From 93bab86e0913805337ab3ed4770bc1b05f98473f Mon Sep 17 00:00:00 2001
From: Rodrigo Leite <rodrigo.freitas.leite@gmail.com>
Date: Mon, 28 Nov 2016 11:36:35 -0200
Subject: [PATCH 1/2] add page control to the component

---
 Example/Optik/ViewController.swift      |  4 +-
 Optik/Classes/AlbumViewController.swift | 94 +++++++++++++++++++++++--
 Optik/Classes/Optik.swift               | 18 +++--
 3 files changed, 104 insertions(+), 12 deletions(-)

diff --git a/Example/Optik/ViewController.swift b/Example/Optik/ViewController.swift
index db83faf..64399d5 100644
--- a/Example/Optik/ViewController.swift
+++ b/Example/Optik/ViewController.swift
@@ -45,7 +45,7 @@ internal final class ViewController: UIViewController {
     @IBAction private func presentLocalImageViewer(_ sender: UIButton) {
         let viewController = Optik.imageViewer(withImages: localImages,
                                                initialImageDisplayIndex: currentLocalImageIndex,
-                                               delegate: self)
+                                               delegate: self, enablePageControl: true)
         
         present(viewController, animated: true, completion: nil)
     }
@@ -62,7 +62,7 @@ internal final class ViewController: UIViewController {
         let urls = [url1, url2, url3, url4]
         let imageDownloader = AlamofireImageDownloader()
         
-        let viewController = Optik.imageViewer(withURLs: urls, imageDownloader: imageDownloader)
+        let viewController = Optik.imageViewer(withURLs: urls, imageDownloader: imageDownloader, enablePageControl: true)
         present(viewController, animated: true, completion: nil)
     }
 
diff --git a/Optik/Classes/AlbumViewController.swift b/Optik/Classes/AlbumViewController.swift
index 9d00651..89cde88 100644
--- a/Optik/Classes/AlbumViewController.swift
+++ b/Optik/Classes/AlbumViewController.swift
@@ -58,7 +58,7 @@ internal final class AlbumViewController: UIViewController {
         return viewControllers[0] as? ImageViewController
     }
     
-    private var imageData: ImageData
+    fileprivate var imageData: ImageData
     private var initialImageDisplayIndex: Int
     private var activityIndicatorColor: UIColor?
     private var dismissButtonImage: UIImage?
@@ -69,13 +69,16 @@ internal final class AlbumViewController: UIViewController {
     
     private var transitionController: TransitionController = TransitionController()
     
+    fileprivate var pageControl: UIPageControl?
+    
     // MARK: - Init/Deinit
     
     init(imageData: ImageData,
          initialImageDisplayIndex: Int,
          activityIndicatorColor: UIColor?,
          dismissButtonImage: UIImage?,
-         dismissButtonPosition: DismissButtonPosition) {
+         dismissButtonPosition: DismissButtonPosition,
+         enablePageControl: Bool) {
         
         self.imageData = imageData
         self.initialImageDisplayIndex = initialImageDisplayIndex
@@ -83,9 +86,16 @@ internal final class AlbumViewController: UIViewController {
         self.dismissButtonImage = dismissButtonImage
         self.dismissButtonPosition = dismissButtonPosition
         
-        pageViewController = UIPageViewController(transitionStyle: .scroll,
-                                                  navigationOrientation: .horizontal,
+        if enablePageControl {
+            pageViewController = UIPageViewController(transitionStyle: .scroll,
+                                                  navigationOrientation: .vertical,
                                                   options: [UIPageViewControllerOptionInterPageSpacingKey : Constants.SpacingBetweenImages])
+            pageControl = UIPageControl()
+        } else {
+            pageViewController = UIPageViewController(transitionStyle: .scroll,
+                                                      navigationOrientation: .horizontal,
+                                                      options: [UIPageViewControllerOptionInterPageSpacingKey : Constants.SpacingBetweenImages])
+        }
 
         super.init(nibName: nil, bundle: nil)
         
@@ -147,6 +157,7 @@ internal final class AlbumViewController: UIViewController {
         didMove(toParentViewController: pageViewController)
         
         setupDismissButton()
+        setupPageControl()
         setupPanGestureRecognizer()
     }
     
