在我的应用程序中，我使用GeoFire用户位置来查询用户。这是一个类似于 Tinder 的应用程序，带有卡片等……我KolodaView用于卡片。
查询功能：
func queryUsers(searchRadius: Int, center: CLLocation) {
print("Query started")
let geofireRef = Database.database().reference().child("usersLocations")
let geoFire = GeoFire(firebaseRef: geofireRef)
let circleQuery = geoFire?.query(at: center, withRadius: Double(searchRadius))
_ = circleQuery?.observe(.keyEntered, with: { (result, location) in
print("User \(result!) found")
print("Adding user \(result!)")
addUser(userID: result!, completionHandler: { (success) in
print("User added")
})
})
}
添加用户功能：
func addUser(userID: String, completionHandler:@escaping (Bool) -> ()) {
let foundUsers = UserDefaults.standard.array(forKey: "foundUsers")
let databaseRef = Database.database().reference()
databaseRef.observeSingleEvent(of: .value, with: { (snapshot) in
if (foundUsers?.count)! < 20 {
// USERS
let users = (snapshot.value as? NSDictionary)?["users"] as! NSDictionary
// USER
let user = users[userID] as! NSDictionary
getFirstUserPicture(userID: userID, completionHandler: { (data) in
if let data = data {
DispatchQueue.main.async {
user.setValue(data, forKey: "picture")
// APPEND FOUND USERS ARRAY
var foundUsers = UserDefaults.standard.array(forKey: "foundUsers")
foundUsers?.append(user)
// STORE FOUND USERS ARRAY
UserDefaults.standard.set(foundUsers, forKey: "foundUsers")
UserDefaults.standard.synchronize()
// UPDATE CARD VIEW
if foundUsers?.count == 1 {
NotificationCenter.default.post(name: .loadCardView, object: nil)
} else {
NotificationCenter.default.post(name: .loadCardsInArray, object: nil)
}
// COMPLETION
completionHandler(true)
}
}
})
}
}) { (error) in
print(error.localizedDescription)
}
}
当我启动应用程序时，该queryUsers函数被调用，查询开始
输出
User 1XXXXXXXXXXXXXXXX found
Adding user 1XXXXXXXXXXXXXXXX
User 2XXXXXXXXXXXXXXXX found
Adding user 2XXXXXXXXXXXXXXXX
User added
User added
- 找到用户
- 添加用户（调用
addUser函数）
问题是它没有等待addUser完成调用addUser找到的第二个用户。结果是在我KolodaView的 中，第二个用户被找到了两次，因为我认为对addUser找到的第二个用户的调用使用了第一个用户找到的参数。
是否可以等待第一次addUser完成并重新开始查询？或者只是在找到第一个用户后“暂停”查询，并在第一次addUser调用完成后再次启动它？
谢谢你的帮助
更新 1
我尝试了@Rlee128 解决方案，但没有任何改变，我有相同的输出:(:
// MARK: UPDATE USER LOCATION - FUNCTION
func updateUserLocation() {
let databaseRef = Database.database().reference().child("usersLocations")
let geoFire = GeoFire(firebaseRef: databaseRef)
let userID = UserDefaults.standard.string(forKey: "userID")!
let locationManager = CLLocationManager()
locationManager.delegate = self
locationManager.startUpdatingLocation()
geoFire?.setLocation(locationManager.location, forKey: userID, withCompletionBlock: { (error) in
if error != nil {
print(error as Any)
} else {
// Location updated
}
})
}
// MARK: LOCATION MANAGER DELEGATE - FUNCTION
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
manager.stopUpdatingLocation()
manager.delegate = nil
}