I want to add an *UITapGestureRecognize*r to my UITextView, because I want to close a "Popup" where the TextView is in. So I want, that the method "hide" of the Popup class is called, when the T*extView* is tapped. I tried it like the following, but it isn't working for some reason:
UITapGestureRecognizer *gr = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(show)];
[gr setNumberOfTapsRequired:1];
[viewText addGestureRecognizer:gr];
I also don't want to create a Subclass for it, because I then would need to call the "parent"-method "hide".
Maybe you now a good solution for that problem.
Thank you in advance.
You shouldnt use UITapGestureRecognizer but use the UITextFieldDelegate.
You can read about it here:
http://developer.apple.com/library/ios/#DOCUMENTATION/UIKit/Reference/UITextViewDelegate_Protocol/Reference/UITextViewDelegate.html%23//apple_ref/doc/uid/TP40006897
You basicly need to add the
UITextViewDelegate to your .h file like that -
#interface MyViewController : UIViewController<UITextViewDelegate>
Then assign your controller as the delegate:
viewText.delegate =self;
Now use one of the delegation methods, maybe:
- (BOOL)textViewShouldBeginEditing:(UITextView *)textView{
// Do what you need to do...
}
Edit
Well I can think on 2 additional approaches:
You can wrap your textView inside a UIView and add the UITapGestureRecognizer to the view.
You can use :
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView:textView];
//Checks if the tap was inside the textview bounds
if (CGRectContainsPoint(textView.bounds, location)){
//do something
}
}
Good luck
Did you try to NSLog on show method? or did you even declare and write method "show" ? It should work and that's how I did on my text view.
P.S don't forget to release your gesture instance (gr) after you add on textview :D
I had major problems getting this working also but I had one stupid problem, user interaction was turned off in the visual editor. Hope this helps someone :)
Related
I currently am using a UIScrollView to work as a way of scrolling/ dragging the cursor/ marker of a graph that I am displaying on my app. I use scrollViewDidScroll, etc. to detect the contentoffset's position and manipulate what I display on the screen based on this position.
My question is if it is possible to also detect a user's single tap on the screen and get this tap's position (to then set the contentoffset to this position)?
I have read some tutorials that describe creating a subclass of a uiscrollview, but it seems like these subclasses will ONLY account for a single tap and not drags/scrolls also.
Does anyone have any insight on how I might be able to detect a user's single tap on my UIScrollView while still having its scrolling/ dragging capabilities?
Thank you in advance!
Use the following code for your scrollView object :
UITapGestureRecognizer *singleTapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(singleTap:)];
singleTapGestureRecognizer.numberOfTapsRequired = 1;
singleTapGestureRecognizer.enabled = YES;
singleTapGestureRecognizer.cancelsTouchesInView = NO;
[scrollView addGestureRecognizer:singleTapGestureRecognizer];
//[singleTapGestureRecognizer release]; Not needed in ARC-enabled Project
}
- (void)singleTap:(UITapGestureRecognizer *)gesture {
//handle taps
}
Swift 5
let scrollViewTapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(scrollViewTapped(_:)))
scrollViewTapGestureRecognizer.numberOfTapsRequired = 1
scrollViewTapGestureRecognizer.isEnabled = true
scrollViewTapGestureRecognizer.cancelsTouchesInView = false
scrollView.addGestureRecognizer(scrollViewTapGestureRecognizer)
#objc func scrollViewTapped(_ sender: UITapGestureRecognizer) {
print("UIScrollView was tapped.")
}
The first part of the question is pretty simple to get going. If you have a UIScrollView subclass, you can just add a touchesEnded override that looks like this:
-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
if ([touch tapCount] == 1) {
CGPoint location = [touch locationInView:self];
[self setContentOffset:location animated:YES];
}
}
In the case of the scroll view, the -locationInView for the touch will actually already have the ContentOffset added into it. What this code will do is scroll the scroll view so that the point the user touched is at the top-left of the view. This probably isn't what you want exactly, so you'll have to do things like add in an offset if you want the scroll to end up 10 pixels in, or you'd make another CGPoint with only the x value out of the location if your scroller isn't left-to-right.