@@ -163,6 +174,56 @@ internal final class AlbumViewController: UIViewController {
         }
     }
     
+    private func setupPageControl() {
+        
+        if let page = pageControl {
+            page.currentPage = 0
+            page.pageIndicatorTintColor = UIColor.red
+            page.translatesAutoresizingMaskIntoConstraints = false
+            page.transform = CGAffineTransform(rotationAngle: CGFloat(M_PI/2))
+            view.addSubview(page)
+            
+            view.addConstraint(
+                NSLayoutConstraint(item: page,
+                                   attribute: .trailing,
+                                   relatedBy: .equal,
+                                   toItem: view,
+                                   attribute: .trailing,
+                                   multiplier: 1,
+                                   constant: -10)
+            )
+            view.addConstraint(
+                NSLayoutConstraint(item: page,
+                                   attribute: .centerY,
+                                   relatedBy: .equal,
+                                   toItem: view,
+                                   attribute: .centerY,
+                                   multiplier: 1,
+                                   constant: 0)
+            )
+            view.addConstraint(
+                NSLayoutConstraint(item: page,
+                                   attribute: .width,
+                                   relatedBy: .equal,
+                                   toItem: nil,
+                                   attribute: .notAnAttribute,
+                                   multiplier: 1,
+                                   constant: 30)
+            )
+            view.addConstraint(
+                NSLayoutConstraint(item: page,
+                                   attribute: .height,
+                                   relatedBy: .equal,
+                                   toItem: nil,
+                                   attribute: .notAnAttribute,
+                                   multiplier: 1,
+                                   constant: 25)
+            )
+        }
+        
+    }
+    
+    
     private func setupDismissButton() {
         let dismissButton = UIButton(type: .custom)
         dismissButton.translatesAutoresizingMaskIntoConstraints = false
@@ -226,12 +287,14 @@ internal final class AlbumViewController: UIViewController {
                 return nil
             }
             
+            pageControl?.numberOfPages = images.count
             return ImageViewController(image: images[index], index: index)
         case .remote(let urls, let imageDownloader):
             guard index >= 0 && index < urls.count else {
                 return nil
             }
             
+            pageControl?.numberOfPages = urls.count
             let imageViewController = ImageViewController(activityIndicatorColor: activityIndicatorColor, index: index)
             let url = urls[index]
             
@@ -245,6 +308,7 @@ internal final class AlbumViewController: UIViewController {
                     imageViewController.image = image
                     })
             }
+
             
             return imageViewController
         }
@@ -306,6 +370,28 @@ extension AlbumViewController: UIPageViewControllerDelegate {
         
         if let currentImageIndex = currentImageViewController?.index {
             imageViewerDelegate?.imageViewerDidDisplayImage(at: currentImageIndex)
+            pageControl?.currentPage = currentImageIndex
+        }
+    }
+    
+    func pageViewController(pageViewController: UIPageViewController, spineLocationForInterfaceOrientation orientation: UIInterfaceOrientation) -> UIPageViewControllerSpineLocation {
+        return .max
+    }
+    
+    func presentationCountForPageViewController(pageViewController: UIPageViewController) -> Int {
+        return numberOfImages()
+    }
+    
+    func presentationIndexForPageViewController(pageViewController: UIPageViewController) -> Int {
+        return currentImageViewController?.index ?? 0
+    }
+    
+    private func numberOfImages() -> Int {
+        switch imageData {
+        case .local(images: let images):
+            return images.count
+        case .remote(urls: let urls, imageDownloader: _):
+            return urls.count
         }
     }
     
