purchases-ios/Examples/MagicWeather/MagicWeather/Sources/Controllers/WeatherViewController.swift

//
//  WeatherViewController.swift
//  Magic Weather
//
//  Created by Cody Kerns on 12/14/20.
//

import UIKit
import RevenueCat
import RevenueCatUI
/*
 The app's main view controller that displays our pretend weather data.
 Configured in /Resources/UI/Main.storyboard
 */

class WeatherViewController: UIViewController {

    @IBOutlet var temperatureLabel: UILabel!
    @IBOutlet var environmentButton: UIButton!
    @IBOutlet var magicButton: UIButton!

    var currentEnvironment: SampleWeatherData.Environment = .earth
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        /// - Set the default weather data on load
        setWeatherData(.testCold)
    }

    @IBAction
    func performMagic() {
        /*
         We should check if we can magically change the weather (subscription active) and if not, display the paywall.
         */
        Purchases.shared.getCustomerInfo { (customerInfo, error) in
            if customerInfo?.entitlements[Constants.entitlementID]?.isActive == true {
                self.setWeatherData(SampleWeatherData.generateSampleData(for: self.currentEnvironment))
            } else {
                self.fetchOfferings { offerings in
                    DispatchQueue.main.async {
                        self.presentPaywall(offering: offerings)
                    }
                }
            }
        }
    }
    
    private func fetchOfferings(completion: @escaping (Offering?) -> Void) {
        // We have set a "change_weather" placement targetting rule in our project
        Purchases.shared.getOfferings { offerings, error in
            if let offering = offerings?.currentOffering(forPlacement: "change_weather") {
                completion(offering)
            } else {
                completion(offerings?.current)
            }
        }
    }
    
    private func presentPaywall(offering: Offering?) {
        // If the offering is nil, Paywalls use the default one
        let controller = PaywallViewController(offering: offering)
        controller.delegate = self
        present(controller, animated: true, completion: nil)
    }
    
    func setWeatherData(_ data: SampleWeatherData) {
        self.temperatureLabel.text = "\(data.emoji)\n\(data.temperature)°\(data.unit.rawValue.capitalized)"
        self.environmentButton.setTitle("  " + data.environment.rawValue.capitalized, for: .normal)
        self.view.backgroundColor = data.weatherColor
    }
}

extension WeatherViewController: PaywallViewControllerDelegate {
    /// - Notifies when a purchased has finished.
    func paywallViewController(_ controller: PaywallViewController,
                               didFinishPurchasingWith customerInfo: CustomerInfo) {
    }
}