In my app which am writing to learn swift and iOS9, I'm trying to pause my NStimer when user double click the home button and becomes at app switcher, accoridng to programming ios9 matt neuberg, when The user double-clicks the Home button, The user can now work in the app switcher interface. If your app is frontmost, your app delegate receives this message:
applicationWillResignActive:
But my timer only pauses when I tap home button once and when I tap twice and have the app switcher, I see my timer counting, any ideas?
Try to add this lines in your AppDelegate.swift:
static let kAppDidBecomeActive = "kAppDidBecomeActive"
static let kAppWillResignActive = "kAppWillResignActive"
func applicationDidBecomeActive(application: UIApplication) {
// Your application is now the active one
// Take into account that this method will be called when your application is launched and your timer may not initialized yet
NSNotificationCenter.defaultCenter().postNotificationName("kAppDidBecomeActive", object: nil)
}
func applicationWillResignActive(application: UIApplication) {
// Home button is pressed twice
NSNotificationCenter.defaultCenter().postNotificationName("kAppWillResignActive", object: nil)
}
In addition, set your view controller as the observer to those notifications:
override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(pauseGame), name: AppDelegate.kAppWillResignActive, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(resumeGame), name: AppDelegate.AppDelegate.kAppDidBecomeActive, object: nil)
}
Related
I'm working on digital banking app. I need the user to be re prompted for PIN/Password after the app enter background for more than X seconds. I look up scene delegate's functions but I have no idea how can I check how long the user has been in foreground and how to popping out the view. I use AppDelegate and SceneDelegate for lifecycle
you can do this by using local notification what you have to do is following.
easy steps for new user
manage a global object for app state // if needed
add a local notification in your main view controller
post a notification from your SceneDelegate
here is the example
add observer in your main controller which always appears when app start or launch
class MainViewController: UIViewController
{
override func viewDidLoad()
{
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(showPopup(notification:)), name:
NSNotification.Name(rawValue: "showPinCodePopup"), object: nil)
}
// remove observer
override func viewWillDisappear(_ animated: Bool)
{
NotificationCenter.default.removeObserver(self)
}
#objc func showPopup(notification: NSNotification) {
//show your popup here
}
}
call the local notification from your SceneDelegate when app becomes active or enter in Foreground.
class SceneDelegate: UIResponder, UIWindowSceneDelegate
{
var window: UIWindow?
func sceneDidBecomeActive(_ scene: UIScene) {
NotificationCenter.default.post(name: Notification.Name(rawValue:"showPinCodePopup"), object: nil, userInfo:nil)
// Called when the scene has moved from an inactive state to an active state.
// Use this method to restart any tasks that were paused (or not yet started) when the scene was inactive.
}
}
Hope this solution may helps you 😊
When I am open any website with movie inside WKWebKit and press on players this movie will be open inside some player, where I can pause, remove etc.
My question How I can detect when this iframe(window or player, I don't know how it is named) is open or closed and do something in background if window open or closed.
For clarity I am attached screenshot of simulator where this player was opened if I am press on player with movie on website.
I am solved this problem using NotificationCenter using UIWindowDidBecomeVisibleNotification & UIWindowDidBecomeHiddenNotification.
My code:
override func viewDidLoad() {
super.viewDidLoad()
// listen for videos playing in fullscreen
NotificationCenter.default.addObserver(self, selector: #selector(onDidEnterFullscreen(_:)), name: UIWindow.didBecomeVisibleNotification, object: view.window)
// listen for videos stopping to play in fullscreen
NotificationCenter.default.addObserver(self, selector: #selector(onDidLeaveFullscreen(_:)), name: UIWindow.didBecomeHiddenNotification, object: view.window)
}
#objc func onDidEnterFullscreen(_ notification: Notification) {
print("Enter Fullscreen")
}
#objc func onDidLeaveFullscreen(_ notification: Notification) {
print("Leave Fullscreen")
}
I am having a little bit of trouble. I am trying to use the notification center to alert the app that some content is done loading. After the user signs up or logs in successfully I create the view controller and then and then make it the root view controller using the blow
func finishLoggingIn() {
// print("Finish logging in from LoginController")
let homeController = HomeViewController()
self.loginButton.stopAnimation(animationStyle: .expand, completion: {
self.view.window?.rootViewController = homeController
self.view.window?.makeKeyAndVisible()
})
}
The login button just creates a loading animation on the button for UI purposes.
When I first enter the controller I add the observer for the notification.
let MainVCSetup = Notification.Name("mainVCComplete")
NotificationCenter.default.addObserver(self, selector: #selector(handleRootViewSwitch), name: MainVCSetup, object: nil)
When the content in my mainVC is done loading I post this same notification to the Notification Center like so
NotificationCenter.default.post(name: MainVCSetup, object: nil)
However this function never fires off no matter what I do
#objc func handleRootViewSwitch(){
print("Trying to handle root view switch attack")
NotificationCenter.default.removeObserver(self, name: MainVCSetup, object: nil)
}
If anyone notices where I went wrong I would greatly appreciate it.
I have a music app and I wish to determine if playback has been paused while the app was closed (due to an event like a phone call or AirPods being taken out of ear etc)
My first approach was to run a func inside of viewWillAppear that checked
if mediaPlayer.playbackState == .paused {
...
}
If it was paused I updated the play/pause button image. However, this did not work, the play/pause button would still show Play even if it was paused.
