Let CRIWVWebView inherit UIView instead of NSObject.

ios/web_view/internal/criwv_web_view_impl.mm

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#import "ios/web_view/internal/criwv_web_view_impl.h"
-
-#include <memory>
-#include <utility>
-
-#import "base/ios/weak_nsobject.h"
-#include "base/memory/ptr_util.h"
-#include "base/strings/sys_string_conversions.h"
-#include "ios/web/public/referrer.h"
-#import "ios/web/public/navigation_manager.h"
-#import "ios/web/public/web_state/ui/crw_web_delegate.h"
-#import "ios/web/public/web_state/web_state.h"
-#import "ios/web/public/web_state/web_state_delegate_bridge.h"
-#import "ios/web/public/web_state/web_state_observer_bridge.h"
-#include "ios/web_view/internal/criwv_browser_state.h"
-#import "ios/web_view/internal/translate/criwv_translate_client.h"
-#import "ios/web_view/public/criwv_web_view_delegate.h"
-#import "net/base/mac/url_conversions.h"
-#include "ui/base/page_transition_types.h"
-#include "url/gurl.h"
-
-@interface CRIWVWebViewImpl ()<CRWWebStateDelegate, CRWWebStateObserver> {
-  id<CRIWVWebViewDelegate> _delegate;
-  ios_web_view::CRIWVBrowserState* _browserState;
-  std::unique_ptr<web::WebState> _webState;
-  std::unique_ptr<web::WebStateDelegateBridge> _webStateDelegate;
-  std::unique_ptr<web::WebStateObserverBridge> _webStateObserver;
-  CGFloat _loadProgress;
-}
-
-@end
-
-@implementation CRIWVWebViewImpl
-
-@synthesize delegate = _delegate;
-@synthesize loadProgress = _loadProgress;
-
-- (instancetype)initWithBrowserState:
-    (ios_web_view::CRIWVBrowserState*)browserState {
-  self = [super init];
-  if (self) {
-    _browserState = browserState;
-
-    web::WebState::CreateParams webStateCreateParams(_browserState);
-    _webState = web::WebState::Create(webStateCreateParams);
-    _webState->SetWebUsageEnabled(true);
-
-    _webStateObserver =
-        base::MakeUnique<web::WebStateObserverBridge>(_webState.get(), self);
-    _webStateDelegate = base::MakeUnique<web::WebStateDelegateBridge>(self);
-    _webState->SetDelegate(_webStateDelegate.get());
-
-    // Initialize Translate.
-    ios_web_view::CRIWVTranslateClient::CreateForWebState(_webState.get());
-  }
-  return self;
-}
-
-- (UIView*)view {
-  return _webState->GetView();
-}
-
-- (BOOL)canGoBack {
-  return _webState && _webState->GetNavigationManager()->CanGoBack();
-}
-
-- (BOOL)canGoForward {
-  return _webState && _webState->GetNavigationManager()->CanGoForward();
-}
-
-- (BOOL)isLoading {
-  return _webState->IsLoading();
-}
-
-- (NSURL*)visibleURL {
-  return net::NSURLWithGURL(_webState->GetVisibleURL());
-}
-
-- (NSString*)pageTitle {
-  return base::SysUTF16ToNSString(_webState->GetTitle());
-}
-
-- (void)goBack {
-  if (_webState->GetNavigationManager())
-    _webState->GetNavigationManager()->GoBack();
-}
-
-- (void)goForward {
-  if (_webState->GetNavigationManager())
-    _webState->GetNavigationManager()->GoForward();
-}
-
-- (void)reload {
-  _webState->GetNavigationManager()->Reload(true);
-}
-
-- (void)stopLoading {
-  _webState->Stop();
-}
-
-- (void)loadURL:(NSURL*)URL {
-  web::NavigationManager::WebLoadParams params(net::GURLWithNSURL(URL));
-  params.transition_type = ui::PAGE_TRANSITION_TYPED;
-  _webState->GetNavigationManager()->LoadURLWithParams(params);
-}
-
-- (void)evaluateJavaScript:(NSString*)javaScriptString
-         completionHandler:(void (^)(id, NSError*))completionHandler {
-  [_webState->GetJSInjectionReceiver() executeJavaScript:javaScriptString
-                                       completionHandler:completionHandler];
-}
-
-- (void)setDelegate:(id<CRIWVWebViewDelegate>)delegate {
-  _delegate = delegate;
-
-  // Set up the translate delegate.
-  ios_web_view::CRIWVTranslateClient* translateClient =
-      ios_web_view::CRIWVTranslateClient::FromWebState(_webState.get());
-  id<CRIWVTranslateDelegate> translateDelegate = nil;
-  if ([_delegate respondsToSelector:@selector(translateDelegate)])
-    translateDelegate = [_delegate translateDelegate];
-  translateClient->set_translate_delegate(translateDelegate);
-}
-
-- (void)notifyDidUpdateWithChanges:(CRIWVWebViewUpdateType)changes {
-  SEL selector = @selector(webView:didUpdateWithChanges:);
-  if ([_delegate respondsToSelector:selector]) {
-    [_delegate webView:self didUpdateWithChanges:changes];
-  }
-}
-
-// -----------------------------------------------------------------------
-// WebStateObserver implementation.
-
-- (void)didStartProvisionalNavigationForURL:(const GURL&)URL {
-  [self notifyDidUpdateWithChanges:CRIWVWebViewUpdateTypeURL];
-}
-
-- (void)didCommitNavigationWithDetails:
-    (const web::LoadCommittedDetails&)details {
-  [self notifyDidUpdateWithChanges:CRIWVWebViewUpdateTypeURL];
-}
-
-- (void)webState:(web::WebState*)webState didLoadPageWithSuccess:(BOOL)success {
-  DCHECK_EQ(_webState.get(), webState);
-  SEL selector = @selector(webView:didFinishLoadingWithURL:loadSuccess:);
-  if ([_delegate respondsToSelector:selector]) {
-    [_delegate webView:self
-        didFinishLoadingWithURL:[self visibleURL]
-                    loadSuccess:success];
-  }
-}
-
-- (void)webState:(web::WebState*)webState
-    didChangeLoadingProgress:(double)progress {
-  [self notifyDidUpdateWithChanges:CRIWVWebViewUpdateTypeProgress];
-}
-
-@end