add file open

Assets/3rd/DocumentHandler/Runtime/DocumentHandler.cs

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+using System;
+using System.Runtime.InteropServices;
+using UnityEngine;
+
+namespace drstc.DocumentHandler
+{
+    public class DocumentHandler : MonoBehaviour
+    {
+#if UNITY_IPHONE && !UNITY_EDITOR
+        [DllImport("__Internal")]
+        internal static extern bool _OpenDocument(string path);
+        
+        public static void OpenDocument(string path)
+        {
+            _OpenDocument(path);
+        }
+#else
+        public static void OpenDocument(string path)
+        {
+            Application.OpenURL("file:///" + path);
+        }
+#endif
+    }
+}

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Assets/3rd/DocumentHandler/Runtime/Drstc.DocumentHandler.Runtime.asmdef

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+{
+	"name": "Drstc.DocumentHandler.Runtime"
+}

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Assets/3rd/DocumentHandler/Runtime/Plugins/iOS/DocumentHandler.mm

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+ // Credits: https://answers.unity.com/questions/1337996/ios-open-docx-file-from-applicationpersistentdata.html
+ 
+ #import <Foundation/Foundation.h>
+ #import <UIKit/UIKit.h>
+ 
+ 
+ @interface DocumentHandler : NSObject <UIDocumentInteractionControllerDelegate>
+ {
+     NSURL * fileURL;
+ }
+ 
+ - (id)initWithURL:(NSURL*)unityURL;
+ 
+ - (void)UpdateURL:(NSURL*)unityURL;
+ 
+ - (bool)OpenDocument;
+ 
+ - (UIViewController *) documentInteractionControllerViewControllerForPreview: (UIDocumentInteractionController *) controller;
+ 
+ @end
+
+ 
+ @implementation DocumentHandler
+ 
+ - (id)initWithURL:(NSURL*)unityURL
+ {
+     self = [super init];
+     fileURL = unityURL;
+     return self;
+ }
+ 
+ - (void)UpdateURL:(NSURL*)unityURL {
+     fileURL = unityURL;
+ }
+ 
+ - (bool)OpenDocument {
+     
+     UIDocumentInteractionController *interactionController =
+     [UIDocumentInteractionController interactionControllerWithURL: fileURL];
+     
+     // Configure Document Interaction Controller
+     [interactionController setDelegate:self];
+     
+     [interactionController presentPreviewAnimated:YES];
+     
+     return true;
+ }
+ 
+ - (UIViewController *) documentInteractionControllerViewControllerForPreview: (UIDocumentInteractionController *) controller {
+     return UnityGetGLViewController();
+ }
+ 
+ @end
+ 
+ 
+ static DocumentHandler* docHandler = nil;
+ 
+ // Converts C style string to NSString
+ NSString* CreateNSString (const char* string)
+ {
+     if (string)
+         return [NSString stringWithUTF8String: string];
+     else
+         return [NSString stringWithUTF8String: ""];
+ }
+ 
+ 
+ extern "C" {
+     
+     bool _OpenDocument (const char* path)
+     {
+         // Convert path to URL
+         NSString * stringPath = CreateNSString(path);
+         
+         NSURL *unityURL = [NSURL fileURLWithPath:stringPath];
+         
+         if (docHandler == nil)
+             docHandler = [[DocumentHandler alloc] initWithURL:unityURL];
+         
+         else
+             [docHandler UpdateURL:unityURL];
+             
+         [docHandler OpenDocument];
+         
+         return true;
+     }
+ }

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