I have two labels in two different positions, when both labels are tapped at the same time i want another label to show a success message.
How do I accomplish this? I can recognize a single tap or double tap with one or more finger touches but this is a different scenario. Please help. I tried this, but it does not work.
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTap:)];
tapRecognizer.numberOfTapsRequired = 1;
tapRecognizer.numberOfTouchesRequired = 2;
tapRecognizer.delegate = self;
[self.view addGestureRecognizer:tapRecognizer];
-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
if (touch.view == tap2 && touch.view == tap1)
{
result.text = #"success";
}
return YES;
}
Thanks in advance.
What you're trying to detect isn't really a single gesture.
I'd suggest adding a tap gesture recogniser to each button. The handler would:
Store the time of the tap (at the moment that the handler is called)
Compare this time with the time that the other button was last
tapped. If the times are very similar (perhaps 0.25 secs apart),
consider that they've both been tapped simultaneously and react
accordingly.
Play with the time interval on a real device to find the ideal amount.
UPDATE:
A code snippet that obviously hasn't been tested in any way:
- (void)handleButton1Tap:(UITapGestureRecognizer *)sender {
if (sender.state == UIGestureRecognizerStateEnded)
{
self.button1TapTime = CACurrentMediaTime();
[self testForSimultaneousTap];
}
}
- (void)handleButton2Tap:(UITapGestureRecognizer *)sender {
if (sender.state == UIGestureRecognizerStateEnded)
{
self.button2TapTime = CACurrentMediaTime();
[self testForSimultaneousTap];
}
}
- (void)testForSimultaneousTap
{
if (fabs(self.button1TapTime - self.button2TapTime) <= 0.2)
{
// Do stuff
}
}
where self.button1TapTime and self.button2TapTime are member variables (doubles).
Tim
Formally I had accepted termes's answer first and that worked too, but I have found a more simpler solution to this process. There is no need for two gesture recognizers, it is achievable with a simple tap gesture recognizer with number of touches count to two. Here is the code:
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleTap:)];
tapRecognizer.numberOfTapsRequired = 1;
tapRecognizer.numberOfTouchesRequired = 2;
tapRecognizer.delegate = self;
[self addGestureRecognizer:tapRecognizer];
Now, in the handle tap method we can easily get the two touch points by "locationOfTouch:inView:", a instance method of UIGestureRecognizer class. So in the handleTap: method we need to check if the two touch points are in the desired location. Here is the code:
-(void)handleTap:(UITapGestureRecognizer*)recognizer
{
if (recognizer.state == UIGestureRecognizerStateEnded)
{
CGPoint point1 = [recognizer locationOfTouch:0 self];
CGPoint point2 = [recognizer locationOfTouch:1 self];
if ([self validateTapIn:point1 and:point2])
{
resultLabel.text = #"success";
}
}
}
-(BOOL)validateTapIn:(CGPoint)point1 and:(CGPoint)point2
{
return
(CGRectContainsPoint(label1.frame, point1) && CGRectContainsPoint(label2.frame,:point2)) ||
(CGRectContainsPoint(label1.frame, point2) && CGRectContainsPoint(label2.frame, point1));
}
I am faceing a small prob. Please help me.
When i press and hold on my view my function called 2-3 times and some times after releasing hold the long press function again called.
In View did load
-(void)viewdidload
{
UILongPressGestureRecognizer *longPressGesture =
[[[UILongPressGestureRecognizer alloc]
initWithTarget:self action:#selector(longPress:)] autorelease];
[self.view addGestureRecognizer:longPressGesture];
[self.view release];
}
-(void)longPress:(UILongPressGestureRecognizer *)sender
{
NSLog(#"******Long Press*******");
}
Long press printed many times.
