private let swipeUp: UISwipeGestureRecognizer = {
let swiper = UISwipeGestureRecognizer(target: self, action: #selector(movedUp))
swiper.direction = .up
return swiper
}()
private let swipeDown: UISwipeGestureRecognizer = {
let swiper = UISwipeGestureRecognizer(target: self, action: #selector(movedDown))
swiper.direction = .down
return swiper
}()
creating my swipeUp and swipeDown gesture recognizers
func movedUp(sender: UISwipeGestureRecognizer){
print("UP")
}
func movedDown(sender: UISwipeGestureRecognizer){
print("DOWN")
}
my functions to be called when the swipe is recieved
override func viewDidLoad() {
self.view.addGestureRecognizer(swipeUp)
self.view.addGestureRecognizer(swipeDown)
}
adding my gesture recognizers in viewDidLoad
my program runs, but nothing happens when i swipe, what am i doing wrong?
Thankyou everyone
Try this:
private lazy var swipeUp: UISwipeGestureRecognizer = {
let swiper = UISwipeGestureRecognizer(target: self, action: #selector(movedUp))
swiper.direction = .up
return swiper
}()
private lazy var swipeDown: UISwipeGestureRecognizer = {
let swiper = UISwipeGestureRecognizer(target: self, action: #selector(movedDown))
swiper.direction = .down
return swiper
}()
override func viewDidLoad()
{
super.viewDidLoad()
self.view.addGestureRecognizer(swipeUp)
self.view.addGestureRecognizer(swipeDown)
}
func movedUp(sender: UISwipeGestureRecognizer)
{
print("UP")
}
func movedDown(sender: UISwipeGestureRecognizer)
{
print("DOWN")
}
Have you tried func movedUp(sender: UIGestureRecognizer)
Related
I am using the following code snippet to add the gesture recogniser :
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(attachImage))
let longGesture = UILongPressGestureRecognizer(target: self, action: #selector(longPress))
tapGesture.numberOfTapsRequired = 1
cell.image.addGestureRecognizer(tapGesture)
cell.image.addGestureRecognizer(longGesture)
#objc func longPress(_ btn : UIButton) {
selectedImageIndex = btn.tag
}
#objc func attachImage(_ btn : UIButton) {
selectedImageIndex = btn.tag
}
I am getting the following error when I press the button
unrecognized selector sent to instance 0x2802ec000
Change the functions as follows
#objc func longPress(_ sender : UILongPressGestureRecognizer) {
if let btn = sender.view {
selectedImageIndex = btn.tag
}
}
#objc func attachImage(_ sender : UITapGestureRecognizer) {
if let btn = sender.view {
selectedImageIndex = btn.tag
}
}
And change gesture initialization as follows
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(attachImage(_:)))
let longGesture = UILongPressGestureRecognizer(target: self, action: #selector(longPress(_:)))
If you add gesture on imageView then you have to enable isUserInteractionEnabled.
imageView.isUserInteractionEnabled = true
And If you add gesture on UIButton then
#IBOutlet weak var button: UIButton!
override func viewDidLoad() {
let tapGesture = UITapGestureRecognizer(target: self, #selector (tapGestureActionHandler(_:))) //Tap function will call when user tap on button
let longGesture = UILongPressGestureRecognizer(target: self, #selector(longGestureActionHandler(_:))) //Long function will call when user long press on button.
tapGesture.numberOfTapsRequired = 1
button.addGestureRecognizer(tapGesture)
button.addGestureRecognizer(longGesture)
}
#objc func tapGestureActionHandler(_ gesture: UITapGestureRecognizer) {
print("Tap happend")
}
#objc func longGestureActionHandler(_ gesture: UILongPressGestureRecognizer) {
print("Long press")
}
Assume a UIView, ParentView, contains a subview, ChildView, and other subviews.
The UIViewController attaches a swipe gesture recognizer to ParentView.
Swipes on ChildView trigger this swipe handler.
Inside of ParentView's swipe handler, is there a way to detect if the swipe occurred on ChildView?
