SBStatusBarController实例

Question

有人可以用小样本帮我如何获取SBStatusBarController实例吗？我看了很多论坛和源代码,它对我不起作用:(

谢谢.

Answer 1

好的,我已经找到了如何在没有SpringBoard和使用合法手段的情况下显示像In-Call状态栏这样的双高状态栏的方法.这是一个解决方案.当应用程序处于baground模式时,有两种方法可以显示具有应用程序名称的双重状态栏:使用套接字连接到VoIP服务或模拟录音.使用第一种方式,您将看到绿色发光状态栏,如果您喜欢红色,则必须使用第二种方式.好的,我使用第二种方法并执行录音模拟.要实现此目的,只需将以下字符串添加到应用程序的PLIST配置文件:

<key>UIBackgroundModes</key>
<array>
    <string>voip</string>
    <string>audio</string>
</array>

它将告诉iOS您的应用程序将在后台使用音频和VoIP.现在代码.我们将模拟从麦克风到NULL设备的录音:

- (void) startRecording
{

    AVAudioSession *audioSession = [AVAudioSession sharedInstance];
    NSError *err = nil;
    [audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err];
    if(err){
        NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
        return;
    }
    [audioSession setActive:YES error:&err];
    err = nil;
    if(err){
        NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
        return;
    }


    recordSetting = [[NSMutableDictionary alloc] init];

    [recordSetting setValue :[NSNumber numberWithInt:kAudioFormatLinearPCM] forKey:AVFormatIDKey];
    [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey]; 
    [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];

    [recordSetting setValue :[NSNumber numberWithInt:16] forKey:AVLinearPCMBitDepthKey];
    [recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsBigEndianKey];
    [recordSetting setValue :[NSNumber numberWithBool:NO] forKey:AVLinearPCMIsFloatKey];


    NSURL *url = [NSURL fileURLWithPath:@"/dev/null"];    
    err = nil;
    recorder = [[ AVAudioRecorder alloc] initWithURL:url settings:recordSetting error:&err];
    if(!recorder){
        NSLog(@"recorder: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
        UIAlertView *alert =
        [[UIAlertView alloc] initWithTitle: @"Warning"
                                   message: [err localizedDescription]
                                  delegate: nil
                         cancelButtonTitle:@"OK"
                         otherButtonTitles:nil];
        [alert show];
        [alert release];
        return;
    }

    //prepare to record
    [recorder setDelegate:self];
    [recorder prepareToRecord];
    recorder.meteringEnabled = YES;

    BOOL audioHWAvailable = audioSession.inputIsAvailable;
    if (! audioHWAvailable) {
        UIAlertView *cantRecordAlert =
        [[UIAlertView alloc] initWithTitle: @"Warning"
                                   message: @"Audio input hardware not available"
                                  delegate: nil
                         cancelButtonTitle:@"OK"
                         otherButtonTitles:nil];
        [cantRecordAlert show];
        [cantRecordAlert release]; 
        return;
    }

    // start recording
    [recorder record];//recordForDuration:(NSTimeInterval) 40];

}

将此方法添加到应用程序委托,并从didFinishLaunchingWithOptions调用它.另外,据我所知,您可以将音频会话类别设置为AVAudioSessionCategoryPlayAndRecord并使其处于活动状态.如果将此代码添加到项目中,那么如果您将应用程序置于后台,您将看到包含应用程序名称的双高状态栏.

我认为就是这样.

谢谢.