How can I detect the touch event of an UIImageView

Question

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

User · Answer

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

User · Answer

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

User · Answer

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

User · Answer

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   quot nameOfYourImage png quot      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  quot touchable image-looking bar button item quot  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

User · Answer

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

User · Answer

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

User · Answer

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   quot Touch event on view     quot    tappedView class       As said  the label tap is received

User · Answer

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

User · Answer

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

User · Answer

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

[ios] How can I detect the touch event of an UIImageView?

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