diff --git a/Optik/Classes/Optik.swift b/Optik/Classes/Optik.swift
index fc54d43..f0d8c0b 100644
--- a/Optik/Classes/Optik.swift
+++ b/Optik/Classes/Optik.swift
@@ -25,11 +25,13 @@ public func imageViewer(withImages images: [UIImage],
                                    initialImageDisplayIndex: Int = 0,
                                    delegate: ImageViewerDelegate? = nil,
                                    dismissButtonImage: UIImage? = nil,
-                                   dismissButtonPosition: DismissButtonPosition = .topLeading) -> UIViewController {
+                                   dismissButtonPosition: DismissButtonPosition = .topLeading,
+                                   enablePageControl: Bool) -> UIViewController {
     let albumViewController = imageViewer(withData: .local(images: images),
                                           initialImageDisplayIndex: initialImageDisplayIndex,
                                           dismissButtonImage: dismissButtonImage,
-                                          dismissButtonPosition: dismissButtonPosition)
+                                          dismissButtonPosition: dismissButtonPosition,
+                                          enablePageControl: enablePageControl)
     albumViewController.modalPresentationStyle = .custom
     albumViewController.imageViewerDelegate = delegate
     
@@ -53,12 +55,14 @@ public func imageViewer(withURLs urls: [URL],
                                  imageDownloader: ImageDownloader,
                                  activityIndicatorColor: UIColor = .white,
                                  dismissButtonImage: UIImage? = nil,
-                                 dismissButtonPosition: DismissButtonPosition = .topLeading) -> UIViewController {
+                                 dismissButtonPosition: DismissButtonPosition = .topLeading,
+                                 enablePageControl: Bool) -> UIViewController {
     return imageViewer(withData: .remote(urls: urls, imageDownloader: imageDownloader),
                        initialImageDisplayIndex: initialImageDisplayIndex,
                        activityIndicatorColor: activityIndicatorColor,
                        dismissButtonImage: dismissButtonImage,
-                       dismissButtonPosition: dismissButtonPosition)
+                       dismissButtonPosition: dismissButtonPosition,
+                       enablePageControl: enablePageControl)
 }
 
 // MARK: - Private functions
@@ -67,7 +71,8 @@ private func imageViewer(withData imageData: ImageData,
                                   initialImageDisplayIndex: Int,
                                   activityIndicatorColor: UIColor? = nil,
                                   dismissButtonImage: UIImage?,
-                                  dismissButtonPosition: DismissButtonPosition) -> AlbumViewController {
+                                  dismissButtonPosition: DismissButtonPosition,
+                                  enablePageControl: Bool) -> AlbumViewController {
     let bundle = Bundle(for: AlbumViewController.self)
     let defaultDismissButtonImage = UIImage(named: "DismissIcon", in: bundle, compatibleWith: nil)
     
@@ -75,5 +80,6 @@ private func imageViewer(withData imageData: ImageData,
                                initialImageDisplayIndex: initialImageDisplayIndex,
                                activityIndicatorColor: activityIndicatorColor,
                                dismissButtonImage: dismissButtonImage ?? defaultDismissButtonImage,
-                               dismissButtonPosition: dismissButtonPosition)
+                               dismissButtonPosition: dismissButtonPosition,
+                               enablePageControl: enablePageControl)
 }

From ced8a392096dac0fb335ac7400b900dfd60afb92 Mon Sep 17 00:00:00 2001
From: Rodrigo Leite <rodrigo.freitas.leite@gmail.com>
Date: Mon, 28 Nov 2016 12:08:24 -0200
Subject: [PATCH 2/2] add actionButton

---
 .../AppIcon.appiconset/Contents.json          |  12 +++-
 Example/Optik/Images.xcassets/Contents.json   |   6 ++
 .../heart-empty.imageset/Contents.json        |  12 ++++
 .../heart-empty.imageset/heart.pdf            | Bin 0 -> 38700 bytes
 .../heart-full.imageset/Contents.json         |  12 ++++
 .../heart-full.imageset/heart-fill.pdf        | Bin 0 -> 44772 bytes
 Example/Optik/ViewController.swift            |  16 +++++
 Optik/Classes/ActionButtonPosition.swift      |  34 +++++++++
 Optik/Classes/AlbumViewController.swift       |  32 +++++++--
 Optik/Classes/ImageViewController.swift       |  65 ++++++++++++++++--
 Optik/Classes/ImageViewerDelegate.swift       |  16 +++++
 Optik/Classes/Optik.swift                     |  18 +++--
 12 files changed, 207 insertions(+), 16 deletions(-)
 create mode 100644 Example/Optik/Images.xcassets/Contents.json
 create mode 100644 Example/Optik/Images.xcassets/heart-empty.imageset/Contents.json
 create mode 100644 Example/Optik/Images.xcassets/heart-empty.imageset/heart.pdf
 create mode 100644 Example/Optik/Images.xcassets/heart-full.imageset/Contents.json
 create mode 100644 Example/Optik/Images.xcassets/heart-full.imageset/heart-fill.pdf
 create mode 100644 Optik/Classes/ActionButtonPosition.swift

