CombineFirebase

Example

To run the example project, clone the repo, and run pod install from the Example directory first.

Requirements

Xcode 11.3

Swift 5.1

Installation

CombineFirebase is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'CombineFirebase/Firestore'
pod 'CombineFirebase/RemoteConfig'
pod 'CombineFirebase/Database'
pod 'CombineFirebase/Storage'
pod 'CombineFirebase/Auth'
pod 'CombineFirebase/Functions'

Usage

import CombineFirebase
import Firebase
import Combine

Database
Firestore
RemoteConfig
Storage
Auth
Functions

Database

Basic write operation:

var cancelBag = Set<AnyCancellable>()

func setUserData() {
    let ref = Database.database().reference()

    ref.child("users")
        .child("1")
        .setValue(["username": "Arnonymous"])
        .sink { _ in
            print("Document successfully updated")
        }.store(in: &cancelBag)
}

    
// https://firebase.google.com/docs/database/ios/read-and-write#basic_write

Listen for value events:

var cancelBag = Set<AnyCancellable>()

func listenForValueEvent() {
    let ref = Database.database().reference()

    ref.child("users")
        .child("1")
        .publisher(.value)
        .receive(on: RunLoop.main)
        .sink { snapshot in
            print("Value:\(snapshot.value)")
        }.store(in: &cancelBag)
}
    
// https://firebase.google.com/docs/database/ios/read-and-write#listen_for_value_events

Read data once:

var cancelBag = Set<AnyCancellable>()

func readDataOnce() {
    let ref = Database.database().reference()

    ref.child("users")
        .child("1")
        .observeSingleEvent(.value)
        .receive(on: RunLoop.main)                
        .sink { snapshot in
            print("Value:\(snapshot.value)")
        }.store(in: &cancelBag)
}
    
// https://firebase.google.com/docs/database/ios/read-and-write#read_data_once

Update specific fields:

var cancelBag = Set<AnyCancellable>()

func updateFields() {
    let ref = Database.database().reference()

    let childUpdates = ["/posts/\(key)": post,
                        "/user-posts/\(userID)/\(key)/": post]
    ref.updateChildValues(childUpdates)
        .receive(on: RunLoop.main)
        .sink { _ in
            // Success
        }.store(in: &cancelBag)
}

// https://firebase.google.com/docs/database/ios/read-and-write#update_specific_fields

Delete data:

var cancelBag = Set<AnyCancellable>()

func deleteData() {
    let ref = Database.database().reference()

    ref.removeValue()
        .receive(on: RunLoop.main)    
        .sink { _ in
            // Success
        }.store(in: &cancelBag)
}
    
// https://firebase.google.com/docs/database/ios/read-and-write#delete_data

Save data as transactions

var cancelBag = Set<AnyCancellable>()

func saveDataAsTransaction() {
    let ref = Database.database().reference()

    ref.runTransactionBlock { currentData in
            // TransactionResult
        }.sink { _ in
            // Success
        }.store(in: &cancelBag)
}
    
// https://firebase.google.com/docs/database/ios/read-and-write#save_data_as_transactions

Firestore

Setting data:

var cancelBag = Set<Cancellable>()

let db = Firestore.firestore()

struct City: Codable {
    var name: String? = nil
    var state: String? = nil
    var country: String? = nil
    var capital: String? = nil
    var population: Int? = nil
    
    // local variable 
    var id: String? = nil
}

func setSanFranciscoData(city: City) {
    let onErrorCompletion: ((Subscribers.Completion<Error>) -> Void)? = { completion in
        switch completion {
        case .finished: print("🏁 finished")
        case .failure(let error): print("❗️ failure: \(error)")
        }
    }

    let onValue: (Void) -> Void = {
        print("✅ value")
    }

    // Add a new document in collection "cities"
    (db.collection("cities")
        .document("SF")
        .setData(from: city) as AnyPublisher<Void, Error>) // Note: you can use (as Void) for simple setData({})
            .sink(receiveCompletion: onErrorCompletion, receiveValue: onValue)
            .store(in: &cancelBag)
}
       
// Add a new document with a generated id.
func addSanFranciscoDocument(city: City) {
    (db.collection("cities")
        .addDocument(data: [
            "name": "San Francisco",
            "state": "CA",
            "country": "USA",
            "capital": false,
            "population": 860000
            ]) as AnyPublisher<DocumentReference, Error>)
            .sink(receiveCompletion: { completion in
            switch completion {
            case .finished: print("🏁 finished")
            case .failure(let error): print("❗️ failure: \(error)")
            }) { ref in
                print("Document added with ID: \(ref.documentID)")
            }
            .store(in: &cancelBag)            
}
        
