i am trying to implement accessibility option in my book reader app. I have a slider(similar to ibooks) which is used for navigating between pages. i have seen this question posted by another user and implemented the same code in my app. Right now my slider is responding when i'm tapping on it. The voiceover is also speaking the label i have given in the code. But, the problem is that, i am unable to change the slider value and navigate to another page.. I dont know if it is the problem with my code or is it that i do not know how to replicate the gesture to change the value of the slider... Any help in this regard will be appreciated.... Thanku
Does the slider work with VoiceOver turned off?
If so, try swiping vertically up or down (top to bottom of display) after selecting the slider element with VoiceOver enabled.
Is it a UISlider, or something of your own devising? UISlider needs an actual vertical swipe once selected, and moves a pretty significant amount as a result — not a good experience for going to the next page.
If it's your own custom control, be sure you set UIAccessibilityTraitAdjustable.
Related
I've created a custom view that acts like a UISlider - there is a "track", and a handle to "grab" to change the value. For particular reasons, I can't just make it a subclass of UISlider. I'm trying to make this slider as accessible as possible with VoiceOver. I have accessibilityIncrease and accessibilityDecrease on my custom view that handle single finger drag up and single finger drag down. This changes the value of the slider by 10% at a time.
However, I'd like to allow more fine grained control, just like a non-VoiceOver slider. By default , UISlider has double tap and hold, and you can drag up/down to "pan" the slider. I'd like to add exactly that to my custom view, but I can't find the correct incantation to handle the double tap and hold gesture.
Is there something I can do to mimic the double tap and hold gesture from UISlider on my custom view?
Thanks very much!!!
If you want to implement this kind of new gesture for VoiceOver users, just forget it.
The recommended gesture for this kind of UI control is definitely the implementation of adjustable value as you already did apparently.
I don't think it's a good idea to try and implement new VoiceOver gestures in an application because its users have their habits and they may be totally lost with your customed control if they cannot handle it unless you add an hint to explain but that's definitely not what I recommend anyway.
Otherwise, you could take a look at the pass through concept introduced in the What's New in Accessibility WWDC 2017 video that deals with the same idea but for a panning gesture...
Im working in Swift and I am going to set up my view like this:
When the user swipes up, I want to animate the top image view and text so they move up WITH the swipe in the moments before the app is exited to go to Safari (the swipe gesture triggers opening a url).
I am trying to figure out the cleanest way to accomplish this - I am planning on simply animating up the image view using UIAnimations, however Im not sure the animation will go through all the way before the app is exited. Is there another way to achieve this effect?
I also need to know if it is possible to change the direction that the app "switches out" to Safari- by default, Safari comes in from the right. It does not look as good this way and Id really like Safari to segue in from the bottom - Can I force external apps to segue in from a different direction?
I'm working on a simple UI on a tvOS app and I'm facing a strange problem.
When a UISegmentedControl get focused you can move your focus around and it automatically changes the selected segment. But what I'm looking for is a way to limit the segment selection only when the user taps the segment, not when he focused it.
Any idea?
Thanks in advance.
You need to have your own internal variable for the selected segment and only change its value when the select button is pressed (which you can get using a gesture recognizer). When the segment loses focus (detectable in didUpdateFocus function) you assign the value of your internal variable to the selected index of the segment control.
You need to subclass UISegmentedControl then override didUpdateFocusInContext. In the "Custom Class" field in IB use the name of your custom class.
You can subclass UISegmentedControl and disable the behavior by defining:
#objc func _selectFocusedSegment(){
print ("select focused segment")
}
Beware that this solution is a hack. As far as I know there is no good, clean way to accomplish what you want short of steering clear of UISegmentedControl.
Also know that when a UISegmentedControl 'changes focus' between segments, it does not actually change focus. So hooking into focus updates like Nostradamus is suggesting will not work. To the focus engine UISegmentedControl behaves like a single large focusable element, not like a group of focusable segments. You can see this for yourself by debug inspecting a UIFocusUpdateContext on focusing towards or away from a UISegmentedControl.
I stumbled onto _selectFocusedSegment by defining a UISegmentedControl subclass and debug logging the various NSObject.perform methods, among others. My intent was to reverse engineer how UISegmentedControl retains a sticky last focused item, which is quite difficult to do on Apple TV. I was not able to find out exactly how UISegmentedControl manages focus, but I was able to find the answer to your question along the way.
When VoiceOver is enabled, I'd like to find out if the user is performing the left/right flick action while a UIButton is selected.
There are few methods help you with when a specific element has received or lost focus:
accessibilityElementDidLoseFocus
accessibilityElementDidBecomeFocused
But nothing within the UIAccessibilityAction to help find if the user attempted a flick left or right.
Is there a way to find out what the user is attempting to do?
No. You should not attempt to override the left and right VoiceOver swipe gestures. if you need to adjust a value with swiping, consider implementing a custom control with the trait UIAccessibilityTraitAdjustable. If you need to support direct gesture interaction, adopt UIAccessibilityTraitAllowsDirectInteraction.
Edit: To answer your question, you might be able to watch focus change, issue a screen change notification, return new children, and focus the first. Please see my comment below about why this may be undesirable.
I want to get the keyboard size without using NSNotification. When I press the plus button, it can replace the keyboard with a custom UIView like this:
Then the plus button is pressed and the view loaded:
How can I achieve this?
I already made same rookie mistake like you want to do here. The problem is you will write a lot only to realize you do not want to avoid standard flow provided you by iOS team. For example you will definitely have a bad time dealing with issue like this one (there is additional bar which is part of standard keyboard for Chinese locale):
I solved this by using other people's work from DAKeyboardControl project. You do not need to attach observer (or if you use DAKeyboardControl - block) directly to your bar with buttons, but to your controller and check what user is trying to do and animate this bar accordingly. In the sources you can see how to get keyboard's animation duration and timing function. It may sound more complicated than it indeed is, just give it a try.