refactor(iOS): Migrate RCTOnPageSelected to swift

ios/Events/OnPageSelected.swift

@@ -0,0 +1,41 @@
+import Foundation
+import React
+
+@objc public class RCTOnPageSelected: NSObject, RCTEvent {
+    private var position: NSNumber
+    @objc public var viewTag: NSNumber
+    @objc public var coalescingKey: UInt16
+
+    @objc public var eventName: String {
+        return "onPageSelected"
+    }
+
+    @objc public init(reactTag: NSNumber, position: NSNumber, coalescingKey: UInt16) {
+        self.viewTag = reactTag
+        self.position = position
+        self.coalescingKey = coalescingKey
+        super.init()
+    }
+
+    @objc public func canCoalesce() -> Bool {
+        return false
+    }
+
+    public func coalesce(with newEvent: RCTEvent) ->  RCTEvent {
+        return newEvent
+    }
+
+    @objc public class func moduleDotMethod() -> String {
+        return "RCTEventEmitter.receiveEvent"
+    }
+
+    @objc public func arguments() -> [Any] {
+        return [
+            viewTag,
+            RCTNormalizeInputEventName(eventName) ?? eventName,
+            [
+                "position": position
+            ]
+        ]
+    }
+}

ios/RNCPagerView.m

@@ -4,7 +4,6 @@
 
 #import "UIViewController+CreateExtension.h"
 #import "RCTOnPageScrollStateChanged.h"
-#import "RCTOnPageSelected.h"
 #import <math.h>
 
 #if __has_include("react_native_pager_view/react_native_pager_view-Swift.h")

ios/react-native-pager-view-Bridging-Header.h

@@ -2,3 +2,4 @@
 #import <React/RCTUIManager.h>
 #import <React/UIView+React.h>
 #import <React/RCTUtils.h>
+#import <React/RCTAssert.h>