// Set the "capital" field of the city 'SF'
func updateSanFranciscoDocument() {
    (db.collection("cities")
        .document("SF")
        .updateData([
            "capital": true
            ]) as AnyPublisher<Void, Error>)
            .sink(receiveCompletion: { completion in
            switch completion {
            case .finished: print("🏁 finished")
            case .failure(let error): print(i"❗️ failure: \(error)")
            }) { _ in }
            .store(in: &cancelBag)
}
        
// https://firebase.google.com/docs/firestore/manage-data/add-data

Get a document:

func getDocument() {
    db.collection("cities")
        .document("SF")
        .getDocument()
        .sink(receiveCompletion: { (completion) in
               switch completion {
               case .finished: print("🏁 finished")
               case .failure(let error): print("❗️ failure: \(error)")
               }
           }) { document in
               print("Document data: \(document.data())")
        }
        .store(in: &cancelBag)
}


func getDocumentAsObject() {
    db.collection("cities")
        .document("SF")
        .getDocument(as: City.self)
        .sink(receiveCompletion: { (completion) in
               switch completion {
               case .finished: print("🏁 finished")
               case .failure(let error): print("❗️ failure: \(error)")
               }
           }) { city in
               print("City: \(city)")
        }
        .store(in: &cancelBag)
}

    
// https://firebase.google.com/docs/firestore/query-data/get-data

Get Realtime Updates:

let db = Firestore.firestore()

// Document
func listenDocument() {
    db.collection("cities")
        .document("SF")
        .publisher()
        .sink(receiveCompletion: { completion in
            switch completion {
            case .finished: print("🏁 finished")
            case .failure(let error): print("❗️ failure: \(error)")
            }
        }) { document in
            print("Document data: \(document.data())")
        }
        .store(in: &cancelBag)
}

var cityDocumentSnapshotMapper: (DocumentSnapshot) throws -> City? {
    {
        var city =  try $0.data(as: City.self)
        city.id = $0.documentID
        return city
    }
}

func listenDocumentAsObject() {
    db.collection("cities")
        .document("SF")
        .publisher(as: City.self, documentSnapshotMapper: cityDocumentSnapshotMapper)
        .sink(receiveCompletion: { completion in
            switch completion {
            case .finished: print("🏁 finished")
            case .failure(let error): print("❗️ failure: \(error)")
            }
        }) { city in
            print("City: \(city)")
        }
        .store(in: &cancelBag)
}

    
// Collection
func listenCollection() {
    db.collection("cities")
        .publisher()
        .sink(receiveCompletion: { completion in
            switch completion {
            case .finished: print("🏁 finished")
            case .failure(let error): print("❗️ failure: \(error)")
            }
        }) { snapshot in
            print("collection data: \(snapshot.documents)")
        }.store(in: &cancelBag)
}

func listenCollectionAsObject() {
    db.collection("cities")
        .publisher(as: City.self, documentSnapshotMapper: cityDocumentSnapshotMapper)
        .sink(receiveCompletion: { completion in
            switch completion {
            case .finished: print("🏁 finished")
            case .failure(let error): print("❗️ failure: \(error)")
            }
        }) { cities in
            print("Cities: \(cities)")
        }.store(in: &cancelBag)
}

// https://firebase.google.com/docs/firestore/query-data/listen

Batched writes:

var cancelBag = Set<AnyCancellable>()

func batchWrite() {
    let db = Firestore.firestore()

    // Get new write batch
    let batch = db.batch()

    // Update the population of 'SF'
    let sfRef = db.collection("cities").document("SF")
    batch.updateData(["population": 1000000 ], forDocument: sfRef)

    // Commit the batch
    batch.commit()
        .sink(receiveCompletion: { completion in
            switch completion {
            case .finished: print("🏁 finished")
            case .failure(let error): print("❗️ failure: \(error)")
            }
        }) { _ in}
        .store(in: &cancelBag)
}
    
// https://firebase.google.com/docs/firestore/manage-data/transactions

Transactions:

var cancelBag = Set<AnyCancellable>()

func transaction() {
    let db = Firestore.firestore()
    let sfReference = db.collection("cities").document("SF")

    (db.runTransaction { transaction in
        let sfDocument = try transaction.getDocument(sfReference)
        
        guard let oldPopulation = sfDocument.data()?["population"] as? Int else {
            let error = NSError(
                domain: "AppErrorDomain",
                code: -1,
                userInfo: [
                    NSLocalizedDescriptionKey: "Unable to retrieve population from snapshot \(sfDocument)"
                ]
            )
            throw error
        }
        
        transaction.updateData(["population": oldPopulation + 1], forDocument: sfReference)
        return nil
        } as AnyPublisher<Any?, Error>)
        .sink(receiveCompletion: { completion in
            switch completion {
            case .finished: print("🏁 finished")
            case .failure(let error): print("❗️ failure: \(error)")
            }
        }) { _ in
            print("Transaction successfully committed!")
        }
        .store(in: &cancelBag)
}
    
