我正在编写将Firebase中的元素附加到数组以使用文本字段执行简单搜索的代码。

该方法的代码如下：

 var filteredEvents = [Event]()
var eventsArray = [Event]()
fileprivate func fetchEvents(){
    print("Fetching events....")
    //create a reference to the location in the database that you want to pull from and observe the value there
    let ref = Database.database().reference().child("events")
    // this will retur a snapshot with all the data at that location in the database and cast the results as a dictionary for later use
    ref.observe(.value, with: { (snapshot) in
        guard let dictionaries = snapshot.value as? [String: Any] else{
            return
        }
        //does the job of sorting dictionary elements by key and value
        //displaying the key and each corresponding value
        dictionaries.forEach({ (key,value) in
           // print(key, value)
            //creating an eventDictionary to store the results of previous call
            guard let eventDictionary = value as? [String: Any] else{
                return
            }
            //will cast each of the values as an Event based off my included struct
            //Make sure to create a model it is the only way to have the data in the format you want for easy access
             let events = Event(currentEventKey: key, dictionary:eventDictionary)
            // appends that to the dictionary to create the dictionary of events
            self.eventsArray.append(events)
        })
        // will sort the array elements based off the name
        self.eventsArray.sort(by: { (event1, event2) -> Bool in
            return event1.currentEventName.compare(event2.currentEventName) == .orderedAscending
        })
        // will again reload the data
        self.collectionView?.reloadData()

    }) { (err) in
        print("Failed to fetch events for search")
    }
}

我个人没有想到有可能发生很多事件的机会。我将无法将所有1000多个事件附加到字典中。那会刺痛我的记忆。无论如何，我可以让查询响应文本字段。也有人可以帮助我完成执行该操作但不会破坏我的记忆的查询行吗？

"events" : {
"CCDS" : {
  "attend:count" : 1,
  "event:date" : {
    "end:date" : "08/09/2017",
    "end:time" : "7:00 PM",
    "start:date" : "08/09/2017",
    "start:time" : "5:00 PM"
  },
  "event:description" : "Happy hour is more joyful in the summer thanks to Center City District Sips, which offers discounted drinks and appetizers every Wednesday evening.  Catch up with old friends and make a few new ones as Center City’s best bars and restaurants host the summer’s happiest hour every Wednesday from 5-7 p.m.  Enjoy $5 cocktails, $4 wine, $3 beers and half-price appetizers at dozens and dozens of bars and restaurants.",
  "event:imageURL" :someURL",
  "event:location" : {
    "event:city" : "Philadelphia",
    "event:state" : "PA",
    "event:street:address" : "660 Chestnut St",
    "event:zip" : 19106
  },
  "event:name" : "Center City District Sips"
},
"MIA" : {
  "attend:count" : 1,
  "event:date" : {
    "end:date" : "09/03/2017",
    "end:time" : "7:00 PM",
    "start:date" : "09/02/2017",
    "start:time" : "12:00 PM"
  },
  "event:description" : "Budweiser Made in America Festival is an annual music festival held in Philadelphia and formerly simultaneously held in Los Angeles.Sponsored by Anheuser–Busch and produced by Live Nation, the event features several stages that continuously host live music from a wide range of genres including hip hop, rock, pop, R&B, and EDM.",
  "event:imageURL" : "someURL",
  "event:location" : {
    "event:city" : "Philadelphia",
    "event:state" : "PA",
    "event:street:address" : "Ben Franklin Parkway",
    "event:zip" : 19130
  },
  "event:name" : "Made In America"
}
  },

例如，我想提取有关使用查询搜索的事件的所有信息。因此，如果我开始输入“美国制造”，它将从“事件”标签中提取有关该事件的所有相关信息

这是我目前拥有的

fileprivate func fetchEvents(searchString: String){
    print("Fetching events....")
    //create a reference to the location in the database that you want to pull from and observe the value there
    let ref = Database.database().reference().child("events")
    // this will retur a snapshot with all the data at that location in the database and cast the results as a dictionary for later use
  let query = ref.queryOrdered(byChild: "event:name").queryEqual(toValue: searchString)
    print(query)
    query.observeSingleEvent(of: .value, with: { (snapshot) in
        guard let dictionary = snapshot.value as? [String: Any] else{
            print(snapshot.value)
            return
        }
        print(snapshot.value)
    }) { (err) in
        print("Failed to fetch event data", err)
    }

}

返回此

(/events { ep = Made In America; i = "event:name"; sp = Made In America; })