mirror of
https://github.com/firebase/firebase-ios-sdk
synced 2026-11-10 22:45:59 +05:45
Paul Beusterien
f08b5044d6
Add Community Supported tvOS for Core, Auth, Database and Storage. Add tvOS unit tests Add tvOS sample app Update README.md Add tvOS to travis testing
84 lines
2.6 KiB
Swift
84 lines
2.6 KiB
Swift
// Copyright 2017 Google
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import UIKit
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import FirebaseDatabase
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/// A class to demonstrate the Firebase Realtime Database API. This will show a number read
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/// from the Database and increase or decrease it based on the buttons pressed.
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class DatabaseViewController: UIViewController {
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private enum Counter: Int {
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case increment = 1
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case decrement = -1
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var intValue: Int {
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return rawValue
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}
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}
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// MARK: - Interface
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/// Label to display the current value.
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@IBOutlet weak var currentValue: UILabel!
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// MARK: - User Actions
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/// The increment button was hit.
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@IBAction func incrementButtonHit(_ sender: UIButton) { changeServerValue(with: .increment) }
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/// the decrement button was hit.
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@IBAction func decrementButton(_ sender: UIButton) { changeServerValue(with: .decrement) }
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// MARK: - Internal Helpers
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/// Update the number on the server by a particular value. Note: the number passed in should only
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/// be one above or below the current number.
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private func changeServerValue(with type: Counter) {
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let ref = Database.database().reference(withPath: Constants.databasePath)
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// Update the current value of the number.
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ref.runTransactionBlock { (currentData) -> TransactionResult in
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guard let value = currentData.value as? Int else {
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return TransactionResult.abort()
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}
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currentData.value = value + type.intValue
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return TransactionResult.success(withValue: currentData)
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}
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}
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// MARK: - View Controller Lifecycle
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override func viewDidLoad() {
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super.viewDidLoad()
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// Observe the current value, and update the UI every time it changes.
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let ref = Database.database().reference(withPath: Constants.databasePath)
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ref.observe(.value) { [weak self] (snapshot) in
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guard let value = snapshot.value as? Int else {
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print("Error grabbing value from Snapshot!")
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return
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}
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self?.currentValue.text = "\(value)"
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}
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}
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// MARK: - Constants
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private struct Constants {
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static let databasePath = "magicSyncingCounter"
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}
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}
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