Per Josh's answer, here's the attempted code, which does not work:
class TestViewController: UIViewController {
#IBOutlet weak var targetView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
initSwipeGestures()
}
fileprivate func initSwipeGestures() {
let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(didViewSwipe))
let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(didViewSwipe))
let upSwipe = UISwipeGestureRecognizer(target: self, action: #selector(didViewSwipe))
let downSwipe = UISwipeGestureRecognizer(target: self, action: #selector(didViewSwipe))
leftSwipe.direction = .left
rightSwipe.direction = .right
upSwipe.direction = .up
downSwipe.direction = .down
view.addGestureRecognizer(leftSwipe)
view.addGestureRecognizer(rightSwipe)
view.addGestureRecognizer(upSwipe)
view.addGestureRecognizer(downSwipe)
}
func didViewSwipe(_ sender:UISwipeGestureRecognizer) {
let location = sender.location(in: view)
let touchedView = view.hitTest(location, with: nil)
// Ignore swipes if targetView was swiped
if touchedView == targetView {
print("YO YO YO")
}
}
}
You can use the UIView method hitTest(_ point: CGPoint, with event: UIEvent?) to get the subview under the gesture's location.
func swipe(_ recognizer: UISwipeGestureRecognizer)
{
let location = recognizer.location(in: self)
let touchedView = self.hitTest(location, with: nil)
}
xcode creates some warnings since I updated to 7.3.1: "No method declared with Objective-C selector ('nextPage')". I'm not sure what I need to do now. These are the two lines that produce the warning:
let leftSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))
let rightSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))
This is the entire VC code:
import Foundation
import UIKit
class VC1 : UIViewController {
class MyCustomNavigationController: UINavigationController {
override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
return (visibleViewController?.supportedInterfaceOrientations())!
}
override func shouldAutorotate() -> Bool {
return (visibleViewController?.shouldAutorotate())!
}
}
override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
return UIInterfaceOrientationMask.Portrait
}
override func shouldAutorotate() -> Bool {
return true
}
override func viewDidLoad() {
super.viewDidLoad()
func nextPage(sender:UISwipeGestureRecognizer) {
switch sender.direction {
case UISwipeGestureRecognizerDirection.Left:
print("SWIPED LEFT", terminator: "")
self.performSegueWithIdentifier("seg1", sender: nil)
default:
break
}
let leftSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))
let rightSwipe = UISwipeGestureRecognizer (target: self, action: Selector("nextPage"))
leftSwipe.direction = .Left
rightSwipe.direction = .Right
view.addGestureRecognizer(leftSwipe)
view.addGestureRecognizer(rightSwipe)
}
}
}
I found this when researching:
Selector("funcName") was changed to #selector(ClassName.funcName)
I imagine that "funcName" would be nextPage, but what do I have to set as ClassName?
Unfortunately, xcode doesn't provide any suggestions to fix this. Hope you can help. Thanks.
You need to put nextPage out of viewDidLoad() and then #selector(VC1.nextPage)
func nextPage(sender:UISwipeGestureRecognizer) {
switch sender.direction {
case UISwipeGestureRecognizerDirection.Left:
print("SWIPED LEFT", terminator: "")
self.performSegueWithIdentifier("seg1", sender: nil)
default:
break
}
}
override func viewDidLoad() {
super.viewDidLoad()
let leftSwipe = UISwipeGestureRecognizer (target: self, action: #selector(VC1.nextPage))
let rightSwipe = UISwipeGestureRecognizer (target: self, action: #selector(VC1.nextPage))
}
I have a view that contains a counter.
I have implemented two different gesture recognizers,
a UISwipeGesture to increase the count by one,
and a UIPanGesture in order to increase the count by multiple numbers every
time the user swipes up.
Both gestures work, but my problem is they don't work at the same time.
I want them to work alternatively, for example if I do small swipes the
counter should increase by one, and if I keep dragging upwards the counter
should increase by multiple numbers.
Here's part of my code:
```
override func viewDidLoad() {
super.viewDidLoad()
setupSwipeGestures()
setupPanGestures()
}
private func setupSwipeGestures() {
let swipeUp = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))
let swipeDown = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))
swipeUp.direction = .Up
swipeDown.direction = .Down
circleView.addGestureRecognizer(swipeUp)
circleView.addGestureRecognizer(swipeDown)
}
private func setupPanGestures() {
let panGesture = UIPanGestureRecognizer(target: self, action: Selector("handleThePan:"))
circleView.addGestureRecognizer(panGesture)
}
extension UIPanGestureRecognizer {
func isDown(circleView: UIView) -> Bool {
let velocity : CGPoint = velocityInView(circleView)
if velocity.y < 0 {
print("ex Gesture went up")
return false
} else {
print("ex Gesture went down")
return true
}
}
}
```
P.S: The methods "handleSwipe" and "handlePan" contain the logic of the counter.
