tap gesture recognizer - which object was tapped

Question

I m new to gesture recognizers so maybe this question sounds silly  I m assigning tap gesture recognizers to a bunch of UIViews  In the method is it possible to find out which of them was tapped somehow or do I need to find it out using the point that was tapped on screen   for  NSUInteger i 0  i lt 42  i              float xMultiplier  i  6          float yMultiplier   i  6          float xPos xMultiplier imageWidth          float yPos 1 UA TOP WHITE UA TOP BAR HEIGHT yMultiplier imageHeight          UIView  greyRect   UIView alloc initWithFrame CGRectMake xPos  yPos  imageWidth  imageHeight             greyRect setBackgroundColor UA NAV CTRL COLOR            greyRect layer borderColor  UA NAV BAR COLOR CGColor           greyRect layer borderWidth 1 0f          greyRect userInteractionEnabled YES           greyGridArray addObject greyRect            self view addSubview greyRect           NSLog   greyGrid   i       i  greyRect              make them touchable         UITapGestureRecognizer  letterTapRecognizer     UITapGestureRecognizer alloc  initWithTarget self action  selector highlightLetter            letterTapRecognizer numberOfTapsRequired   1           greyRect addGestureRecognizer letterTapRecognizer

User · Answer

Swift 5  In my case I needed access to the UILabel that was clicked  so you could do this inside the gesture recognizer   let label UILabel   gesture view as  UILabel   The gesture view property contains the view of what was clicked  you can simply downcast it to what you know it is    IBAction func tapLabel gesture  UITapGestureRecognizer             let label UILabel   gesture view as  UILabel          guard let text   label attributedText  string else               return                    print text      So you could do something like above for the tapLabel function and in viewDidLoad put      lt Label gt  addGestureRecognizer UITapGestureRecognizer target self  action   selector tapLabel gesture        Just replace  lt Label gt  with your actual label name

User · Answer

you can use   -  void highlightLetter  UITapGestureRecognizer  sender        UIView  view   sender view        NSLog    d   view tag        view will be the Object in which the tap gesture was recognised

User · Answer

Use this code in Swift  func tappGeastureAction sender  AnyObject        if let tap   sender as  UITapGestureRecognizer           let point   tap locationInView locatedView          if filterView pointInside point  withEvent  nil     true                  write your stuff here

User · Answer

You can also use  shouldReceiveTouch  method of UIGestureRecognizer  -  BOOL gestureRecognizer  UIGestureRecognizer   gestureRecognizer shouldReceiveTouch       UITouch   touch        UIView  view   touch view        NSLog    d   view tag            Dont forget to set delegate of your gesture recognizer

User · Answer

in swift it quite simple   Write this code in ViewDidLoad   function  let tap   UITapGestureRecognizer target  self  action   selector tapHandler gesture         tap numberOfTapsRequired   2     tapView addGestureRecognizer tap    The Handler Part this could be in viewDidLoad or outside the viewDidLoad  batter is put in extension   objc func tapHandler gesture  UITapGestureRecognizer        currentGestureStates text    Double Tap       here i m just testing the code by printing the output  if you want to make an action you can do whatever you want  or more practise and read

User · Answer

func tabGesture Call        let tapRec   UITapGestureRecognizer target  self  action   handleTap         tapRec delegate   self      self view addGestureRecognizer tapRec         where we want to gesture like  view  label etc    func handleTap sender  UITapGestureRecognizer          NSLog  Touch             handling code

User · Answer

Define your target selector highlightLetter   with argument as  UITapGestureRecognizer  letterTapRecognizer     UITapGestureRecognizer alloc  initWithTarget self action  selector highlightLetter       Then you can get view by  -  void highlightLetter  UITapGestureRecognizer  sender        UIView  view   sender view        NSLog    d   view tag    By tag  you can find out where you had tapped

User · Answer

Here is an update for Swift 3 and an addition to Mani s answer  I would suggest using sender view in combination with tagging UIViews  or other elements  depending on what you are trying to track  for a somewhat more  advanced  approach    Adding the UITapGestureRecognizer to e g  an UIButton  you can add this to UIViews etc  as well  Or a whole bunch of items in an array with a for-loop and a second array for the tap gestures        let yourTapEvent   UITapGestureRecognizer target  self  action   selector yourController yourFunction        yourObject addGestureRecognizer yourTapEvent     adding the gesture to your object    Defining the function in the same testController  that s the name of your View Controller   We are going to use tags here - tags are Int IDs  which you can add to your UIView with yourButton tag   1  If you have a dynamic list of elements like an array you can make a for-loop  which iterates through your array and adds a tag  which increases incrementally  func yourFunction   sender  AnyObject        let yourTag   sender view  tag    this is the tag of your gesture s object        do whatever you want from here    e g  if you have an array of buttons instead of just 1      for button in buttonsArray         if button tag    yourTag               do something with your button                    The reason for all of this is because you cannot pass further arguments for yourFunction when using it in conjunction with  selector    If you have an even more complex UI structure and you want to get the parent s tag of the item attached to your tap gesture you can use let yourAdvancedTag   sender view  superview  tag e g  getting the UIView s tag of a pressed button inside that UIView  can be useful for thumbnail button lists etc

User · Answer

You should amend creation of the gesture recogniser to accept parameter  add colon       UITapGestureRecognizer  letterTapRecognizer     UITapGestureRecognizer alloc  initWithTarget self action  selector highlightLetter       And in your method highlightLetter  you can access the view attached to recogniser   - IBAction  highlightLetter  UITapGestureRecognizer  recognizer       UIView  view    recognizer view

User · Answer

Typical 2019 example  Say you have a FaceView which is some sort of image  You re going to have many of them on screen  or  in a collection view  table  stack view or other list    In the class FaceView you will need a variable  index    class FaceView  UIView      var index  Int   so that each FaceView can be self-aware of  which  face it is on screen   So you must add var index  Int to the class in question   So you are adding many FaceView to your screen      let f   FaceView   f index   73    you add f to your stack view  screen  or whatever    You now add a click to f  f addGestureRecognizer UITapGestureRecognizer target  self                             action   selector tapOneOfTheFaces      Here s the secret    objc func tapOneOfTheFaces   sender  UITapGestureRecognizer        if let tapped   sender view as  CirclePerson           print  we got it    tapped index      You now know  which  face was clicked in your table  screen  stack view or whatever   It s that easy

User · Answer

If you are adding different UIGestureRecognizer on different UIViews and want to distinguish in the action method then you can check the property view in the sender parameter which will give you the sender view

User · Answer

Its been a year asking this question but still for someone   While declaring the UITapGestureRecognizer on a particular view assign the tag as  UITapGestureRecognizer  tapRecognizer     UITapGestureRecognizer alloc  initWithTarget self action  selector gestureHandlerMethod      yourGestureEnableView addGestureRecognizer tapRecognizer   yourGestureEnableView tag 2    and in your handler do like this  - void gestureHandlerMethod  UITapGestureRecognizer  sender       if sender view tag    2               do something here

[ios] tap gesture recognizer - which object was tapped?

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