Next, I tried adding an observer to the viewDidLoad
NotificationCenter.default.addObserver(self, selector: #selector(self.wasSongInterupted(_:)), name: UIApplication.didBecomeActiveNotification, object: self.mediaPlayer)
The self.wasSongInterupted I call is
#objc func wasSongInterupted(_ notification: Notification) {
DispatchQueue.main.async {
if self.mediaPlayer.playbackState == .paused {
print("paused")
self.isPlaying = false
self.playPauseSongButton.isSelected = self.isPlaying
} else if self.mediaPlayer.playbackState == .playing {
self.isPlaying = true
self.playPauseSongButton.isSelected = self.isPlaying
}
}
}
However, I am still having the same issue.
What is the best way to determine if my music player is playing or paused when I reopen the app?
Edit 1: I Edited my code based on comments.
wasSongInterrupted was not being called, and through breakpoints and errors I discovered the code was mostly not needed. I changed my code to be
func wasSongInterrupted() {
DispatchQueue.main.async {
if self.mediaPlayer.playbackState == .interrupted {
var isPlaying: Bool { return self.mediaPlayer.playbackState == .playing }
print("Playback state is \(self.mediaPlayer.playbackState.rawValue), self.isPlaying Bool is \(self.isPlaying)")
self.playPauseSongButton.setImage(UIImage(named: "playIconLight"), for: .normal)
//self.playPauseSongButton.isSelected = self.isPlaying
}
}
}
and inside my AppDelegate's applicationDidBecomeActive I have
let mediaPlayerVC = MediaPlayerViewController()
mediaPlayerVC.wasSongInterupted()
Now the code runs, however I have an issue.
If I run the following code:
if self.mediaPlayer.playbackState == .interrupted {
print("interrupted \(self.isPlaying)")
}
and then make a call and come back to the app it will hit the breakpoint. It will print out interrupted as well as false which is the Bool value for self.isPlaying
However if I try to update the UI by
self.playPauseSongButton.isSelected = self.isPlaying
or by
self.playPauseSongButton.setImage(UIImage(named: "playIconLight.png"), for: .normal)
I get an error message Thread 1: EXC_BREAKPOINT (code=1, subcode=0x104af9258)
You trying to update you player UI from viewWillAppear. From Apple Documentation:
viewWillAppear(_:)
This method is called before the view controller's view is about to be added to a view hierarchy and before any animations are configured for showing the view.
So if your app was suspended and the becomes active again, this method won't be called, because your UIViewController is already at Navigations Stack.
If you want to catch the moment when your app becomes active from suspended state, you need to use AppDelegate. From Apple Documentation:
applicationDidBecomeActive(_:)
This method is called to let your app know that it moved from the inactive to active state. This can occur because your app was launched by the user or the system.
So you need to use this method at your AppDelegate to handle app running and update your interface.
UPDATE
You saying the inside this AppDelegate method you're doing
let mediaPlayerVC = MediaPlayerViewController()
mediaPlayerVC.wasSongInterupted()
That's wrong because you're creating a new view controller. What you need to do, is to access you existing view controller from navigation stack and update it.
One of the possible solutions is to use NotificationCenter to send a notification. You view controller should be subscribed to this event of course.
At first, you need to create a notification name
extension Notification.Name {
static let appBecameActive = Notification.Name(rawValue: "appBecameActive")
}
Then in you AppDelegate add following code to post your notifications when app becomes active
func applicationDidBecomeActive(_ application: UIApplication) {
NotificationCenter.default.post(name: .appBecameActive, object: nil)
}
And finally in your view controller add to subscribe it on notifications
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self,
selector: #selector(wakeUp),
name: .appBecameActive,
object: nil)
...
}
#objc func wakeUp() {
// Update your UI from here
}
Hope it helps you.
I'm making a framework that needs to do stuff when my apple watch is entering background and foreground.
I'm looking for an equivalent of this iOS code for the Apple watch since UIApplication is not present in UIKit anymore :
let notificationCenter = NSNotificationCenter.defaultCenter()
notificationCenter.addObserver(self, selector: "applicationDidEnterBackground", name: UIApplicationDidEnterBackgroundNotification, object: nil)
any help would be nice
As of watchOS 7 the following have been added:
WKExtension.applicationDidBecomeActiveNotification
WKExtension.applicationDidEnterBackgroundNotification
WKExtension.applicationDidFinishLaunchingNotification
WKExtension.applicationWillEnterForegroundNotification
WKExtension.applicationWillResignActiveNotification
Source: https://developer.apple.com/documentation/WatchKit/wkextension
Appears that the WatchOS equivalent of
let notificationCenter = NSNotificationCenter.defaultCenter()
notificationCenter.addObserver(self, selector: "applicationDidEnterBackground", name: UIApplicationDidEnterBackgroundNotification, object: nil)
is simply
let notificationCenter = NSNotificationCenter.defaultCenter()
notificationCenter.addObserver(self, selector: "applicationDidEnterBackground", name: "UIApplicationDidEnterBackgroundNotification", object: nil)
One just need to replace the emum by its string equivalent
Closest you get is applicationDidBecomeActive and applicationWillResignActive
class ExtensionDelegate: NSObject, WKExtensionDelegate {
func applicationDidFinishLaunching() {
// Perform any final initialization of your application.
}
func applicationDidBecomeActive() {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
func applicationWillResignActive() {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, etc.
}
}