I have an UIView that in front of a bigger UIView, I want to hide that current View when tap on the behind View but I can't get Touch Up Outside event work, Touch Up Inside that View work fine.
(The behind View have another controls)
Thanks
Tung Do
The Touch Up Outside is triggered when the view is touched, but then the finger moved outside the view and is lifted. You cannot get touch events for other views with that.
To accomplish what you want, you need a transparent view (opaque = NO, backgroundColor = [UIColor clearColor]) that fills the whole screen behind your view of interest. And for that you can catch the Touch Up Inside event and then hide both views.
I have done this in the past by creating a custom UIView and then overriding the pointInside method of the UIView class. That is the method that will fire every time a UIView gets a touch notification. When that happens you can then find out whether or not the touch was inside or outside of your views bounds.
For example your custom UIView could look like this:
CustomTouchUIView.h
#import
#protocol CustomTouchUIViewDelegate
- (void) uiViewTouched:(BOOL)wasInside;
#end
#interface CustomTouchUIView : UIView
// Properties
#property (nonatomic, assign) id delegate;
#end
CustomTouchUIView.m
#import "TOTouchUIView.h"
#implementation CustomTouchUIView
#pragma mark - Synthesize
#synthesize delegate;
#pragma mark - Touches
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
if( point.x > 0 && point.x < self.frame.size.width && point.y > 0 && point.y < self.frame.size.height )
{
[delegate uiViewTouched:YES ];
return YES;
}
[delegate uiViewTouched:NO ];
return NO;
}
#end
I have a downloadable example / tutorial online here
Related
Well, i have gone through some decent goggling before posting this question but was unsuccessful in finding the right answers.
I cant really explain my entire app scenario here as it is a bit complex to explain. So, let me make this question very very simple. How can i change the frame of the UIKeyBoard.i.e. I want the UIKeyBoard to rotate or translate 90 degrees upwards to support my view position.
Is there a way out for me?
You can't change the default keyboard. You can, however, create a custom UIView to be used as keyboard replacement by setting it as inputView on, for example, a UITextField.
While creating a custom keyboard takes a bit of time, it works well with older iOS versions (inputView on the UITextField is available in iOS 3.2 and later) and supports physical keyboards (the keyboard is hidden automatically if one is connected).
Here's some sample code to create a vertical keyboard:
Interface:
#import <UIKit/UIKit.h>
#interface CustomKeyboardView : UIView
#property (nonatomic, strong) UIView *innerInputView;
#property (nonatomic, strong) UIView *underlayingView;
- (id)initForUnderlayingView:(UIView*)underlayingView;
#end
Implementation:
#import "CustomKeyboardView.h"
#implementation CustomKeyboardView
#synthesize innerInputView=_innerInputView;
#synthesize underlayingView=_underlayingView;
- (id)initForUnderlayingView:(UIView*)underlayingView
{
// Init a CustomKeyboardView with the size of the underlying view
// You might want to set an autoresizingMask on the innerInputView.
self = [super initWithFrame:underlayingView.bounds];
if (self)
{
self.underlayingView = underlayingView;
// Create the UIView that will contain the actual keyboard
self.innerInputView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, underlayingView.bounds.size.height)];
// You would need to add your custom buttons to this view; for this example, it's just red
self.innerInputView.backgroundColor = [UIColor redColor];
[self addSubview:self.innerInputView];
}
return self;
}
-(id)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
// A hitTest is executed whenever the user touches this UIView or any of its subviews.
id hitTest = [super hitTest:point withEvent:event];
// Since we want to ignore any clicks on the "transparent" part (this view), we execute another hitTest on the underlying view.
if (hitTest == self)
{
return [self.underlayingView hitTest:point withEvent:nil];
}
return hitTest;
}
#end
Using the custom keyboard in some UIViewController:
- (void)viewDidLoad
{
[super viewDidLoad];
CustomKeyboardView *customKeyboard = [[CustomKeyboardView alloc] initForUnderlayingView:self.view];
textField.inputView = customKeyboard;
}
I have a UIControl which implements the touches began method like so:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[super touchesBegan:touches withEvent:event];
//More code goes here
This subclass of UIControl is instantiated in a view controller, it is then added as a subview to that view controller. I have a breakpoint at the touches began method of the UIControl, and the method never gets called. I've been doing some reading and it seems that the View Controller has some logic that decides whether to pass on touch events to its subviews. The strange thing is that I have a different subclass of UIControl in the same view controller, and the touch events get passed down to it when the user touches it!
