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).
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 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
I am developing a sample application, where I have a situation for moving a UITextFields, UILabels etc., across the screen. I am not able to find any resource for implementing this.
I want to implement like this for a UITextField
Since you have an excellent tutorial on dragging already, I will assume your problem is the keyboard that comes up when you try to drag a UITextField instead of a UIView. The solution should be pretty simple: myTextField.userInteractionEnabled = NO; - that should disable user interaction and make it "read only". Perhaps have an edit mode where all text fields get this flag set. If it causes trouble, then add the textField to a UIView and then set the userInteractionEnabled to false. Then you can drag the UIView and it will drag the text field with it.
I followed Michael's suggestion and got the solution.I have given the code snippets below which will be useful for those who need to implement the same.
Steps:
Choose windows based application,then create a UIViewController subclass and add it to the window in the appdelegate file.
In the XIB of the viewcontroller class you created add UIViews and add the controls like textfield etc.,to the UIViews that you have created.We are going to move these views only,so add IBOutlets in the .h file of the view controller subclass and map them to the IB accordingly.
Sample Code
appdelegate.h
#import <UIKit/UIKit.h>
#import "MyView.h"
#interface MyAppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
MyView *viewController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#end
appdelegate.m
#import "MyAppDelegate.h"
#implementation MyAppDelegate
#synthesize window;
- (void)applicationDidFinishLaunching:(UIApplication *)application {
// Override point for customization after application launch.
viewController=[[MyView alloc]init];
[window addSubview:viewController.view];
[window makeKeyAndVisible];
}
- (void)dealloc {
[viewController release];
[window release];
[super dealloc];
}
#end
viewcontroller.h
#import <UIKit/UIKit.h>
#interface MyView : UIViewController {
IBOutlet UIView *textFieldView;
IBOutlet UIView *labelView;
}
#end
viewcontroller.m
#import "MyView.h"
#implementation MyView
- (void)viewDidLoad {
[self.view addSubview:textFieldView];
[self.view addSubview:labelView];
[super viewDidLoad];
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
// get touch event
UITouch *touch = [[event allTouches] anyObject];
CGPoint touchLocation = [touch locationInView:self.view];
if ([touch view] == textFieldView) {
// move the image view
textFieldView.center = touchLocation;
}
if ([touch view] == labelView) {
// move the image view
labelView.center = touchLocation;
}
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
#end
Thank u all.Have a niece time.
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
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");
}