This won't interfere with being able to actually do the scroll.
Have you looked into attaching UITapGestureRecognizer to the scrollView? I've attached a UITapGestureRecognizer to a UIScrollView and used –gestureRecognizerShouldBegin: and/or –gestureRecognizer:shouldRecognizeSimultaneouslyWithGestureRecognizer: to cancel the built in panning when a touch is desired.
I'm working on a photo Collage application. I want to perform an action on image view so any one can help me to solve my problem. when i pick image from photo library and shown on image view after when double click on image view i want to push or present a new view to crop this image .....so anyone tell me what i do to solve my problem...
Use a UIButton of type custom and put an image inside it. And you are done.
Add the Gesture for ImageView
UITapGestureRecognizer *sg=[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(HandleEvent)];
sg.numberOfTapsRequired=2;
[BottomBar addGestureRecognizer:sg];
[sg release];
and do your task here:
-(void)HandleEvent
{
// your task
}
Thanks
You should use a UIButton instead of an UIImageView. You can set its style to custom and then asign it an image. UIButton provides all the methods for double tap already built in.
If you are using UIImageView, make sure you use setUserInteractionEnabled:YES. Then you need to check your touches in touchesBegan, ended, (canceled).
You are set on using UIImageView, you will have to subclass UIImageView and override the touch methods you want to intercept. For example:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
// Call super to make sure you don't lose any functionality
[super touchesBegan:touches withEvent:event];
// Perform the actions you want to perform with the tap.
}
Using UIButtons as replacements for your UIImageViews is a great idea you can just drag a connection from each button to an outlet in your view controller and handle the action. You can set the background image on the buttons as you are doing currently with the UIImageViews. Set your button type to custom and you'll be good to g
If you are using UIImageView class ,first set setUserInteractionEnabled:YES . Then set UITapGestureRecognizer event to image view.
try this
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint locationPoint = [[touches anyObject] locationInView:self.view];
CGPoint viewPoint = [imageView convertPoint:locationPoint fromView:self.view];
if ([imageView pointInside:viewPoint withEvent:event]) {
//do something
}
}
Make a button, and clear its color. On the back of button, put your image view, so that your imageview seems to be visible and the button doesn't. Now attach event to the button.
My app has a custom UITableView. In the cellForRowAtIndexPath delegate method of its UIViewController I am instantiating custom UITableViewCell objects that contain multiple custom UILabels (actually a sub-class of OHAttributedLabel) as subviews of the content view.
I have tried setting userInteractionEnabled = YES on the label, then adding touch events in the view controller, but that isn't working.
Ideas?
Thanks
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [[event allTouches] anyObject];
if (CGRectContainsPoint([self.site frame], [touch locationInView:self.view])){
//do whatever you want
}
}
Or
UILabel *label = =[UILabel alloc]init];
label.userInteractionEnabled = YES;
UITapGestureRecognizer *tapGesture =
[[[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(labelTap)] autorelease];
[label addGestureRecognizer:tapGesture];
A UILabel isn't a UIControl so you won't get events on UIControlEventTouchUpInside or similar. Why not use a button instead? You can make it look exactly like a label.
Regardless you will probably need to set addTarget:action:forControlEvents: and tag on the UIButton in your cellForRowAtIndexPath: method. In that method, detect which cell's button was tapped by examining the tag value.
If you must use UILabel then you need to subclass it and intercept the touchesBegan/touchesEnded methods (inherited from UIResponder) to detect UIControlEventTouchUpInside yourself.
Problem in OHAttributedLabel. This label also handles tap on links. So for handle tap on any point of label (not just link) you must
self.textLabel.onlyCatchTouchesOnLinks = NO;
Where self.textLabel is your OHAttributedLabel.
And don't forget of userInteractionEnabled.
I don't know if it is the same problem but... I added a label and could not get it to recognize a touch, I eventually realised that it was because I was adding it as a subview, but its frame was outside its parent's frame, hence the touch heirarchy broke
I just had the problem with using static table cells for a settings table where I wanted the whole cell to trigger the first responder for the cell's textfield.
