Today Extension background update - objective-c

Can I update data in Today Extension, while it's in background? In a sense not visibile on screen. Or Only it's showing on the screen in method widgetPerformUpdateWithCompletionHandler??? thx for answers!

Today extension is automatically updated in the background. The NCWidgetProviding protocol method widgetPerformUpdate handles this.
func widgetPerformUpdate(completionHandler: #escaping (NCUpdateResult) -> Swift.Void)
{
completionHandler(NCUpdateResult.newData)
}
This method is called:
When widget is updated in background.
Before widget snapshot is taken.
For more you can refer to: https://github.com/pgpt10/Today-Widget

Related

NavigationLink button focusable override issue

I face an issue which stucks for days. I am createing a tvos application which reqiures a custome navigationlink(button), when I move the focus to the navigation item, it should scale a little bit, and also I need to change the parent's view backgound. It is pretty simple, but it seems that the focusabe override the my custome button Style. The test shows that the background image was changed but without any scale effect when the navigationbutton get focused. Any suggestion?
NavigationLink(destination: Text("myview"))
{Text("Test")
}
.buttonStyle(myButtonStyle())
.Focusable(true){(focus) in
//the code to change the background image
//myButtonStyle definition
struct MyButtonStyle: ButtonStyle {
func makeBody(configuration: Configuration) -> some View {
return AppButton(configuration: configuration)
}
}
struct AppButton: View {
#Environment(\.isFocused) var focused: Bool
let configuration: ButtonStyle.Configuration
var body: some View {
configuration.label
.scaleEffect(focused ? 1.1 : 1.0)
.focusable(true)
}
}
The line to change the background image is always called when the item get focused as my expected, but the scale effect is gone. If I remove the following line of codes, the scale effect is back:
// .Focusable(true){(focus) in
//the code to change the background image
// }
It looks like that this line of code override my custome style of navigation button, any ideas? Appreciate any help!
Ah, finally I found the tricky, though there is very little document about this. When Focusable was introduced, it should not be in your code to change focus engine, which will cause the navigationlink tap message uncaptured, then your navigationlink for another view will not work.
Use .onChange() function to deal with any focus change event, not use Focusable.

Can I preload the web content for Safari View Controller?