    // https://firebase.google.com/docs/firestore/manage-data/transactions

RemoteConfig

Fetch:

// TimeInterval is set to expirationDuration here, indicating the next fetch request will use
// data fetched from the Remote Config service, rather than cached parameter values, if cached
// parameter values are more than expirationDuration seconds old. See Best Practices in the
// README for more information.

var cancelBag = Set<AnyCancellable>()

func fetchRemoteConfig() {
    (RemoteConfig.remoteConfig()
        .fetch(withExpirationDuration: TimeInterval(expirationDuration), activateFetched: true) as AnyPublisher<RemoteConfigFetchStatus, Error>)
        .sink(receiveCompletion: { completion in
            switch completion {
            case .finished: print("🏁 finished")
            case .failure(let error): print("❗️ failure: \(error)")
            }
        }) { status in
            print("Config fetched! with success:\(status == .success)")
        }
       .store(in: &cancelBag)
}

    // https://firebase.google.com/docs/remote-config/ios

Storage

Upload:

var cancelBag = Set<AnyCancellable>()

let reference = Storage.storage()
    .reference(forURL: "\(your_firebase_storage_bucket)/images/space.jpg")
    
let data: Data // Upload data
(reference.putData(data) as AnyPublisher<StorageMetadata, Error>)
    .sink(receiveCompletion: { completion in
         switch completion {
         case .finished: print("🏁 finished")
         case .failure(let error): // Uh-oh, an error occurred! 
         }
     }) { metadata in
        // Success         
     }
     .store(in: &cancelBag)
    

let fileURL: URL // Upload file
(reference.putFile(from: fileURL) as AnyPublisher<StorageMetadata, Error>)
    .sink(receiveCompletion: { completion in
        switch completion {
        case .finished: print("🏁 finished")
        case .failure(let error): // Uh-oh, an error occurred! 
        }
    }) { metadata in
       // Success         
    }
    .store(in: &cancelBag)

Observe events:

var cancelBag = Set<AnyCancellable>()
let reference = Storage.storage()
    .reference(forURL: "\(your_firebase_storage_bucket)/images/space.jpg")

let fileURL: URL // Upload file
let uploadTask = reference.putFile(from: fileURL)

// Listen for state changes
uploadTask.publisher(.progress)
    .sink(receiveCompletion: { _ in
       print("🏁 finished")
   }) { snapshot in
      if let error = snapshot.error {
         print("error: \(error)")
      }
      // Upload reported progress
      let percentComplete = 100.0 * Double(snapshot.progress?.completedUnitCount ?? 0)
      / Double(snapshot.progress.totalUnitCount ?? 1)
   }
   .store(in: &cancelBag)

Download:

var cancelBag = Set<AnyCancellable>()
let reference = Storage.storage()
    .reference(forURL: "\(your_firebase_storage_bucket)/images/space.jpg")

// Download in memory with a maximum allowed size of 1MB (1 * 1024 * 1024 bytes)
(reference.getData(maxSize: 1 * 1024 * 1024) as AnyPublisher<Data, Error>)
    .sink(receiveCompletion: { completion in
        switch completion {
        case .finished: print("🏁 finished")
        case .failure(let error): // Uh-oh, an error occurred! 
        }
    }) { data in
       // Data for "images/space.jpg" is returned
    }
    .store(in: &cancelBag)
    
    
// Create local filesystem URL
let localURL = URL(string: "path/to/image")!
    
// Download to the local filesystem
(reference.write(toFile: localURL) as AnyPublisher<URL, Error>)
    .sink(receiveCompletion: { completion in
        switch completion {
        case .finished: print("🏁 finished")
        case .failure(let error): // Uh-oh, an error occurred! 
        }
    }) { data in
       // Local file URL for "images/space.jpg" is returned
    }
    .store(in: &cancelBag)

URL:

var cancelBag = Set<AnyCancellable>()
let reference = Storage.storage()
    .reference(forURL: "\(your_firebase_storage_bucket)/images/space.jpg")
    
// Fetch the download URL
(reference.downloadURL() as AnyPublisher<URL, Error>)
    .sink(receiveCompletion: { completion in
        switch completion {
        case .finished: print("🏁 finished")
        case .failure(let error): // Uh-oh, an error occurred! 
        }
    }) { data in
        // Get the download URL for 'images/space.jpg'       
    }
    .store(in: &cancelBag)

