feat: support async navigation decision handling

Author: kbulgakov-exo

apple/RNCWebView.h

@@ -19,14 +19,6 @@ typedef enum RNCWebViewPermissionGrantType : NSUInteger {
 
 @class RNCWebView;
 
-@protocol RNCWebViewDelegate <NSObject>
-
-- (BOOL)webView:(RNCWebView *_Nonnull)webView
-shouldStartLoadForRequest:(NSMutableDictionary<NSString *, id> *_Nonnull)request
-   withCallback:(RCTDirectEventBlock _Nonnull)callback;
-
-@end
-
 @interface RNCWeakScriptMessageDelegate : NSObject<WKScriptMessageHandler>
 
 @property (nonatomic, weak, nullable) id<WKScriptMessageHandler> scriptDelegate;
@@ -37,7 +29,6 @@ shouldStartLoadForRequest:(NSMutableDictionary<NSString *, id> *_Nonnull)request
 
 @interface RNCWebView : RCTView
 
-@property (nonatomic, weak) id<RNCWebViewDelegate> _Nullable delegate;
 @property (nonatomic, copy) NSDictionary * _Nullable source;
 @property (nonatomic, assign) BOOL messagingEnabled;
 @property (nonatomic, copy) NSString * _Nullable injectedJavaScript;

apple/RNCWebView.m

@@ -9,6 +9,7 @@
 #import <React/RCTConvert.h>
 #import <React/RCTAutoInsetsProtocol.h>
 #import "RNCWKProcessPoolManager.h"
+#import "RNCWebViewDecisionManager.h"
 #if !TARGET_OS_OSX
 #import <UIKit/UIKit.h>
 #else
@@ -1122,6 +1123,16 @@ - (void)                  webView:(WKWebView *)webView
   };
 
   if (_onShouldStartLoadWithRequest) {
+    int lockIdentifier = [[RNCWebViewDecisionManager getInstance] setDecisionHandler:^(BOOL shouldStart) {
+      dispatch_async(dispatch_get_main_queue(), ^{
+        if (!shouldStart) {
+          decisionHandler(WKNavigationActionPolicyCancel);
+          return;
+        }
+        allowNavigation();
+      });
+    }];
+
     NSMutableDictionary<NSString *, id> *event = [self baseEvent];
     if (request.mainDocumentURL) {
       [event addEntriesFromDictionary: @{
@@ -1131,14 +1142,11 @@ - (void)                  webView:(WKWebView *)webView
     [event addEntriesFromDictionary: @{
       @"url": (request.URL).absoluteString,
       @"navigationType": navigationTypes[@(navigationType)],
-      @"isTopFrame": @(isTopFrame)
+      @"isTopFrame": @(isTopFrame),
+      @"lockIdentifier": @(lockIdentifier)
     }];
-    if (![self.delegate webView:self
-      shouldStartLoadForRequest:event
-                   withCallback:_onShouldStartLoadWithRequest]) {
-      decisionHandler(WKNavigationActionPolicyCancel);
-      return;
-    }
+    _onShouldStartLoadWithRequest(event);
+    return;
   }
 
   // Allow all navigation by default