AVAudioRecorder is always null

本文关键字：null always is AVAudioRecorder | 更新日期: 2023-09-27 18:05:49

我一直试图在xamarin形式中记录音频，没有直接的方法来做到这一点，所以我试图通过自定义渲染来实现它，我从这里遵循了示例。

//AVAudioRecorder创建 

        //set up the NSObject Array of values that will be combined with the keys to make the NSDictionary
        NSObject[] values = new NSObject[]
        {
            NSNumber.FromFloat (16000.0f), //Sample Rate
            NSNumber.FromInt32 ((int)AudioToolbox.AudioFormatType.MPEG4AAC), //AVFormat
            NSNumber.FromInt32 (1), //Channels
            NSNumber.FromInt32 (16), //PCMBitDepth  
            NSNumber.FromBoolean (false), //IsBigEndianKey
            NSNumber.FromBoolean (false) //IsFloatKey
        };
        //Set up the NSObject Array of keys that will be combined with the values to make the NSDictionary
        NSObject[] keys = new NSObject[]
        {
            AVAudioSettings.AVSampleRateKey,
            AVAudioSettings.AVFormatIDKey,
            AVAudioSettings.AVNumberOfChannelsKey,
            AVAudioSettings.AVLinearPCMBitDepthKey,
            AVAudioSettings.AVLinearPCMIsBigEndianKey,
            AVAudioSettings.AVLinearPCMIsFloatKey
        };
        //Set Settings with the Values and Keys to create the NSDictionary
        settings = NSDictionary.FromObjectsAndKeys (values, keys);
        //Set recorder parameters
        recorder = AVAudioRecorder.Create(url, new AudioSettings(settings), out error);

然而在代码"recorder = AVAudioRecorder. "创建(url，新建AudioSettings(设置)，输出错误);总是null

AVAudioRecorder is always null

我已经自己修复了它，通过更改音频设置使其工作如下

    `var settings = new AudioSettings
        {
            SampleRate = 44100.0f,
            Format = AudioFormatType.LinearPCM,
            NumberChannels = 1,
            LinearPcmBitDepth = 16,
            AudioQuality = AVAudioQuality.High,
        };`
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