I have a uiview with multipe buttons and images on it. I drag that card kind of like a tinder interface.
I want to be able stop the user dragging the card at some points and allow them at others.
I tried disabling it but the way I was doing it disabled all user interaction with the whole view stopping the swiping but also stopping users hitting the button which I don't want to do (I only want to stop them swiping).
This is how I initiate the swipe:
let gestureBack = UIPanGestureRecognizer(target: self, action: Selector("wasDraggedBack:"))
backview.addGestureRecognizer(gestureBack)
This is how I incorrectly attempted to stop the swiping:
self.backview.userInteractionEnabled = true
How can I just stop the view from swiping without it affecting all the other buttons ect inside the view.
Thanks
yes for this there is a delegate method's for UIGestureRecognizer
u can set the delegate method like below
let gestureBack = UIPanGestureRecognizer(target: self, action: Selector("wasDraggedBack:"))
backview.addGestureRecognizer(gestureBack)
//set the delegate
gestureBack.delegate? = self
and also confirm to delegate like,
class ViewController: UIViewController,UIGestureRecognizerDelegate {
}
and finally use this delegate method to trigger action,
func gestureRecognizerShouldBegin(gestureRecognizer: UIGestureRecognizer) -> Bool {
//condition to recognise the gesture
return true; //or false
}
According to the docs, all UIGestureRecognizer
class objects has a enabled
property.
What it does is:
Disables a gesture recognizers so it does not receive touches. The default value is true. If you change this property to false while a gesture recognizer is currently recognizing a gesture, the gesture recognizer transitions to a cancelled state.
你可以做点什么,
gestureBack.enabled = false
TL;DR: You need to disable the gesture.
gesture.isEnabled = enabled
I have several view objects with gestures registered. The solution I have implemented is as follows.
/// Set other views interaction off except the selected view
/// Prevent the image accidentally taking over
private func setViewGestures(enabled: Bool, excludedView: UIView) {
for subview in view.subviews {
if subview == excludedView {
continue
}
// Disable gestures
if let gestures = subview.gestureRecognizers {
for gesture in gestures {
gesture.isEnabled = enabled
}
}
}
}
UIGestureRecognizerDelegate
function:func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
guard let gestureView = gestureRecognizer.view else {
return false
}
setViewGestures(enabled: false, excludedView: gestureView)
}
@objc func handlePan(_ gesture: UIPanGestureRecognizer) {
guard let gestureView = gesture.view else {
return
}
if gesture.state == .ended {
setViewGestures(enabled: true, excludedView: gestureView)
}
// Do gesture stuff
}
That's it. The gestures are disabled while a single one is active and re-enables the gestures once the gesture ends.
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