New lesson on all devices and iOS versions

Podfile

@@ -73,7 +73,7 @@ def testing_pods
 end
 
 target 'Stepic' do
-    platform :ios, '9.0'
+    platform :ios, '11.0'
     all_pods
     target 'StepicTests' do
         inherit! :search_paths

Podfile.lock

@@ -346,6 +346,6 @@ SPEC CHECKSUMS:
   VK-ios-sdk: 7fd48bc5aaa6b96c3197c1987eb6593f2ea67331
   YandexMobileMetrica: f18374ee6977a4cd1d0a86298a0df4ad7baf4135
 
-PODFILE CHECKSUM: 0c6f3046cd7795142e613d85d7621ac20ce19346
+PODFILE CHECKSUM: 12d559e44fc554e5784933ff129a59fc9eeb8241
 
 COCOAPODS: 1.8.0

Stepic/AdaptiveRatingsViewController.swift

@@ -125,11 +125,7 @@ class AdaptiveRatingsViewController: UIViewController {
 
         tableView.register(UINib(nibName: "LeaderboardTableViewCell", bundle: nil), forCellReuseIdentifier: LeaderboardTableViewCell.reuseId)
 
-        #if swift(>=3.2)
-            if #available(iOS 11.0, *) {
-                tableView.contentInsetAdjustmentBehavior = UIScrollView.ContentInsetAdjustmentBehavior.never
-            }
-        #endif
+        self.tableView.contentInsetAdjustmentBehavior = .never
     }
 }
 

Stepic/AudioManager.swift

@@ -22,11 +22,7 @@ class AudioManager: NSObject {
         set(ignore) {
             do {
                 print("setting ignore status to \(ignore)")
-                if #available(iOS 10.0, *) {
-                    try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback, mode: .default)
-                } else {
-                    try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback, options: [])
-                }
+                try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback, mode: .default)
                 try AVAudioSession.sharedInstance().setActive(!ignore)
             } catch {
                 print("Error while setting ignore mute switch")
@@ -36,11 +32,7 @@ class AudioManager: NSObject {
 
     func initAudioSession() -> Bool {
         do {
-            if #available(iOS 10.0, *) {
-                try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback, mode: .default)
-            } else {
-                try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback, options: [])
-            }
+            try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback, mode: .default)
             return true
         } catch {
             return false

Stepic/CardStepViewController.swift

@@ -37,11 +37,15 @@ class CardStepViewController: UIViewController, CardStepView {
 
         setupWebView()
         presenter?.refreshStep()
-        NotificationCenter.default.addObserver(self, selector: #selector(self.didScreenRotate), name: UIDevice.orientationDidChangeNotification, object: nil)
 
-        if #available(iOS 11.0, *) {
-            scrollView.contentInsetAdjustmentBehavior = .never
-        }
+        self.scrollView.contentInsetAdjustmentBehavior = .never
+
+        NotificationCenter.default.addObserver(
+            self,
+            selector: #selector(self.didScreenRotate),
+            name: UIDevice.orientationDidChangeNotification,
+            object: nil
+        )
     }
 
     @objc func didScreenRotate() {

Stepic/CertificatesViewController.swift

@@ -98,11 +98,7 @@ final class CertificatesViewController: UIViewController, ControllerWithStepikPl
             action: #selector(CertificatesViewController.refreshCertificates),
             for: .valueChanged
         )
-        if #available(iOS 10.0, *) {
-            tableView.refreshControl = refreshControl
-        } else {
-            tableView.addSubview(refreshControl)
-        }
+        tableView.refreshControl = refreshControl
         refreshControl.layoutIfNeeded()
         refreshControl.beginRefreshing()
 
@@ -111,9 +107,7 @@ final class CertificatesViewController: UIViewController, ControllerWithStepikPl
 
         tableView.backgroundColor = UIColor.groupTableViewBackground
 
-        if #available(iOS 11.0, *) {
-            tableView.contentInsetAdjustmentBehavior = .never
-        }
+        tableView.contentInsetAdjustmentBehavior = .never
 
         DispatchQueue.main.async {
             self.displayRefreshing()

Stepic/ChoiceQuizViewController.swift

@@ -20,11 +20,7 @@ final class ChoiceQuizViewController: QuizViewController {
     var cellHeights: [CGFloat?] = []
 
     var cellWidth: CGFloat {
-        if #available(iOS 11.0, *) {
-            return tableView.bounds.width - view.safeAreaInsets.left - view.safeAreaInsets.right
-        } else {
-            return tableView.bounds.width
-        }
+        return tableView.bounds.width - view.safeAreaInsets.left - view.safeAreaInsets.right
     }
 
     override func viewDidLoad() {

Stepic/CodeInputAccessoryCollectionViewCell.swift

@@ -7,26 +7,14 @@
 //
 
 import UIKit
-import Foundation
-
-class CodeInputAccessoryCollectionViewCell: UICollectionViewCell {
 
+final class CodeInputAccessoryCollectionViewCell: UICollectionViewCell {
     @IBOutlet weak var textLabel: UILabel!
+
     var text: String?
     var size: CodeInputAccessorySize?
 
-    override func awakeFromNib() {
-        super.awakeFromNib()
-    }
-
-    fileprivate func setRoundedStyle() {
-        self.layer.cornerRadius = 4.0
-        self.layer.borderWidth = 1.0
-        self.layer.borderColor = UIColor.clear.cgColor
-        self.layer.masksToBounds = true
-    }
-
-    class func width(for text: String, size: CodeInputAccessorySize) -> CGFloat {
+    static func width(for text: String, size: CodeInputAccessorySize) -> CGFloat {
         let label = UILabel(frame: CGRect(x: 0, y: 0, width: CGFloat.greatestFiniteMagnitude, height: CGFloat.greatestFiniteMagnitude))
         label.numberOfLines = 1
         label.text = text
@@ -45,4 +33,11 @@ class CodeInputAccessoryCollectionViewCell: UICollectionViewCell {
         textLabel.font = regularCourier
         setRoundedStyle()
     }
+
+    private func setRoundedStyle() {
+        self.layer.cornerRadius = 4.0
+        self.layer.borderWidth = 1.0
+        self.layer.borderColor = UIColor.clear.cgColor
+        self.layer.masksToBounds = true
+    }
 }

Stepic/CodeInputAccessoryView.swift

@@ -9,8 +9,7 @@
 import Foundation
 import SnapKit
 
-class CodeInputAccessoryView: NibInitializableView {
-
+final class CodeInputAccessoryView: NibInitializableView {
     @IBOutlet weak var hideKeyboardImageView: UIImageView!
     @IBOutlet weak var collectionView: UICollectionView!
 
@@ -21,6 +20,7 @@ class CodeInputAccessoryView: NibInitializableView {
             collectionView.reloadData()
         }
     }
+
     var size: CodeInputAccessorySize = .small
 
     override var nibName: String {

Stepic/CodePlaygroundManager.swift

@@ -8,9 +8,7 @@
 
 import Foundation
 
-class CodePlaygroundManager {
-    init() {}
-
+final class CodePlaygroundManager {
     let closers: [String: String] = ["{": "}", "[": "]", "(": ")", "\"": "\"", "'": "'"]
 
     typealias Autocomplete = (suggestions: [String], prefix: String)