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Ben Reed
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WIP Add SwiftUI Quickstart for Storage
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‎storage/Podfile‎

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# StorageExample
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use_frameworks!
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platform :ios, '10.0'
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pod 'Firebase/Analytics'
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pod 'Firebase/Auth'
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pod 'Firebase/Storage'
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target 'StorageExample' do
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platform :ios, '10.0'
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pod 'Firebase/Analytics'
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pod 'Firebase/Auth'
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pod 'Firebase/Storage'
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end
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target 'StorageExampleSwift' do
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platform :ios, '10.0'
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pod 'Firebase/Analytics'
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pod 'Firebase/Auth'
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pod 'Firebase/Storage'
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pod 'FirebaseStorageSwift', "~> 7.0-beta"
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end
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target 'StorageExampleSwiftUI' do
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platform :ios, '13.0'
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pod 'Firebase/Analytics'
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pod 'Firebase/Auth'
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pod 'Firebase/Storage'
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pod 'FirebaseStorageSwift', "~> 7.0-beta"
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pod 'FirebaseStorageSwift', "~> 7.0-beta"
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end
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target 'StorageExampleTests' do

‎storage/Podfile.lock‎

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nanopb: 59221d7f958fb711001e6a449489542d92ae113e
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PromisesObjC: 3113f7f76903778cf4a0586bd1ab89329a0b7b97
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PODFILE CHECKSUM: 68e67a7f5b716247bf88b244cb2b3cc55d2e53ec
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PODFILE CHECKSUM: d7464278d730121dc09bc1404e6cbe6af4459ccc
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COCOAPODS: 1.10.1

‎storage/StorageExample.xcodeproj/project.pbxproj‎

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‎storage/StorageExampleSwiftUI/ImagePicker.swift‎

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// Copyright 2021 Google LLC
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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 SwiftUI
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import Firebase
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/// ImagePickerRepresentable wraps a UIImagePickerController, so it is accessible through SwiftUI.
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struct ImagePickerRepresentable {
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enum Source {
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case camera
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case photoLibrary
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}
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/// Denotes whether the user is taking a photo or selecting one.
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var source: Source
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/// Persistent storage which retains the image.
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@ObservedObject var store: ImageStore
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/// Binds to whether the image picker is visible.
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@Binding var visible: Bool
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/// Completion handler that is invoked when the image picker dismisses.
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var completion: () -> Void
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/// Coordinator is an internal class that acts as a delegate for the image picker.
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class Coordinator: NSObject {
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private var representable: ImagePickerRepresentable
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private var store: ImageStore
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init(representable: ImagePickerRepresentable, store: ImageStore) {
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self.representable = representable
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self.store = store
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}
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}
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}
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extension ImagePickerRepresentable: UIViewControllerRepresentable {
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typealias UIViewControllerType = UIImagePickerController
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/// Invoked by the system to setup a coordinator that the UIImagePickerViewController can use.
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/// - Returns: The coordinator.
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func makeCoordinator() -> Coordinator {
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Coordinator(representable: self, store: self.store)
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}
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func makeUIViewController(context: Context) -> UIImagePickerController {
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let imagePicker = UIImagePickerController()
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switch self.source {
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case .camera:
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imagePicker.sourceType = .camera
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imagePicker.cameraCaptureMode = .photo
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case .photoLibrary:
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imagePicker.sourceType = .photoLibrary
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}
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imagePicker.delegate = context.coordinator
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return imagePicker
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}
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/// Required to implement, but unnecessary. We do not need to invalidate the SwiftUI canvas.
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func updateUIViewController(_ uiViewController: UIImagePickerController, context: Context) { }
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}
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extension ImagePickerRepresentable.Coordinator: UIImagePickerControllerDelegate {
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func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
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guard let image = info[UIImagePickerController.InfoKey.originalImage] as? UIImage else { return }
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let imagePath = "\(Auth.auth().currentUser!.uid)/\(Int(Date.timeIntervalSinceReferenceDate * 1000)).jpg"
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self.store.uploadImage(image, atPath: imagePath)
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// TODO: Move UserDefaults and imagePath logic into store.
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UserDefaults.standard.setValue(imagePath, forKey: self.store.imagePathKey)
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self.store.image = image
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self.representable.visible = false
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picker.dismiss(animated: true, completion: self.representable.completion)
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}
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func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
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self.representable.visible = false
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picker.dismiss(animated: true, completion: self.representable.completion)
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}
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}
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/// The coordinator must implement the UINavigationControllerDelegate protocol in order to be the UIImagePickerController's delegate.
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extension ImagePickerRepresentable.Coordinator: UINavigationControllerDelegate { }

