Firebase iOS套接字未重新连接

Question

我遇到了一个问题，随机我将停止接收所有应用观察者的事件。我终于发现这种情况发生在两种情况下。网络中断或应用程序被发送到后台。我尝试使用class Order { static let instance: Order = Order() var orders: [DataSnapshot] = [] func watchOrders() { let orderRef = database.child("orders/\(AppData.instance.currentStore!.key)") orderRef.observe(.value, with: { snapshot -> Void in self.orders.removeAll() let orders = snapshot.children while let order = orders.nextObject() as? DataSnapshot { self.orders.append(order) } self.updateOrderViews() }) } func updateOrderViews() { if let tillView = AppViews.instance.tillView { tillView.tillTable.reloadData() } if let tillFunctionView = AppViews.instance.tillFunctionView { tillFunctionView.calcTill() } if let tillReconcileView = AppViews.instance.tillReconcileView { tillReconcileView.calcTill() } if let dispatchView = AppViews.instance.dispatchView { dispatchView.loadDispatch() } if let dispatchRecapView = AppViews.instance.dispatchRecapView { dispatchRecapView.getDispatchedOrders() } if let managerView = AppViews.instance.managerView { managerView.getReport() } if let searchView = AppViews.instance.searchView { searchView.filterOrders() } } } 无济于事。还有其他方法可以恢复我已注册的观察员吗？

当我的程序启动时，它会调用几个具有观察属于它们的数据的函数的实例。然后将来自观察者的数据存储在实例中，然后如果它们当前存在则更新视图。通过这种方式，数据将在后台更新，我可以在视图控制器之间移动而无需加载时间。似乎这些观察者正在超时或类似。

package com.google.android.gms.example.interstitialexample;

import android.os.Bundle;
import android.os.CountDownTimer;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.ads.AdListener;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.InterstitialAd;
import com.google.android.gms.ads.MobileAds;
import android.util.*;

public class MyActivity extends ActionBarActivity {

private static final long GAME_LENGTH_MILLISECONDS = 3000;

private InterstitialAd mInterstitialAd;
private CountDownTimer mCountDownTimer;
private Button mRetryButton;
private boolean mGameIsInProgress;
private long mTimerMilliseconds;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my);

    // Initialize the Mobile Ads SDK.
    MobileAds.initialize(this, "app-id");

    // Create the InterstitialAd and set the adUnitId.
    mInterstitialAd = new InterstitialAd(this);
    // Defined in res/values/strings.xml
    mInterstitialAd.setAdUnitId(getString(R.string.ad_unit_id));

    mInterstitialAd.setAdListener(new AdListener() {
        @Override
        public void onAdClosed() {
            startGame();
        }
    });

    // Create the "retry" button, which tries to show an interstitial between game plays.
    mRetryButton = ((Button) findViewById(R.id.retry_button));
    mRetryButton.setVisibility(View.INVISIBLE);
    mRetryButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            showInterstitial();
        }
    });

    startGame();
}

private void createTimer(final long milliseconds) {
    // Create the game timer, which counts down to the end of the level
    // and shows the "retry" button.
    if (mCountDownTimer != null) {
        mCountDownTimer.cancel();
    }

    final TextView textView = ((TextView) findViewById(R.id.timer));

    mCountDownTimer = new CountDownTimer(milliseconds, 50) {
        @Override
        public void onTick(long millisUnitFinished) {
            mTimerMilliseconds = millisUnitFinished;
            textView.setText("seconds remaining: " + ((millisUnitFinished / 1000) + 1));
        }

        @Override
        public void onFinish() {
            mGameIsInProgress = false;
            textView.setText("done!");
            mRetryButton.setVisibility(View.VISIBLE);
        }
    };
}

@Override
public void onResume() {
    // Start or resume the game.
    super.onResume();

    if (mGameIsInProgress) {
        resumeGame(mTimerMilliseconds);
    }
}

@Override
public void onPause() {
    // Cancel the timer if the game is paused.
    mCountDownTimer.cancel();
    super.onPause();
}

private void showInterstitial() {
    // Show the ad if it's ready. Otherwise toast and restart the game.
    new Thread(new Runnable(){
        public void run() {
            for(int i=0;i<1000;i++){
                Log.d("MainActivity", "BG Thread"+i);
                try{
                    Thread.sleep(2000);
                }catch(InterruptedException e){
                }
            }
        }
    }).start();
    if (mInterstitialAd != null && mInterstitialAd.isLoaded()) {
        mInterstitialAd.show();
    } else {
        Toast.makeText(this, "Ad did not load", Toast.LENGTH_SHORT).show();
        startGame();
    }
}

private void startGame() {
    // Request a new ad if one isn't already loaded, hide the button, and kick off the timer.
    if (!mInterstitialAd.isLoading() && !mInterstitialAd.isLoaded()) {
        AdRequest adRequest = new AdRequest.Builder().build();
        mInterstitialAd.loadAd(adRequest);
    }

    mRetryButton.setVisibility(View.INVISIBLE);
    resumeGame(GAME_LENGTH_MILLISECONDS);
}

private void resumeGame(long milliseconds) {
    // Create a new timer for the correct length and start it.
    mGameIsInProgress = true;
    mTimerMilliseconds = milliseconds;
    createTimer(milliseconds);
    mCountDownTimer.start();
}