You probably want to just return from longPress if the gesture has not ended. Put this code right at the top of longPress:
if (sender.state != UIGestureRecognizerStateEnded)
{
return;
}
I've done the following thing:
buttonPlaylistView = [[UIButton alloc] initWithFrame:CGRectMake(self.view.frame.size.width *(urlList.count+1), 0, self.view.frame.size.width, self.view.frame.size.height)];
buttonPlaylistView.tag = 0;
UITapGestureRecognizer *doubleTap3 = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(handleDoubleTap:)];
[doubleTap3 setNumberOfTapsRequired:2];
[buttonPlaylistView addGestureRecognizer:doubleTap3];
[doubleTap3 release];
-(void) handleDoubleTap:(UITapGestureRecognizer *)sender{
if(sender.state == UIGestureRecognizerStateEnded)
int x = [sender tag];
return;
}
But I get SIGAGRT at this line: int x = [sender tag]; saying:
[UITapGestureRecognizer tag]: unrecognized selector sent to instance 0x61280b0
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITapGestureRecognizer tag]: unrecognized selector sent to instance 0x61280b0'
NOW:What's the problem and what's the solution for this?Thanks
-(void) handleDoubleTap:(UITapGestureRecognizer *)sender
{
if(sender.state == UIGestureRecognizerStateEnded)
{
int x = [sender.view tag];
}
}
Will fix the issue.
An UITapGestureRecognizer does not have a property named tag - as you see, the sender you get is NOT the button. You have to access the buttonPlayListView directly, like
int x = [buttonPlayListView tag];
or otherwise remember which button you want to access.
Even though I'm quite sure that you're going about this the wrong way, adding a double tap gesture recognizer to a UIButton, there is a way you can still perform the task you require that shouldn't be too much work for you.
You've made the comment
and how could I remember if I create let say 100 buttons
to one of the answers, the one which highlights what the issue is that's causing your SIGBART. UIGestureRecognizer does not have a tag property.
Here's what you could do, is to iterate through all the subviews of your [self view] and find the one that has the same UIGestureRecognizer, it's not the prettiest solution, and the more subview's you have the longer the loop will take. But it'll do what you seem to be looking for, so if you're adding .
In your handleDoubleTap function you could do the following
-(void) handleDoubleTap:(UITapGestureRecognizer *)sender
{
if(sender.state == UIGestureRecognizerStateEnded)
{
int iButtonTag = -1 //This is important later to escape the below for loop as we don't need to needlessly go around in circles
for(UIView* psubView in [[self view] subviews])
{
if( [psubView isKindOfClass:[UIButton class]] )
{
UIButton* pButton = (UIButton*)psubView;
for(UIGestureRecognizer* pGesture in [pButton gestureRecognizers] )
{
if( pGesture == sender )//this is the button we're after
{
iButtonTag = [pButton tag];
break;
}
}
if( iButton != -1 )//found what we came for
{
break;
}
}
}
//do what ever it was you needed to do now that you have the views tag, or you could have kept a reference to the button etc.
}
}
That should solve your problem. Alternatively if you're going to be adding buttons to subviews of subviews it would be better to keep track of your UIButtons in an NSMutableArray , you would do this by creating a class property (or member variable) and adding the buttons to this using the 'addObject:' function of NSMutableArray. Then instead of the line
for(UIView* psubView in [[self view] subviews])
above you could exchange that for
for( UIButton* pButton in m_pMutableButtonArray )
where "m_pMutableButtonArray" is the variable name you gave to your NSMutableArray you were storing the UIButtons in. This also means you would do away with the following if isKindOfClass test on the following line.
That should fix your problem.
Why are you putting a UITapGestureRecognizer in a button? The button already handles that for you and will send you a callback, you can add a target to a button using this UIControl method
- (void)addTarget:(id)target action:(SEL)action forControlEvents:(UIControlEvents)controlEvents
Is it just me or has the action sheet on <img> tags been disabled in UIWebView? In Safari, e.g, when you want to save an image locally, you touch and hold on the image to get an action sheet shown. But it's not working in my custom UIWebView. I mean, it is still working for <a> tags, i.e, when I touch and hold on html links, an action sheet shows up. But not for the <img> tags.
I've tried things like putting img { -webkit-touch-callout: inherit; } in css, which didn't work. On the other hand, when I double-tap and hold on the images, a copy-balloon shows up.
So the question is, has the default action sheet callout for <img> tags been disabled for UIWebView? Is so, is there a way to re-enable it? I've googled around and saw many Q&As on how to disable it in UIWebView, so is it just me who aren't seeing the popup?
