How do I do something when the ios notification bar(or whatever it is called) is dropped down? I want to show my loading picture when the user checks the bar when in my app. Netflix does this (at least in my ipad) when you are in Netflix and you drop the notification bar down, the Netflix app changes so that it is the same picture as when it is loading(their logo on a red background that takes up the whole view) and when the notification bar hides, it goes right back to whatever you were looking at. I'm more familiar with android so forgive my bad ios vocab.
I don't think you can sense when the notification center is pulled down from the status bar.
However, you can simply react to the
- (void)applicationWillResignActive:(UIApplication *)application
method (doc), in your AppDelegate. This method gets called the exact same moment you start pulling down the notification center, but it also gets called in other situations (for example, every time your app moves to background, or a SMS message comes in...).
If you need to differentiate the behavior from the - say - "background" case, you should note that when pulling down the notification center the - (void)applicationDidEnterBackground:(UIApplication *)application method doesn't get called, while in the background case, it does.
Hope this can help!
Related
In my app I need to know when Notification or Control center are displayed (I'm displaying some information when app goes to background). In my AppDelegate I "listen" to events like when app goes to background, etc... I workd for all cases....except for Notification or Control center. It is very weird that AppDelegate receives "applicationDidBecomeActive" event when Notification center is displayed. Control center works like it should btw. That makes no sense to me.
Anybody have solution/info regarding this?
How can I trigger the following behavior in Swift UI Tests via XCTest:
Get the app to foreground and inactive (applicationWillResignActive) and back to "foreground and active" (applicationDidBecomeActive)
Possible gestures, while app is in foreground and active, could be:
open app switcher and go back to app
open control center and hide control center
open notification center and hide notification center
I searched for something like that following fictive(!) code XCUIDevice.shared.doublePress(XCUIDevice.Button.home) or XCUIDevice.shared.swipeDownFromOutside(); XCUIDevice.shared.swipeUpFromOutside().
Or a more better way a method call to simulate an open app switcher, control center or notification center immediately.
Or in the best way to simulate the status applicationWillResignActive, applicationDidBecomeActive immediately.
Important to understand: the event applicationDidEnterBackground must not called - the app has to stay in foreground (but inactive)!
So recently on wwdc2017 Apple released a convenient way to work with multi app. You can see the multi App portion of the video link below.
https://developer.apple.com/videos/play/wwdc2017/409/
im developing an iOS App and i would like it to behave like PayPal when the user double taps the home button.
For those who dont know the PayPal app displays a custom image when the app is displayed on the multitask switcher but it doesnt when a notification arrives or when the user pulls the notifications bar.
My issue comes when implementing this, im using the event applicationWillResignActive to display my custom image (as applicationEnteredBackground is not called for this). But this method is called on events on which i dont want the app to display the image (such as notifications, calls, pulling the top bar, etc).
Is there any way of setting this image only when the home button is double tapped?
Thank you!
From what I see, PayPal doesn't cover the viewport with a custom image immediately – when I double tap the Home button, it remains rendered normally until I do something else – but most probably on applicationDidEnterBackground:. After switching to Home screen or another application, the PayPal preview becomes covered.
On the other hand, my mobile banking application does that immediately when applicationWillResignActive: is triggered.
These are AFAIK the only two approaches you can achieve.
Long story short, I'm trying to change my iOS app's rootViewController on applicationWillEnterForeground:, like so:
- (void)applicationWillEnterForeground:(UIApplication *)application
{
MyViewController *controller = [[MyViewController alloc] init];
self.window.rootViewController = controller;
}
However, when iOS performs the "zoom in" animation that is performed when an app is moved from the background to the foreground, it still shows the previous rootViewController's view. Then, as soon as the animation is complete, the app blasts the new rootViewController's view onto the screen.
One way to solve this is to simply move that code to - (void)applicationDidEnterBackground:, but the problem with this solution is that, in my app, there is no way to tell if a new rootViewController will be assigned until - (void)applicationWillEnterForeground:(UIApplication *)application (it is based on time passed since leaving the app).
How can I force the app to redraw before iOS performs the animation taking the app from the background to the foreground?
I believe this is not possible. The screen that iOS shows of your app when it comes into the foreground is actually a screenshot the system took when the app went into the background. There is no way to manipulate or replace that image at the time the app comes back into the foreground.
This behavior is partly documented in the Moving to the Background section of the iOS Application Programming Guide:
Apps can use their applicationDidEnterBackground: method to prepare for moving to the background state. When moving to the background, all apps should do the following:
Prepare to have their picture taken. When the applicationDidEnterBackground: method returns, the system takes a picture of your app’s user interface and uses the resulting image for transition animations. If any views in your interface contain sensitive information, you should hide or modify those views before the applicationDidEnterBackground: method returns.
Apple does not explicitly document that you cannot modify or replace this screenshot at a later time but neither do they say the opposite anywhere I know of.
During an active VOIP call, my app is put into the background when an incoming cellular call is received and answered. If, while on the cellular call, I bring my app back to the foreground the app view appears but is unresponsive. The "Touch to return to call" banner appears at the top of the view in green but the app view appears as if there is a darker transparent window overlaid on top of it preventing the view from receiving input. If I put my app into the background, bring another app to the foreground and then bring my app back to the foreground everything works as expected so the problem seems to be specific to active cell calls and/or the green banner only? In Settings->Notifications->Phone I tried turning Notification Center OFF and Alert Style NONE in the hopes of removing the banner to see if the problem still exists but these settings do not effect that banner. In addtion to the App window appearing to have a transparent window overlaid on it, if I touch the window I'm able to drag the entire app window (or view) in all directions (up down side to side) and it has a bounce effect (like tableview vertical scroll) when I release it.
If I dont know the problem I cannot fix it (:
Thanks..
Are you sure there's no view being added on top your view which might be intercepting all your events? My second guess would've been that your app received a memory warning and unloaded a bunch of views. However, that's not very likely since you still see all the views.
I don't know what you really mean to "bring your app back to the foreground",but I can tell you for sure that you cannot call in the same thread the UI and the incoming call, so for situations like this when you want to render some view during a call you can try something like this:
public void InvokeGUIThread(Action action)
{
Dispatcher.Invoke(action);
}
For example if you want to set a text in a textblock do something like this:
InvokeGUIThread(() =>
{
textBlockSome.Text = e.Item.ToString();
});