Here is the full code:
.h
#import <UIKit/UIKit.h>
#interface CustomSegment : UIView
#property (nonatomic, strong) UIImageView *bgImageView;
#property (nonatomic, assign) NSInteger segments;
#property (nonatomic, strong) NSArray *touchDownImages;
#property (nonatomic, readonly, assign) NSInteger selectedIndex;
#property (nonatomic, weak) id delegate;
- (id)initWithPoint:(CGPoint)point numberOfSegments:(NSInteger)_segments andTouchDownImages:(NSArray *)_touchDownImages;
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
#end
.m
#import "CustomSegment.h"
#implementation CustomSegment
#synthesize bgImageView, segments, touchDownImages, selectedIndex, delegate;
- (id)initWithPoint:(CGPoint)point
numberOfSegments:(NSInteger)_segments
andTouchDownImages:(NSArray *)_touchDownImages
{
self = [super initWithFrame:CGRectMake(point.x, point.y, [[_touchDownImages objectAtIndex:0] size].width, [[touchDownImages objectAtIndex:0] size].height)];
if (self)
{
touchDownImages = _touchDownImages;
segments = _segments;
bgImageView = [[UIImageView alloc] initWithImage:[touchDownImages objectAtIndex:0]];
[self addSubview:bgImageView];
}
return self;
}
- (BOOL)beginTrackingWithTouch:(UITouch *)touch withEvent:(UIEvent *)event
{
return YES;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
//[super touchesBegan:touches withEvent:event];
UITouch *touch = [touches anyObject];
float widthOfSegment = [self frame].size.width / segments;
float bottomPoint = 0;
float topPoint = widthOfSegment;
for (int i = 0; i < segments; i++)
{
if ([touch locationInView:self].x > bottomPoint && [touch locationInView:self].x < topPoint)
{
[bgImageView setImage:[touchDownImages objectAtIndex:i]];
selectedIndex = i;
return;
}
else
{
bottomPoint = topPoint;
topPoint += topPoint;
}
}
}
#end
tl;dr Set all subviews of the UIControl to setUserInteractionEnabled:NO. UIImageViews have it set to NO by default.
Original Post
One thing I found recently is that it helps if the top-most subview of the UIControl has setUserInteractionEnabled:NO. I arrived at this because I had a UIControl subclass with a UIImageView as it's only subview and it worked fine. UIImageView has userInteractionEnabled set to NO by default.
I also had another UIControl with a UIView as it's top most subview (technically the same UIControl in a different state). I believe UIView defaults to userInteractionEnabled == YES, which precluded the events being handled by the UIControl. Settings the UIView's userInteractionEnabled to NO solved my issue.
I don't know if it's the same issue here, but maybe that will help?
--
Edit: When I say topmost view... probably set all subviews of the UIControl to setUserInteractionEnabled:NO
Check frames of all parent views. The rule is that if sub-view (or its part) of the view is outside the view bounds, it doesn't receive touch events.
Xcode 12 and Latter.
As mention in the accepted answer, make sure all the subviews of the
UIControl view get "User Interaction Enabled" unchecked.
Select your
UIControl view and switch to the "Connection Inspector" and make
sure it has been connected to "Touch Up Inside" event. Sometimes
Xcode uses "Value Changed" event so make sure to change to "Touch
Up Inside" event
It is possible that another view is covering your UIControl, and preventing it from receiving the touch events. Another possibility is that userInteractionEnabled is set to NO somewhere by mistake.
EDIT: I see that you added more code above. Did you verify that your view's frame has a width and height greater than zero? It looks to me like you are calling "size" directly on an object from NSArray (which is 'id'). I don't know how you are doing this without a cast (perhaps the parenthesis didn't come through above?) but if you are somehow pulling it off I wouldn't be surprised if it was an invalid value.
