I have a ViewController with full of names, basically a contact list. When you touch one of the names, you will get a detail screen with informations: name, organization, building, phone number, email, etc. It uses a navigation controller, so you can go back to the phonebook.
I have a custom map in my application (basically a picture, with several layers and with a pin, that show you where you are on the picture). I would like to achieve that when someone touch the building UILabel it goes my MapViewController with some parameters. It's a simple UILabel, but contains useful information, something like 15/A building. I have the exact x,y coordinates for the buildings.
My main problem is that I don't really know how to set up the touch event on the UILabel and go to a new view controller, with parameters.
I guess I need to make in my mapviewcontroller new initiation methods to be able to get parameters and display them.
So to summarize: how can I navigate to an other view controller with touch event and how can I initiate that view controller with parameters. It's important that I can reach my map without any buildings parameters as well from my menu.
Any help appreciated.
Alternatively you can also add a hidden button over your label. This button will handle the touch event.
Use Tap gesture for it
UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(labelTapped)];
tapGestureRecognizer.numberOfTapsRequired = 1;
[myLabel addGestureRecognizer:tapGestureRecognizer];
myLabel.userInteractionEnabled = YES;
//Create a Tap Gesture and set it on your Label.
UILabel *yourLabel=[[UILabel alloc]initWithFrame:CGRectMake(0, 0, 320, 50)];
[yourLabel setTextColor:[UIColor blackColor]];
[yourLabel setTextAlignment:NSTextAlignmentCenter];
[yourLabel setText:#"Address"];
[self.view addSubview:yourLabel];
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:#selector(TapGestureRecognizerLabel:)];
[tap setNumberOfTouchesRequired:1];
[yourLabel addGestureRecognizer:tap];
-(void)TapGestureRecognizerLabel:(UIGestureRecognizer *)gestureRecognizer
{
[self.navigationController pushViewController:targetControllerObj animated:YES];
}
I am refactoring a ViewController that I have adopted and is creating UIViews in the controller code. I'd like to move it to a custom UIView but would like to handle the Gesture Recognizer in the controller.
I have an ItemViewController which has a custom UIView. Within the ItemController, I'd like to do something like:
ItemView *itemView = [[ItemView alloc] initWithFrame:CGRectMake(30.0f,_runningYPosition,100.0f, 50.0f)];
UITapGestureRecognizer *tapRecognizer2 = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(tapRecognized:)];
itemView.miHeaderLabel.tag = [item itemID];
[itemView.miHeaderLabel addGestureRecognizer: tapRecognizer2];
that references
- (void)tapRecognized:(id)sender
{
...
}
in ItemViewController (NOT in the custom view).
But it doesn't seem to work. Is it possible to add a GestureRecognizer to a label that is a property of a subview in a ViewController? Anything obvious I'm doing wrong?
You need to set userInteractionEnabled to YES on the label for it to accept touches (and therefore for the gesture to receive touches).
I am trying to add a tap recognizer to a UILabel programmatically. It is not working... I have searched and tried a millions things of stackoverflow, but I can't get it to work...
Here is my current code:
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(more:)];
[self.moreLabel setUserInteractionEnabled:YES];
[self.moreLabel addGestureRecognizer:tap];
- (void)more:(UITapGestureRecognizer *)sender {
NSLog(#"HIT?");
}
It will work if I add it to the top view but I don't want that ;) Any help is appreciated.
Solved using #Savitha comment:
Summary of answer: "The view I was trying to touch wasn't under another view so either using bringToFront or setting it correctly in IB was the answere."
Bring moreLabel to front.
[self.view bringViewToFront:self.moreLabel];
In my app I have this situation:
I have my main viewcontroller where I alloc a "flipwiecontroller" and add its view in this way
self.flipViewController.view.frame = CGRectMake (...);
[self.view addSubview:self.flipViewController.view];
and at this flipViewController I add some gesture (as pangesture, swipegesture and tapgesture for some control that I use on it)
when I press a button in this view I alloc another viewcontroller "paintingviewcontroller" in this way
[self.view addSubview:paintingViewController.view];
in this second view controller I have some buttons and another function, but when I try to do a swipegesture or a tapgesture it recognize the events of my "flipviewcontroller"
I don't understand, if I add a view controller over another viewcontroller, why gesture of flipviewcontroller are active yet?
thnaks
Maybe you are disabling userIntercation on the paintingViewController, then, it's events are sent to his superview.
Also you can use [UIView removeGestureRecognizer:UIGestureRecognizer] to remove gestures.
How did you add the gesture recognizers? They should be added to the view, not the window. Perhaps that's the issue.
In case you have something like this:
[self.view.window addGestureRecognizer:panGestureRecognizer];
You should change it to this:
[self.view addGestureRecognizer:panGestureRecognizer];
I have placed an image (UIImageView) on the navigation bar. Now I want to detect the touch event and want to handle the event. How can I do that?
In practical terms, don't do that.
Instead add a button with Custom style (no button graphics unless you specify images) over the UIImageView. Then attach whatever methods you want called to that.
You can use that technique for many cases where you really want some area of the screen to act as a button instead of messing with the Touch stuff.
