UILongPressGestureRecognizer access the button being clicked - ios

Question

I set one UILongPressGestureRecognizer to handle four different buttons in my view, how do I access which button is being clicked in my code?
My UILongPressGestureRecognizer looks like it:
#IBAction func editText(sender: UILongPressGestureRecognizer) {
textFieldInput.hidden = false
iphoneSaveCharName.hidden = false
}
And I Want to use Long Press so that I can edit the button text
EDIT 1:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var iphoneTableView: UITableView!
#IBOutlet weak var textFieldInput: UITextField!
#IBOutlet weak var iphoneSaveCharName: UIButton!
#IBOutlet weak var charOne: UILabel!
#IBOutlet weak var charTwo: UILabel!
#IBOutlet weak var charTree: UILabel!
#IBOutlet weak var charFour: UILabel!
#IBOutlet weak var test1: UIButton! //button that I am clicking on!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//Function I made so I can save the user input
#IBAction func iphoneSaveTextInput(sender: UIButton) {
let textData = textFieldInput.text
textFieldInput.hidden = true
iphoneSaveCharName.hidden = true
charTwo.text = textData
}
// This is the LongPress Action
#IBAction func editText(sender: UILongPressGestureRecognizer) {
textFieldInput.hidden = false
iphoneSaveCharName.hidden = false
func longPressMethod(gesture: UILongPressGestureRecognizer) {
println(gesture.view)
if gesture.view is UIButton {
let test1 = gesture.view as UIButton
println(test1)
}
}
}
}
Edit 2: Layout
Edit 3: New ViewController
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var iphoneTableView: UITableView!
#IBOutlet weak var textFieldInput: UITextField!
#IBOutlet weak var iphoneSaveCharName: UIButton!
#IBOutlet weak var charOne: UIButton!
#IBOutlet weak var charTwo: UIButton!
#IBOutlet weak var charThree: UIButton!
#IBOutlet weak var charFour: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func iphoneSaveTextInput(sender: UIButton) -> Void{
let textData = textFieldInput.text
textFieldInput.hidden = true
iphoneSaveCharName.hidden = true
}
#IBAction func editText(sender: AnyObject) {
if sender is UILongPressGestureRecognizer &&
sender.state == UIGestureRecognizerState.Began {
textFieldInput.hidden = false
iphoneSaveCharName.hidden = false
// func iphoneSaveTextInput(sender: UIButton){
// var textData = textFieldInput.text
// textFieldInput.hidden = true
// iphoneSaveCharName.hidden = true
//
// }
let button = sender.view as UIButton
println(button)
if button.tag == 1{
charOne.setTitle("textData", forState: .Normal)
} else if button.tag == 2{
charTwo.setTitle("textData2", forState: .Normal)
} else if button.tag == 3{
charThree.setTitle("textData3", forState: .Normal)
} else if button.tag == 4{
charFour.setTitle("textData4", forState: .Normal)
}
}
}
}
Answer:
This is the final view control:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var iphoneTableView: UITableView!
#IBOutlet weak var textFieldInput: UITextField!
#IBOutlet weak var iphoneSaveCharName: UIButton!
#IBOutlet weak var charOne: UIButton!
#IBOutlet weak var charTwo: UIButton!
#IBOutlet weak var charThree: UIButton!
#IBOutlet weak var charFour: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func iphoneSaveTextInput(sender: UIButton) -> Void{
let textData = textFieldInput.text
textFieldInput.hidden = true
iphoneSaveCharName.hidden = true
}
#IBAction func editText(sender: AnyObject) {
if sender is UILongPressGestureRecognizer &&
sender.state == UIGestureRecognizerState.Began {
textFieldInput.hidden = false
iphoneSaveCharName.hidden = false
// func iphoneSaveTextInput(sender: UIButton){
// var textData = textFieldInput.text
// textFieldInput.hidden = true
// iphoneSaveCharName.hidden = true
//
// }
let button = sender.view as UIButton
println(button)
if button.tag == 1{
charOne.setTitle("textData", forState: .Normal)
} else if button.tag == 2{
charTwo.setTitle("textData2", forState: .Normal)
} else if button.tag == 3{
charThree.setTitle("textData3", forState: .Normal)
} else if button.tag == 4{
charFour.setTitle("textData4", forState: .Normal)
}
}
}
}
I would mostly like to give you all a best answer since everybody helped me out! I had to create one Long Press for each button, otherwise code will get confused.