First, why do you call [super touchesBegan:touches withEvent:event];? This call is forwarding the event to the next responder. Usually you do it only when you don't want to handle the event. Are you sure you know what are you doing there?
An idea why it doesn't work - can it be that you have a gesture recognizer which handles the event first?
Anyway, do you really need to override touchesBegan? UIControl is made to track the touch events by itself and call your handlers in response. And the UIControl docs say HOW to subclass it.
Subclassing Notes
You may want to extend a UIControl subclass for either of two reasons:
To observe or modify the dispatch of action messages to targets for particular events
To do this, override sendAction:to:forEvent:, evaluate the passed-in selector, target object, or UIControlEvents bit mask, and proceed as required.
To provide custom tracking behavior (for example, to change the highlight appearance)
To do this, override one or all of the following methods: beginTrackingWithTouch:withEvent:, continueTrackingWithTouch:withEvent:, endTrackingWithTouch:withEvent:.
Possibilities:
You might have forgot to set the delegate for the UIControl.
The other UIControl which receives the touch is obscuring/covering over the UIControl.
Fair enough. Recently re-investigated this (UIControl is very poorly documented) and realised that tracking touches is a replacement for touchesBegan/Ended, not an additional, so sorry about that. I'd reverse the vote but it wouldn't let me :(
You might need to override intrinsicContentSize inside your UIControl subclass.
override var intrinsicContentSize: CGSize {
return CGSize(width: 150, height: 100)
}
I don't quite understand how it fixes it or why, but it works. It doesn't even need to be the exact size as your control.
UIView instances are unable to respond to events so there is no way, up to your current configuration, to trigger your action method ?
Try to change the class of the view to be an instance of the UIControl class !
I would like to be able to paint on top of my subviews, or in other words: have an overlay that does not block the events. So far I discovered:
- any instructions in drawRect are painted below subviews,
- putting a transparent UIView on top blocks events.
Is there another trick I can try?
Use a transparent UIView on top, and in IB uncheck "User Interaction Enabled" for that view, then input events will go down to your controls beneath it.
Or, in code do:
UIView *overlayView = [[UIView alloc] init...];
overlayView.userInteractionEnabled = NO;
To solve this you want to forward the hitTest events. Add the code below to your project, add a UIImageView to your interface, set its Class to ClickThroughImageView and connect the "onTopOf" outlet to whatever UIView is below the image.
The ClickThroughImageView.h file:
#import <Foundation/Foundation.h>
#interface ClickThroughImageView : UIImageView
{
IBOutlet UIView *onTopOf;
}
#property (nonatomic, retain) UIView *onTopOf;
#end
The ClickThroughImageView.m file
#import "ClickThroughImageView.h"
#implementation ClickThroughImageView : UIImageView
#synthesize onTopOf;
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
return [onTopOf hitTest:point withEvent:event];
}
#end
I want to preface this question with the fact I am new to the iphone application development and many times believe I may be over my head. I am trying to find an action that will allow me to double tap anywhere within my full screen UIScrollView to return to my main menu (MainMenuViewController).
I currently have the following code running for my ScrollViewController...
ScrollViewController.h
#import <UIKit/UIKit.h>
#interface ScrollViewController : UIViewController <UIScrollViewDelegate>
{
}
#end
ScrollViewController.m
#import "ScrollViewController.h"
UIScrollView *myScrollView;
UIPageControl *myPageControl;
#implementation ScrollViewController
- (void)loadScrollViewWithPage:(UIView *)page
{
int pageCount = [[myScrollView subviews] count];
CGRect bounds = myScrollView.bounds;
bounds.origin.x = bounds.size.width * pageCount;
bounds.origin.y = 0;
page.frame = bounds;
[myScrollView addSubview:page];
}
...etc
Any advice or sample code to implement a double tap within the ScrollView Controller to allow me to return to my MainMenuViewController would be greatly appreciated. Also please include any Interface Builder changes to the view (if necessary). I have been pouring over the forums for days and have not been able to successfully implement this action. Thanks...R.J.
