I try to capture events on a subclassed MKOverlayView with a UIGestureRecognizer.
However the selector never gets fired. Any ideas?
interface:
#import <MapKit/MapKit.h>
#interface XYOverlayView : MKCircleView {}
-(void) viewTapped:(UIGestureRecognizer *)gestureRecognizer;
#end
imp:
#implementation XYOverlayView
- (id)initWithOverlay:(id <MKOverlay>)overlay
{
if(self = [super initWithOverlay:overlay])
{
self.userInteractionEnabled = TRUE;
self.multipleTouchEnabled = TRUE;
UITapGestureRecognizer *tapRecogniser = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(viewTapped:)];
[self addGestureRecognizer:tapRecogniser];
[tapRecogniser release];
}
return self;
}
-(void) viewTapped:(UIGestureRecognizer *)gestureRecognizer
{
NSLog(#"XYOverlayView tapped");
}
#end
you forgot to implement the UIGestureRecognizerDelegate in your interface and you have to import the UIKit
#import <UIKit/UIKit.h>
#interface XYOverlayView : MKCircleView <UIGestureRecognizerDelegate>
Make sure to specify the numberOfTapsRequired and numberOfTouchesRequired otherwise the gesture recognizer doesn't know what to accept as a 'tap'.
tapRecogniser.numberOfTapsRequired = 1;
tapRecogniser.numberOfTouchesRequired = 1;
Did not get this to work. Switched to an custom MKAnnotationView to capture the gestures. This also has the advantage the tapable region in the window stays the same size.
I think my answer here might be a solution: MKOverlayView and touches
Related
I say first that I'm completely new to objectiveC and am also working with interface builder the first time.
I just want to make the pan gesture work (I will need the zoom gesture also for what I really want to do but I thought if I start with the easier pan).
I followed some tutorial but it still doesn't work neither on my iPhone 5 nor in the simulator.
I've started the thing based on a page based application. I then established a new view and a view controller for that one. Then I dragged and dropped the Pan Gesture from Interface builder to the view. User Interaction on the view is enabled.
Here is my code:
uACropViewController.h
#import <UIKit/UIKit.h>
#interface uACropViewController : UIViewController
- (IBAction)handlePan:(UIPanGestureRecognizer *)recognizer;
#property (weak, nonatomic) IBOutlet UIImageView *CropImage;
#property (strong, nonatomic) IBOutlet UIPanGestureRecognizer *onGestureAction;
#end
uACropViewController.m
#import "uACropViewController.h"
#interface uACropViewController ()
#end
#implementation uACropViewController
#synthesize CropImage;
static CGPoint originalPoint;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
//for resetting the center of the image, when the pan gesture is ended.
originalPoint=CropImage.center;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(IBAction)onGestureAction:(id)sender{
if ([sender isKindOfClass:[UIPanGestureRecognizer class]]) {
//is a pan gesture
UIPanGestureRecognizer *recognizer=(UIPanGestureRecognizer *)sender;
if (recognizer.state==UIGestureRecognizerStateBegan||recognizer.state==UIGestureRecognizerStateChanged) {
CGPoint nextPoint= [recognizer translationInView:self.view];
CGPoint currentPoint=CropImage.center;
currentPoint.x +=nextPoint.x;
currentPoint.y +=nextPoint.y;
CropImage.center=currentPoint;
[recognizer setTranslation:CGPointZero inView:self.view];
}
if (recognizer.state==UIGestureRecognizerStateEnded) {
CropImage.center=originalPoint;
[recognizer setTranslation:CGPointZero inView:self.view];
}
return;
}
}
#end
To be honest I have no idea of what's going wrong here. so any help or pointers are appreciated!
thanks,
Suse
The IBOutlet is the reference to that object in the view, the IBAction is the action that is called when an event is triggered on that variable.
For example, you can have a UIButton IBOutlet to change properties of the UIButton like the size, and a UIButton IBAction to recognise when the button is pressed.
In your case, onGestureAction is a variable that points to that gesture recognizer, and hanldePan: is the action responder.
Try adding the method here:
- (IBAction)handlePan:(UIPanGestureRecognizer *)recognizer
{
if (recognizer.state==UIGestureRecognizerStateBegan||recognizer.state==UIGestureRecognizerStateChanged) {
CGPoint nextPoint= [recognizer translationInView:self.view];
CGPoint currentPoint=CropImage.center;
currentPoint.x +=nextPoint.x;
currentPoint.y +=nextPoint.y;
CropImage.center=currentPoint;
[recognizer setTranslation:CGPointZero inView:self.view];
}
if (recognizer.state==UIGestureRecognizerStateEnded) {
CropImage.center=originalPoint;
[recognizer setTranslation:CGPointZero inView:self.view];
}
return;
}
I have a custom UITableViewCell which has a text field inside it. I have created it using IB and have a custom class with it.
Now, my issue is that I want to setup the text field so that during text entry if the user clicks outside the text field (without hitting the return/done key on the keypad), the field resigns first responder. I understand, that do that I need to handle the Touch Up Inside Event. However my tableview class never receives this event even though I have done the connections. I am assuming that its because its not subclass of UIcontrol, which I cant make it as it needs to be UITableViewCel.
So whats the solution?? How do I receive these events??
