Added goBack and goForward methods

Author: maciej-rosiek

AQWebView/AQWebView.h

@@ -10,7 +10,5 @@
 - (void)reload;
 - (void)goBack;
 - (void)goForward;
-- (BOOL)canGoBack;
-- (BOOL)canGoForward;
 
 @end

AQWebView/AQWebView.m

@@ -16,60 +16,60 @@ @interface AQWebView () <RCTAutoInsetsProtocol, WKNavigationDelegate>
 
 @implementation AQWebView
 {
-  WKWebView *_webView;
-  UIActivityIndicatorView *_spinner;
-  UIRefreshControl *_refreshControl;
+    WKWebView *_webView;
+    UIActivityIndicatorView *_spinner;
+    UIRefreshControl *_refreshControl;
 }
 
 - (instancetype)initWithFrame:(CGRect)frame
 {
-  if ((self = [super initWithFrame:frame])) {
-    super.backgroundColor = [UIColor clearColor];
-    _automaticallyAdjustContentInsets = YES;
-    _contentInset = UIEdgeInsetsZero;
-
-    _webView = [[WKWebView alloc] initWithFrame:self.bounds];
-    _webView.allowsBackForwardNavigationGestures = YES;
-    
-    // Disabled because it feels less like an app if you can preview links
-    //_webView.allowsLinkPreview = YES;
-    
-    _webView.navigationDelegate = self;
-    [self addSubview:_webView];
-
-    _spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
-    [_spinner setTranslatesAutoresizingMaskIntoConstraints:NO];
-    [_spinner startAnimating];
-    [_webView addSubview:_spinner];
-
-    /*
-    _refreshControl = [[UIRefreshControl alloc] init];
-    [_webView.scrollView addSubview:_refreshControl];
-    [_refreshControl addTarget:self action:@selector(reload) forControlEvents:UIControlEventValueChanged];
-     */
-
-    [_webView addConstraint:[NSLayoutConstraint constraintWithItem:_spinner
-                                                         attribute:NSLayoutAttributeCenterX
-                                                         relatedBy:NSLayoutRelationEqual
-                                                            toItem:_webView
-                                                         attribute:NSLayoutAttributeCenterX
-                                                        multiplier:1
-                                                          constant:0]];
-
-    [_webView addConstraint:[NSLayoutConstraint constraintWithItem:_spinner
-                                                         attribute:NSLayoutAttributeCenterY
-                                                         relatedBy:NSLayoutRelationEqual
-                                                            toItem:_webView
-                                                         attribute:NSLayoutAttributeCenterY
-                                                        multiplier:1
-                                                          constant:0]];
-  }
-  return self;
+    if ((self = [super initWithFrame:frame])) {
+        super.backgroundColor = [UIColor clearColor];
+        _automaticallyAdjustContentInsets = YES;
+        _contentInset = UIEdgeInsetsZero;
+        
+        _webView = [[WKWebView alloc] initWithFrame:self.bounds];
+        _webView.allowsBackForwardNavigationGestures = YES;
+        
+        // Disabled because it feels less like an app if you can preview links
+        //_webView.allowsLinkPreview = YES;
+        
+        _webView.navigationDelegate = self;
+        [self addSubview:_webView];
+        
+        _spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
+        [_spinner setTranslatesAutoresizingMaskIntoConstraints:NO];
+        [_spinner startAnimating];
+        [_webView addSubview:_spinner];
+        
+        /*
+         _refreshControl = [[UIRefreshControl alloc] init];
+         [_webView.scrollView addSubview:_refreshControl];
+         [_refreshControl addTarget:self action:@selector(reload) forControlEvents:UIControlEventValueChanged];
+         */
+        
+        [_webView addConstraint:[NSLayoutConstraint constraintWithItem:_spinner
+                                                             attribute:NSLayoutAttributeCenterX
+                                                             relatedBy:NSLayoutRelationEqual
+                                                                toItem:_webView
+                                                             attribute:NSLayoutAttributeCenterX
+                                                            multiplier:1
+                                                              constant:0]];
+        
+        [_webView addConstraint:[NSLayoutConstraint constraintWithItem:_spinner
+                                                             attribute:NSLayoutAttributeCenterY
+                                                             relatedBy:NSLayoutRelationEqual
+                                                                toItem:_webView
+                                                             attribute:NSLayoutAttributeCenterY
+                                                            multiplier:1
+                                                              constant:0]];
+    }
+    return self;
 }
 