diff --git a/Example/Optik/Images.xcassets/AppIcon.appiconset/Contents.json b/Example/Optik/Images.xcassets/AppIcon.appiconset/Contents.json
index d3942e9..b8236c6 100644
--- a/Example/Optik/Images.xcassets/AppIcon.appiconset/Contents.json
+++ b/Example/Optik/Images.xcassets/AppIcon.appiconset/Contents.json
@@ -1,5 +1,15 @@
 {
   "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "20x20",
+      "scale" : "3x"
+    },
     {
       "idiom" : "iphone",
       "size" : "29x29",
@@ -35,4 +45,4 @@
     "version" : 1,
     "author" : "xcode"
   }
-}
+}
\ No newline at end of file
diff --git a/Example/Optik/Images.xcassets/Contents.json b/Example/Optik/Images.xcassets/Contents.json
new file mode 100644
index 0000000..da4a164
--- /dev/null
+++ b/Example/Optik/Images.xcassets/Contents.json
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file
diff --git a/Example/Optik/Images.xcassets/heart-empty.imageset/Contents.json b/Example/Optik/Images.xcassets/heart-empty.imageset/Contents.json
new file mode 100644
index 0000000..16bd039
--- /dev/null
+++ b/Example/Optik/Images.xcassets/heart-empty.imageset/Contents.json
@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "heart.pdf"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file
diff --git a/Example/Optik/Images.xcassets/heart-empty.imageset/heart.pdf b/Example/Optik/Images.xcassets/heart-empty.imageset/heart.pdf
new file mode 100644
index 0000000000000000000000000000000000000000..0b103aa8781fbe3e57381351633ed09d948f0f27
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diff --git a/Example/Optik/Images.xcassets/heart-full.imageset/Contents.json b/Example/Optik/Images.xcassets/heart-full.imageset/Contents.json
new file mode 100644
index 0000000..7e5f41f
--- /dev/null
+++ b/Example/Optik/Images.xcassets/heart-full.imageset/Contents.json
@@ -0,0 +1,12 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "heart-fill.pdf"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file
diff --git a/Example/Optik/Images.xcassets/heart-full.imageset/heart-fill.pdf b/Example/Optik/Images.xcassets/heart-full.imageset/heart-fill.pdf
new file mode 100644
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literal 0
HcmV?d00001

diff --git a/Example/Optik/ViewController.swift b/Example/Optik/ViewController.swift
index db83faf..69e0d7d 100644
--- a/Example/Optik/ViewController.swift
+++ b/Example/Optik/ViewController.swift
@@ -82,4 +82,20 @@ extension ViewController: ImageViewerDelegate {
         currentLocalImageIndex = index
     }
     
