diff --git a/Example/NumberMorphView.xcodeproj/project.pbxproj b/Example/NumberMorphView.xcodeproj/project.pbxproj
index 4828dfb..ee44a6a 100644
--- a/Example/NumberMorphView.xcodeproj/project.pbxproj
+++ b/Example/NumberMorphView.xcodeproj/project.pbxproj
@@ -210,7 +210,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0720;
-				LastUpgradeCheck = 0820;
+				LastUpgradeCheck = 0900;
 				ORGANIZATIONNAME = CocoaPods;
 				TargetAttributes = {
 					607FACCF1AFB9204008FA782 = {
@@ -219,7 +219,7 @@
 					};
 					607FACE41AFB9204008FA782 = {
 						CreatedOnToolsVersion = 6.3.1;
-						LastSwiftMigration = 0820;
+						LastSwiftMigration = 0900;
 						TestTargetID = 607FACCF1AFB9204008FA782;
 					};
 				};
@@ -412,14 +412,20 @@
 				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;
@@ -459,14 +465,20 @@
 				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;
@@ -502,7 +514,7 @@
 				MODULE_NAME = ExampleApp;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.demo.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -517,7 +529,7 @@
 				MODULE_NAME = ExampleApp;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.demo.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -535,7 +547,8 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/NumberMorphView_Example.app/NumberMorphView_Example";
 			};
 			name = Debug;
@@ -550,7 +563,8 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/NumberMorphView_Example.app/NumberMorphView_Example";
 			};
 			name = Release;
diff --git a/Example/NumberMorphView.xcodeproj/xcshareddata/xcschemes/NumberMorphView-Example.xcscheme b/Example/NumberMorphView.xcodeproj/xcshareddata/xcschemes/NumberMorphView-Example.xcscheme
index 34e410e..cc93a39 100644
--- a/Example/NumberMorphView.xcodeproj/xcshareddata/xcschemes/NumberMorphView-Example.xcscheme
+++ b/Example/NumberMorphView.xcodeproj/xcshareddata/xcschemes/NumberMorphView-Example.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0820"
+   LastUpgradeVersion = "0900"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -40,6 +40,7 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
          <TestableReference
@@ -69,6 +70,7 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
diff --git a/Example/NumberMorphView/ViewController.swift b/Example/NumberMorphView/ViewController.swift
index db9cecd..f5d8ab2 100644
--- a/Example/NumberMorphView/ViewController.swift
+++ b/Example/NumberMorphView/ViewController.swift
@@ -43,7 +43,7 @@ class ViewController: UIViewController {
         n6.interpolator = NumberMorphView.CubicHermiteInterpolator();
     }
     
-    func updateTime() {
+    @objc func updateTime() {
         let date = Date();
         let components = Calendar(identifier: .gregorian).dateComponents([.hour, .minute, .second], from: date);
         var hour = components.hour ?? 0;
diff --git a/Example/Pods/Pods.xcodeproj/project.pbxproj b/Example/Pods/Pods.xcodeproj/project.pbxproj
index 1aebe96..d71ea80 100644
--- a/Example/Pods/Pods.xcodeproj/project.pbxproj
+++ b/Example/Pods/Pods.xcodeproj/project.pbxproj
@@ -355,7 +355,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0700;
-				LastUpgradeCheck = 0720;
+				LastUpgradeCheck = 0900;
 				TargetAttributes = {
 					9047E4B43A94C65118ABEB243B060B49 = {
 						LastSwiftMigration = 0820;
@@ -364,7 +364,7 @@
 						LastSwiftMigration = 0820;
 					};
 					E3DADACCC51A5DD9350C9D33F6FC9926 = {
-						LastSwiftMigration = 0820;
+						LastSwiftMigration = 0900;
 					};
 					FE55E2311679F0F278F81FEEC328D150 = {
 						LastSwiftMigration = 0820;
@@ -470,7 +470,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 7D921FF47FF95F188BBCC3E4C9C382EE /* Pods-NumberMorphView_Tests.release.xcconfig */;
 			buildSettings = {
-				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
 				CURRENT_PROJECT_VERSION = 1;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
@@ -506,18 +507,28 @@
 				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;
 				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;
+				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;
 				COPY_PHASE_STRIP = YES;
 				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_PREPROCESSOR_DEFINITIONS = "RELEASE=1";
 				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
@@ -527,6 +538,7 @@
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				IPHONEOS_DEPLOYMENT_TARGET = 8.3;
 				STRIP_INSTALLED_PRODUCT = NO;
+				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				SYMROOT = "${SRCROOT}/../build";
 				VALIDATE_PRODUCT = YES;
 			};
@@ -536,7 +548,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = EB93344F980B6AE510DE89130598EEC8 /* Pods-NumberMorphView_Example.release.xcconfig */;
 			buildSettings = {
-				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
 				CURRENT_PROJECT_VERSION = 1;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
@@ -568,7 +581,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 3BEE090A5943111ADB06920EE0A054ED /* NumberMorphView.xcconfig */;
 			buildSettings = {
-				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
 				CURRENT_PROJECT_VERSION = 1;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
@@ -586,7 +599,8 @@
 				PRODUCT_NAME = NumberMorphView;
 				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -601,19 +615,29 @@
 				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;
 				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;
+				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;
 				COPY_PHASE_STRIP = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
 				GCC_OPTIMIZATION_LEVEL = 0;
 				GCC_PREPROCESSOR_DEFINITIONS = (
 					"DEBUG=1",
@@ -637,7 +661,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 34889A6220F5A0AB4E1FCA1464CE2FCF /* Pods-NumberMorphView_Tests.debug.xcconfig */;
 			buildSettings = {
-				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
 				CURRENT_PROJECT_VERSION = 1;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
@@ -670,7 +695,8 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = F802B58E1C027CA5E8F672D16408C632 /* Pods-NumberMorphView_Example.debug.xcconfig */;
 			buildSettings = {
-				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
 				CURRENT_PROJECT_VERSION = 1;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
@@ -717,7 +743,7 @@
 			isa = XCBuildConfiguration;
 			baseConfigurationReference = 3BEE090A5943111ADB06920EE0A054ED /* NumberMorphView.xcconfig */;
 			buildSettings = {
-				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
 				CURRENT_PROJECT_VERSION = 1;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
@@ -736,7 +762,8 @@
 				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
diff --git a/Example/Pods/Pods.xcodeproj/xcshareddata/xcschemes/NumberMorphView.xcscheme b/Example/Pods/Pods.xcodeproj/xcshareddata/xcschemes/NumberMorphView.xcscheme
index 9013a92..3b729df 100644
--- a/Example/Pods/Pods.xcodeproj/xcshareddata/xcschemes/NumberMorphView.xcscheme
+++ b/Example/Pods/Pods.xcodeproj/xcshareddata/xcschemes/NumberMorphView.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0820"
+   LastUpgradeVersion = "0900"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -26,6 +26,7 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
       </Testables>
@@ -36,6 +37,7 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
diff --git a/Pod/Classes/NumberMorphView.swift b/Pod/Classes/NumberMorphView.swift
index bf097bb..1d47f85 100755
--- a/Pod/Classes/NumberMorphView.swift
+++ b/Pod/Classes/NumberMorphView.swift
@@ -187,7 +187,7 @@ public protocol InterpolatorProtocol {
         shapeLayer.path = path.cgPath;
     }
     
-    func updateAnimationFrame() {
+    @objc func updateAnimationFrame() {
         if maxFrames <= 0 {
             if let displayLink = displayLink {
                 maxFrames = Int(animationDuration / displayLink.duration);