How to add a touch event to a UIView

Question

How do I add a touch event to a UIView  I try   UIView  headerView      UIView alloc  initWithFrame CGRectMake 0  0  tableView bounds size width  nextY   autorelease    headerView addTarget self action  selector myEvent   forControlEvents UIControlEventTouchDown      ERROR MESSAGE  UIView may not respond to  -addTarget action forControlEvents     I don t want to create a subclass and overwrite  -  void touchesBegan  NSSet   touches withEvent  UIEvent   event

User · Answer

Swift 3  amp  Swift 4  import UIKit  extension UIView     func addTapGesture tapNumber  Int  target  Any  action  Selector        let tap   UITapGestureRecognizer target  target  action  action      tap numberOfTapsRequired   tapNumber     addGestureRecognizer tap      isUserInteractionEnabled   true         Use   yourView addTapGesture tapNumber  1  target  self  action   selector yourMethod

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Create a gesture recognizer  subclass   that will implement touch events  like touchesBegan  You can add it to the view after that   This way you ll use composition instead subclassing  which was the request

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Gesture Recognizers There are a number of commonly used touch events  or gestures  that you can be notified of when you add a Gesture Recognizer to your view  They following gesture types are supported by default   UITapGestureRecognizer    Tap  touching the screen briefly one or more times  UILongPressGestureRecognizer    Long touch  touching the screen for a long time  UIPanGestureRecognizer    Pan  moving your finger across the screen  UISwipeGestureRecognizer    Swipe  moving finger quickly  UIPinchGestureRecognizer    Pinch  moving two fingers together or apart - usually to zoom  UIRotationGestureRecognizer    Rotate  moving two fingers in a circular direction   In addition to these  you can also make your own custom gesture recognizer  Adding a Gesture in the Interface Builder Drag a gesture recognizer from the object library onto your view   Control drag from the gesture in the Document Outline to your View Controller code in order to make an Outlet and an Action   This should be set by default  but also make sure that User Action Enabled is set to true for your view   Adding a Gesture Programmatically To add a gesture programmatically  you  1  create a gesture recognizer   2  add it to a view  and  3  make a method that is called when the gesture is recognized  import UIKit class ViewController  UIViewController         IBOutlet weak var myView  UIView           override func viewDidLoad             super viewDidLoad                       1  create a gesture recognizer  tap gesture          let tapGesture   UITapGestureRecognizer target  self  action   selector handleTap sender                         2  add the gesture recognizer to a view         myView addGestureRecognizer tapGesture                    3  this method is called when a tap is recognized      objc func handleTap sender  UITapGestureRecognizer            print  quot tap quot            Notes  The sender parameter is optional  If you don t need a reference to the gesture then you can leave it out  If you do so  though  remove the  sender   after the action method name  The naming of the handleTap method was arbitrary  Name it whatever you want using action   selector someMethodName sender      More Examples You can study the gesture recognizers that I added to these views to see how they work   Here is the code for that project  import UIKit class ViewController  UIViewController             IBOutlet weak var tapView  UIView       IBOutlet weak var doubleTapView  UIView       IBOutlet weak var longPressView  UIView       IBOutlet weak var panView  UIView       IBOutlet weak var swipeView  UIView       IBOutlet weak var pinchView  UIView       IBOutlet weak var rotateView  UIView       IBOutlet weak var label  UILabel           override func viewDidLoad             super viewDidLoad                       Tap         let tapGesture   UITapGestureRecognizer target  self  action   selector handleTap           tapView addGestureRecognizer tapGesture                      Double Tap         let doubleTapGesture   UITapGestureRecognizer target  self  action   selector handleDoubleTap           doubleTapGesture numberOfTapsRequired   2         doubleTapView addGestureRecognizer doubleTapGesture                      Long Press         let longPressGesture   UILongPressGestureRecognizer target  self  action   selector handleLongPress gesture             longPressView addGestureRecognizer longPressGesture                      Pan         let panGesture   UIPanGestureRecognizer target  self  action   selector handlePan gesture             panView addGestureRecognizer panGesture                      Swipe  right and left          let swipeRightGesture   UISwipeGestureRecognizer target  self  action   selector handleSwipe gesture             let swipeLeftGesture   UISwipeGestureRecognizer target  self  action   selector handleSwipe gesture             swipeRightGesture direction   UISwipeGestureRecognizerDirection right         swipeLeftGesture direction   UISwipeGestureRecognizerDirection left         swipeView addGestureRecognizer swipeRightGesture          swipeView addGestureRecognizer swipeLeftGesture                      Pinch         let pinchGesture   UIPinchGestureRecognizer target  self  action   selector handlePinch gesture             pinchView addGestureRecognizer pinchGesture                      Rotate         let rotateGesture   UIRotationGestureRecognizer target  self  action   selector handleRotate gesture             rotateView addGestureRecognizer rotateGesture                             Tap action      objc func handleTap             label text    quot Tap recognized quot                      example task  change background color         if tapView backgroundColor    UIColor blue               tapView backgroundColor   UIColor red           else               tapView backgroundColor   UIColor blue                                      Double tap action      objc func handleDoubleTap             label text    quot Double tap recognized quot                      example task  change background color         if doubleTapView backgroundColor    UIColor yellow               doubleTapView backgroundColor   UIColor green           else               doubleTapView backgroundColor   UIColor yellow                             Long press action      objc func handleLongPress gesture  UILongPressGestureRecognizer            label text    quot Long press recognized quot                      example task  show an alert         if gesture state    UIGestureRecognizerState began               let alert   UIAlertController title   quot Long Press quot   message   quot Can I help you  quot   preferredStyle  UIAlertControllerStyle alert              alert addAction UIAlertAction title   quot OK quot   style  UIAlertActionStyle default  handler  nil               self present alert  animated  true  completion  nil                              Pan action      objc func handlePan gesture  UIPanGestureRecognizer            label text    quot Pan recognized quot                      example task  drag view         let location   gesture location in  view     root view         panView center   location                   Swipe action      objc func handleSwipe gesture  UISwipeGestureRecognizer            label text    quot Swipe recognized quot                      example task  animate view off screen         let originalLocation   swipeView center         if gesture direction    UISwipeGestureRecognizerDirection right               UIView animate withDuration  0 5  animations                    self swipeView center x    self view bounds width                completion     value  Bool  in                 self swipeView center   originalLocation                          else if gesture direction    UISwipeGestureRecognizerDirection left               UIView animate withDuration  0 5  animations                    self swipeView center x -  self view bounds width                completion     value  Bool  in                 self swipeView center   originalLocation                                            Pinch action      objc func handlePinch gesture  UIPinchGestureRecognizer            label text    quot Pinch recognized quot                   if gesture state    UIGestureRecognizerState changed               let transform   CGAffineTransform scaleX  gesture scale  y  gesture scale              pinchView transform   transform                             Rotate action      objc func handleRotate gesture  UIRotationGestureRecognizer            label text    quot Rotate recognized quot                   if gesture state    UIGestureRecognizerState changed               let transform   CGAffineTransform rotationAngle  gesture rotation              rotateView transform   transform                    Notes  You can add multiple gesture recognizers to a single view  For the sake of simplicity  though  I didn t do that  except for the swipe gesture   If you need to for your project  you should read the gesture recognizer documentation  It is fairly understandable and helpful  Known issues with my examples above   1  Pan view resets its frame on next gesture event   2  Swipe view comes from the wrong direction on the first swipe   These bugs in my examples should not affect your understanding of how Gestures Recognizers work  though

