diff --git a/PhotoSliderDemo/ViewController.swift b/PhotoSliderDemo/ViewController.swift
index cccbf4b..98d9a78 100644
--- a/PhotoSliderDemo/ViewController.swift
+++ b/PhotoSliderDemo/ViewController.swift
@@ -74,9 +74,8 @@ class ViewController: UIViewController {
         }
 
         var width = view.bounds.width
-        if #available(iOS 11.0, *) {
-            width = view.bounds.width - view.safeAreaInsets.left - view.safeAreaInsets.right
-        }
+        width = view.bounds.width - view.safeAreaInsets.left - view.safeAreaInsets.right
+
         collectionView.contentOffset = CGPoint(x: CGFloat(currentRow) * width, y: 0.0)
     }
     
@@ -153,18 +152,10 @@ extension ViewController: UICollectionViewDelegateFlowLayout {
             
         } else {
             let height: CGFloat
-            if #available(iOS 11.0, *) {
-                height = view.safeAreaLayoutGuide.layoutFrame.height
-            } else {
-                height = view.bounds.height
-            }
-
+            height = view.safeAreaLayoutGuide.layoutFrame.height
             return CGSize(width: tableView.bounds.width, height: height)
-            
         }
-        
     }
-    
 }
 
 // MARK: - UITableViewDataSource
@@ -236,12 +227,11 @@ extension ViewController: ZoomingAnimationControllerTransitioning {
         var frame = cell.imageView.frame
         frame.origin.y += UIApplication.shared.statusBarFrame.height
         // tune in UIImageView
-        if #available(iOS 11.0, *) {
-            frame.origin.x = view.safeAreaInsets.left
-            if view.bounds.width > view.bounds.height {
-                frame.size.height = view.safeAreaLayoutGuide.layoutFrame.height
-            }
+        frame.origin.x = view.safeAreaInsets.left
+        if view.bounds.width > view.bounds.height {
+            frame.size.height = view.safeAreaLayoutGuide.layoutFrame.height
         }
+
         imageView.frame = frame
         imageView.clipsToBounds = true
         imageView.contentMode = .scaleAspectFill
@@ -274,32 +264,17 @@ extension ViewController: ZoomingAnimationControllerTransitioning {
         } else {
             let width: CGFloat
             let x: CGFloat
-            if #available(iOS 11.0, *) {
-                width = view.bounds.width - view.safeAreaInsets.left - view.safeAreaInsets.right
-                x = view.safeAreaInsets.left
-            } else {
-                width = view.bounds.width
-                x = 0
-            }
+            width = view.bounds.width - view.safeAreaInsets.left - view.safeAreaInsets.right
+            x = view.safeAreaInsets.left
 
             let height: CGFloat
-            if #available(iOS 11.0, *) {
-                height = view.safeAreaLayoutGuide.layoutFrame.height
-            } else {
-                height = (image.size.height * width) / image.size.width
-            }
+            height = view.safeAreaLayoutGuide.layoutFrame.height
 
             let y: CGFloat
-            if #available(iOS 11.0, *) {
-                y = (height - view.safeAreaLayoutGuide.layoutFrame.height - statusBarHeight) * 0.5
-            } else {
-                y = (height - UIScreen.main.bounds.height - statusBarHeight) * 0.5
-            }
-
+            y = (height - view.safeAreaLayoutGuide.layoutFrame.height - statusBarHeight) * 0.5
             frame = CGRect(x: x, y: -1.0 * y, width: width, height: height)
         }
         sourceImageView.frame = frame
-        
     }
 }
 
diff --git a/Sources/PhotoSlider/Classes/ImageView.swift b/Sources/PhotoSlider/Classes/ImageView.swift
index 355ee64..e26a40d 100644
--- a/Sources/PhotoSlider/Classes/ImageView.swift
+++ b/Sources/PhotoSlider/Classes/ImageView.swift
@@ -44,9 +44,8 @@ class ImageView: UIView {
         scrollView.maximumZoomScale = 3.0
         scrollView.delegate  = self
         scrollView.alwaysBounceVertical = true
-        if #available(iOS 11.0, *) {
-            scrollView.contentInsetAdjustmentBehavior = .never
-        }
+        scrollView.contentInsetAdjustmentBehavior = .never
+
         // image
         imageView = UIImageView(frame: CGRect.zero)
         imageView.contentMode = .scaleAspectFit
diff --git a/Sources/PhotoSlider/Classes/ViewController.swift b/Sources/PhotoSlider/Classes/ViewController.swift
index fa0e116..df5a4ae 100644
--- a/Sources/PhotoSlider/Classes/ViewController.swift
+++ b/Sources/PhotoSlider/Classes/ViewController.swift
@@ -41,10 +41,7 @@ public class ViewController: UIViewController {
             height: self.view.bounds.height * 3.0
         )
 