First of all, create a subclass of a UIScrollView:
#import <UIKit/UIKit.h>
#interface MyScrollView : UIScrollView {
}
#end
Implement it:
#import "MyScrollView.h"
#implementation MyScrollView
- (void) touchesEnded: (NSSet *) touches withEvent: (UIEvent *) event {
if (!self.dragging) {
[self.nextResponder touchesEnded: touches withEvent:event];
}
[super touchesEnded: touches withEvent: event];
}
- (void)dealloc {
[super dealloc];
}
#end
Then, use this subclass instead of a normal UIScrollView in your main View Controller. This will call the touchesEnded:withEvent: method (alternatively, you can call any method you want). Then, track for double taps (if you need info on how to do that, let me know).
I have a UIWebView with a navigation bar and toolbar that I want to auto hide. I'm doing that already, but I want to show them when the user taps on the UIWebView.
My problem is that the UIWebView captures all the touches events, and I cannot intercept the one I need.
Is there any workaround for this?
Taken from a blog entry (doesn't load, but thankfully it's Google Cache'd) by Mithin Kumar.
(Mithin, I hope you don't mind me reposting it here; if you do, please let me know in the comments and I will remove it.)
Recently, I was working on a project which required detection of tap and events on the UIWebView. We wanted to find out the HTML element on which the user taps in the UIWebView and then depending on the element tapped some action was to be performed. After some Googling, I found out the most of the users lay a transparent UIView on top of the UIWebView, re-implement the touch methods of UIResponder class (Ex: -touchesBegan:withEvent:) and then pass the events to the UIWebView. This method is explained in detail here. There are multiple problems with the method.
Copy/Selection stops working on UIWebView
We need to create a sub-class of UIWebView while Apple says we should not sub-class it.
A lot other UIWebView features stop working.
We ultimately found out that the right way to implement this is by
sub-classing UIWindow and re-implementing the -sendEvent: method. Here
is how you can do it. First, create a UIWindow sub-class
#import <UIKit/UIKit.h>
#protocol TapDetectingWindowDelegate
- (void)userDidTapWebView:(id)tapPoint;
#end
#interface TapDetectingWindow : UIWindow {
UIView *viewToObserve;
id <TapDetectingWindowDelegate> controllerThatObserves;
}
#property (nonatomic, retain) UIView *viewToObserve;
#property (nonatomic, assign) id <TapDetectingWindowDelegate> controllerThatObserves;
#end
Note that we have variables which tell us the UIView on which to
detect the events and the controller that receives the event
information. Now, implement this class in the following way
#import "TapDetectingWindow.h"
#implementation TapDetectingWindow
#synthesize viewToObserve;
#synthesize controllerThatObserves;
- (id)initWithViewToObserver:(UIView *)view andDelegate:(id)delegate {
if(self == [super init]) {
self.viewToObserve = view;
self.controllerThatObserves = delegate;
}
return self;
}
- (void)dealloc {
[viewToObserve release];
[super dealloc];
}
- (void)forwardTap:(id)touch {
[controllerThatObserves userDidTapWebView:touch];
}
- (void)sendEvent:(UIEvent *)event {
[super sendEvent:event];
if (viewToObserve == nil || controllerThatObserves == nil)
return;
NSSet *touches = [event allTouches];
if (touches.count != 1)
return;
UITouch *touch = touches.anyObject;
if (touch.phase != UITouchPhaseEnded)
return;
if ([touch.view isDescendantOfView:viewToObserve] == NO)
return;
CGPoint tapPoint = [touch locationInView:viewToObserve];
NSLog(#"TapPoint = %f, %f", tapPoint.x, tapPoint.y);
NSArray *pointArray = [NSArray arrayWithObjects:[NSString stringWithFormat:#"%f", tapPoint.x],
[NSString stringWithFormat:#"%f", tapPoint.y], nil];
if (touch.tapCount == 1) {
[self performSelector:#selector(forwardTap :) withObject:pointArray afterDelay:0.5];
}
else if (touch.tapCount > 1) {
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:#selector(forwardTap :) object:pointArray];
}
}
#end
Implement the sendEvent method in the above way, and then you can send
back the information you want back to the controller.