A swipe and a pan gesture can not be recognized at the same time because a swipe gesture is just a special type of pan that has to be faster, short lived, and in one direction.
What you should do is setup the pan gestures to require the swipe gesture to fail before they can start. You will need to set each of the UISwipeGestureRecognizer to be a requireGestureRecognizerToFail on the UIPanGestureRecognizer
override func viewDidLoad() {
super.viewDidLoad()
let swipeGestures = setupSwipeGestures()
setupPanGestures(swipeGestures: swipeGestures)
}
private func setupSwipeGestures() -> [UISwipeGestureRecognizer] {
let swipeUp = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))
let swipeDown = UISwipeGestureRecognizer(target: self, action: Selector("handleSwipes:"))
swipeUp.direction = .Up
swipeDown.direction = .Down
circleView.addGestureRecognizer(swipeUp)
circleView.addGestureRecognizer(swipeDown)
return [swipeUp, swipeDown]
}
private func setupPanGestures(swipeGestures: [UISwipeGestureRecognizer]) {
let panGesture = UIPanGestureRecognizer(target: self, action: Selector("handleThePan:"))
for swipeGeature in swipeGestures {
panGesture.requireGestureRecognizerToFail(swipeGesture)
}
circleView.addGestureRecognizer(panGesture)
}
Swift 3
override func viewDidLoad() {
super.viewDidLoad()
let swipeGestures = setupSwipeGestures()
setupPanGestures(swipeGestures: swipeGestures)
}
private func setupSwipeGestures() -> [UISwipeGestureRecognizer] {
let swipeUp = UISwipeGestureRecognizer(target: self, action: #selector(self.handleSwipes))
let swipeDown = UISwipeGestureRecognizer(target: self, action: #selector(self.handleSwipes))
swipeUp.direction = .up
swipeDown.direction = .down
circleView.addGestureRecognizer(swipeUp)
circleView.addGestureRecognizer(swipeDown)
return [swipeUp, swipeDown]
}
private func setupPanGestures(swipeGestures: [UISwipeGestureRecognizer]) {
let panGesture = UIPanGestureRecognizer.init(target: self, action:#selector(self.handleThePanUp))
for swipeGesture in swipeGestures {
panGesture.require(toFail: swipeGesture)
}
circleView.addGestureRecognizer(panGesture)
}
How can I implement a swipe gesture to change view to and fro?
The best example I've seen so far is the Soundcloud application but I couldn't figure out how to make it work.
Compatible with Swift 5
override func viewDidLoad()
{
super.viewDidLoad()
let leftSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes(_:)))
let rightSwipe = UISwipeGestureRecognizer(target: self, action: #selector(handleSwipes(_:)))
leftSwipe.direction = .left
rightSwipe.direction = .right
view.addGestureRecognizer(leftSwipe)
view.addGestureRecognizer(rightSwipe)
}
#objc func handleSwipes(_ sender: UISwipeGestureRecognizer)
{
if sender.direction == .left
{
print("Swipe left")
// show the view from the right side
}
if sender.direction == .right
{
print("Swipe right")
// show the view from the left side
}
}
Use this code...
override func viewDidLoad() {
super.viewDidLoad()
var swipeRight = UISwipeGestureRecognizer(target: self, action: "respondToSwipeGesture:")
swipeRight.direction = UISwipeGestureRecognizerDirection.Right
self.view.addGestureRecognizer(swipeRight)
}
func respondToSwipeGesture(gesture: UIGestureRecognizer) {
if let swipeGesture = gesture as? UISwipeGestureRecognizer {
switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.Right:
println("Swiped right")
//change view controllers
let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let resultViewController = storyBoard.instantiateViewControllerWithIdentifier("StoryboardID") as ViewControllerName
self.presentViewController(resultViewController, animated:true, completion:nil)
default:
break
}
}
}
You can a UISwipeGestureRecognizer to your UIView and add to this gesture a target and an action to perform when the gesture occurs
var swipeGesture = UISwipeGestureRecognizer(target: self, action: "doSomething")
myView.addGestureRecognizer(swipeGesture)
func doSomething() {
// change your view's frame here if you want
}
This tutorial might be helpful to you: http://www.avocarrot.com/blog/implement-gesture-recognizers-swift/
Basically, you'll need to add a gesture recognizer to your view that listens for swipe gestures. Then when it detects a swipe, push to the next view.