-        if #available(iOS 11.0, *) {
-            scrollView.contentInsetAdjustmentBehavior = .never
-        }
-
+        scrollView.contentInsetAdjustmentBehavior = .never
         return scrollView
     }()
 
@@ -64,7 +61,7 @@ public class ViewController: UIViewController {
         if let captionHeight = captionHeight {
             var y = view.bounds.height - captionHeight - 32.0
             var height = captionHeight + 32.0
-            if #available(iOS 11.0, *), let window = UIApplication.shared.keyWindow {
+            if let window = UIApplication.shared.keyWindow {
                 let bottomSafeInsetSpacing = window.safeAreaInsets.bottom
                 height += bottomSafeInsetSpacing
                 y -= bottomSafeInsetSpacing
@@ -309,61 +306,32 @@ fileprivate extension ViewController {
 
     func layoutCloseButton() {
         closeButton.translatesAutoresizingMaskIntoConstraints = false
-        if #available(iOS 11.0, *) {
-            [
-                closeButton.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 0.0),
-                closeButton.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: 0.0),
-                closeButton.heightAnchor.constraint(equalToConstant: 52.0),
-                closeButton.widthAnchor.constraint(equalToConstant: 52.0),
-                ].forEach { $0.isActive = true }
-        } else {
-            [
-                closeButton.topAnchor.constraint(equalTo: view.topAnchor, constant: 0.0),
-                closeButton.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0.0),
-                closeButton.heightAnchor.constraint(equalToConstant: 52.0),
-                closeButton.widthAnchor.constraint(equalToConstant: 52.0),
-                ].forEach { $0.isActive = true }
-
-        }
+        [
+            closeButton.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 0.0),
+            closeButton.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: 0.0),
+            closeButton.heightAnchor.constraint(equalToConstant: 52.0),
+            closeButton.widthAnchor.constraint(equalToConstant: 52.0),
+        ].forEach { $0.isActive = true }
     }
 
     func layoutShareButton() {
         shareButton.translatesAutoresizingMaskIntoConstraints = false
-        if #available(iOS 11.0, *) {
-            [
-                shareButton.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 0.0),
-                shareButton.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 0.0),
-                shareButton.heightAnchor.constraint(equalToConstant: 52.0),
-                shareButton.widthAnchor.constraint(equalToConstant: 52.0),
-                ].forEach { $0.isActive = true }
-        } else {
-            [
-                shareButton.topAnchor.constraint(equalTo: view.topAnchor, constant: 0.0),
-                shareButton.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 0.0),
-                shareButton.heightAnchor.constraint(equalToConstant: 52.0),
-                shareButton.widthAnchor.constraint(equalToConstant: 52.0),
-                ].forEach { $0.isActive = true }
-
-        }
+        [
+            shareButton.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor, constant: 0.0),
+            shareButton.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 0.0),
+            shareButton.heightAnchor.constraint(equalToConstant: 52.0),
+            shareButton.widthAnchor.constraint(equalToConstant: 52.0),
+        ].forEach { $0.isActive = true }
     }
-
+    
     func layoutPageControl() {
         pageControl.translatesAutoresizingMaskIntoConstraints = false
-        if #available(iOS 11.0, *) {
-            [
-                pageControl.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: 0.0),
-                pageControl.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor),
-                pageControl.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: 0.0),
-                pageControl.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 0.0),
-                ].forEach { $0.isActive = true }
-        } else {
-            [
-                pageControl.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 0.0),
-                pageControl.centerXAnchor.constraint(equalTo: view.centerXAnchor),
-                pageControl.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0.0),
-                pageControl.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 0.0),
-                ].forEach { $0.isActive = true }
-        }
+        [
+            pageControl.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: 0.0),
+            pageControl.centerXAnchor.constraint(equalTo: view.safeAreaLayoutGuide.centerXAnchor),
+            pageControl.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: 0.0),
+            pageControl.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 0.0),
+        ].forEach { $0.isActive = true }
     }
 
     func layoutCaptionLabel() {
@@ -379,19 +347,10 @@ fileprivate extension ViewController {
         }
 
         captionLabel.translatesAutoresizingMaskIntoConstraints = false
-        if #available(iOS 11.0, *) {
-            [
-                captionLabel.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -32.0),
-                captionLabel.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: -16.0),
-                captionLabel.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 16.0),
-                ].forEach { $0.isActive = true }
-        } else {
-            [
-                captionLabel.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -32.0),
-                captionLabel.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -16.0),
-                captionLabel.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 16.0),
-                ].forEach { $0.isActive = true }
-        }
+        [   captionLabel.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -32.0),
+            captionLabel.rightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.rightAnchor, constant: -16.0),
+            captionLabel.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuide.leftAnchor, constant: 16.0),
+        ].forEach { $0.isActive = true }
 
         if let captionHeight = captionHeight {
             captionLabel.heightAnchor.constraint(equalToConstant: captionHeight).isActive = true