Swift 4 update

.swift-version

@@ -0,0 +1 @@
+4.0

ElongationPreview.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name         = 'ElongationPreview'
-  s.version      = '1.0.5'
+  s.version      = '1.1.0'
   s.summary      = 'ElongationPreview is an elegant push-pop style view controller.'
   s.license      = 'MIT'
   s.homepage     = 'https://github.com/Ramotion/elongation-preview'

ElongationPreview.xcodeproj/project.pbxproj

@@ -539,7 +539,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.ramotion.ElongationPreviewUITests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				TEST_TARGET_NAME = ElongationPreviewDemo;
 			};
 			name = Debug;
@@ -553,7 +553,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.ramotion.ElongationPreviewUITests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 				TEST_TARGET_NAME = ElongationPreviewDemo;
 			};
 			name = Release;
@@ -611,6 +611,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -662,6 +663,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
@@ -687,7 +689,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -708,7 +710,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.ramotion.ElongationPreview;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};

ElongationPreview/Source/ViewControllers/ElongationDetailViewController.swift

@@ -71,7 +71,7 @@ open class ElongationDetailViewController: SwipableTableViewController {
 // MARK: - Actions ⚡
 extension ElongationDetailViewController {
 
-  func headerViewTapped(_ gesture: UITapGestureRecognizer) {
+  @objc func headerViewTapped(_ gesture: UITapGestureRecognizer) {
     let location = gesture.location(in: headerView)
     let point = headerView.convert(location, from: view)
     let action = ElongationConfig.shared.headerTouchAction

ElongationPreview/Source/ViewControllers/SwipableTableViewController.swift

@@ -29,7 +29,7 @@ open class SwipableTableViewController: UITableViewController, UIGestureRecogniz
     tableView.addGestureRecognizer(panGestureRecognizer)
   }
 
-  func gestureRecognizerSwiped(_ gesture: UIPanGestureRecognizer) { }
+  @objc func gestureRecognizerSwiped(_ gesture: UIPanGestureRecognizer) { }
 
   /// :nodoc:
   public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {

ElongationPreviewDemo/Helpers/LoremSwiftum.swift

@@ -167,8 +167,8 @@ private extension Array {
 private extension String {
 
     var stringWithCapitalizedFirstLetter: String {
-        let firstLetterRange = startIndex..<characters.index(after: startIndex)
-        let capitalizedFirstLetter = substring(with: firstLetterRange).capitalized
+        let firstLetterRange = startIndex..<index(after: startIndex)
+        let capitalizedFirstLetter = self[firstLetterRange].capitalized
         return replacingCharacters(in: firstLetterRange, with: capitalizedFirstLetter)
     }
 

README.md

@@ -28,7 +28,8 @@ The [iPhone mockup](https://store.ramotion.com?utm_source=gthb&utm_medium=specia
 
 - iOS 9.0+
 - Xcode 8
-- Swift 3
+- Swift 3 (<= 1.0.5)
+- Swift 4 (>= 1.1)
 
 <br>