iOS 麦克风访问权限

 - (BOOL)canRecord
 {
     __block BOOL bCanRecord = YES;
     if ([[[UIDevice currentDevice] systemVersion] compare:@"7.0"] != NSOrderedAscending)
     {
         AVAudioSession *audioSession = [AVAudioSession sharedInstance];
         if ([audioSession respondsToSelector:@selector(requestRecordPermission:)]) {
             [audioSession performSelector:@selector(requestRecordPermission:) withObject:^(BOOL granted) {
                 if (granted) {
                     bCanRecord = YES;
                 } else {
                     bCanRecord = NO;
                 }
             }];
         }
     }

     return bCanRecord;
 }

 #pragma mark - Audio Recorder √

 /*开始录音*/
 - (void)startToRecord:(id)sender
 {
     if (![self canRecord]) {
         [[[UIAlertView alloc] initWithTitle:nil
                                     message:[NSString stringWithFormat:@"%@需要访问您的麦克风。\n请启用麦克风-设置/隐私/麦克风", [TIXAAppMonitor sharedMonitor].appName]
                                    delegate:nil
                           cancelButtonTitle:@"好"
                           otherButtonTitles:nil] show];
         return;
     }
 }