UIWebview enhancement hacks

uiwebview-tweaks.m

// Continuously changing GIST of UIWebView 'tweaks' I use. Might be useful to others,
// hope Google finds this. Some of these already passed Review, but one never knows ;).
// Happy coding!

- (void)ScrollView_setContentOffset:(CGPoint)offset {
	// Prevent superfluous scrolling animations (eg when toggling keyboard) by completely disabling scrolling. We achieve scrolling through inner scroll views (overflowing html elements).
}

- (id)WebBrowserView_inputAccessoryView {
	// Make the keyboard accessory view (next/prev,submit buttons) optional, it really takes up to much screen estate in a normal app.
	if (keybAccessory)
		return [super inputAccessoryView];
	else
		return nil;
}

- (void)WebView_webView:(id)arg1 decidePolicyForGeolocationRequestFromOrigin:(id)arg2 frame:(id)arg3 listener:(id)arg4 {
	// When using the HTML5 location API, UIWebViews's default implementation triggers an additional "file://longUrl Wants To Access Your Location" modal, directly after the App asks for permission.
    
    SEL selector = NSSelectorFromString(@"allow");
    if([arg4 respondsToSelector:selector]) {
        ((void (*)(id,SEL))[arg4 methodForSelector:selector])(arg4,selector);
			// just invoking the selector..
        NSLog(@"allowed geolocation request");
    }
}


- (void) tweakWebView {
    
    Class WebView = objc_allocateClassPair(objc_getClass("UIWebView"), "MyWebView", 0);
    class_addMethod(WebView,
		@selector(webView:decidePolicyForGeolocationRequestFromOrigin:frame:listener:),
		[self methodForSelector: @selector(WebView_webView:decidePolicyForGeolocationRequestFromOrigin:frame:listener:)],
		"v@:");
    objc_registerClassPair(WebView);
    object_setClass(web, WebView);

	Class ScrollView = objc_allocateClassPair(objc_getClass("UIScrollView"), "MyScrollView", 0);
	class_addMethod(ScrollView, @selector(setContentOffset:),
			[self methodForSelector:@selector(ScrollView_setContentOffset:)], "@@:");
	objc_registerClassPair(ScrollView);
	object_setClass(web.scrollView, ScrollView);

	Class WebBrowserView = objc_allocateClassPair(objc_getClass("UIWebBrowserView"), "MyWebBrowserView", 0);
	class_addMethod(WebBrowserView, @selector(inputAccessoryView),
		[self methodForSelector:@selector(WebBrowserView_inputAccessoryView)], "v@:");
	objc_registerClassPair(WebBrowserView);

	for (UIView *subview in web.scrollView.subviews) {
		if ([NSStringFromClass([subview class]) isEqualToString:@"UIWebBrowserView"]) {
			object_setClass(subview, WebBrowserView);
			break;
		}
	}
}