Metadata:

var cancelBag = Set<AnyCancellable>()
let reference = Storage.storage()
    .reference(forURL: "\(your_firebase_storage_bucket)/images/space.jpg")
    
// Create file metadata to update
let newMetadata = StorageMetadata()
    
// Update metadata properties
(reference.updateMetadata(newMetadata) as AnyPublisher<StorageMetadata, Error>)
    .sink(receiveCompletion: { completion in
        switch completion {
        case .finished: print("🏁 finished")
        case .failure(let error): // Uh-oh, an error occurred! 
        }
    }) { metadata in
        // Updated metadata for 'images/space.jpg' is returned        
    }
    .store(in: &cancelBag)
    
// Get metadata properties
(reference.getMetadata() as AnyPublisher<StorageMetadata, Error>)
    .sink(receiveCompletion: { completion in
        switch completion {
        case .finished: print("🏁 finished")
        case .failure(let error): // Uh-oh, an error occurred! 
        }
    }) { metadata in
        // Metadata now contains the metadata for 'images/space.jpg'
    }
    .store(in: &cancelBag)

Delete:

var cancelBag = Set<AnyCancellable>()
let reference = Storage.storage()
    .reference(forURL: "\(your_firebase_storage_bucket)/images/space.jpg")
    
// Delete the file
(reference.delete() as AnyPublisher<Void, Error>)
    .sink(receiveCompletion: { completion in
        switch completion {
        case .finished: print("🏁 finished")
        case .failure(let error): // Uh-oh, an error occurred! 
        }
    }) { _ in
        // File deleted successfully    
    }
    .store(in: &cancelBag)

Auth

Create:

var cancelBag = Set<AnyCancellable>()
let auth = Auth.auth()
    
// Create a password-based account
(auth.createUser(withEmail: "[email protected]", password: "1q2w3e4r") as AnyPublisher<AuthDataResult, Error>)
    .sink(receiveCompletion: { completion in
        switch completion {
        case .finished: print("🏁 finished")
        case .failure(let error): // Uh-oh, an error occurred! 
        }
    }) { _ in
        // User signed in
    }.store(in: &cancelBag)

// https://firebase.google.com/docs/auth/ios/password-auth

var cancelBag = Set<AnyCancellable>()

let auth = Auth.auth()
    
// Sign in a user with an email address and password
(auth.signIn(withEmail: "[email protected]", password: "1q2w3e4r") as AnyPublisher<AuthDataResult, Error>)
    .sink(receiveCompletion: { completion in
        switch completion {
        case .finished: print("🏁 finished")
        case .failure(let error): // Uh-oh, an error occurred! 
        }
    }) { _ in
        // User signed in
    }.store(in: &cancelBag)

// https://firebase.google.com/docs/auth/ios/password-auth

User

Update Email:

var cancelBag = Set<AnyCancellable>()
let user = Auth.auth().currentUser
    
// Set a user's email address
(user.updateEmail(to: "[email protected]") as AnyPublisher<Void, Error>)
    .sink(receiveCompletion: { completion in
        switch completion {
        case .finished: print("🏁 finished")
        case .failure(let error): // Uh-oh, an error occurred! 
        }
    }) { _ in
        // Completed updating Email         
    }.store(in: &cancelBag)

// https://firebase.google.com/docs/auth/ios/manage-users

Delete:

var cancelBag = Set<AnyCancellable>()
let user = Auth.auth().currentUser

// Delete a user
(user.delete() as AnyPublisher<Void, Error>)
    .sink(receiveCompletion: { completion in
        switch completion {
        case .finished: print("🏁 finished")
        case .failure(let error): // Uh-oh, an error occurred! 
        }
    }) { _ in
        // User deleted
    }.store(in: &cancelBag)

// https://firebase.google.com/docs/auth/ios/manage-users

Functions

var cancelBag = Set<AnyCancellable>()
let functions = Functions.functions()
let request = functions.httpsCallable("functionName")

(request
    .call(["parameter": "value"]) as AnyPublisher<HTTPSCallableResult, Error>)
    .sink(receiveCompletion: { completion in
        switch completion {
        case .finished: print("🏁 finished")
        case .failure(let error): print("error:\(error)")
        }
    }) { result in
         print("response:\(result)")
    }.store(in: &cancelBag)
    
    // https://firebase.google.com/docs/functions/callable#call_the_function

Author

Kumar Shivang, [email protected]

License

CombineFirebase is available under the MIT license. See the LICENSE file for more info.

CombineFirebase 0.2.6

CombineFirebase 0.2.6

CombineFirebase 0.2.6

CombineFirebase

Example

Requirements

Installation

Usage

Database

Firestore

RemoteConfig

Storage

Auth

User

Functions

Author

License