I can create Safari View Controller without problem:
let svc = SFSafariViewController(URL: NSURL(string: remote_url)!, entersReaderIfAvailable: true)
self.presentViewController(svc, animated: true, completion: nil)
Is there any way I can preload the URL before I present the view controller to the user?
For example, I can preload the URL (web content) in the background first, and after the user clicks on something, I can show the Safari View Controller with the content right away. The user will feel the page loading is faster or instant.
P.S. Workarounds/hacks are also acceptable. For example, using cache or starting the view controller in background, etc.
EDIT: please consider SFSafariViewController only.
Here is a solution.
Obviously, if you click on the button right away you'll see the loading.
But basically, I load the Browser and put the view behind another one and I put a button in this other view.
When you press the button, the browser is bring to the front, already loaded.
The only problem here is that I'm not using any transition but that's one solution at least.
import UIKit
import SafariServices
class ViewController: UIViewController {
var svc = SFSafariViewController(URL: NSURL(string: "https://microsoft.com/")!, entersReaderIfAvailable: true)
var safariView:UIView?
let containerView = UIView()
let btn = UIButton()
override func viewDidLoad() {
super.viewDidLoad()
//let tmpView = svc.view
addChildViewController(svc)
svc.didMoveToParentViewController(self)
svc.view.frame = view.frame
containerView.frame = view.frame
containerView.backgroundColor = UIColor.redColor()
safariView = svc.view
view.addSubview(safariView!)
view.addSubview(containerView)
btn.setTitle("Webizer", forState: UIControlState.Normal)
btn.titleLabel!.textColor = UIColor.blackColor()
btn.addTarget(self, action: "buttonTouched:", forControlEvents: .TouchUpInside)
btn.frame = CGRectMake(20, 50, 100, 100)
containerView.addSubview(btn)
view.sendSubviewToBack(safariView!)
// 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 buttonTouched(sender: AnyObject) {
view.bringSubviewToFront(safariView!)
//self.presentViewController(svc, animated: true, completion: nil)
}
}
Sadly this behaviour is not supported with the current implementation of SFSafariViewController. I would encourage filing a radar with Apple to add support for this behaviour but like others have suggested your best bet is to use WKWebView and start loading before its added to the hierarchy.
I came across a lovely radar from Twitter that actually mentions exactly what you're asking for. I think you might find the following requests useful:
High Priority:
- Ability to warm the SFSafariViewController before actually presenting it with a URL, URL request, HTML data or file on disk
- Currently, are investing heavily into warming the shared URL cache for high priority Tweets so that if the user hits that Tweet we
will open UIWebView (sadly not WKWebView) with that pre-cached web
page. If we could just warm an SFSafariViewController with the
desired link, this would eliminate an enormous amount of effort on our
end.
You can see in their implementation they simply cache responses using UIWebView since WKWebView seems to obfuscate the caching semantics a bit. The only risk is that UIWebView is a likely candidate for deprecation as you see in their docs "In apps that run in iOS 8 and later, use the WKWebView class instead of using UIWebView."
So unfortunately it seems that their are many hoops you need to jump through to get this all going so your best bet for now is to just pester Apple and dupe Twitters radar.
You could try using a http cache, but I don't think it would work as the Safari View Controller is working as a separate process (probably the same as Safari), so that's why it e.g. circumvents ATS.
The only way I can think of this working is to somehow force the user's Safari to load it? openURL: or adding to Reading List maybe? This doesn't sound like a viable solution.
You can always experiment with custom presentation of the view controller, attach it the view hierarchy, trigger appearance events, but set its frame to CGRectMake(0,0,1,1) or attach it somewhere off-screen, then wait a while and represent it with a correct frame.
you can download the web page using the following code . and represent it with the help of svc
let data:NSData?
do {
let weatherData = try NSData(contentsOfURL: NSURL(string: remote_url)!, options: NSDataReadingOptions())
data = weatherData
print(weatherData)
} catch {
print(error)
}
and load it when you needed in the svc
While it's technically possible to use the solution above to achieve what you're asking, this may not pass App Store review. Per the SFSafariViewController docs:
In accordance with App Store Review Guidelines, this view controller must be used to visibly present information to users; the controller may not be hidden or obscured by other views or layers. Additionally, an app may not use SFSafariViewController to track users without their knowledge and consent.

tvOS: Focus first button as preferred focus view when buttons are in horizontal order

I have been trying to focus the first button but focus engine takes the third button right below the tab bar as the first item to be focussed. I tried with preferred focus view but found that when i place the buttons in vertical order then preferred takes the preferred view to be focussed but when i placed all the buttons in horizontal plane it always takes the third button.The other approach i can think of if Focus Guide but i wonder how that will work in this scenario?
override weak var preferredFocusedView: UIView? {
get {
return thrirdButton
}
}
It happens because focus engine takes the nearest possible focus element as 1st element as you can see from the picture attached.I have attached the context screenshot for the view controller. Any help or clue to solve this will be appreciated.
Solution :
We need to add focus guide just above button 3 and redirect it to button one when the focus guide is focussed.
private var focusGuide = UIFocusGuide()
self.view.addLayoutGuide(focusGuide)
self.focusGuide.bottomAnchor.constraintEqualToAnchor(self.button3.topAnchor).active = true
self.focusGuide.leftAnchor.constraintEqualToAnchor(self.button3.leftAnchor).active = true
// Width and height
self.focusGuide.widthAnchor.constraintEqualToAnchor(self.button3.widthAnchor).active = true
self.focusGuide.heightAnchor.constraintEqualToAnchor(self.button3.heightAnchor).active = true
focusGuide.centerXAnchor.constraintEqualToAnchor(self.button3.centerXAnchor).active = true
override func didUpdateFocusInContext(context: UIFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
self.focusGuide.preferredFocusedView = button1
}
Try adding a UIFocusGuide just above the button rows. In that case, before reaching the button, it will hit your focus guide in which you can redirect the preferredFocusedView to that particular button. The code to redirect is to be done by overriding didUpdateFocusInContext method.
Assuming you have setup the focus guide in viewDidload, the following is a sample,
override func didUpdateFocusInContext(context: UIFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
super.didUpdateFocusInContext(context, withAnimationCoordinator: coordinator)
self.focusGuide.preferredFocusedView = self.mypreferredbutton
}
TO initialise a focus guide ( Do the addition of guide to view in viewDidLoad)
var focusGuide = UIFocusGuide()
self.view.addLayoutGuide(self.sidefocusGuide)
self.focusGuide.leftAnchor.constraintEqualToAnchor(self.placerLabel.leftAnchor).active = true
self.focusGuide.rightAnchor.constraintEqualToAnchor(self.placerLabel.rightAnchor).active = true
self.focusGuide.topAnchor.constraintEqualToAnchor(self.audioTable.topAnchor).active = true
I too faced a similar issue but somehow able to do it through this. The preferredFocusedView approach will also work, but you have to do lot of circus by updating some reference variable and then calling setneedsfocusupdate for that view. Try the focus guide way. Hope it helps.
EDITED:
I have added code how to setup the guide. In this case I have put the guide on the right side of my view. So, whenever your focus hits the guide, it redirects to the preferredfocusguide view that you want the focus to go to in the didUpdateFocusInContext. "There is only one view in focus at anytime.", remember thes ? So, the moment it hits the guide, the overriden method gets hit which in turn moves your focus to the guide's preferred view. For examples, you can refer to Apple's UIKitCatlog app for tvOS and here is one link explaining the same.
The best way to give the initial focus to your preferred view is by using preferredFocusEnivronments.
override var preferredFocusEnvironments: [UIFocusEnvironment] {
return [firstButton]
}
preferredFocusEnvironments will be called before didUpdateFocus, that way you can inform the system, where you want the focus to be redirected.

