I want to do something when the focused voice-over element is being tapped again.
Function accessibilityElementDidBecomeFocused() will only get called when the element is focused for first time.
When we are again single tapping on the same focused element then this function won't get called. Can anybody suggest some solution?
Can anybody suggest some solution?
Here are some ideas on the fly to detect a single-tap on the same focused element:
Create a variable nbSelections that will count the number of single-taps.
Create a tap gesture recognizer on your element to increment the number of taps for instance:
let tap = UITapGestureRecognizer(target: self,
action: #selector(addTapCounter(info:)))
tap.numberOfTapsRequired = 1
self.addGestureRecognizer(tap)
Add the trait that will allow to catch the simple tap directly on the element:
override var accessibilityTraits: UIAccessibilityTraits {
get { return .allowsDirectInteraction }
set { }
}
Set nbSelections = 0 when the element loses the focus:
override open func accessibilityElementDidLoseFocus() { nbSelections = 0 }
Combining these ideas with the UIAccessibilityFocus informal protocol could be a good line of research to reach your goal.
However, this technical solution assumes that the single-tap is made directly on the element itself (-trait specific) and not anywhere else (I don't see how to catch this event the top off my head).
Related
I have observed MKMapView zoom-out on Double tap gesture, I didn't find any way to disable it. I tried to add own Double Tap Gesture to catch Double tap action but it still zoom out. Any thought?
There is no API to disable or change double-tap behavior with MKMapView.
But, if you really want to do so, one approach would be to find and remove the double-tap gesture recognizer from the MKMapView object.
In the project you shared, you could do that in makeUIView in your UIMapView class:
func makeUIView(context: UIViewRepresentableContext<UIMapView>) -> UIViewType {
self.configureView(mapView, context: context)
setRegion(to: palce)
if let v = mapView.subviews.first,
let ga1 = v.gestureRecognizers
{
let ga2: [UITapGestureRecognizer] = ga1.compactMap { $0 as? UITapGestureRecognizer } .filter { ($0.numberOfTapsRequired == 2) }
for g in ga2 {
v.removeGestureRecognizer(g)
}
}
return mapView
}
I wouldn't necessarily suggest that you do so, however.
Apple may change the MKMapView object in the future, which could then break this.
User's tend to prefer that common UI elements behave in expected ways.
Personally, I get rather annoyed when using an app and the developer has changed standard functionality of UI elements. For example, if I see a table view row with a disclosure indicator (the right-arrow / chevron), I expect that tapping the row will "push" to another screen related to that row. I've seen apps that do not follow that pattern, and it just gets confusing.
In my class I have 11 UITapGestureRecognizers in an array textViewRecognizer attached to 11 out of 100 UITextFields in an array boxArray. When a Textfield is tapped containing a UIGestureRecognizer it runs tappedTextView where I try to get the index of the first responder.
However, due to some weird ordering in how things are executed, the action function only gives me the first responder of the previous first responder to the one that was just tapped.
Also, I have to double tap to even select the text field I was going for! I need to use the tap function and not the text delegates so this has been a real headache.
I have...
#objc func tappedTextField(_ sender: UITapGestureRecognizer) {
for i in 0...99 {
if (boxArray[i]?.isFirstResponder)! {
if let index = boxArray.index(of: boxArray[i]) {
print(index)
break
}
}
}
}
in my viewDidLoad I have
for i in 0...10 {
textFieldTapRecognizer[i].addTarget(self, action: #selector(self.tappedTextField(_:)))
}
In my class I have
I want to set 11 out of 100 textFields to have this a tap recognizer depending on some conditions (I'm just going to use a regular for loop here)
for i in 0...10 {
boxArray[i]?.addGestureRecognizer(textFieldTapRecognizer[i])
}
Is there anyway I can get it to give me the actual first responder, after the tap was made?
Is there anyway to go around the double tap to select the text field that has a UITapGesture?
Any help is greatly appreciated.
Edited: properly named functions
It sounds like you want to remove the automatic editing behavior on a UITextView. You can grab more control over that with the textViewShouldBeginEditing(_ textView: UITextView) -> Bool UITextViewDelegate method, documented here.