A UIImageView is derived from a UIView which is derived from UIResponder so it's ready to handle touch events. You'll want to provide the touchesBegan, touchesMoved, and touchesEnded methods and they'll get called if the user taps the image. If all you want is a tap event, it's easier to just use a custom button with the image set as the button image. But if you want finer-grain control over taps, moves, etc. this is the way to go.
You'll also want to look at a few more things:
Override canBecomeFirstResponder and return YES to indicate that the view can become the focus of touch events (the default is NO).
Set the userInteractionEnabled property to YES. The default for UIViews is YES, but for UIImageViews is NO so you have to explicitly turn it on.
If you want to respond to multi-touch events (i.e. pinch, zoom, etc) you'll want to set multipleTouchEnabled to YES.
To add a touch event to a UIImageView, use the following in your .m file:
UITapGestureRecognizer *newTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(myTapMethod)];
[myImageView setUserInteractionEnabled:YES];
[myImageView addGestureRecognizer:newTap];
-(void)myTapMethod{
// Treat image tap
}
You can also add a UIGestureRecognizer. It does not require you to add an additional element in your view hierarchy, but still provides you will all the nicely written code for handling touch events with a fairly simple interface:
UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc]
initWithTarget:self action:#selector(handleSwipe:)];
swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
[imgView_ addGestureRecognizer:swipeRight];
[swipeRight release];
UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc]
initWithTarget:self action:#selector(handleSwipe:)];
swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
[imgView_ addGestureRecognizer:swipeLeft];
[swipeLeft release];
I've been on different threads on the past few hours trying to find a solution for my problem, to no avail. I see that many developers share this problem, and I think people here know about this. I have multiple images inside a UIScrollView, trying to get tap events on them.
I am not getting any events from an UIImangeView, but I do get an event from a similar UILable with very similar parameters I am setting to it. Under iOS 5.1.
I have already done the following:
set setUserInteractionEnabled to YES for both `UIImageView and parent
view .
set setMultipleTouchEnabled to YES for UIImageView.
Tried subclassing UIImageView, didn't help any.
Attaching some code below, in this code I initialize both a UIImageView and UILabel, the label works fine in terms of firing events. I tried keeping out irrelevant code.
UIImageView *single_view = [[UIImageView alloc]initWithFrame:CGRectMake(200, 200, 100, 100)];
single_view.image = img;
single_view.layer.zPosition = 4;
UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(singleTapGestureCaptured:)];
[single_view addGestureRecognizer:singleTap];
[single_view setMultipleTouchEnabled:YES];
[single_view setUserInteractionEnabled:YES];
[self.myScrollView addSubview:single_view];
self.myScrollView.userInteractionEnabled = YES;
UILabel *testLabel = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
testLabel.backgroundColor = [UIColor redColor];
[self.myScrollView addSubview:testLabel];
[testLabel addGestureRecognizer:singleTap];
[testLabel setMultipleTouchEnabled:YES];
[testLabel setUserInteractionEnabled:YES];
testLabel.layer.zPosition = 4;
And the method which handles the event:
- (void)singleTapGestureCaptured:(UITapGestureRecognizer *)gesture
{
UIView *tappedView = [gesture.view hitTest:[gesture locationInView:gesture.view] withEvent:nil];
NSLog(#"Touch event on view: %#", [tappedView class]);
}
As said, the label tap is received.
Instead of making a touchable UIImageView then placing it on the navbar, you should just create a UIBarButtonItem, which you make out of a UIImageView.
First make the image view:
UIImageView *yourImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"nameOfYourImage.png"]];
Then make the barbutton item out of your image view:
UIBarButtonItem *yourBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:yourImageView];
Then add the bar button item to your navigation bar:
self.navigationItem.rightBarButtonItem = yourBarButtonItem;
Remember that this code goes into the view controller which is inside a navigation controller viewcontroller array. So basically, this "touchable image-looking bar button item" will only appear in the navigation bar when this view controller when it's being shown. When you push another view controller, this navigation bar button item will disappear.
You might want to override the touchesBegan:withEvent: method of the UIView (or subclass) that contains your UIImageView subview.
Within this method, test if any of the UITouch touches fall inside the bounds of the UIImageView instance (let's say it is called imageView).
That is, does the CGPoint element [touch locationInView] intersect with with the CGRect element [imageView bounds]? Look into the function CGRectContainsPoint to run this test.
First, you should place an UIButton and then either you can add a background image for this button, or you need to place an UIImageView over the button.
Or:
You can add the tap gesture to a UIImageView so that get the click action when tap on the UIImageView.
For those of you looking for a Swift 4 solution to this answer, you can use the following to detect a touch event on a UIImageView.
let gestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(imageViewTapped))
imageView.addGestureRecognizer(gestureRecognizer)
imageView.isUserInteractionEnabled = true
You will then need to define your selector as follows:
#objc func imageViewTapped() {
// Image has been tapped
}
Add gesture on that view. Add an image into that view, and then it would be detecting a gesture on the image too. You could try with the delegate method of the touch event. Then in that case it also might be detecting.