There are few things that one needs to keep in mind. Make sure in your
MainWindow.xib file, the window is of type TapDetectingWindow and not
UIWindow. Only then all the events will pass through the above
re-implemented sendEvent method. Also, make sure you call [super
sendEvent:event] first and then do whatever you want.
Now, you can create your UIWebView in the controller class in the
following way
#interface WebViewController : UIViewController<TapDetectingWindowDelegate> {
IBOutlet UIWebView *mHtmlViewer;
TapDetectingWindow *mWindow;
}
- (void)viewDidLoad {
[super viewDidLoad];
mWindow = (TapDetectingWindow *)[[UIApplication sharedApplication].windows objectAtIndex:0];
mWindow.viewToObserve = mHtmlViewer;
mWindow.controllerThatObserves = self;
}
Remember you’ll need to write the method userDidTapWebView in your
controller class. This is the method that is called in order to send
the event information to the controller class. In our case above we
are sending the point in the UIWebView at which the user tapped.
You can very simply use a UITapGestureRecognizer to detect tap gestures on a UIWebView. You must implement a UIGestureRecognizerDelegate method to allow the simultaneous recognition however.
- (void)viewDidLoad{
[super viewDidLoad];
UITapGestureRecognizer *targetGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTap:)];
targetGesture.numberOfTapsRequired = 2;
targetGesture.delegate = self;
[self.webView addGestureRecognizer:targetGesture];
}
// called when the recognition of one of gestureRecognizer or otherGestureRecognizer would be blocked by the other
// return YES to allow both to recognize simultaneously. the default implementation returns NO (by default no two gestures can be recognized simultaneously)
//
// note: returning YES is guaranteed to allow simultaneous recognition. returning NO is not guaranteed to prevent simultaneous recognition, as the other gesture's delegate may return YES
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
NSLog(#"%#", otherGestureRecognizer);
//if you would like to manipulate the otherGestureRecognizer here is an example of how to cancel and disable it
if([otherGestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]){
UITapGestureRecognizer *tapRecognizer = (UITapGestureRecognizer*)otherGestureRecognizer;
if(tapRecognizer.numberOfTapsRequired == 2 && tapRecognizer.numberOfTouchesRequired == 1){
//this disalbes and cancels all other singleTouchDoubleTap recognizers
// default is YES. disabled gesture recognizers will not receive touches. when changed to NO the gesture recognizer will be cancelled if it's currently recognizing a gesture
otherGestureRecognizer.enabled = NO;
}
}
return YES;
}
-(void)handleTap:(id)sender{
}
I had several issues trying to use brian.clear's answer (copied from a extinct post by Mithin Kumar) in my iOS 5-7, universal, storyboard-based, totally ARC project so I had to make several changes. I also improved some things and made it easier to understand (at least for me). If you are having trouble trying to use that answer from 2009 maybe you should try my update. Detailed instructions:
1. Create a new TapDetectingWindow class
TapDetectingWindow.h
// Created by Cristian Perez <cpr#cpr.name>
// Based on https://stackoverflow.com/a/1859883/423171
#import <UIKit/UIKit.h>
#protocol TapDetectingWindowDelegate
- (void)userDidTapView:(CGPoint)tapPoint;
#end
#interface TapDetectingWindow : UIWindow
#property (nonatomic) UIView *tapDetectingView;
#property (nonatomic) id <TapDetectingWindowDelegate> tapDetectedDelegate;
#end
TapDetectingWindow.m
// Created by Cristian Perez <cpr#cpr.name>
// Based on https://stackoverflow.com/a/1859883/423171
#import "TapDetectingWindow.h"
#implementation TapDetectingWindow
#synthesize tapDetectingView;
#synthesize tapDetectedDelegate;
- (id)initWithFrame:(CGRect)frame
{
return [super initWithFrame:frame];
}
- (void)sendEvent:(UIEvent *)event
{
[super sendEvent:event];
if (tapDetectingView == nil || tapDetectedDelegate == nil)
{
return;
}
NSSet *touches = [event allTouches];
if (touches.count != 1)
{
return;
}
UITouch *touch = touches.anyObject;
if (touch.phase != UITouchPhaseEnded)
{
return;
}
if (touch.view != nil && ![touch.view isDescendantOfView:tapDetectingView])
{
return;
}
CGPoint tapPoint = [touch locationInView:tapDetectingView];
NSString *tapPointStr = NSStringFromCGPoint(tapPoint);
if (touch.tapCount == 1)
{
[self performSelector:#selector(notifyTap:) withObject:tapPointStr afterDelay:0.4];
// Make the afterDelay value bigger in order to have more chances of detecting a double tap and thus being able to cancel the single tap event, or make it smaller if you don't care about double taps and want to get the tap event as soon as possible
}
else if (touch.tapCount > 1)
{
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:#selector(notifyTap:) object:tapPointStr];
}
}
- (void)notifyTap:(NSString *)tapPointStr
{
CGPoint tapPoint = CGPointFromString(tapPointStr);
[tapDetectedDelegate userDidTapView:tapPoint];
}
#end
2. Check you have a window declared in your app delegate
You should have something like this in YourAppDelegate.h. Don't change the name of the property!
