diff --git a/.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata b/.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..919434a
--- /dev/null
+++ b/.swiftpm/xcode/package.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
diff --git a/Package.swift b/Package.swift
index a4435dc..089fee2 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,34 +1,15 @@
-//
-//  Package.swift
-//  FSPagerView
-//
-//  Created by Wenchao Ding on 22/02/2017.
-//  Copyright © 2017 Wenchao Ding. All rights reserved.
-//
-//  Permission is hereby granted, free of charge, to any person obtaining a copy
-//  of this software and associated documentation files (the "Software"), to deal
-//  in the Software without restriction, including without limitation the rights
-//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-//  copies of the Software, and to permit persons to whom the Software is
-//  furnished to do so, subject to the following conditions:
-//
-//  The above copyright notice and this permission notice shall be included in
-//  all copies or substantial portions of the Software.
-//
-//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-//  THE SOFTWARE.
-
-
 // swift-tools-version:5.0
 import PackageDescription
 
 let package = Package(
     name: "FSPagerView",
-    dependencies : [],
-    exclude: []
+    platforms: [
+        .iOS(.v9)
+    ],
+    products: [
+        .library(name: "FSPagerView", targets: ["FSPagerView"]),
+    ],
+    targets: [
+        .target(name: "FSPagerView", path: "Sources", exclude: ["FSPagerViewObjcCompat.h", "FSPagerViewObjcCompat.m"]),
+    ]
 )
diff --git a/README.md b/README.md
index dfaac64..c3ff8ec 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 ![fspagerview](https://cloud.githubusercontent.com/assets/5186464/24086370/45e7e8dc-0d49-11e7-86aa-139354fe00c5.jpg)
 
-[![Languages](https://img.shields.io/badge/language-swift%204.2%20|%20objc-FF69B4.svg?style=plastic)](#) <br/>
+[![Languages](https://img.shields.io/badge/language-swift%205.0%20|%20objc-FF69B4.svg?style=plastic)](#) <br/>
 [![Platform](https://img.shields.io/badge/platform-iOS%20|%20tvOS-blue.svg?style=plastic)](http://cocoadocs.org/docsets/FSPagerView)
 [![Version](https://img.shields.io/cocoapods/v/FSPagerView.svg?style=plastic)](http://cocoadocs.org/docsets/FSPagerView) 
 [![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=plastic)](https://github.com/Carthage/Carthage)
@@ -85,7 +85,7 @@ pagerView.interitemSpacing = 10
 | ![1](https://cloud.githubusercontent.com/assets/5186464/22686429/1983b97e-ed5f-11e6-9a32-44c1830df7ac.gif) |
 
 ```swift
-pagerView.transformer = FSPagerViewTransformer(type: .crossfading)
+pagerView.transformer = FSPagerViewTransformer(type: .crossFading)
 ```
 ---
 
@@ -96,7 +96,7 @@ pagerView.transformer = FSPagerViewTransformer(type: .crossfading)
 | ![2](https://cloud.githubusercontent.com/assets/5186464/22686426/19830862-ed5f-11e6-90be-8fb1319cd125.gif) |
 
 ```swift
-pagerView.transformer = FSPagerViewTransformer(type: .zoomout)
+pagerView.transformer = FSPagerViewTransformer(type: .zoomOut)
 ```
 ---
 
@@ -417,4 +417,4 @@ func pagerViewDidEndDecelerating(_ pagerView: FSPagerView)
 
 ---
 
-# [Documentation](http://cocoadocs.org/docsets/FSPagerView)
\ No newline at end of file
+# [Documentation](http://cocoadocs.org/docsets/FSPagerView)
diff --git a/Sources/FSPageViewTransformer.swift b/Sources/FSPageViewTransformer.swift
index 2878679..7f46771 100644
--- a/Sources/FSPageViewTransformer.swift
+++ b/Sources/FSPageViewTransformer.swift
@@ -26,8 +26,8 @@ open class FSPagerViewTransformer: NSObject {
     open internal(set) weak var pagerView: FSPagerView?
     open internal(set) var type: FSPagerViewTransformerType
     
-    open var minimumScale: CGFloat = 0.65
-    open var minimumAlpha: CGFloat = 0.6
+    @objc open var minimumScale: CGFloat = 0.65
+    @objc open var minimumAlpha: CGFloat = 0.6
     
     @objc
     public init(type: FSPagerViewTransformerType) {
diff --git a/Sources/FSPagerView.swift b/Sources/FSPagerView.swift
index 7fb17d9..dd54eba 100644
--- a/Sources/FSPagerView.swift
+++ b/Sources/FSPagerView.swift
@@ -512,7 +512,7 @@ open class FSPagerView: UIView,UICollectionViewDataSource,UICollectionViewDelega
     @objc(scrollToItemAtIndex:animated:)
     open func scrollToItem(at index: Int, animated: Bool) {
         guard index < self.numberOfItems else {
-            fatalError("index \(index) is out of range [0...\(self.numberOfItems-1)]")
+            return
         }
         let indexPath = { () -> IndexPath in
             if let indexPath = self.possibleTargetingIndexPath, indexPath.item == index {