I ended up adding a transparent (custom, blank title) button behind the label (touch disabled) and textfield after not getting any touches using gesture recognizers. I think it should work in a more elegant way, but it solved the task for now and that limited purpose. (and you can just drag connect from the button's default action)
Bit ugly. Then again, it just describes the area behind the text field reacting to touch. Which was the intention after all. So maybe its just not that fancy.
Will keep it until I find the reason for the recognizers not firing.
you can use TTTAttributedLabel to instead it. it's very easy.
when you initial the UITableViewCell,you can delegate:TTTAttributedLabelDelegate
like :
#interface MyTableViewCell : UITableViewCell<TTTAttributedLabelDelegate>{
UILabel *nameLabel;
TTTAttributedLabel *valueLabel;
}
when you initial ,you could add link to label :
[valueLabel addLinkToPhoneNumber:valueStr withRange:NSMakeRange(0, valueStr.length)];
so,you could do anything you want:
- (void)attributedLabel:(TTTAttributedLabel *)label didSelectLinkWithPhoneNumber:(NSString *)phoneNumber{
//do anything you want.
}
I have a view with multiple subviews. When a user taps a subview, the subview expands in size to cover most of the screen, but some of the other subviews are still visible underneath.
I want my app to ignore touches on the other subviews when one of the subviews is "expanded" like this. Is there a simple way to achieve this? I can write code to handle this, but I was hoping there's a simpler built-in way.
Hope this help...
[[yourSuperView subviews]
makeObjectsPerformSelector:#selector(setUserInteractionEnabled:)
withObject:[NSNumber numberWithBool:FALSE]];
which will disable userInteraction of a view's immediate subviews..Then give userInteraction to the only view you wanted
yourTouchableView.setUserInteraction = TRUE;
EDIT:
It seems in iOS disabling userInteraction on a parent view doesn't disable userInteraction on its childs.. So the code above (I mean the one with makeObjectsPerformSelector:)will only work to disable userInteraction of a parent's immediate subviews..
See user madewulf's answer which recursively get all subviews and disable user interaction of all of them. Or if you need to disable userInteraction of this view in many places in the project, You can categorize UIView to add that feature.. Something like this will do..
#interface UIView (UserInteractionFeatures)
-(void)setRecursiveUserInteraction:(BOOL)value;
#end
#implementation UIView(UserInteractionFeatures)
-(void)setRecursiveUserInteraction:(BOOL)value{
self.userInteractionEnabled = value;
for (UIView *view in [self subviews]) {
[view setRecursiveUserInteraction:value];
}
}
#end
Now you can call
[yourSuperView setRecursiveUserInteraction:NO];
Also user #lxt's suggestion of adding an invisible view on top of all view's is one other way of doing it..
There are a couple of ways of doing this. You could iterate through all your other subviews and set userInteractionEnabled = NO, but this is less than ideal if you have lots of other views (you would, after all, have to subsequently renable them all).
The way I do this is to create an invisible UIView that's the size of the entire screen that 'blocks' all the touches from going to the other views. Sometimes this is literally invisible, other times I may set it to black with an alpha value of 0.3 or so.
When you expand your main subview to fill the screen you can add this 'blocking' UIView behind it (using insertSubview: belowSubview:). When you minimize your expanded subview you can remove the invisible UIView from your hierarchy.
So not quite built-in, but I think the simplest approach. Not sure if that was what you were thinking of already, hopefully it was of some help.
Beware of the code given as solution here by Krishnabhadra:
[[yourSuperView subviews]makeObjectsPerformSelector:#selector(setUserInteractionEnabled:) withObject:[NSNumber numberWithBool:FALSE]];
This will not work in all cases because [yourSuperView subviews] only gives the direct subviews of the superview. To make it work, you will have to iterate recursively on all subviews:
-(void) disableRecursivelyAllSubviews:(UIView *) theView
{
theView.userInteractionEnabled = NO;
for(UIView* subview in [theView subviews])
{
[self disableRecursivelyAllSubviews:subview];
}
}
-(void) disableAllSubviewsOf:(UIView *) theView
{
for(UIView* subview in [theView subviews])
{
[self disableRecursivelyAllSubviews:subview];
}
}
Now a call to disableAllSubviewsOf will do what you wanted to do.