 - (void)reload
 {
-  [_webView loadRequest:[NSURLRequest requestWithURL:_webView.URL]];
+    [_webView loadRequest:[NSURLRequest requestWithURL:_webView.URL]];
 }
 
 - (void)goBack
@@ -82,162 +82,152 @@ - (void)goForward
     [_webView goForward];
 }
 
-- (BOOL)canGoBack
-{
-    return _webView.canGoBack;
-}
-
-- (BOOL)canGoForward
-{
-    return _webView.canGoForward;
-}
-
 - (void)setSource:(NSDictionary *)source
 {
-  if (![_source isEqualToDictionary:source]) {
-    _source = [source copy];
-    
-    // Check for a static html source first
-    NSString *html = [RCTConvert NSString:source[@"html"]];
-    if (html) {
-      NSURL *baseURL = [RCTConvert NSURL:source[@"baseUrl"]];
-      _userLoadedUrl = [baseURL absoluteString];
-      [_webView loadHTMLString:html baseURL:baseURL];
-      return;
-    }
-    
-    NSURLRequest *request = [RCTConvert NSURLRequest:source];
-    // Because of the way React works, as pages redirect, we actually end up
-    // passing the redirect urls back here, so we ignore them if trying to load
-    // the same url. We'll expose a call to 'reload' to allow a user to load
-    // the existing page.
-    if ([request.URL isEqual:_webView.URL]) {
-      return;
-    }
-    if (!request.URL) {
-      // Clear the webview
-      [_webView loadHTMLString:@"" baseURL:nil];
-      return;
+    if (![_source isEqualToDictionary:source]) {
+        _source = [source copy];
+        
+        // Check for a static html source first
+        NSString *html = [RCTConvert NSString:source[@"html"]];
+        if (html) {
+            NSURL *baseURL = [RCTConvert NSURL:source[@"baseUrl"]];
+            _userLoadedUrl = [baseURL absoluteString];
+            [_webView loadHTMLString:html baseURL:baseURL];
+            return;
+        }
+        
+        NSURLRequest *request = [RCTConvert NSURLRequest:source];
+        // Because of the way React works, as pages redirect, we actually end up
+        // passing the redirect urls back here, so we ignore them if trying to load
+        // the same url. We'll expose a call to 'reload' to allow a user to load
+        // the existing page.
+        if ([request.URL isEqual:_webView.URL]) {
+            return;
+        }
+        if (!request.URL) {
+            // Clear the webview
+            [_webView loadHTMLString:@"" baseURL:nil];
+            return;
+        }
+        _userLoadedUrl = [request.URL absoluteString];
+        [_webView loadRequest:request];
     }
-    _userLoadedUrl = [request.URL absoluteString];
-    [_webView loadRequest:request];
-  }
 }
 
 - (void)layoutSubviews
 {
-  [super layoutSubviews];
-  _webView.frame = self.bounds;
+    [super layoutSubviews];
+    _webView.frame = self.bounds;
 }
 
 - (void)setContentInset:(UIEdgeInsets)contentInset
 {
-  _contentInset = contentInset;
-  [RCTView autoAdjustInsetsForView:self
-                    withScrollView:_webView.scrollView
-                      updateOffset:NO];
+    _contentInset = contentInset;
+    [RCTView autoAdjustInsetsForView:self
+                      withScrollView:_webView.scrollView
+                        updateOffset:NO];
 }
 
 - (void)setBackgroundColor:(UIColor *)backgroundColor
 {
-  CGFloat alpha = CGColorGetAlpha(backgroundColor.CGColor);
-  self.opaque = _webView.opaque = (alpha == 1.0);
-  _webView.backgroundColor = backgroundColor;
+    CGFloat alpha = CGColorGetAlpha(backgroundColor.CGColor);
+    self.opaque = _webView.opaque = (alpha == 1.0);
+    _webView.backgroundColor = backgroundColor;
 }
 
 - (UIColor *)backgroundColor
 {
-  return _webView.backgroundColor;
+    return _webView.backgroundColor;
 }
 
 - (void)refreshContentInset
 {
-  [RCTView autoAdjustInsetsForView:self
-                    withScrollView:_webView.scrollView
-                      updateOffset:YES];
+    [RCTView autoAdjustInsetsForView:self
+                      withScrollView:_webView.scrollView
+                        updateOffset:YES];
 }
 