Thanks in advance!
Yes apple has disabled this feature (among others) in UIWebViews and kept it for Safari only.
However you can recreate this yourself by extending this tutorial, http://www.icab.de/blog/2010/07/11/customize-the-contextual-menu-of-uiwebview/.
Once you've finished this tutorial you'll want to add a few extra's so you can actually save images (which the tutorial doesn't cover).
I added an extra notification called #"tapAndHoldShortNotification" after 0.3 seconds which calls a method with just the disable callout code in it (to prevent both the default and your own menu popping while the page is still loading, a little bug fix).
Also to detect images you'll need to extend the JSTools.js, here's mine with the extra functions.
function MyAppGetHTMLElementsAtPoint(x,y) {
var tags = ",";
var e = document.elementFromPoint(x,y);
while (e) {
if (e.tagName) {
tags += e.tagName + ',';
}
e = e.parentNode;
}
return tags;
}
function MyAppGetLinkSRCAtPoint(x,y) {
var tags = "";
var e = document.elementFromPoint(x,y);
while (e) {
if (e.src) {
tags += e.src;
break;
}
e = e.parentNode;
}
return tags;
}
function MyAppGetLinkHREFAtPoint(x,y) {
var tags = "";
var e = document.elementFromPoint(x,y);
while (e) {
if (e.href) {
tags += e.href;
break;
}
e = e.parentNode;
}
return tags;
}
Now you can detect the user clicking on images and actually find out the images url they are clicking on, but we need to change the -(void)openContextualMenuAtPoint: method to provide extra options.
Again here's mine (I tried to copy Safari's behaviour for this):
- (void)openContextualMenuAt:(CGPoint)pt{
// Load the JavaScript code from the Resources and inject it into the web page
NSString *path = [[NSBundle mainBundle] pathForResource:#"JSTools" ofType:#"js"];
NSString *jsCode = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
[webView stringByEvaluatingJavaScriptFromString:jsCode];
// get the Tags at the touch location
NSString *tags = [webView stringByEvaluatingJavaScriptFromString:
[NSString stringWithFormat:#"MyAppGetHTMLElementsAtPoint(%i,%i);",(NSInteger)pt.x,(NSInteger)pt.y]];
NSString *tagsHREF = [webView stringByEvaluatingJavaScriptFromString:
[NSString stringWithFormat:#"MyAppGetLinkHREFAtPoint(%i,%i);",(NSInteger)pt.x,(NSInteger)pt.y]];
NSString *tagsSRC = [webView stringByEvaluatingJavaScriptFromString:
[NSString stringWithFormat:#"MyAppGetLinkSRCAtPoint(%i,%i);",(NSInteger)pt.x,(NSInteger)pt.y]];
UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];
selectedLinkURL = #"";
selectedImageURL = #"";
// If an image was touched, add image-related buttons.
if ([tags rangeOfString:#",IMG,"].location != NSNotFound) {
selectedImageURL = tagsSRC;
if (sheet.title == nil) {
sheet.title = tagsSRC;
}
[sheet addButtonWithTitle:#"Save Image"];
[sheet addButtonWithTitle:#"Copy Image"];
}
// If a link is pressed add image buttons.
if ([tags rangeOfString:#",A,"].location != NSNotFound){
selectedLinkURL = tagsHREF;
sheet.title = tagsHREF;
[sheet addButtonWithTitle:#"Open"];
[sheet addButtonWithTitle:#"Copy"];
}
if (sheet.numberOfButtons > 0) {
[sheet addButtonWithTitle:#"Cancel"];
sheet.cancelButtonIndex = (sheet.numberOfButtons-1);
[sheet showInView:webView];
}
[selectedLinkURL retain];
[selectedImageURL retain];
[sheet release];
}
(NOTES: selectedLinkURL and selectedImageURL are declared in the .h file to let them be accessed throughout the class, for saving or opening the link latter.
So far we've just been going back over the tutorials code making changes but now we will move into what the tutorial doesn't cover (it stops before actually mentioning how to handle saving the images or opening the links).
