Merge pull request TimOliver#29 from VladimirGoncharov/master

Added an optional request checking handler block.

Author: TimOliver

TOWebViewController/TOWebViewController.h

@@ -126,6 +126,11 @@
  */
 @property (nonatomic,copy)      void (^modalCompletionHandler)(void);
 
+/**
+ Managing queries and navigation
+ */
+@property (nonatomic,copy)      BOOL (^shouldStartLoadRequestHandler)(NSURLRequest *request, UIWebViewNavigationType navigationType);
+
 /** 
  On iOS 6 or below, this can be used to override the default fill color of the navigation button icons.
  

TOWebViewController/TOWebViewController.m

@@ -692,10 +692,15 @@ - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)
 {
     BOOL shouldStart = YES;
 
+    if (self.shouldStartLoadRequestHandler)
+    {
+        shouldStart     = self.shouldStartLoadRequestHandler(request, navigationType);
+    }
+    
     //TODO: Implement TOModalWebViewController Delegate callback
 
     //if the URL is the load completed notification from JavaScript
-    if ([request.URL.absoluteString isEqualToString:kCompleteRPCURL])
+    if ([request.URL.absoluteString isEqualToString:kCompleteRPCURL] || !shouldStart)
     {
         [self finishLoadProgress];
         return NO;