 - (NSMutableDictionary<NSString *, id> *)baseEvent
 {
-  NSMutableDictionary<NSString *, id> *event = [[NSMutableDictionary alloc] initWithDictionary:
-    @{
-      @"url": [_webView.URL absoluteString] ?: @"",
-      @"loading" : @(_webView.loading),
-      @"title": [_webView title] ?: @"",
-      @"canGoBack": @(_webView.canGoBack),
-      @"canGoForward" : @(_webView.canGoForward),
-    }
-  ];
-  
-  return event;
+    NSMutableDictionary<NSString *, id> *event = [[NSMutableDictionary alloc] initWithDictionary:
+                                                  @{
+                                                    @"url": [_webView.URL absoluteString] ?: @"",
+                                                    @"loading" : @(_webView.loading),
+                                                    @"title": [_webView title] ?: @"",
+                                                    @"canGoBack": @(_webView.canGoBack),
+                                                    @"canGoForward" : @(_webView.canGoForward),
+                                                    }
+                                                  ];
+    
+    return event;
 }
 
 #pragma mark - WKNavigationDelegate
 
 - (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler
 {
-  NSURL *url = navigationAction.request.URL;
-  NSString *urlStr = [url absoluteString];
-  BOOL block = false;
-
-  if ([urlStr isEqual: @""]) {
-    urlStr = @"about:blank";
-  }
-
-  if (![urlStr isEqual: _userLoadedUrl]) {
-    for (id prefix in _blockedPrefixes) {
-      if ([urlStr hasPrefix:prefix]) {
-        NSMutableDictionary<NSString *, id> *event = [[NSMutableDictionary alloc] initWithDictionary:
-                                                      @{
-                                                        @"url": urlStr,
-                                                        }
-                                                      ];
-        _onPrefixBlocked(event);
-        decisionHandler(WKNavigationActionPolicyCancel);
-        block = true;
-        break;
-      }
+    NSURL *url = navigationAction.request.URL;
+    NSString *urlStr = [url absoluteString];
+    BOOL block = false;
+    
+    if ([urlStr isEqual: @""]) {
+        urlStr = @"about:blank";
+    }
+    
+    if (![urlStr isEqual: _userLoadedUrl]) {
+        for (id prefix in _blockedPrefixes) {
+            if ([urlStr hasPrefix:prefix]) {
+                NSMutableDictionary<NSString *, id> *event = [[NSMutableDictionary alloc] initWithDictionary:
+                                                              @{
+                                                                @"url": urlStr,
+                                                                }
+                                                              ];
+                _onPrefixBlocked(event);
+                decisionHandler(WKNavigationActionPolicyCancel);
+                block = true;
+                break;
+            }
+        }
+    }
+    
+    if (!block) {
+        decisionHandler(WKNavigationActionPolicyAllow);
     }
-  }
-
-  if (!block) {
-    decisionHandler(WKNavigationActionPolicyAllow);
-  }
 }
 
 -(void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation
 {
-  [_spinner stopAnimating];
-  [_refreshControl endRefreshing];
-
-  if (_onLoadingFinish) {
-    NSMutableDictionary<NSString *, id> *event = [self baseEvent];
-    _onLoadingFinish(event);
-  }
+    [_spinner stopAnimating];
+    [_refreshControl endRefreshing];
+    
+    if (_onLoadingFinish) {
+        NSMutableDictionary<NSString *, id> *event = [self baseEvent];
+        _onLoadingFinish(event);
+    }
 }
 
 - (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation
 {
-  if (_onLoadingStart) {
-    NSMutableDictionary<NSString *, id> *event = [self baseEvent];
-    _onLoadingStart(event);
-  }
+    if (_onLoadingStart) {
+        NSMutableDictionary<NSString *, id> *event = [self baseEvent];
+        _onLoadingStart(event);
+    }
 }
 
 -(void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(nonnull NSError *)error
 {
-  [_spinner stopAnimating];
-  [_refreshControl endRefreshing];
-
-  if (_onLoadingError) {
-    NSMutableDictionary<NSString *, id> *event = [self baseEvent];
-    [event addEntriesFromDictionary:@{
-                                      @"domain": error.domain,
-                                      @"code": @(error.code),
-                                      @"description": error.localizedDescription,
-                                    }];
-    _onLoadingError(event);
-  }
+    [_spinner stopAnimating];
+    [_refreshControl endRefreshing];
+    
+    if (_onLoadingError) {
+        NSMutableDictionary<NSString *, id> *event = [self baseEvent];
+        [event addEntriesFromDictionary:@{
+                                          @"domain": error.domain,
+                                          @"code": @(error.code),
+                                          @"description": error.localizedDescription,
+                                          }];
+        _onLoadingError(event);
+    }
 }
 
 @end