+    func actionButtonTapped(button: UIButton, at index: Int) {
+        if  button.currentImage == UIImage(named: "heart-full")! {
+            button.setImage(UIImage(named: "heart-empty"), for: .normal)
+        } else {
+            button.setImage(UIImage(named: "heart-full"), for: .normal)
+        }
+    }
+    
+    func imageForActionButton (at index: Int) -> UIImage {
+        if index % 2 == 0 {
+            return UIImage(named: "heart-full")!
+        } else {
+            return UIImage(named: "heart-empty")!
+        }
+    }
+    
 }
diff --git a/Optik/Classes/ActionButtonPosition.swift b/Optik/Classes/ActionButtonPosition.swift
new file mode 100644
index 0000000..4f37fb1
--- /dev/null
+++ b/Optik/Classes/ActionButtonPosition.swift
@@ -0,0 +1,34 @@
+//
+//  ActionButtonPosition.swift
+//  Pods
+//
+//  Created by Rodrigo Leite on 28/11/16.
+//
+//
+
+import Foundation
+
+/**
+ Defines the position of the action button.
+ 
+ - topLeading:  action button is constrained to the top and leading anchors of its superview.
+ - topTrailing: action button is constrained to the top and trailing anchors of its superview.
+ */
+public enum ActionButtonPosition {
+    
+    case bottomLeading
+    
+    func xAnchorAttribute() -> NSLayoutAttribute {
+        switch self {
+        case .bottomLeading:
+            return .leading
+        }
+    }
+    
+    func yAnchorAttribute() -> NSLayoutAttribute {
+        switch self {
+        case .bottomLeading:
+            return .bottom
+        }
+    }
+}
diff --git a/Optik/Classes/AlbumViewController.swift b/Optik/Classes/AlbumViewController.swift
index 9d00651..d5b1911 100644
--- a/Optik/Classes/AlbumViewController.swift
+++ b/Optik/Classes/AlbumViewController.swift
@@ -63,7 +63,7 @@ internal final class AlbumViewController: UIViewController {
     private var activityIndicatorColor: UIColor?
     private var dismissButtonImage: UIImage?
     private var dismissButtonPosition: DismissButtonPosition
-    
+    private var actionButtonPosition: ActionButtonPosition
     private var cachedRemoteImages: [URL: UIImage] = [:]
     private var viewDidAppear: Bool = false
     
@@ -75,13 +75,15 @@ internal final class AlbumViewController: UIViewController {
          initialImageDisplayIndex: Int,
          activityIndicatorColor: UIColor?,
          dismissButtonImage: UIImage?,
-         dismissButtonPosition: DismissButtonPosition) {
+         dismissButtonPosition: DismissButtonPosition,
+         actionButtonPosition: ActionButtonPosition) {
         
         self.imageData = imageData
         self.initialImageDisplayIndex = initialImageDisplayIndex
         self.activityIndicatorColor = activityIndicatorColor
         self.dismissButtonImage = dismissButtonImage
         self.dismissButtonPosition = dismissButtonPosition
+        self.actionButtonPosition = actionButtonPosition
         
         pageViewController = UIPageViewController(transitionStyle: .scroll,
                                                   navigationOrientation: .horizontal,
@@ -115,6 +117,8 @@ internal final class AlbumViewController: UIViewController {
                 self.setNeedsStatusBarAppearanceUpdate()
             }) 
         }
+        updateActionButtonImage(at: initialImageDisplayIndex)
+
     }
     
     override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
@@ -226,13 +230,16 @@ internal final class AlbumViewController: UIViewController {
                 return nil
             }
             
-            return ImageViewController(image: images[index], index: index)
+            let imageViewController =  ImageViewController(image: images[index], index: index, actionButtonPosition: .bottomLeading)
+            imageViewController.actionButton?.addTarget(self, action: #selector(AlbumViewController.didSelectImage(_:)), for: .touchUpInside)
+            return imageViewController
+            
         case .remote(let urls, let imageDownloader):
             guard index >= 0 && index < urls.count else {
                 return nil
             }
             
-            let imageViewController = ImageViewController(activityIndicatorColor: activityIndicatorColor, index: index)
+            let imageViewController = ImageViewController(activityIndicatorColor: activityIndicatorColor, index: index, actionButtonPosition: actionButtonPosition)
             let url = urls[index]
             
             if let image = cachedRemoteImages[url] {
@@ -246,10 +253,20 @@ internal final class AlbumViewController: UIViewController {
                     })
             }
             
+            imageViewController.actionButton?.addTarget(self, action: #selector(AlbumViewController.didSelectImage(_:)), for: .touchUpInside)
             return imageViewController
         }
     }
     
+    fileprivate func updateActionButtonImage(at index: Int) {
+        if let imageViewController = pageViewController.viewControllers?.first as? ImageViewController{
+            let actionButton = imageViewController.actionButton
+            let image = imageViewerDelegate?.imageForActionButton(at: index)
+            actionButton?.setImage(image, for: .normal)
+        }
+    }
+
+    
     @objc private func didTapDismissButton(_ sender: UIButton) {
         dismiss(animated: true, completion: nil)
     }
@@ -258,6 +275,11 @@ internal final class AlbumViewController: UIViewController {
         transitionController.didPan(withGestureRecognizer: sender, sourceView: view)
     }
     
