Is it possible to start screen recording (through Control Center) without user prompt?
I mean to ask user permission for the first time and after that to start and stop recording programmatically only?
I need to record screen only for specific events.
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I have implemented the Broadcast Upload Extension in my app.
My requirement is that the user must start it only within the app, but right now there is an entry in the recorder button in Control Center that lets the user also start it from there.
My question is: how can I remove that entry in Control Center so the only way to start the Upload Extension is via my container app?
Thanks in advance.
Unfortunately you can't hide recorder button from Control Center, but you can check your application state when user start recording from Control center with Broadcaster UI Extension, if you need any action before start recording you can inform user with Broadcaster UI extension.
Is it possible to somehow get a callback when the user presses on the physical power button on iOS? Just to make sure, I am not actually trying to change the behaviour of the power button, I just need to know when it was pressed.
Here is some extra info to explain why I need this callback. Our app uses a guided access mode to lock students in test and although guided access allows locking the device via the power button, that lock, unfortunately, causes our sockets to disconnect so we do not allow that. So what I need now is to detect the power button press so I can implement a fake lock in our app where I will dim the display and show a black image on top to save some battery power.
I want to develop an iOS app that can have like a panic button when the screen is locked. This button can be enable or disabled within the app, but
I want to know if it is possible to add a very accessible button you can press in case of an emergency even when the screen is locked. When the button is pressed I want to execute some code in the app.
Is there a possible way of accomplishing this in iOS?
Or is there an alternative?, The only think that I required is that the button can be pressed like in maximum three seconds even if the screen is locked and the app closed.
No that is not possible in iOS. You cannot make changes outside of your app.
One suggestion i can give you is to make a extension for today view in notification center. And you can ask the users to touch the button in notification center to invoke your functionality.
Notification center can be accessed in lock screen also.
I have an iOS app that automatically prints a receipt to a thermal receipt printer when an order comes in and works great. However, if the app is in the background, it does not print. Is it possible to allow it to print while running in the background?
There are only a few occasions you are allowed to run certain tasks in the background. See the Apple documentation: https://developer.apple.com/library/ios/documentation/iphone/conceptual/iphoneosprogrammingguide/ManagingYourApplicationsFlow/ManagingYourApplicationsFlow.html#//apple_ref/doc/uid/TP40007072-CH4-SW20
For example: playing audio, fetching the user location, sending notification or certain data from network in the background is allowed. Running your own logic during a background service is, as far as I understood, not allowed (like running it one hour after your app is gone to sleep/background mode).
The only thing that is perhaps an option, is to utilize the time your app has to finish an task after the home button is pressed. There is a timelimit however of 10 or 15 minutes.
I don't know if this is suitable for your situation?
See this stackoverflow question: iOS application executing tasks in background
And this particular piece of code to run the task in the background: https://stackoverflow.com/a/11809211/2740112
Another option is to use Guided Access, which is introduced since iOS6.
With it, you can prevent exiting the app. It's only usefull when using only the app on the device that needs to be used.
Information below from http://www.assistiveware.com/support/faq/page/136:
To turn on Guided Access, do the following:
Go to the Settings app on your device's home screen.
Tap General.
Tap Accessibility.
Under the Learning section (scroll down if necessary), tap Guided Access.
Toggle Guided Access to ON.
Tap Set Passcode and enter a four digit passcode. You will be prompted to enter it again.
(Optional) Toggle Enable Screen Sleep to ON if you want to be able to put your device to sleep with the Power button, otherwise the Power button will be disabled.
To start Guided Access for an app and prevent it from being exited, do the following:
Open the app that you want to lock in.
Quickly press your device's Home button three times to bring up the Guided Access menu.
Tap the Start button in the top right corner of the screen to activate Guided Access. A message stating "Guided Access Started" will briefly appear.
To end Guided Access for an app so it can be exited, do the following:
Quickly press your device's Home button three times to bring up the Guided Access menu.
Enter your four digit passcode when prompted.
Tap the End button in the top left corner of the screen to end Guided Access. A message stating "Guided Access Ended" will briefly appear.
Here's the knowledgebase article of Apple: http://support.apple.com/kb/ht5509
I would like to execute some code when user presses one of home, power or volume buttons(it doesn't matter, which of these).
I would like to catch events even application is minimized to background and device is sleeping.
So primary task is processing events, when device is inside user's pocket and the user presses button, but not takes out the device.
Is that possible? If it isnt't possible for power button, may be it's possible for volume or home buttons? How can I do it?
Your application cannot interact with the hardware buttons on an iOS device. Your application can receive notification that it has entered the background (which may be a side-effect of the use pressing the home button, for example) but that is about all
There is idea about volume buttons, if you create player instance you can get notifications about volume change, not sure that is still work but you can try.
see answers here: program access to iPhone volume buttons