自定义Firebase数据服务类:Swift 3 [英] Custom Firebase Data Service Class : Swift 3
问题描述
我正在考虑一个API类(如本教程中所述),当我检索数据并完成从firebase的检索时,我将其保存在数据中设置在这个API类。然后我会通知通知中心。但我不确定这是最好的做法还是一个很好的方法来做到这一点。
有没有人知道如何做到这一点(完成本教程我发现或以另一种方式)?
在此先感谢!
开始使用这个解决方案,并打磨了一下,我来到了一个非常方便的解决方案。
我创建了一个名为FirebaseAPI的自定义类。这是一个单身人士课程。这个类包含Firebase的所有方法(认证,数据库,存储,...)。
$ b
例子:
< FirebaseAPI.swift
导入FirebaseAuth
导入FirebaseDatabase
class FirebaseAPI {
static let shared = FirebaseAPI()
private init(){}
//认证
func logInUser(onCompletion:如果错误== nil {
onCompletion(user!),那么
中的{(user,error) .uid)
} else {
onCompletion(nil)
}
})
}
//数据库
func getObjects(参数:ParamaterClass,onCompletion:@escaping([ObjectClass]) - > Void){
Constants.Firebase.References.Object?.observe(.value,with:{snapshot in
var objects = [ObjectClass]()
如果snapshot.exists(){
为snapshot.children.allObjects中的子元素{
let object = Object(snapshot:child as! FIRDataSnapshot)
objects.append(object)
}
}
onCompletion(objects)
})
}
}
Constants.swift
导入FirebaseDatabase
结构常量{
结构Firebase {
static var CurrentUser:FIRDatabaseReference?
static var对象:FIRDatabaseReference?
}
}
AppDelegate.swift
导入UIKit
导入Firebase
@UIApplicationMain $ b $ class AppDelegate:UIResponder, UIApplicationDelegate {
var window:UIWindow?
func application(_ application:UIApplication,didFinishLaunchingWithOptions launchOptions:[UIApplicationLaunchOptionsKey:Any]?) - > Bool {
FIRApp.configure()
FirebaseAPI.shared.logInUser(onCompletion {uid in
if uid!= nil {
Constants.Firebase.References.CurrentUser = FIRDatabase.database()。reference()。child(users)。child(uid!)
Constants.Firebase.References.CurrentUser.keepSynced(true)
Constants.Firebase .References.Objects = FIRDatabase.database()。reference()。child(objects)
Constants.Firebase.Reference.Objects?.keepSynced(true)
}
})
}
return true
}
我可以举个例子在ViewController的FirebaseAPI中调用方法,但在这里的AppDelegate.swift的代码(FirebaseAPI.shared.logInUser方法)中给出了一个这样的方法的示例。
到目前为止,在3个不同的项目中使用了这个结构,它可以很流畅地运行!
I'm searching for a clean way to retrieve (and sometimes save) data from Firebase in Swift. It's annoying me that all my database calls are written in the middle of the view controller code. So I'm looking for some kind of custom data service class. I found this tutorial that's close to what I want: http://www.mobilecyberpunks.com/?p=82.
They promised a Part II but I cannot find this second part, so I guess this was never made. In this second part they promised to cover retrieving and saving data with this custom data service (which is the most important part of the whole thing for me).
I'm thinking of an API class (like in the tutorial) and when I'm retrieving data, and it finishes retrieving from firebase, I save it in a data set in this api class. Then I will posting a notification with Notification Center. But I'm am not sure whether this is best practice or a good way to do this.
Has anyone an idea how to do this (finishing this tutorial I found or in another way)?
Thanks in advance!
I started to use this solution and polished it a little bit, and I came to a pretty handy solution.
I created a custom class named FirebaseAPI. This is a singleton class. This class contains all the methods for Firebase (Authentication, Database, Storage, ...).
Example:
FirebaseAPI.swift
import FirebaseAuth
import FirebaseDatabase
class FirebaseAPI {
static let shared = FirebaseAPI()
private init() {}
//Authentication
func logInUser(onCompletion: @escaping (String?) -> Void {
FIRAuth.auth().signInAnonymously(completion: {(user, error) in
if error == nil {
onCompletion(user!.uid)
} else {
onCompletion(nil)
}
})
}
//Database
func getObjects(parameter: ParamaterClass, onCompletion: @escaping ([ObjectClass]) -> Void) {
Constants.Firebase.References.Object?.observe(.value, with: { snapshot in
var objects = [ObjectClass]()
if snapshot.exists() {
for child in snapshot.children.allObjects {
let object = Object(snapshot: child as! FIRDataSnapshot)
objects.append(object)
}
}
onCompletion(objects)
})
}
}
Constants.swift
import FirebaseDatabase
struct Constants {
struct Firebase {
static var CurrentUser: FIRDatabaseReference?
static var Objects: FIRDatabaseReference?
}
}
AppDelegate.swift
import UIKit
import Firebase
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
FIRApp.configure()
FirebaseAPI.shared.logInUser(onCompletion { uid in
if uid != nil {
Constants.Firebase.References.CurrentUser = FIRDatabase.database().reference().child("users").child(uid!)
Constants.Firebase.References.CurrentUser.keepSynced(true)
Constants.Firebase.References.Objects = FIRDatabase.database().reference().child("objects")
Constants.Firebase.Reference.Objects?.keepSynced(true)
}
})
}
return true
}
I can give you a example of calling methods in the FirebaseAPI in a ViewController, but an example of such a method is given in the code of the AppDelegate.swift up here (the FirebaseAPI.shared.logInUser method).
Used this structure in 3 different projects up till now and it works fluently!
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