diff --git a/Example/RMRPullToRefresh/ViewController.swift b/Example/RMRPullToRefresh/ViewController.swift
index 1432c01..29f6c63 100644
--- a/Example/RMRPullToRefresh/ViewController.swift
+++ b/Example/RMRPullToRefresh/ViewController.swift
@@ -46,7 +46,7 @@ class ViewController: UIViewController, UITableViewDataSource, UITableViewDelega
     
     func configurePullToRefresh() {
         
-        pullToRefresh = RMRPullToRefresh(scrollView: tableView, position: position()) { [weak self] _ in
+        pullToRefresh = RMRPullToRefresh(scrollView: tableView, position: position()) { [weak self] in
             DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + Double(Int64(5.0 * Double(NSEC_PER_SEC))) / Double(NSEC_PER_SEC), execute: {
                 if self?.result == .success {
                     self?.loadMore()
@@ -117,22 +117,24 @@ class ViewController: UIViewController, UITableViewDataSource, UITableViewDelega
     
     
     @IBAction func settings(_ sender: AnyObject) {
-        UIActionSheet(title: "Result type", delegate: self, cancelButtonTitle: nil, destructiveButtonTitle: nil, otherButtonTitles: ".Success", ".NoUpdates", ".Error").show(in: self.view)
-    }
-    
-    // MARK: - UIActionSheetDelegate
-    
-    func actionSheet(_ actionSheet: UIActionSheet, clickedButtonAt buttonIndex: Int) {
-        switch buttonIndex {
-        case 0:
-            self.result = .success
-        case 1:
+        let alertController = UIAlertController(title: "Result type", message: nil, preferredStyle: .actionSheet)
+        
+        let successAction = UIAlertAction(title: "Success", style: .default) { _ in
             self.result = .noUpdates
-        case 2:
-            self.result = .error
-        default:
-            break;
         }
+        alertController.addAction(successAction)
+        
+        let noUpdatesAction = UIAlertAction(title: "No updates", style: .default) { _ in
+            self.result = .noUpdates
+        }
+        alertController.addAction(noUpdatesAction)
+        
+        let errorAction = UIAlertAction(title: "Error", style: .default) { _ in
+            self.result = .error
+        }
+        alertController.addAction(errorAction)
+        
+        present(alertController, animated: true, completion: nil)
     }
     
     // MARK: - Test data
diff --git a/Example/RMRPullToRefreshExample.xcodeproj/project.pbxproj b/Example/RMRPullToRefreshExample.xcodeproj/project.pbxproj
index 677b94a..eab2cec 100644
--- a/Example/RMRPullToRefreshExample.xcodeproj/project.pbxproj
+++ b/Example/RMRPullToRefreshExample.xcodeproj/project.pbxproj
@@ -150,12 +150,12 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0720;
-				LastUpgradeCheck = 0720;
+				LastUpgradeCheck = 0920;
 				ORGANIZATIONNAME = "Merkulov Ilya";
 				TargetAttributes = {
 					89CB12331C9DA07B00048E46 = {
 						CreatedOnToolsVersion = 7.2.1;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 0920;
 					};
 				};
 			};
@@ -289,13 +289,21 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
@@ -333,13 +341,21 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
@@ -358,6 +374,7 @@
 				IPHONEOS_DEPLOYMENT_TARGET = 9.2;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
+				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;
@@ -372,7 +389,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.redmadrobot.RMRPullToRefresh;
 				PRODUCT_NAME = RMRPullToRefreshExample;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -386,7 +403,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.redmadrobot.RMRPullToRefresh;
 				PRODUCT_NAME = RMRPullToRefreshExample;
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};