User · Answer

Here is ios tapgesture  First you need to create action for GestureRecognizer after write the below code under the action as shown below  -  IBAction tapgesture  id sender        password resignFirstResponder       username resignFirstResponder    NSLog    TapGestureRecognizer  tapped

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Based on the accepted answer you can define a macro    define handle tap view  delegate  selector  do        view userInteractionEnabled   YES        view addGestureRecognizer    UITapGestureRecognizer alloc  initWithTarget delegate action selector       while 0    This macro uses ARC  so there s no release call   Macro usage example   handle tap userpic  self   selector onTapUserpic

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Seems quite simple these days  This is the Swift version   let tap   UITapGestureRecognizer target  self  action   selector viewTapped       view addGestureRecognizer tap    objc func viewTapped recognizer  UIGestureRecognizer          Do what you need to do

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Why don t you guys try SSEventListener    You don t need to create any gesture recognizer and separate your logic apart to another method  SSEventListener supports setting listener blocks on a view to listen for single tap gesture  double tap gesture and N-tap gesture if you like  and long press gesture  Setting a single tap gesture listener becomes this way     view ss addTapViewEventListener   UITapGestureRecognizer  recognizer          numberOfTapsRequired 1

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Heres a Swift version      MARK  Gesture Extensions extension UIView        func addTapGesture  tapNumber  Int  target  AnyObject  action  Selector            let tap   UITapGestureRecognizer  target  target  action  action          tap numberOfTapsRequired   tapNumber         addGestureRecognizer tap          userInteractionEnabled   true            func addTapGesture  tapNumber  Int  action    UITapGestureRecognizer - gt                 let tap   BlockTap  tapCount  tapNumber  fingerCount  1  action  action          addGestureRecognizer tap          userInteractionEnabled   true

