将数据从Firebase附加到阵列 [英] Appending data from Firebase to array

问题描述

我有一些要在tableView中显示的数组:

I have these arrays that I want to display in a tableView:

private var firOrder = [String]()
private var firDate = [Int]() 

我尝试获取并追加数据，如下所示:

I try to get and append the data like this:

override func viewDidLoad() {
    ref = Database.database().reference() ref?.child("users").child(user).child("Orders").observe(.value, with: { (snapshot) in
        let values = snapshot.value as? [String: AnyObject]
        let order = values!["Order"] as! String
        let date = values!["Date"] as! Int
        print("order \(order)") //This prints correctly
        print("date \(date)")  //This prints correctly

        self.firOrder.append(order)   
        self.firDate.append(date)
    })

    print(firOrder) //This prints empty and does not append to array.   
    print(firDate) //This prints empty and does not append to array
}

推荐答案

由于该调用是异步的，因此需要在数据返回的回调内重新加载表

Because the call is asynchronous , you need to reload the table inside the callback where the data returns

self.firOrder.append(order)   
self.firDate.append(date)
self.tableView.reloadData()

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