To handle the users choice we now need to add the actionSheet:clickedButtonAtIndex: method.
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
if ([[actionSheet buttonTitleAtIndex:buttonIndex] isEqualToString:#"Open"]){
[webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:selectedLinkURL]]];
}
else if ([[actionSheet buttonTitleAtIndex:buttonIndex] isEqualToString:#"Copy"]){
[[UIPasteboard generalPasteboard] setString:selectedLinkURL];
}
else if ([[actionSheet buttonTitleAtIndex:buttonIndex] isEqualToString:#"Copy Image"]){
[[UIPasteboard generalPasteboard] setString:selectedImageURL];
}
else if ([[actionSheet buttonTitleAtIndex:buttonIndex] isEqualToString:#"Save Image"]){
NSOperationQueue *queue = [NSOperationQueue new];
NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:#selector(saveImageURL:) object:selectedImageURL];
[queue addOperation:operation];
[operation release];
}
}
This checks what the user wants to do and handles /most/ of them, only the "save image" operation needs another method to handle that. For the progress I used MBProgressHub.
Add an MBProgressHUB *progressHud; to the interface declaration in the .h and set it up in the init method (of whatever class you're handling the webview from).
progressHud = [[MBProgressHUD alloc] initWithView:self.view];
progressHud.customView = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:#"Tick.png"]] autorelease];
progressHud.opacity = 0.8;
[self.view addSubview:progressHud];
[progressHud hide:NO];
progressHud.userInteractionEnabled = NO;
And the -(void)saveImageURL:(NSString*)url; method will actually save it to the image library.
(A better way would be to do the download through an NSURLRequest and update the progress hud in MBProgressHUDModeDeterminate to deflect how long it'll actually take to download, but this is a more hacked together implementation then that)
-(void)saveImageURL:(NSString*)url{
[self performSelectorOnMainThread:#selector(showStartSaveAlert) withObject:nil waitUntilDone:YES];
UIImageWriteToSavedPhotosAlbum([UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:url]]], nil, nil, nil);
[self performSelectorOnMainThread:#selector(showFinishedSaveAlert) withObject:nil waitUntilDone:YES];
}
-(void)showStartSaveAlert{
progressHud.mode = MBProgressHUDModeIndeterminate;
progressHud.labelText = #"Saving Image...";
[progressHud show:YES];
}
-(void)showFinishedSaveAlert{
// Set custom view mode
progressHud.mode = MBProgressHUDModeCustomView;
progressHud.labelText = #"Completed";
[progressHud performSelector:#selector(hide:) withObject:[NSNumber numberWithBool:YES] afterDelay:0.5];
}
And of cause add [progressHud release]; to the dealloc method.
Hopefully this shows you how to add some of the options to a webView that apple left out.
Of cause though you can add more things to this like a "Read Later" option for instapaper or a "Open In Safari" button.
(looking at the length of this post I'm seeing why the original tutorial left out the finial implementation details)
Edit: (updated with more info)
I was asked about the detail I glossed over at the top, the #"tapAndHoldShortNotification", so this is clarifying it.
This is my UIWindow subclass, it adds the second notification to cancel the default selection menu (this is because when I tried the tutorial it showed both menus).
