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import GoogleMaps
import UIKit

class BasicMapViewController: UIViewController {
  var statusLabel: UILabel!

  override func viewDidLoad() {
    super.viewDidLoad()

    // Seattle coordinates
    let camera = GMSCameraPosition(latitude: 47.6089945, longitude: -122.3410462, zoom: 14)
    let mapView = GMSMapView(frame: view.bounds, camera: camera)
    mapView.delegate = self
    view = mapView
    navigationController?.navigationBar.isTranslucent = false

    statusLabel = UILabel(frame: .zero)
    statusLabel.alpha = 0.0
    statusLabel.backgroundColor = .blue
    statusLabel.textColor = .white
    statusLabel.textAlignment = .center
    view.addSubview(statusLabel)
    statusLabel.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
      statusLabel.topAnchor.constraint(equalTo: view.topAnchor),
      statusLabel.heightAnchor.constraint(equalToConstant: 30),
      statusLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor),
      statusLabel.trailingAnchor.constraint(equalTo: view.trailingAnchor),
    ])
  }
}

extension BasicMapViewController: GMSMapViewDelegate {
  func mapViewDidStartTileRendering(_ mapView: GMSMapView) {
    statusLabel.alpha = 0.8
    statusLabel.text = "Rendering"
  }

  func mapViewDidFinishTileRendering(_ mapView: GMSMapView) {
    statusLabel.alpha = 0.0
  }
}
BasicMapViewController.swift
      

#import "GoogleMapsDemos/Samples/BasicMapViewController.h"

#import <GoogleMaps/GoogleMaps.h>

@implementation BasicMapViewController {
  UILabel *_statusLabel;
}

- (void)viewDidLoad {
  [super viewDidLoad];
  // Seattle coordinates
  GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:47.6089945
                                                          longitude:-122.3410462
                                                               zoom:14];
  GMSMapView *view = [GMSMapView mapWithFrame:CGRectZero camera:camera];
  view.delegate = self;
  self.view = view;

  // Add status label, initially hidden.
  _statusLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 0, 30)];
  _statusLabel.alpha = 0.0f;
  _statusLabel.autoresizingMask = UIViewAutoresizingFlexibleWidth;
  _statusLabel.backgroundColor = [UIColor blueColor];
  _statusLabel.textColor = [UIColor whiteColor];
  _statusLabel.textAlignment = NSTextAlignmentCenter;

  [view addSubview:_statusLabel];
}

- (void)mapViewDidStartTileRendering:(GMSMapView *)mapView {
  _statusLabel.alpha = 0.8f;
  _statusLabel.text = @"Rendering";
}

- (void)mapViewDidFinishTileRendering:(GMSMapView *)mapView {
  _statusLabel.alpha = 0.0f;
}

@end
BasicMapViewController.m