ios 录音权限的判断和处理

- (BOOL)checkMicrophonePermission{
    
    //    AVAudioSessionRecordPermission permission = [[AVAudioSession sharedInstance] recordPermission];
    //    return permission == AVAudioSessionRecordPermissionGranted;
    __block BOOL bCanRecord = NO;
    if ([[[UIDevice currentDevice]systemVersion]floatValue] >= 7.0) {
        AVAuthorizationStatus videoAuthStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeAudio];
        if (videoAuthStatus == AVAuthorizationStatusNotDetermined) {// 未询问用户是否授权
            AVAudioSession *audioSession = [AVAudioSession sharedInstance];
            if ([audioSession respondsToSelector:@selector(requestRecordPermission:)]) {
                [audioSession performSelector:@selector(requestRecordPermission:) withObject:^(BOOL granted) {
                    if (granted) {//用户选择允许
                        bCanRecord = YES;
                        NSLog(@"用户选择“允许”打开麦克风权限");
                        dispatch_async(dispatch_get_main_queue(), ^{
                            [self startRecordAudioSetup];
                        });
                        if (self.delegate && [self.delegate respondsToSelector:@selector(clickAllowOpenMicrophoneAuthorization)]) {
                            [self.delegate clickAllowOpenMicrophoneAuthorization];
                        }
                        
                    } else {//用户选择不允许
                        bCanRecord = NO;
                        NSLog(@" 用户选择“不允许”打开麦克风权限");
                        [self popUpMicrophonePermissionAlertView];//弹出自己自定义的窗
                        
                        if (self.delegate && [self.delegate respondsToSelector:@selector(clickNotAllowOpenMicrophoneAuthorization)]) {
                            [self.delegate clickNotAllowOpenMicrophoneAuthorization];
                        }
                    }
                }];
            }
        } else if(videoAuthStatus == AVAuthorizationStatusRestricted || videoAuthStatus == AVAuthorizationStatusDenied) {
            bCanRecord = NO;//用户在第一次系统弹窗后选择不允许之后，再次录音的时候会走这里“麦克风权限未授权”
            // 未授权
            NSLog(@"未授权");
            [self popUpMicrophonePermissionAlertView];//弹出自己自定义的窗
            
            if (self.delegate && [self.delegate respondsToSelector:@selector(microphoneUnauthorized)]) {
                [self.delegate microphoneUnauthorized];
            }
        } else{
            bCanRecord = YES;
            // 已授权
            NSLog(@"已授权");
            [self startRecordAudioSetup];
            
            if (self.delegate && [self.delegate respondsToSelector:@selector(microphoneAuthorized)]) {
                [self.delegate microphoneAuthorized];
            }
            
        }
    }
    return bCanRecord;
}

//弹出自定义开启麦克风权限的提示框
- (void)popUpMicrophonePermissionAlertView{
    
    dispatch_async(dispatch_get_main_queue(), ^{
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"麦克风权限未开启"message:@"麦克风权限未开启,请进入系统【设置】>【隐私】>【麦克风】中打开开关,开启麦克风功能" preferredStyle:UIAlertControllerStyleAlert];
    
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil];
    UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"确定");
        //跳入当前App设置界面
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
    }];
    
    [alertController addAction:cancelAction];
    [alertController addAction:okAction];
    
    [self  presentViewController:alertController animated:YES completion:nil];
    });
}