Receive "Siri remote" event in background on tvOS

I have made a radio player for tvOS and I wan't the audio stream to keep playing while in background. All this works nicely and was pretty easy.
However I would like to stop the stream/audio if "play/pause" button is pressed while in background. But I can't figure out how to do this.
I only want it to stop, not pause. This is how Apple Radio works.
I'm handling all my input with Press events and Actions, setup from the interface builder.
What I've found so far is how it works on iOS, and I've been suggested to use, but remoteControlReceivedWithEvent is never called (not even in foreground).
Any help on this is highly appreciated, especially if you've had the luck with implementing it yourself ;)
UIApplication.sharedApplication().beginReceivingRemoteControlEvents()
override func remoteControlReceivedWithEvent(event: UIEvent?) {}
thisI was able to get working using MediaPlayer's MPRemoteCommandCenter
func setupRemoteCommandCenter() {
let remoteCommandCenter = MPRemoteCommandCenter.sharedCommandCenter()
let pauseCommand = remoteCommandCenter.pauseCommand
pauseCommand.enabled = true
pauseCommand.addTarget(self, action: "pauseEvent")
}
func pauseEvent() {
pause()
}

How can I get a specific button running on tvOS (AppleTV) to take focus? (Objective C)

The project have some views with different buttons. When I hide a view and show the other view, I can't get the focus on my button.
I think is related to setNeedsFocusUpdate. I have read the Apple doc. There is not any example.
Does anyone know how to do it and put an example (Objective C)?
You need to override preferredFocusedView, and when you are hiding one view and showing there call this method setNeedsFocusUpdate, your preferredFocusedView implementation should be something like this
- (UIView *)preferredFocusedView
{
// Add your logic here, it could be more complicated then what is below
if (view1.hidden)
{
return _button;
}
else
{
return _button2
}
}
And if you want to make custom view get focus, override canBecomeFocused method and return true
Edit
You can use add a breakpoint and execute this command po [buttonYouWantToFocus _whyIsThisViewNotFocusable] it will tell you why its not focusable.
If you are adding a sub view programmatically, maybe this is what you want:
- (UIView *)preferredFocusedView {
return [view1 preferredFocusedView];
}
I realize your question is specific to Objective-C but here is a way to solve for this in Swift. You need to override the preferredFocusedView property.
override var preferredFocusedView: UIView? {
guard primaryView.hidden == false else {
return secondaryView
}
return primaryView
}
Then just call setNeedsFocusUpdate() whenever an event happens that causes your views to be hidden. Hope this helps...
Another option (if you don't want to use preferredFocusedView) is, instead of setting your view to be hidden, simply remove it from it's superview, like so:
myView.removeFromSuperview()
This automatically takes the focus away from the button that is removed and gives it to another one that is still on screen.