+    @objc private func didSelectImage(_ sender: UIButton) {
+        if let currentImageIndex = currentImageViewController?.index {
+            imageViewerDelegate?.actionButtonTapped(button: sender, at: currentImageIndex)
+        }
+    }
 }
 
 // MARK: - Protocol conformance
@@ -306,6 +328,8 @@ extension AlbumViewController: UIPageViewControllerDelegate {
         
         if let currentImageIndex = currentImageViewController?.index {
             imageViewerDelegate?.imageViewerDidDisplayImage(at: currentImageIndex)
+            self.updateActionButtonImage(at: currentImageIndex)
+
         }
     }
     
diff --git a/Optik/Classes/ImageViewController.swift b/Optik/Classes/ImageViewController.swift
index 681a0a4..2189cde 100644
--- a/Optik/Classes/ImageViewController.swift
+++ b/Optik/Classes/ImageViewController.swift
@@ -30,13 +30,15 @@ internal final class ImageViewController: UIViewController {
         }
     }
     private(set) var imageView: UIImageView?
-
+    var actionButton: UIButton?
+    
     let index: Int
     
     // MARK: - Private properties
     
     private var activityIndicatorColor: UIColor?
-    
+    private var actionButtonPosition: ActionButtonPosition?
+
     private var scrollView: UIScrollView? {
         didSet {
             guard let scrollView = scrollView else {
@@ -58,15 +60,17 @@ internal final class ImageViewController: UIViewController {
     }
     
     private var effectiveImageSize: CGSize?
-    
+
     // MARK: - Init/Deinit
     
-    init(image: UIImage? = nil, activityIndicatorColor: UIColor? = nil, index: Int) {
+    init(image: UIImage? = nil, activityIndicatorColor: UIColor? = nil, index: Int, actionButtonPosition: ActionButtonPosition) {
         self.image = image
         self.activityIndicatorColor = activityIndicatorColor
         self.index = index
-        
+        self.actionButtonPosition = actionButtonPosition
         super.init(nibName: nil, bundle: nil)
+        self.actionButton = UIButton()
+        
     }
     
     required init?(coder aDecoder: NSCoder) {
@@ -159,6 +163,57 @@ internal final class ImageViewController: UIViewController {
             self.activityIndicatorView = activityIndicatorView
         }
         
+        if let button = actionButton {
+            button.translatesAutoresizingMaskIntoConstraints = false
+            button.imageView?.contentMode = .scaleAspectFill
+            
+            let xAnchorAttribute = actionButtonPosition?.xAnchorAttribute()
+            let yAnchorAttribute = actionButtonPosition?.yAnchorAttribute()
+            
+            view.addSubview(button)
+            if let xAnchor = xAnchorAttribute,
+                let yAnchor = yAnchorAttribute {
+                
+                view.addConstraint(
+                    NSLayoutConstraint(item: button,
+                                       attribute: yAnchor,
+                                       relatedBy: .equal,
+                                       toItem: view,
+                                       attribute: yAnchor,
+                                       multiplier: 1,
+                                       constant: -20)
+                )
+                view.addConstraint(
+                    NSLayoutConstraint(item: button,
+                                       attribute: xAnchor,
+                                       relatedBy: .equal,
+                                       toItem: view,
+                                       attribute: xAnchor,
+                                       multiplier: 1,
+                                       constant: 20)
+                )
+                view.addConstraint(
+                    NSLayoutConstraint(item: button,
+                                       attribute: .width,
+                                       relatedBy: .equal,
+                                       toItem: nil,
+                                       attribute: .width,
+                                       multiplier: 1,
+                                       constant: 44)
+                )
+                view.addConstraint(
+                    NSLayoutConstraint(item: button,
+                                       attribute: .height,
+                                       relatedBy: .equal,
+                                       toItem: nil,
+                                       attribute: .height,
+                                       multiplier: 1,
+                                       constant: 44)
+                )
+            }
+            
+        }
+        
         setupTapGestureRecognizer()
     }
     
diff --git a/Optik/Classes/ImageViewerDelegate.swift b/Optik/Classes/ImageViewerDelegate.swift
index 831a532..8e78482 100644
--- a/Optik/Classes/ImageViewerDelegate.swift
+++ b/Optik/Classes/ImageViewerDelegate.swift
@@ -30,4 +30,20 @@ public protocol ImageViewerDelegate: class {
      */
     func imageViewerDidDisplayImage(at index: Int)
     