Header File:
#import <UIKit/UIKit.h>
#interface MMSingleTextFieldCell : UITableViewCell <UITextFieldDelegate>
// Properties
#property (weak, nonatomic) IBOutlet UITextField *singleTextField;
// Methods
- (IBAction)eventTouchUpOutside:(id)sender;
- (IBAction)eventTouchUpInside:(id)sender;
#end
Class File:
#import "MMSingleTextFieldCell.h"
#implementation MMSingleTextFieldCell
#synthesize singleTextField;
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
// Initialization code
}
return self;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
- (IBAction)eventTouchUpOutside:(id)sender {
[singleTextField resignFirstResponder];
}
- (IBAction)eventTouchUpInside:(id)sender {
[singleTextField resignFirstResponder];
}
I have just recently open sourced a project on Github that should make this all relatively easy to do. It includes a class that can be easily inserted into a cell and a sample project demonstrating its capabilities.
If you look in RootTableViewController's viewDidLoadMethod you will see that I am adding a gesture recognizer:
self.tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self
action:#selector(dismissKeyboard)];
_tapGestureRecognizer.delegate = self;
_tapGestureRecognizer.cancelsTouchesInView = NO;
[self.tableView addGestureRecognizer:_tapGestureRecognizer];
Add the dismiss keyboard method:
- (void)dismissKeyboard {
[_textField resignFirstResponder];
}
Add a gesture recognizer callback (in RootTableViewController):
//see: http://stackoverflow.com/questions/7195661/why-is-uigesturerecognizer-being-called-on-my-textfield-clear-button
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
if([touch.view isKindOfClass:[UITextField class]] ||
[touch.view isKindOfClass:[UIButton class]])
{
return NO;
}
return YES;
}
Of course, this means you have to make RootTableViewController adhere to the UIGestureRecognizerDelegate protocol (in the header file):
#interface RootTableViewController : UITableViewController<SATextFieldDelegate, UIGestureRecognizerDelegate>
If you want the user to scroll the table view and dismiss the keyboard implement the following table view delegate callback:
- (void)scrollViewWillBeginDragging:(UIScrollView *)activeScrollView {
if (_textField.isFirstResponder) {
[self dismissKeyboard];
}
}
I believe this is the function you want.
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{
if (_textField.isFirstResponder) {
[self dismissKeyboard];
}
}
Try this:
1) Implement the UIGestureRecognizerDelegate protocol
2) In viewDidLoad for example, create the following
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
initWithTarget:self
action:#selector(hideKeyboard:)];
tap.delegate = self;
[self.view addGestureRecognizer:tap];
3) Now, implement the method from protocol from 1
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch{
// Use this for allow some control to receive his natural tap event. You can use tap.cancelsTouchesInView = NO; in the 2 step instead of this, try both of then and choose on your own.
if (touch.view == <some control>) {
//NSLog(#"NO");
return NO;
}
//NSLog(#"YES");
return YES;
}
4) finally, implement the callback for tap
-(void) hideKeyboard:(id)sender{
if (<your edit text>.isEditing) {
[<your edit text> resignFirstResponder];
}
}
I hope this will help, or at least point you to the right direction
I have subclassed UITableViewController and inside table I have custom cells. And this custom cells have subclassed UIView inside. So this UIView is written in its own class. In my code the UITableViewController class is named MainViewController.h/.m and UIView's class is named ContentView.h/.m So in ContentView I added an image and tapGestureRecognizer. To when the image is tapped some date(in this case digit) is send to MainViewController. The first problem is that the delegate method does not get called. And if I call it with notificationCenter it logged it as 0.00000 Can someone help me to pass data from view inside cell to ViewController.
This is my code:
ContentView.h:
#class ContentView;
#protocol ContentViewDelegate
- (void)passDigit:(float)someDigit;
#end
#import <UIKit/UIKit.h>
#import "MainViewController.h"
#interface ContentView : UIView
{
id <ContentViewDelegate> delegate;
float someDigit;
}
#property float someDigit;
#property (assign) id <ContentViewDelegate> delegate;
#end
ContentView.m
#import "ContentView.h"
#implementation ContentView
#synthesize someDigit;
#synthesize delegate;
- (void)handleContentTouch:(UIGestureRecognizer *)gesture
{
someDigit = 134;
[self.delegate passDigit:someDigit];
}
- (void)setupView
{
CGRect frame = self.frame;
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:#selector(handleContentTouch:)];
UIImageView *fifthBackground = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,100,100)];
[self addSubview:fifthBackground];
[fifthBackground setUserInteractionEnabled:YES];
[fifthBackground addGestureRecognizer:tap];
}
MainViewController.h
#import <UIKit/UIKit.h>
#import "ContentView.h"
#interface MainViewController : UITableViewController <UITableViewDelegate, UITableViewDataSource, UIScrollViewDelegate, ContentViewDelegate>
#end
MainViewContorller.m
#import "MainViewController.h"
#implementation MainViewController
- (void)viewDidLoad
{
[super viewDidLoad];
ContentView *contentView = [[ContentView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
contentView.delegate = self;
}
- (void) passDigit:(float)someDigit
{
NSLog(#"%f",someDigit);
}
Not sure what you are trying to do, may be you are new and learning out some things. Try doing the following:
Change your method in mainViewController
- (void) showDetailViewControllerWithDigit:(float)someDigit
{
NSLog(#"%f",someDigit);
}
to
- (void)passDigit:(float)someDigit
{
NSLog(#"%f",someDigit);
}
and it should work. Also not very relevant here but you have spelled delegate and delegete in two different places. Be mindful that they both will be considered as two different variables. Though not necessary to have an instance variable with the same name, I would definitely not have it with a slight typo, because it will cause a lot of problems later.
When you define a protocol for a delegate, the methods you have defined there should be implemented in the delegate class.
Also in your code you have, obviously you have missed some parts, which show as to where you are adding the contentView in the main view controller. I am assuming that some where you have
[self.view addSubview:contentView];
in the viewDidLoad or some where, without which you cannot even see the contentView and there fore cannot tap it.
Happy coding.
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");
}