ios - 将 AVAudioRecorderDelegate 分配给非 UIViewController

Question

我正在创建一个 iOS 应用程序，它在出现提示时而不是在按下按钮时开始录制音频。因此，我将 AVAudioRecorder 放在一个从它自己的类调用的调度程序对象中。但是，当我将 调度程序指定为记录器的委托(delegate) 时，我收到警告 Assigning to 'id<AVAudioRecorderDelegate>' from incompatible type 'LWPScheduler *__strong' .这是调度程序的实现:

@implementation LWPScheduler
@synthesize tempo;
@synthesize userName;

+(LWPScheduler *)masterScheduler{
    static LWPScheduler *masterScheduler = nil;
    if (masterScheduler == nil)
    {
        masterScheduler = [[self alloc] init];
    }
    return masterScheduler;
}

- (id)init
{
    self = [super init];
    if (self) {
        self.tempo = 120;
        self.userName = @"Tim Burland";

        //recording init
        // Set the audio file
        NSArray *pathComponents = [NSArray arrayWithObjects:
                                   [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject],
                                   @"MyAudioMemo.m4a",
                                   nil];
        NSURL *outputFileURL = [NSURL fileURLWithPathComponents:pathComponents];

        //audio session
        AVAudioSession *session = [AVAudioSession sharedInstance];
        [session setCategory:AVAudioSessionCategoryPlayAndRecord error:nil];

        //recorder settings
        NSMutableDictionary *recordSetting = [[NSMutableDictionary alloc] init];

        [recordSetting setValue:[NSNumber numberWithInt:kAudioFormatMPEG4AAC] forKey:AVFormatIDKey];
        [recordSetting setValue:[NSNumber numberWithFloat:44100.0] forKey:AVSampleRateKey];
        [recordSetting setValue:[NSNumber numberWithInt: 2] forKey:AVNumberOfChannelsKey];

        // Initiate and prepare the recorder
        _recorder = [[AVAudioRecorder alloc] initWithURL:outputFileURL settings:recordSetting error:NULL];
        _recorder.delegate = self; //Incompatible Type Warning Here
        _recorder.meteringEnabled = YES;
        [_recorder prepareToRecord];
    }
    return self;
}

@end

我的问题是我是否必须将音频处理迁移到 Controller 以用于包含录音机的 View 。感谢您的帮助!

Answer 1

在您的接口(interface)(或私有(private)类扩展)上告诉编译器您符合委托(delegate)期望的协议(protocol)。例如:

@interface LWPScheduler : NSObject <AVAudioRecorderDelegate>
// ...
@end

该协议(protocol)定义了您可能必须实现的必需和/或可选方法(Xcode 会警告您需要的方法)。在告诉接口(interface)类确认协议(protocol)后，_recorder.delegate = self; 将正常工作。