#interface YourAppDelegate : UIResponder <UIApplicationDelegate>
{
// ...
}
// ...
// The app delegate must implement the window property if it wants to use a main storyboard file
#property (nonatomic) UIWindow *window;
#end
3. Override the window property of your app delegate
Just like this, which should be in YourAppDelegate.m. Again, don't change the name of the method!
// Replace the default UIWindow property with a TapDetectingWindow
- (TapDetectingWindow *)window
{
static TapDetectingWindow *tapDetectingWindow = nil;
if (!tapDetectingWindow)
{
tapDetectingWindow = [[TapDetectingWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
}
return tapDetectingWindow;
}
4. Set the delegate protocol in your view controller
Be sure to adopt the tap handling protocol in your MainViewController.h
#import "TapDetectingWindow.h"
#interface MainViewController : UIViewController <TapDetectingWindowDelegate, ...>
{
// ...
}
// ...
#end
5. Set up the tap detecting window and tap event handler
Specify your webview (actually any UIView should work) and tap event handler in your view controller's (void)viewDidLoad method
- (void)viewDidLoad
{
// ...
// Allow tap detection in webview
TapDetectingWindow *tapDetectingWindow = (TapDetectingWindow*)[(YouTubeRPAppDelegate*)[[UIApplication sharedApplication] delegate] window];
tapDetectingWindow.tapDetectingView = self.webView; // Your UIWebView
tapDetectingWindow.tapDetectedDelegate = self;
}
6. Handle the tap event as you wish
Just implement the userDidTapView method in your view controller
- (void)userDidTapView:(CGPoint)tapPoint
{
NSLog(#"Tap detected in webview at %#", NSStringFromCGPoint(tapPoint));
}
Most of the approaches deal with a complicated pair of UIView and UIWebView subclasses and overrode -touchesBegan:withEvent: etc. methods.
This JavaScript-based approach intercepts touches on the web DOM itself, and it seems like a clever way to sidestep the more complex process. I haven't tried it myself, but I'm curious to know the results, if you give it a shot.
I'm not sure of the exact implementation details but you need to subclass UIWindow and override sendEvent:. Then you can capture tap events and handle them accordingly, before they get down to the web view. Hope this points you in the right direction!
Create a UIView sub class containing the whole UIWebView. Then the event hitTest will be fired on touching the webview. Note: Don't put anything to the container except the webView.
#interface myWebViewContainer : UIView
... ...
#end
Then override the hitTest event:
-(UIView*) hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
NSLog(#"Hit test %#", [event description]);
UIView * returnView = [super hitTest:point withEvent:event];
[delegate userDidTapWebView];// notify the delegate that UIWebView is being touched by some naughty user :P
return returnView;
}
A much simpler approach since iOS 3.2 is simply to use a UITapGestureRecognizer.
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
UITapGestureRecognizer* tapGestureRecognizer = [[[UITapGestureRecognizer alloc] initWithTarget:self
action:#selector(userDidTapWebView)] autorelease];
[self.pdfWebView addGestureRecognizer:tapGestureRecognizer];
}
- (void)userDidTapWebView {
NSLog(#"TAP");
}