127 lines
3.8 KiB
Swift
Executable File
127 lines
3.8 KiB
Swift
Executable File
/*
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* Copyright 2020 Google LLC. All rights reserved.
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*
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this
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* file except in compliance with the License. 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 distributed under
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* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
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* ANY KIND, either express or implied. See the License for the specific language governing
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* permissions and limitations under the License.
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*/
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import GoogleMaps
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import UIKit
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class SnapshotReadyViewController: UIViewController {
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lazy var mapView: GMSMapView = {
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let camera = GMSCameraPosition(latitude: -33.868, longitude: 151.2086, zoom: 6)
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return GMSMapView(frame: .zero, camera: camera)
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}()
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private lazy var statusLabel: UILabel = UILabel()
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private lazy var waitButton: UIBarButtonItem = UIBarButtonItem()
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private var isAwaitingSnapshot = false {
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didSet {
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waitButton.isEnabled = !isAwaitingSnapshot
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if isAwaitingSnapshot {
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waitButton.title = "Waiting"
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} else {
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waitButton.title = "Wait for snapshot"
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}
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}
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}
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override func loadView() {
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view = mapView
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navigationController?.navigationBar.isTranslucent = false
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mapView.delegate = self
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// Add status label, initially hidden.
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statusLabel.alpha = 0
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statusLabel.autoresizingMask = .flexibleWidth
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statusLabel.backgroundColor = .blue
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statusLabel.textColor = .white
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statusLabel.textAlignment = .center
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view.addSubview(statusLabel)
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statusLabel.translatesAutoresizingMaskIntoConstraints = false
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NSLayoutConstraint.activate([
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statusLabel.leftAnchor.constraint(equalTo: view.leftAnchor),
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statusLabel.rightAnchor.constraint(equalTo: view.rightAnchor),
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statusLabel.heightAnchor.constraint(equalToConstant: 30),
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])
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if #available(iOS 11, *) {
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NSLayoutConstraint.activate([
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statusLabel.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor)
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])
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} else {
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NSLayoutConstraint.activate([
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statusLabel.topAnchor.constraint(equalTo: topLayoutGuide.topAnchor)
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])
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}
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// Add a wait button to signify on the next SnapshotReady event, a screenshot of the map will
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// be taken.
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waitButton = UIBarButtonItem(
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title: "Wait for snapshot", style: .plain, target: self, action: #selector(didTapWait))
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navigationItem.rightBarButtonItem = waitButton
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}
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@objc func didTapWait() {
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isAwaitingSnapshot = true
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}
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func takeSnapshot() {
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// Take a snapshot of the map.
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UIGraphicsBeginImageContextWithOptions(mapView.bounds.size, true, 0)
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mapView.drawHierarchy(in: mapView.bounds, afterScreenUpdates: true)
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let mapSnapshot = UIGraphicsGetImageFromCurrentImageContext()
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UIGraphicsEndImageContext()
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// Put snapshot image into an UIImageView and overlay on top of map.
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let imageView = UIImageView(image: mapSnapshot)
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imageView.layer.borderColor = UIColor.red.cgColor
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imageView.layer.borderWidth = 10
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mapView.addSubview(imageView)
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// Remove imageView after 1 second.
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DispatchQueue.main.asyncAfter(
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deadline: .now() + 1
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) {
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UIView.animate(
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withDuration: 1,
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animations: {
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imageView.alpha = 0
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},
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completion: { _ in
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imageView.removeFromSuperview()
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})
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}
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}
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}
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extension SnapshotReadyViewController: GMSMapViewDelegate {
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func mapViewSnapshotReady(_ mapView: GMSMapView) {
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if isAwaitingSnapshot {
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isAwaitingSnapshot = false
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takeSnapshot()
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}
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statusLabel.alpha = 0.8
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statusLabel.text = "Snapshot Ready"
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// Remove status label after 1 second.
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DispatchQueue.main.asyncAfter(
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deadline: .now() + 1
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) {
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self.statusLabel.alpha = 0
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}
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}
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}
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