Answer 1

Your question has introduced me to a really cool feature, so thanks! :)
It turns out that if you attach a UILongPressGestureRecognizer to a UIButton in a storyboard and attach that button and gesture to an IBAction within your swift class, that IBAction method can recognize whether the touch is a tap or long press! Pretty cool, huh?
So first off, make sure that each UIButton has its own unique UILongPressGestureRecognizer; then you can edit your code like so, so that it's able to identify which button is being pressed and whether that press is either a simple tap or UILongPressGestureRecognizer:
// Connect both your button *and* its gestures to the
// `IBAction` method so that the function will be called
// no matter what kind of gesture it recognizes -- tap,
// long press, or otherwise.
#IBAction func buttonSelected(sender: AnyObject) {
// But to see if the gesture is a long press, you can
// simply check the sender's class and execute the code
// when the gesture begins.
if sender is UILongPressGestureRecognizer &&
sender.state == UIGestureRecognizerState.Began {
// These two lines are originally from your
// editText method
textFieldInput.hidden = false
iphoneSaveCharName.hidden = false
// Then to identify which button was long pressed you
// can check the sender's view, to see which button IBOutlet
// that gesture's view belongs to.
// Method #1:
let button = sender.view as UIButton
if button == thisButton {
} else if button == thatButton {
}
...
// Or you can check the gesture view's tag to see which
// button it belongs to (i.e. whichever button has a matching
// tag).
// Method #2:
let button = sender.view as UIButton
if button.tag == 1 {
} else if button.tag == 2 {
}
...
}
// Else if it's not a long press gesture, perform
// whatever action you'd like to accomplish during a
// normal button tap
else if !(sender is UILongPressGestureRecognizer) {
// These lines are originally from your
// iphoneSaveTextInput
let textData = textFieldInput.text
textFieldInput.hidden = true
iphoneSaveCharName.hidden = true
}
}
But if you want to continue to keep the UILongPressGestureRecognizer IBAction separate from the UIButton's IBAction (i.e. link the UIButtons to iphoneSaveTextInput: and your UILongPressGestureRecognizers to editText:), that should be OK too. Just keep your iphoneSaveTextInput: method as is, and update your editText: method like so:
// This is the LongPress Action
#IBAction func editText(sender: UILongPressGestureRecognizer) {
if sender.state == UIGestureRecognizerState.Began {
textFieldInput.hidden = false
iphoneSaveCharName.hidden = false
// Then to identify which button was long pressed you
// can check the sender's view, to see which button IBOutlet
// that gesture's view belongs to.
// Method #1:
let button = sender.view as UIButton
if button == thisButton {
} else if button == thatButton {
}
...
// Or you can check the gesture view's tag to see which
// button it belongs to (i.e. whichever button has a matching
// tag).
// Method #2:
let button = sender.view as UIButton
if button.tag == 1 {
} else if button.tag == 2 {
}
...
}
}

Answer 2

You don't want to use the same gesture recognizer across different views:
Can you attach a UIGestureRecognizer to multiple views?
The view property of the gesture recognizer is probably what you would want to check but you want different gesture recognizers for each view.
If you want, they could all be linked to the same selector, though, and you could access the incoming recognizer's view that way.

Answer 3

A general way to make a button have different actions based on how long you press it, looks like this (timer is a property),
#IBAction func buttonDown(sender: UIButton) { // connected to touchDown
timer = NSTimer.scheduledTimerWithTimeInterval(0.5, target: self, selector: "handleTimer", userInfo: sender, repeats: false)
}
#IBAction func buttonUp(sender: UIButton) { // connected to touchUpInside
if timer != nil {
timer.invalidate()
println("change view")
}
}
func handleTimer() {
var button = timer.userInfo as UIButton
timer = nil
button.setTitle("New Title", forState: .Normal)
}