User · Answer

I think you can simply use   UIControl  headerView        headerView addTarget self action  selector myEvent   forControlEvents UIControlEventTouchDown     i mean headerView extends from UIControl

User · Answer

In iOS 3 2 and higher  you can use gesture recognizers  For example  this is how you would handle a tap event     The setup code  in viewDidLoad in your view controller  UITapGestureRecognizer  singleFingerTap        UITapGestureRecognizer alloc  initWithTarget self                                            action  selector handleSingleTap      self view addGestureRecognizer singleFingerTap      The event handling method -  void handleSingleTap  UITapGestureRecognizer   recognizer     CGPoint location    recognizer locationInView  recognizer view superview         Do stuff here        There are a bunch of built in gestures as well  Check out the docs for iOS event handling and UIGestureRecognizer  I also have a bunch of sample code up on github that might help

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You can achieve this by adding Gesture Recogniser in your code   Step 1  ViewController m      Declare the Gesture  UITapGestureRecognizer  gesRecognizer     UITapGestureRecognizer alloc                                             initWithTarget self                                            action  selector handleTap     gesRecognizer delegate   self      Add Gesture to your view   yourView addGestureRecognizer gesRecognizer      Step 2  ViewController m      Declare the Gesture Recogniser handler method  -  void handleTap  UITapGestureRecognizer   gestureRecognizer     NSLog   Tapped        NOTE  here yourView in my case was  property  strong  nonatomic  IBOutlet UIView  localView   EDIT   localView is the white box in Main storyboard from below

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Swift 3   let tapGestureRecognizer  UITapGestureRecognizer   UITapGestureRecognizer target  self  action   selector handleTapGestureRecognizer       view addGestureRecognizer tapGestureRecognizer   func handleTapGestureRecognizer   gestureRecognizer  UITapGestureRecognizer

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In Swift 4 2 and Xcode 10  Use UITapGestureRecognizer for to add touch event    Add tap gesture to your view let tap   UITapGestureRecognizer target  self  action   selector handleGesture   yourView addGestureRecognizer tap      GestureRecognizer  objc func handleGesture gesture  UITapGestureRecognizer  - gt  Void     Write your code here     If you want to use SharedClass    This is my shared class import UIKit  class SharedClass  NSObject        static let sharedInstance   SharedClass          Tap gesture function     func addTapGesture view  UIView  target  Any  action  Selector            let tap   UITapGestureRecognizer target  target  action  action          view addGestureRecognizer tap             I have 3 views in my ViewController called view1  view2 and view3   override func viewDidLoad         super viewDidLoad         Add gestures to your views     SharedClass sharedInstance addTapGesture view  view1  target  self  action   selector handleGesture       SharedClass sharedInstance addTapGesture view  view2  target  self  action   selector handleGesture       SharedClass sharedInstance addTapGesture view  view3  target  self  action   selector handleGesture2          GestureRecognizer  objc func handleGesture gesture  UITapGestureRecognizer  - gt  Void       print  printed 1 amp 2           GestureRecognizer  objc func handleGesture2 gesture  UITapGestureRecognizer  - gt  Void       print  printed3

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Objective-C   UIControl  headerView     UIControl alloc  initWithFrame CGRectMake 0  0  tableView bounds size width  nextY     headerView addTarget self action  selector myEvent   forControlEvents UIControlEventTouchDown     Swift   let headerView   UIControl frame  CGRect x  0  y  0  width  tableView bounds size width  height  nextY   headerView addTarget self  action   selector myEvent       for   touchDown    The question asks      How do I add a touch event to a UIView    It isn t asking for a tap event   Specifically OP wants to implement UIControlEventTouchDown  Switching the UIView to UIControl is the right answer here because Gesture Recognisers don t know anything about  touchDown   touchUpInside   touchUpOutside etc   Additionally  UIControl inherits from UIView so you re not losing any functionality   If all you want is a tap  then you can use the Gesture Recogniser  But if you want finer control  like this question asks for  you ll need UIControl   https   developer apple com documentation uikit uicontrol language objc https   developer apple com documentation uikit uigesturerecognizer language objc

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Another way is adding a transparent button to the view  UIButton  b    UIButton buttonWithType UIButtonTypeCustom   b frame   CGRectMake 0  0  headerView width  headerView height    headerView addSubview b    b addTarget self action  selector buttonClicked   forControlEvents UIControlEventTouchDown     And then  handle click    -  void buttonClicked  id sender

[ios] How to add a touch event to a UIView?

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