- (void)tapAndHoldAction:(NSTimer*)timer {
contextualMenuTimer = nil;
UIView* clickedView = [self hitTest:CGPointMake(tapLocation.x, tapLocation.y) withEvent:nil];
while (clickedView != nil) {
if ([clickedView isKindOfClass:[UIWebView class]]) {
break;
}
clickedView = clickedView.superview;
}
if (clickedView) {
NSDictionary *coord = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithFloat:tapLocation.x],#"x",
[NSNumber numberWithFloat:tapLocation.y],#"y",nil];
[[NSNotificationCenter defaultCenter] postNotificationName:#"TapAndHoldNotification" object:coord];
}
}
- (void)tapAndHoldActionShort:(NSTimer*)timer {
UIView* clickedView = [self hitTest:CGPointMake(tapLocation.x, tapLocation.y) withEvent:nil];
while (clickedView != nil) {
if ([clickedView isKindOfClass:[UIWebView class]]) {
break;
}
clickedView = clickedView.superview;
}
if (clickedView) {
NSDictionary *coord = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithFloat:tapLocation.x],#"x",
[NSNumber numberWithFloat:tapLocation.y],#"y",nil];
[[NSNotificationCenter defaultCenter] postNotificationName:#"TapAndHoldShortNotification" object:coord];
}
}
- (void)sendEvent:(UIEvent *)event {
NSSet *touches = [event touchesForWindow:self];
[touches retain];
[super sendEvent:event]; // Call super to make sure the event is processed as usual
if ([touches count] == 1) { // We're only interested in one-finger events
UITouch *touch = [touches anyObject];
switch ([touch phase]) {
case UITouchPhaseBegan: // A finger touched the screen
tapLocation = [touch locationInView:self];
[contextualMenuTimer invalidate];
contextualMenuTimer = [NSTimer scheduledTimerWithTimeInterval:0.8 target:self selector:#selector(tapAndHoldAction:) userInfo:nil repeats:NO];
NSTimer *myTimer;
myTimer = [NSTimer scheduledTimerWithTimeInterval:0.2 target:self selector:#selector(tapAndHoldActionShort:) userInfo:nil repeats:NO];
break;
case UITouchPhaseEnded:
case UITouchPhaseMoved:
case UITouchPhaseCancelled:
[contextualMenuTimer invalidate];
contextualMenuTimer = nil;
break;
}
} else { // Multiple fingers are touching the screen
[contextualMenuTimer invalidate];
contextualMenuTimer = nil;
}
[touches release];
}
The notification is then handled like this:
// in -viewDidLoad
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(stopSelection:) name:#"TapAndHoldShortNotification" object:nil];
- (void)stopSelection:(NSNotification*)notification{
[webView stringByEvaluatingJavaScriptFromString:#"document.documentElement.style.webkitTouchCallout='none';"];
}
It's only a little change but it fixes the annoying little bug where you get 2 menus appear (the standard one and yours).
Also you could easily add iPad support by sending the touches location as the notification fires and then showing the UIActionSheet from that point, though this was written before the iPad so doesn't include support for that.
After struggling for, like 2 or 3 days non-stop on this problem, it seems like the position is computed "relatively" to the UIWebView's "TOP-LEFT" corner (I am programing for iOS 7).
So, to make this work, when you get the position, on the controller where your WebView is (i'll put a snippet of my code below), don't add the "scroll-offset"
SNIPPET - ContextualMenuAction:
- (void)contextualMenuAction:(NSNotification*)notification {
// Load javascript
[self loadJavascript];
// Initialize the coordinates
CGPoint pt;
pt.x = [[[notification object] objectForKey:#"x"] floatValue];
pt.y = [[[notification object] objectForKey:#"y"] floatValue];
// Convert point from window to view coordinate system
pt = [self.WebView convertPoint:pt fromView:nil];
// Get PAGE and UIWEBVIEW dimensions
CGSize pageDimensions = [self.WebView documentSize];
CGSize webviewDimensions = self.WebView.frame.size;
/***** If the page is in MOBILE version *****/
if (webviewDimensions.width == pageDimensions.width) {
}
/***** If the page is in DESKTOP version *****/
else {
// convert point from view to HTML coordinate system
CGSize viewSize = [self.WebView frame].size;
// Contiens la portion de la page visible depuis la webview (en fonction du zoom)
CGSize windowSize = [self.WebView windowSize];
CGFloat factor = windowSize.width / viewSize.width;
CGFloat factorHeight = windowSize.height / viewSize.height;
NSLog(#"factor: %f", factor);
pt.x = pt.x * factor; // ** logically, we would add the offset **
pt.y = pt.y * factorHeight; // ** logically, we would add the offset **
}
NSLog(#"x: %f and y: %f", pt.x, pt.y);
NSLog(#"WINDOW: width: %f height: %f", [self.WebView windowSize].width, [self.WebView windowSize].height);
NSLog(#"DOCUMENT: width: %f height: %f", pageDimensions.width, pageDimensions.height);
[self openContextualMenuAt:pt];
}
SNIPPET - in openContextualMenuAt:
To load the correct JS function:
- (void)openContextualMenuAt:(CGPoint)pt {
// Load javascript
[self loadJavascript];
// get the Tags at the touch location
NSString *tags = [self.WebView stringByEvaluatingJavaScriptFromString:[NSString stringWithFormat:#"getHTMLTagsAtPoint(%li,%li);",(long)pt.x,(long)pt.y]];
...