If you return false for that method, this should avoid needing a double tap to get to your gesture recognizer. Depending on your use case, you can then "allow" the tap to go to the text view by returning true for the textView you want to be actually edited.
While I'm not 100% clear on the first responder part of your question, since the textView won't be grabbing first responder if it's not starting it's editing mode, this should address that concern I believe. Good luck!
I would add a Tag to my UITextView and set the UITextViewDelegate to my ViewController.
Then I would add the following Delegate method:
func textViewShouldBeginEditing(_ textView: UITextView) -> Bool {
print("Textview tag: ", textView.tag)
return false
}
I have received a bluetooth button which you can connect your program to, however the double click is not working for it. All the other events (up, down, click, hold) are working and calling the correct delegate.
I want somehow to manage double clicks from code.
How can I make it work, for example from the up event. (for example, if second click comes within 0.5s it behaves as a double click, if no then simple click)
this probably makes a 0.5s delay but thats acceptable...
devButton.addTarget(self, action: #selector(taps(_:event:)), for: UIControlEvents.touchDownRepeat)
func taps(_ sender: UIButton, event: UIEvent) {
let t: UITouch = event.allTouches!.first!
if (t.tapCount == 2) { devFunction() }
}
Connect your button to the VC and add a double click listener.
yourButton.addTarget(self, action: #selector(doubleTapped), for: .touchDownRepeat)
Then handle the double click event in a function like this
func doubleTapped() {
// do something cool here
}
I'm working on app for blind people first i needed to use swipe gesture and after search i can do it by using
override func accessibilityScroll( direction:
UIAccessibilityScrollDirection)-> Bool {
if direction == UIAccessibilityScrollDirection.Left
{
Do what you want to do
}
}
Now I need to use tap gesture and I can't find any function to use make custom tap in Accessibility can anyone help me pleasee!
Thanks
You shouldn't use tap gesture for UIAccessibility ot try to add tap gestures to UIAccessibility.UIAccessibility is meant for the UIElements where the people can see/hear what is on the screen. You cannot add UIAccessiility for tap gesture functions. What you can do is to post a accessibility notification to the user saying tap to perform something. Again, you need to use buttons to perform an action in UIAccessibility.
You can override accessibilityScroll method:
override func accessibilityScroll(_ direction:
UIAccessibilityScrollDirection) -> Bool {
super.accessibilityScroll(direction)
if direction == UIAccessibilityScrollDirection.left {
// do your stuff
}
if direction == UIAccessibilityScrollDirection.right {
// do your stuff
}
return true
}
So far I have a grid of buttons and have attached a pan gesture recognizer to the view. I can track the events and get the location of the finger as it moves but there doesn't seem to be the equivalent of a "mouseEnter" message to use to get info about or control properties (such as the highlighting) of the other buttons I pass over.
Am I missing something? How can I accomplish, say, highlighting the buttons under the users' fingers as they pan over them? Does cocoa touch support this or must something else be done?
Thanks.
You are right, there is no such event. Also UIButton events won't help you either, because those require to actually start gesture inside. What you can do instead is to get location of the point you are currently dragging:
func panDetected(sender : MoreInformativeGestureRecognizer) {
let touchPoint = sender.locationInView(self.view)
}
And now, when you have the point, you can iterate on all the buttons you have and check if the point is inside the button:
let buttons = [UIButton]
let lastActiveButton = UIButton?
...
// Iterate through all the buttons
for button in buttons {
// Check area of the button against your touch
if CGRectContainsPoint(button.frame, touchPoint) {
// You are inside the touch area of the button
// Here, you can for example perform some action if you want, store information
// about the button so you don't do it multiple times etc.. your call :)
self.lastActiveButton = button
}
}
This way you can detect then you go in and out and do whatever you want with events. Hope it helps!
UIButton inherits from UIControl which has a number of events
Have you tried that? You can add a listener to those events, either through nib/storyboard or through code (look under discussion to see how to do this)