added swift 5 support

Material.podspec

 Pod::Spec.new do |s|
 	s.name = 'Material'
-	s.version = '3.0.0'
-	s.swift_version = '4.2'
+	s.version = '3.1.0'
+	s.swift_version = '5.0'
 	s.license = 'BSD-3-Clause'
 	s.summary = 'A UI/UX framework for creating beautiful applications.'
 	s.homepage = 'http://cosmicmind.com'

Material.xcodeproj/project.pbxproj

@@ -931,7 +931,7 @@
 						CreatedOnToolsVersion = 6.4;
 						DevelopmentTeam = 9Z76XCNLGL;
 						DevelopmentTeamName = "CosmicMind Inc.";
-						LastSwiftMigration = 1000;
+						LastSwiftMigration = 1020;
 						ProvisioningStyle = Manual;
 					};
 				};
@@ -1245,7 +1245,7 @@
 				PROVISIONING_PROFILE = "";
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;
 		};
@@ -1270,7 +1270,7 @@
 				PROVISIONING_PROFILE = "";
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Release;
 		};

Motion @ 03a8f562

-Subproject commit 713926bca23ccfb6f68d2ffe525cdb91dc55ff44
+Subproject commit 03a8f562dd6850cf2ada59c49ec85c0f540ef9ee

Sources/Info.plist

@@ -15,7 +15,7 @@
 	<key>CFBundlePackageType</key>
 	<string>FMWK</string>
 	<key>CFBundleShortVersionString</key>
-	<string>3.0.0</string>
+	<string>3.1.0</string>
 	<key>CFBundleSignature</key>
 	<string>????</string>
 	<key>CFBundleVersion</key>

Sources/iOS/ButtonGroup/BaseButtonGroup.swift

@@ -80,7 +80,7 @@ open class BaseButtonGroup<T: Button>: View {
   @objc
   private func didTap(_ sender: Button) {
     guard let sender = sender as? T,
-      let index = buttons.index(of: sender)
+      let index = buttons.firstIndex(of: sender)
       else { return }
     
     didTap(button: sender, at: index)

Sources/iOS/ButtonGroup/CheckButtonGroup.swift

@@ -50,7 +50,7 @@ open class CheckButtonGroup: BaseButtonGroup<CheckButton> {
   /// Returns indexes of all selected check buttons within the group
   /// or empty array if none is seleceted.
   open var selectedIndices: [Int] {
-    return selecetedButtons.map { buttons.index(of: $0)! }
+    return selecetedButtons.map { buttons.firstIndex(of: $0)! }
   }
   
   open override func didTap(button: CheckButton, at index: Int) {

Sources/iOS/ButtonGroup/RadioButtonGroup.swift

@@ -51,7 +51,7 @@ open class RadioButtonGroup: BaseButtonGroup<RadioButton> {
   /// If none is selected (e.g in initial state), -1 is returned.
   open var selectedIndex: Int {
     guard let b = selectedButton else { return -1 }
-    return buttons.index(of: b)!
+    return buttons.firstIndex(of: b)!
   }
   
   open override func didTap(button: RadioButton, at index: Int) {

Sources/iOS/Navigation/NavigationController.swift

@@ -216,7 +216,7 @@ internal extension NavigationController {
    - Parameter from item: A UINavigationItem.
    */
   func removeBackButton(from item: UINavigationItem) {
-    if let index = item.leftViews.index(of: item.backButton) {
+    if let index = item.leftViews.firstIndex(of: item.backButton) {
       item.leftViews.remove(at: index)
     }
     

Sources/iOS/Tab/TabsController.swift

@@ -282,11 +282,11 @@ fileprivate extension TabsController {
    - Parameter completion: An optional completion block.
    */
   func transition(to viewController: UIViewController, isTriggeredByUserInteraction: Bool, completion: ((Bool) -> Void)?) {
-    guard let fvcIndex = viewControllers.index(of: rootViewController) else {
+    guard let fvcIndex = viewControllers.firstIndex(of: rootViewController) else {
       return
     }
     
-    guard let tvcIndex = viewControllers.index(of: viewController) else {
+    guard let tvcIndex = viewControllers.firstIndex(of: viewController) else {
       return
     }
     
@@ -536,7 +536,7 @@ extension TabsController {
 extension TabsController: _TabBarDelegate {
   @objc
   func _tabBar(tabBar: TabBar, shouldSelect tabItem: TabItem) -> Bool {
-    guard let i = tabBar.tabItems.index(of: tabItem) else {
+    guard let i = tabBar.tabItems.firstIndex(of: tabItem) else {
       return false
     }
     

Sources/iOS/Text/TextField.swift

@@ -766,7 +766,7 @@ private extension TextField {
   
   /// Remove view from rightView.
   func removeFromRightView(view: UIView?) {
-    guard let v = view, let i = rightView?.grid.views.index(of: v) else {
+    guard let v = view, let i = rightView?.grid.views.firstIndex(of: v) else {
       return
     }