}
SNIPPET - in JSTools.js:
This is the function I use to get the element touched
function getHTMLTagsAtPoint(x,y) {
var tags = ",";
var element = document.elementFromPoint(x,y);
while (element) {
if (element.tagName) {
tags += element.tagName + ',';
}
element = element.parentNode;
}
return tags;
}
SNIPPET - loadJavascript
I use this one to inject my JS code in the webview
-(void)loadJavascript {
[self.WebView stringByEvaluatingJavaScriptFromString:
[NSString stringWithContentsOfFile:[[NSBundle mainBundle] pathForResource:#"JSTools" ofType:#"js"] encoding:NSUTF8StringEncoding error:nil]];
}
This part (everything I did to overrride the default UIActionSheet) is HEAVILY (should I say completely) based on
this post
#Freerunning's answer is complete (i did almost everything he said in my other classes, like on the post my code is based on), the snippets i posted is just to show you more "completely" how my code is.
Hope this helps! ^^
First of all thanks to Freerunnering for the great solution!
But you can do this with an UILongPressGestureRecognizer instead of a custom LongPressRecognizer. This makes things a bit easier to implement:
In the Viewcontroller Containing the webView:
Add UIGestureRecognizerDelegate to your ViewController
let mainJavascript = "function MyAppGetHTMLElementsAtPoint(x,y) { var tags = \",\"; var e = document.elementFromPoint(x,y); while (e) { if (e.tagName) { tags += e.tagName + ','; } e = e.parentNode; } return tags; } function MyAppGetLinkSRCAtPoint(x,y) { var tags = \"\"; var e = document.elementFromPoint(x,y); while (e) { if (e.src) { tags += e.src; break; } e = e.parentNode; } return tags; } function MyAppGetLinkHREFAtPoint(x,y) { var tags = \"\"; var e = document.elementFromPoint(x,y); while (e) { if (e.href) { tags += e.href; break; } e = e.parentNode; } return tags; }"
func viewDidLoad() {
...
let longPressRecognizer = UILongPressGestureRecognizer(target: self, action: #selector(CustomViewController.longPressRecognizerAction(_:)))
self.webView.scrollView.addGestureRecognizer(longPressRecognizer)
longPressRecognizer.delegate = self
...
}
func longPressRecognizerAction(sender: UILongPressGestureRecognizer) {
if sender.state == UIGestureRecognizerState.Began {
let tapPostion = sender.locationInView(self.webView)
let tags = self.webView.stringByEvaluatingJavaScriptFromString("MyAppGetHTMLElementsAtPoint(\(tapPostion.x),\(tapPostion.y));")
let href = self.webView.stringByEvaluatingJavaScriptFromString("MyAppGetLinkHREFAtPoint(\(tapPostion.x),\(tapPostion.y));")
let src = self.webView.stringByEvaluatingJavaScriptFromString("MyAppGetLinkSRCAtPoint(\(tapPostion.x),\(tapPostion.y));")
print("tags: \(tags)\nhref: \(href)\nsrc: \(src)")
// handle the results, for example with an UIDocumentInteractionController
}
}
// Without this function, the customLongPressRecognizer would be replaced by the original UIWebView LongPressRecognizer
func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
return true
}
And thats it!
I've used a recipe from the iPhone Developer's Cookbook called ModalAlert in order to get some text from a user; however, when the alert is shown, the keyboard and buttons are frozen. Here is the code for the modal alert.
