:[NSNumber numberWithInt:2] forKey:AVNumberOfChannelsKey];
//Now that we have our settings we are going to instanciate an instance of our recorder instance.
//Generate a temp file for use by the recording.
//This sample was one I found online and seems to be a good choice for making a tmp file that
//will not overwrite an existing one.
NSString *fileName = [NSString stringWithFormat:@"%.0f.caf", [NSDate timeIntervalSinceReferenceDate] * 1000.0];
NSString *path = [NSTemporaryDirectory() stringByAppendingPathComponent:fileName];
recordedTmpFile = [NSURL fileURLWithPath:path];
NSLog(@"Using File called: %@",recordedTmpFile);
//Setup the recorder to use this file and record to it.
recorder = [[AVAudioRecorder alloc] initWithURL:recordedTmpFile settings:recordSetting error:&error];
//Use the recorder to start the recording.
//Im not sure why we set the delegate to self yet.
//Found this in antother example, but Im fuzzy on this still.
[recorder setDelegate:self];
//We call this to start the recording process and initialize
//the subsstems so that when we actually say "record" it starts right away.
[recorder prepareToRecord];
//Start the actual Recording
[recorder record];
//There is an optional method for doing the recording for a limited time see
//[recorder recordForDuration:(NSTimeInterval) 10]
} else {
toggle = YES;
[actSpinner stopAnimating];
[btnStart setImage:[UIImage imageNamed:@"recordrecord.png"] forState:UIControlStateNormal];
btnPlay.enabled = toggle;
btnPlay.hidden = !toggle;
[theTimer invalidate];
NSLog(@"Using File called: %@",recordedTmpFile);
//Stop the recorder.
[recorder stop];
}
}
- (IBAction)play_button_pressed{
//The play button was pressed...
//Setup the AVAudioPlayer to play the file that we just recorded.
AVAudioPlayer * avPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:recordedTmpFile error:&error];
[avPlayer prepareToPlay];
[avPlayer play];
}
- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
//Clean up the temp file.
NSFileManager * fm = [NSFileManager defaultManager];
[fm removeItemAtPath:[recordedTmpFile path] error:&error];
//Call the dealloc on the remaining objects.
[recorder dealloc];
recorder = nil;
recordedTmpFile = nil;
}
@end