If you have a deep stack of views, the solution by lxt is probably better.
I would do this by putting a custom transparent button with the same frame as the superView. And then on top of that button I would put view that should accept user touches.
Button will swallow all touches and views behind it wouldn't receive any touch events, but view on top of the button will receive touches normally.
Something like this:
- (void)disableTouchesOnView:(UIView *)view {
UIButton *ghostButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, view.frame.size.width, view.frame.size.height)];
[ghostButton setBackgroundColor:[UIColor clearColor]];
ghostButton.tag = 42; // Any random number. Use #define to avoid putting numbers in code.
[view addSubview:ghostButton];
}
And a method for enabling the parentView.
- (void)enableTouchesOnView:(UIView *)view {
[[view viewWithTag:42] removeFromSuperview];
}
So, to disable all views in the parentViev behind yourView, I would do this:
YourView *yourView = [[YourView alloc] initWithCustomInitializer];
// It is important to disable touches on the parent view before adding the top most view.
[self disableTouchesOnView:parentView];
[parentView addSubview:yourView];
Just parentView.UserInteractionEnabled = NO will do the work.
Parent view will disable user interaction on all the view's subviews. But enable it does not enable all subviews(by default UIImageView is not interactable). So an easy way is find the parent view and use the code above, and there is no need to iterate all subviews to perform a selector.
Add a TapGestureRecognizer to your "background view" (the translucent one which "grays out" your normal interface) and set it to "Cancels Touches In View", without adding an action.
let captureTaps = UITapGestureRecognizer()
captureTaps.cancelsTouchesInView = true
dimmedOverlay?.addGestureRecognizer(captureTaps)
I will give my 2 cents to this problem.
Iteratively run userInteractionEnabled = false it's one way.
Another way will be add a UIView like following.
EZEventEater.h
#import <UIKit/UIKit.h>
#interface EZEventEater : UIView
#end
EZEventEater.m
#import "EZEventEater.h"
#implementation EZEventEater
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
self.backgroundColor = [UIColor clearColor];
self.userInteractionEnabled = false;
}
return self;
}
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
//EZDEBUG(#"eater touched");
}
- (void) touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
}
- (void) touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
}
In your code you add the EZEventEater view to cover all the views that your may block the touch event.
Whenever you want to block the touch event to those views, simply call
eater.userInteractionEnabled = YES;
Hope this helpful.
In Swift 5, I achieved this behaviour by placing a view right on top(the highlighted one) and setting:
myView.isUserInteractionEnabled = true
This does not let the touches go through it, thus ignoring the taps.
For my app, I think it will be sufficient to disable navigation to other tabs of the app (for a limited duration, while I'm doing some processing):
self.tabBarController.view.userInteractionEnabled = NO;
Also, I disabled the current view controller--
self.view.userInteractionEnabled = NO;
(And, by the way, the recursive solutions proposed here had odd effects in my app. The disable seems to work fine, but the re-enable has odd effects-- some of the UI was not renabled).
Simple solution. Add a dummy gesture that does nothing. Make it reusable by adding it to an extension like this:
extension UIView {
func addNullGesture() {
let gesture = UITapGestureRecognizer(target: self,
action: #selector(nullGesture))
addGestureRecognizer(gesture)
}
#objc private func nullGesture() {}
}
setUserInteractionEnabled = NO on the view you want to disable
I had the same problem, but the above solutions did not help.
I then noticed that calling
super.touchesBegan(...) was the problem.
After removing this the event was only handled by the top-most view.
I hope this is of help to anybody.
I have a UIView with multiple text boxes. Now i have used delegates to change the responder from from text field to another. In this case my key board goes away when the user comes to last text field.
but now i want to hide my key board when the user touches UIView(touches any where on screen apart from text boxes). Can some one help me with this.
