Fix retain cycles

Source/FolioReaderAudioPlayer.swift

@@ -10,15 +10,15 @@ import UIKit
 import AVFoundation
 import MediaPlayer
 
-protocol FolioReaderAudioPlayerDelegate {
+protocol FolioReaderAudioPlayerDelegate: class {
     /**
      Notifies that Player read all sentence
      */
     func didReadSentence()
 }
 
 class FolioReaderAudioPlayer: NSObject, AVAudioPlayerDelegate, AVSpeechSynthesizerDelegate {
-    var delegate: FolioReaderAudioPlayerDelegate!
+    weak var delegate: FolioReaderAudioPlayerDelegate!
     var isTextToSpeech = false
     var synthesizer: AVSpeechSynthesizer!
     var playing = false

Source/FolioReaderCenter.swift

@@ -38,7 +38,7 @@ enum ScrollDirection: Int {
 
 class ScrollScrubber: NSObject, UIScrollViewDelegate {
 
-    var delegate: FolioReaderCenter!
+    weak var delegate: FolioReaderCenter!
     var showSpeed = 0.6
     var hideSpeed = 0.6
     var hideDelay = 1.0
@@ -232,7 +232,7 @@ class FolioReaderCenter: UIViewController, UICollectionViewDelegate, UICollectio
     var totalPages: Int!
     var tempFragment: String?
     var currentPage: FolioReaderPage!
-    var folioReaderContainer: FolioReaderContainer!
+    weak var folioReaderContainer: FolioReaderContainer!
     var animator: ZFModalTransitionAnimator!
     var pageIndicatorView: FolioReaderPageIndicator!
     var bookShareLink: String?

Source/FolioReaderContainer.swift

@@ -23,7 +23,7 @@ enum SlideOutState {
     }
 }
 
-protocol FolioReaderContainerDelegate {
+protocol FolioReaderContainerDelegate: class {
     /**
     Notifies that the menu was expanded.
     */
@@ -78,7 +78,7 @@ class FolioReaderContainer: UIViewController, FolioReaderSidePanelDelegate {
             kCurrentAudioRate: 1,
             kCurrentHighlightStyle: 0,
             kCurrentMediaOverlayStyle: MediaOverlayStyle.Default.rawValue
-            ])
+        ])
     }
 
     // MARK: - View life cicle

Source/FolioReaderKit.swift

@@ -58,10 +58,10 @@ public class FolioReader : NSObject {
 
     static let sharedInstance = FolioReader()
     static let defaults = NSUserDefaults.standardUserDefaults()
-    var readerCenter: FolioReaderCenter!
-    var readerSidePanel: FolioReaderSidePanel!
-    var readerContainer: FolioReaderContainer!
-    var readerAudioPlayer: FolioReaderAudioPlayer!
+    weak var readerCenter: FolioReaderCenter!
+    weak var readerSidePanel: FolioReaderSidePanel!
+    weak var readerContainer: FolioReaderContainer!
+    weak var readerAudioPlayer: FolioReaderAudioPlayer!
     var isReaderOpen = false
     var isReaderReady = false
 

Source/FolioReaderPage.swift

@@ -19,7 +19,7 @@ class FolioReaderPage: UICollectionViewCell, UIWebViewDelegate, UIGestureRecogni
 
     var pageNumber: Int!
     var webView: UIWebView!
-    var delegate: FolioPageDelegate!
+    weak var delegate: FolioPageDelegate!
     private var shouldShowBar = true
     private var menuIsVisible = false
 

Source/FolioReaderSidePanel.swift

@@ -18,7 +18,7 @@ protocol FolioReaderSidePanelDelegate {
 
 class FolioReaderSidePanel: UIViewController, UITableViewDelegate, UITableViewDataSource {
 
-    var delegate: FolioReaderSidePanelDelegate?
+    weak var delegate: FolioReaderSidePanelDelegate?
     var tableView: UITableView!
     var toolBar: UIToolbar!
     let toolBarHeight: CGFloat = 50