iOS麦克风权限

AVAudioSession *avSession = [AVAudioSession sharedInstance];
    
    if ([avSession respondsToSelector:@selector(requestRecordPermission:)]) {
        
        [avSession requestRecordPermission:^(BOOL available) {
            
            if (available) {
                //completionHandler
            }
            else
            {
                dispatch_async(dispatch_get_main_queue(), ^{
                    [[[UIAlertView alloc] initWithTitle:@"无法录音" message:@"请在“设置-隐私-麦克风”选项中允许xx访问你的麦克风" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil] show];
                });
            }
        }];
        
    }