Thanks
Use resignFirstResponder in touchesBegan, like so:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch * touch = [touches anyObject];
if(touch.phase == UITouchPhaseBegan) {
[self.myTextField resignFirstResponder];
}
}
You may need to call this on multiple text fields if you're not sure where the focus is currently located; I haven't tested that case.
Additionally, in Interface Builder, you'll need to enable the "User Interaction Enabled" checkbox for the view, or programatically use:
myView.userInteractionEnabled = YES;
Just call this in your view controller when you want to hide the keyboard.
[self.view endEditing:NO];
I use
-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
if(touch.phase==UITouchPhaseBegan){
//find first response view
for (UIView *view in [self.view subviews]) {
if ([view isFirstResponder]) {
[view resignFirstResponder];
break;
}
}
}
}
According to Beginning iPhone Development, you draw a round rect button so that it covers your entire UI; the complete screen. Then go to the Layout menu and click Send to Back. Then in the inspector, change the button's type from round rect to Custom. Now add a touch up inside event to this button and attach it to a method which handles it. Within the body of this method, make sure you have the statements:
[myTextFieldOne resignFirstResponder];
[myTextFieldTwo resignFirstResponder];
Basically send the resignFirstResponder message to each of your text fields, or any field that can produce a keyboard.
I'm actually really new to the iPhone SDK. I don't know if this is the best method, but it works and it's what I learned from the aforementioned book. Hope it helps.
A super easy way to do this is working on what PCheese said.
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch * touch = [touches anyObject];
if(touch.phase == UITouchPhaseBegan) {
[self.view endEditing:YES];
}
}
I previously used [self.view endEditing:YES]; for a button event, but when combined with the previous answer it works a treat. Much easier, and you don't have to do anything else - just put it in your .m file. Also, this works with all (at least, as far as I have seen) text fields (works for UITextField and UITextView).
I know OP probably won't still need this but I just want to share it for others with the same problem.
Thanks Blaenk, I was trying to work out how to do this and didn't realise I could put a button in the background, nice trick! Here's my contribution (new to this site and to Cocoa Touch so it may not be the most robust code ever, but it's working so far...):
I call this method from the touchUpInside event on my UIButton:
-(void)closeKeyboard:(id)sender {
UIView *theFirstResponder = [self findFirstResponder];
if (theFirstResponder) {
[theFirstResponder resignFirstResponder];
}
}
Where this loop finds the firstResponder:
- (UIView *)findFirstResponder {
UIView *firstResponderView = nil;
for (UIView *view in [self entryFields]) {
if ([view isFirstResponder]) {
firstResponderView = view;
break;
}
}
return firstResponderView;
}
It is dependent on each of the UITextField controls in the view having a tag assigned to them (again, can do that in Interface Builder).
My two cents anyway, though i'd better give something back!
SO I agonized over this and I figured it out..
you don't need the other button or anything.
All you need to do is select "Files owner", in the inspector drag from its textField outlet (or whatever you named it) to your actual textfield (via whatever you named it) This will be in addition to whatever inputs you already had wired up.
and ofcourse in addition to the Control outlet (UIview changed to UIControl via inspector) to files owner via backgroundtouched...the first thing we all tried
it work for me
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[self.view endEditing:NO];
}
only need into self.view have an UItextField
http://objdev.com/2013/11/Dismissing-iOS-Keyboard-Self-View-EndEditing
The most appropriate way of solving this problem is using the following method:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
if(![touch.view isMemberOfClass:[UITextField class]]) {
[touch.view endEditing:YES];
}
}
Note: This does not work on UIScrollView instances.
Change the class UIView to class UIControl from the identify tab of inspector.
Add this:
- (IBAction)tabBackground:(id) sender;
to your .h file.
Add this to your .m file:
- (IBAction)tabBackgroup:(id) sender {
[nameField resignFirstRespnder];
[numberField resignFirstResponder];
}
Connect your tabBackground from the inspector, action received section to the UIView (which is an an UIControl) and you're good to go.
For swift 4.0
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch = touches.first
if touch?.phase == UITouchPhase.began {
touch?.view?.endEditing(true)
}
}