‎storage/StorageExampleSwiftUI/ImageStore.swift‎

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// Copyright 2021 Google LLC
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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 Firebase
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import FirebaseStorageSwift
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/// ImageStore facilitates saving and downloading images.
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public class ImageStore: ObservableObject {
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/// Reference to Firebase storage.
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private var storage: Storage
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/// Quality for JPEG images where 1.0 is the best quality and 0.0 is the worst.
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public var compressionQuality: CGFloat = 0.8
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/// UserDefaults key that will have a value containing the path of the last image.
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public let imagePathKey = "imagePath"
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/// Binds to the current image.
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@Published var image: UIImage?
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lazy var localImageFileDirectory: String = {
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let paths = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
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let documentsDirectory = paths[0]
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return "file:\(documentsDirectory)"
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}()
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public init(storage: Storage) {
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self.storage = storage
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}
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/// Uploads an image to Firebase storage.
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/// - Parameters:
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/// - image: Image to upload.
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/// - imagePath: Path of the image in Firebase storage.
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public func uploadImage(_ image: UIImage, atPath imagePath: String) {
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guard let imageData = image.jpegData(compressionQuality: compressionQuality) else { return }
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let imageMetadata = StorageMetadata()
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imageMetadata.contentType = "image/jpeg"
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let storageRef = storage.reference(withPath: imagePath)
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storageRef.putData(imageData, metadata: imageMetadata) { result in
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switch result {
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case .success:
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break
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case let .failure(error):
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_ = error
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break
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}
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}
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}
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/// Downloads an image from Firebase storage.
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/// - Parameter imagePath: Path of the image in Firebase storage.
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public func downloadImage(atPath imagePath: String) {
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guard let imageURL = URL(string: "\(self.localImageFileDirectory)/\(imagePath)") else { return }
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self.storage.reference().child(imagePath).write(toFile: imageURL) { result in
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switch result {
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case let .success(downloadedFileURL):
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self.image = UIImage(contentsOfFile: downloadedFileURL.path)
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case let .failure(error):
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print("Error downloading: \(error)")
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}
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}
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}
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}

‎storage/StorageExampleSwiftUI/ImageView.swift‎

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// Copyright 2021 Google LLC
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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 SwiftUI
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import Firebase
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/// ImageView provides the main content for the app. It displays a current image and provides controls to change
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/// it by taking a new one with the camera, selecting one from the photo library or downloading one from Firebase
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/// storage.
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struct ImageView: View {
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/// Manages retrieval and persistence of the current image.
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@StateObject private var photoStore = ImageStore(storage: Storage.storage())
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/// Indicates whether the user is selecting an image from the photo library.
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@State var isSelectingImage = false
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/// Indicates whether the user is taking an image using the camera.
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@State var isTakingPhoto = false
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/// Indicates whether a submenu that allows the user to choose whether to select or take a photo should be
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/// visible.
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@State var showUploadMenu = false
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var body: some View {
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NavigationView {
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VStack {
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Image(uiImage: photoStore.image ?? UIImage())
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.resizable()
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.aspectRatio(contentMode: .fit)
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}
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.navigationTitle("Firebase Storage")
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.toolbar {
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ToolbarItemGroup(placement: .bottomBar) {
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if showUploadMenu {
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Button("❌") {
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showUploadMenu = false
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}
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Spacer()
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Button("Take Photo") {
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isTakingPhoto = true
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}.sheet(isPresented: $isTakingPhoto) {
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ImagePickerRepresentable(source: .camera, store: photoStore, visible: $isTakingPhoto, completion: {
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showUploadMenu = false
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})
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}.disabled(!UIImagePickerController.isSourceTypeAvailable(.camera))
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Button("Select Image") {
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isSelectingImage = true
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}.sheet(isPresented: $isSelectingImage) {
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ImagePickerRepresentable(source: .photoLibrary, store: photoStore, visible: $isSelectingImage, completion: {
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showUploadMenu = false
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})
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}
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} else {
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Button("Upload") {
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showUploadMenu = true
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}
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Spacer()
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Button("Download") {
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self.downloadImage()
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}
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}
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}
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}
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}.onAppear {
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downloadImage()
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}
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}
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// TODO: Move this logic into the store, relying on its binding alone.
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func downloadImage() {
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if let imagePath = UserDefaults.standard.string(forKey: self.photoStore.imagePathKey) {
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self.photoStore.downloadImage(atPath: imagePath)
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}
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}
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}
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struct ContentView_Previews: PreviewProvider {
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static var previews: some View {
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ImageView()
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}
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}

‎storage/StorageExampleSwiftUI/Info.plist‎

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>CFBundleDevelopmentRegion</key>
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<string>$(DEVELOPMENT_LANGUAGE)</string>
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<key>CFBundleExecutable</key>
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<string>$(EXECUTABLE_NAME)</string>
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<key>CFBundleIdentifier</key>
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<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
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<key>CFBundleInfoDictionaryVersion</key>
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<string>6.0</string>
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<key>CFBundleName</key>
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<string>$(PRODUCT_NAME)</string>
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<key>CFBundlePackageType</key>
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<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
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<key>CFBundleShortVersionString</key>
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<string>1.0</string>
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<key>CFBundleVersion</key>
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<string>1</string>
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<key>LSRequiresIPhoneOS</key>
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<true/>
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<key>NSCameraUsageDescription</key>
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<string>Take and upload photos to cloud storage</string>
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<key>NSPhotoLibraryUsageDescription</key>
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<string>Upload photos to cloud storage</string>
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<key>UIApplicationSceneManifest</key>
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<dict>
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<key>UIApplicationSupportsMultipleScenes</key>
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<true/>
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</dict>
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<key>UIApplicationSupportsIndirectInputEvents</key>
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<true/>
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<key>UILaunchScreen</key>
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<dict/>
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<key>UIRequiredDeviceCapabilities</key>
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<array>
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<string>armv7</string>
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</array>
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<key>UISupportedInterfaceOrientations</key>
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<array>
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<string>UIInterfaceOrientationPortrait</string>
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<string>UIInterfaceOrientationLandscapeLeft</string>
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<string>UIInterfaceOrientationLandscapeRight</string>
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</array>
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<key>UISupportedInterfaceOrientations~ipad</key>
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<array>
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<string>UIInterfaceOrientationPortrait</string>
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<string>UIInterfaceOrientationPortraitUpsideDown</string>
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<string>UIInterfaceOrientationLandscapeLeft</string>
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<string>UIInterfaceOrientationLandscapeRight</string>
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</array>
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</dict>
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</plist>

‎storage/StorageExampleSwiftUI/Preview Content/Preview Assets.xcassets/Contents.json‎

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{
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"info" : {
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"author" : "xcode",
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"version" : 1
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}
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}

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