+(NSString *) textQueryWith: (NSString *)question prompt: (NSString *)prompt button1: (NSString *)button1 button2:(NSString *) button2
{
// Create alert
CFRunLoopRef currentLoop = CFRunLoopGetCurrent();
ModalAlertDelegate *madelegate = [[ModalAlertDelegate alloc] initWithRunLoop:currentLoop];
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:question message:#"\n" delegate:madelegate cancelButtonTitle:button1 otherButtonTitles:button2, nil];
// Build text field
UITextField *tf = [[UITextField alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 260.0f, 30.0f)];
tf.borderStyle = UITextBorderStyleRoundedRect;
tf.tag = TEXT_FIELD_TAG;
tf.placeholder = prompt;
tf.clearButtonMode = UITextFieldViewModeWhileEditing;
tf.keyboardType = UIKeyboardTypeAlphabet;
tf.keyboardAppearance = UIKeyboardAppearanceAlert;
tf.autocapitalizationType = UITextAutocapitalizationTypeWords;
tf.autocorrectionType = UITextAutocorrectionTypeNo;
tf.contentVerticalAlignment = UIControlContentVerticalAlignmentCenter;
// Show alert and wait for it to finish displaying
[alertView show];
while (CGRectEqualToRect(alertView.bounds, CGRectZero));
// Find the center for the text field and add it
CGRect bounds = alertView.bounds;
tf.center = CGPointMake(bounds.size.width / 2.0f, bounds.size.height / 2.0f - 10.0f);
[alertView addSubview:tf];
[tf release];
// Set the field to first responder and move it into place
[madelegate performSelector:#selector(moveAlert:) withObject:alertView afterDelay: 0.7f];
// Start the run loop
CFRunLoopRun();
// Retrieve the user choices
NSUInteger index = madelegate.index;
NSString *answer = [[madelegate.text copy] autorelease];
if (index == 0) answer = nil; // assumes cancel in position 0
[alertView release];
[madelegate release];
return answer;
}
Thanks!
You should probably check whether a UITextField's userInteractionEnabled property defaults to YES or NO.
// Put the modal alert inside a new thread. This happened to me before, and this is how i fixed it.
- (void)SomeMethod {
[NSThread detachNewThreadSelector:#selector(CheckCurrentPuzzle) toTarget:self withObject:nil]; }
-(void) CheckCurrentPuzzle {
NSAutoreleasePool *pool2 = [[NSAutoreleasePool alloc] init];
// code that should be run in the new thread goes here
if ([gameBoard AreAllCellsFilled]) {
if ([gameBoard FilledWithoutWin]) {
//only show this message once per puzzle
if (![currentPuzzle showedRemovalMessage]) {
NSArray *buttons = [NSArray arrayWithObject:#"Yes"];
if ([ModalAlert ask:#"blah blah blah" withTitle:#"Incomplete Puzzle" withCancel:#"No" withButtons:buttons] == 1) {
NSLog(#"Remove The Incorrect Cells");
[gameBoard RemoveIncorrect];
} else {
[gameSounds.bloop2 play];
}
}
} else {
if ([gameBoard IsBoardComplete]) {
[self performSelectorOnMainThread:#selector(WINNER) withObject:nil waitUntilDone:false];
}
}
}
[pool2 release];
}
-(void) WINNER {
//ladies and gentleman we have a winner
}
I had a problem similar to this in my educational game QPlus. It bugged me because I had the "exact" same code in two related apps, and they did not have the bug. It turned out that the bug was because the selector method was not declared in the header file. I am working in Xcode 4.2.
Details below:
In .m:
tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(emailLabelPressed)];
tapRecognizer.numberOfTapsRequired = 1;
[aLabel addGestureRecognizer:tapRecognizer];
[aLabel setUserInteractionEnabled:YES];
And later in the .m:
(void)emailLabelPressed {
//details
}
That works just fine in the simulator, but on an actual device the email interface presented modally will not edit. You can send or save as draft but no editing.
Then add this to the .h file:
(void)emailLabelPressed;
And voila, it works on the device. Of course this was the difference with the related apps - they both had the method declared in the header file. I would classify this as an iOS bug, but being such a novice developer I wouldn't presume to know.
Based on this, you may want to verify that your selector method moveAlert: is declared in your header file.
Enjoy,
Damien