+    /**
+     Tells when the user touch in the action button
+     
+     - parameter index: Index of the image.
+     */
+    func actionButtonTapped(button: UIButton, at index: Int)
+    
+    
+    /**
+     Ask delegate for the image that should appear in the button when the image appears.
+     - parameter index: index of the image
+     
+     - return: UIImage
+     */
+    func imageForActionButton (at index: Int) -> UIImage
+    
 }
diff --git a/Optik/Classes/Optik.swift b/Optik/Classes/Optik.swift
index fc54d43..5ef5298 100644
--- a/Optik/Classes/Optik.swift
+++ b/Optik/Classes/Optik.swift
@@ -25,11 +25,13 @@ public func imageViewer(withImages images: [UIImage],
                                    initialImageDisplayIndex: Int = 0,
                                    delegate: ImageViewerDelegate? = nil,
                                    dismissButtonImage: UIImage? = nil,
-                                   dismissButtonPosition: DismissButtonPosition = .topLeading) -> UIViewController {
+                                   dismissButtonPosition: DismissButtonPosition = .topLeading,
+                                   actionButtonPosition: ActionButtonPosition = .bottomLeading) -> UIViewController {
     let albumViewController = imageViewer(withData: .local(images: images),
                                           initialImageDisplayIndex: initialImageDisplayIndex,
                                           dismissButtonImage: dismissButtonImage,
-                                          dismissButtonPosition: dismissButtonPosition)
+                                          dismissButtonPosition: dismissButtonPosition,
+                                          actionButtonPosition: actionButtonPosition)
     albumViewController.modalPresentationStyle = .custom
     albumViewController.imageViewerDelegate = delegate
     
@@ -53,12 +55,14 @@ public func imageViewer(withURLs urls: [URL],
                                  imageDownloader: ImageDownloader,
                                  activityIndicatorColor: UIColor = .white,
                                  dismissButtonImage: UIImage? = nil,
-                                 dismissButtonPosition: DismissButtonPosition = .topLeading) -> UIViewController {
+                                 dismissButtonPosition: DismissButtonPosition = .topLeading,
+                                 actionButtonPosition: ActionButtonPosition = .bottomLeading) -> UIViewController {
     return imageViewer(withData: .remote(urls: urls, imageDownloader: imageDownloader),
                        initialImageDisplayIndex: initialImageDisplayIndex,
                        activityIndicatorColor: activityIndicatorColor,
                        dismissButtonImage: dismissButtonImage,
-                       dismissButtonPosition: dismissButtonPosition)
+                       dismissButtonPosition: dismissButtonPosition,
+                       actionButtonPosition: actionButtonPosition)
 }
 
 // MARK: - Private functions
@@ -67,7 +71,8 @@ private func imageViewer(withData imageData: ImageData,
                                   initialImageDisplayIndex: Int,
                                   activityIndicatorColor: UIColor? = nil,
                                   dismissButtonImage: UIImage?,
-                                  dismissButtonPosition: DismissButtonPosition) -> AlbumViewController {
+                                  dismissButtonPosition: DismissButtonPosition,
+                                  actionButtonPosition: ActionButtonPosition = .bottomLeading) -> AlbumViewController {
     let bundle = Bundle(for: AlbumViewController.self)
     let defaultDismissButtonImage = UIImage(named: "DismissIcon", in: bundle, compatibleWith: nil)
     
@@ -75,5 +80,6 @@ private func imageViewer(withData imageData: ImageData,
                                initialImageDisplayIndex: initialImageDisplayIndex,
                                activityIndicatorColor: activityIndicatorColor,
                                dismissButtonImage: dismissButtonImage ?? defaultDismissButtonImage,
-                               dismissButtonPosition: dismissButtonPosition)
+                               dismissButtonPosition: dismissButtonPosition,
+                               actionButtonPosition: actionButtonPosition)
 }