Basic Sensors in iOS: Programming the Accelerometer, Gyroscope, and More

Recording) { recording = certain; [audioSession setCategory:AVAudioSessionCategoryRecord error:nil]; [audioSession setActive:YES error:nil]; [startStopButton setTitle:@"Stop Recording" forState:UIControlStateNormal]; NSMutableDictionary* recordSetting = [[NSMutableDictionary alloc] init]; [recordSetting setValue: [NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey]; [recordSetting setValue:[NSNumber numberWithFloat:44100. zero] forKey:AVSampleRateKey]; [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey]; tmpFile = [NSURL fileURLWithPath: [NSTemporaryDirectory() stringByAppendingPathComponent: [NSString stringWithFormat: @"%. 0f. %@", [NSDate timeIntervalSinceReferenceDate] * a thousand. zero, @"caf"]]]; recorder = [[AVAudioRecorder alloc] initWithURL:tmpFile settings:recordSetting error:nil]; [recorder setDelegate:self]; [recorder prepareToRecord]; [recorder record]; } else { recording = NO; [audioSession setActive:NO error:nil]; 34 | bankruptcy 3: Using Audio Figure 3-4. including the “Play Recording” button to the person interface [startStopButton setTitle:@"Start Recording" forState:UIControlStateNormal]; [recorder stop]; } } when you retailer your alterations and click the Run button to construct and install the appliance for your gadget you'll want to see the “Start Recording” button alterations to “Stop Recording” while pressed. urgent the button back may still swap the textual content again to “Start Recording”. within the subsequent part I’ll convey you the way to cost that the machine is absolutely recording audio. taking part in Audio Open up the RecorderViewController. h interface dossier and upload the next IBOutlet example variable: IBOutlet UIButton *playButton; in addition to the next IBAction approach: - (IBAction)playButtonPressed; Recording and enjoying Audio | 35 Figure 3-5. the completed Recorder program Then unmarried click the RecorderViewController. xib dossier to open it in Interface Builder. Drag and drop and new UIButton into the view and alter the identify textual content to be “Play Recording”. Use the Assistant Editor to attach the recent button to the lately additional IBOutlet and IBAction within the interface dossier, see determine 3-4. retailer your alterations, go back to the RecorderViewController. m implementation dossier and upload the subsequent procedure implementation: - (IBAction)playButtonPressed { AVAudioSession * audioSession = [AVAudioSession sharedInstance]; [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil]; [audioSession setActive:YES error:nil]; AVAudioPlayer * participant = [[AVAudioPlayer alloc] initWithContentsOfURL:tmpFile error:nil]; [player prepareToPlay]; [player play]; } store your alterations and click the Run button within the Xcode toolbar to construct and install the applying on your machine. you need to see whatever like determine 3-5. for those who now faucet at the “Start Recording” button the name of the button should still switch to “Stop Recording”; communicate into the iPhone’s microphone for few seconds and faucet the button back. Then faucet at the “Play Recording” button and also you should still pay attention your self talking.