I'm downloading some file with FTP helper, it takes at least 1 to 1.30 minute during downloading process. Can i stop screen time out process Until my download is complete.
Because when screen time out then app goes in background process and FTP does not works in background i tried background thread process but did not work.
So please tell me to hold down screen and active screen while I'm downloading file.
may be bellow piece of code help's you, You can. To stop your app from timing out and going to sleep you can use:
[[UIApplication sharedApplication] setIdleTimerDisabled:YES];
and you can re-enable it
[[UIApplication sharedApplication] setIdleTimerDisabled:NO];
You aren't able to force your application to stay in the foreground while a file is being downloaded. Consider adjusting for error states in the case of an incomplete download, and also creating a progress indicator so users know that a download is taking place and should not close the application.
To stop your iPhone from getting locked you can use this code before you are starting the downloading process
[UIApplication sharedApplication].idleTimerDisabled = YES;
and when the download is completed
[UIApplication sharedApplication].idleTimerDisabled = NO;
Hope it helps :)
Googled lot for this answer.
I found that the screen time out process is dimming process when screen is in idle time then
counter start for screen time out and when counter reaches for specific screen time set by user to lock screen it will lock the screen.
[[UIApplication sharedApplication] setIdleTimerDisabled:YES];
here is the code that disable counter during your process while you are downloading some files then place the above code in that function.
and you can start counter with simple 'NO' . better to place 'didunload' or 'willdisapper' method.
[[UIApplication sharedApplication] setIdleTimerDisabled:NO];
Related
In my app I'm downloading lots of images on a method.
I'm using a
downloadTask = [[UIApplication sharedApplication]
beginBackgroundTaskWithExpirationHandler:^{
[[UIApplication sharedApplication] endBackgroundTask:downloadTask];
downloadTask = UIBackgroundTaskInvalid;
}];
This is working fine, if I press the home or sleep button, the images continue downloading.
I'm showing the progress in a UIProgressView inside an UIAlertView, and when the percent is 100% the alertView is dissmised and I change the viewController to other where I show the donwloaded images.
But I only want this to happen if the app is really active at the moment the download finish.
I have been looking at the app state and while it's downloading with the screen off.
[UIApplication sharedApplication].applicationState
the state is UIApplicationStateActive during all the donwload
How can I can know if the downloading is happening with the screen off or on?
EDITED AFTER ACCEPTING THE ANSWER:
I just discovered, if I tap the home button, the app enters in UIApplicationStateBackground, if I tap the wake/sleep it enters in UIApplicationStateInactive
Following the approach of the correct answer, my app contines donwloading in both cases.
The screen is off in two states (apart from when the app has not been even opened):
suspended : in this case you don't have to worry because the download won't procede until the app gets active again; It will enter this state on
background : it's in this state for a limited amount of time before going in suspend, and the screen is already off in this moment. Here you may want to check then whether to do all the things you said or not, because in this state code can be still executed. In this state the app status is UIApplicationStateBackground, so you could just perform a check like this:
You probably want to check whether the app is in background execution in order to achieve the result. Just like this:
if([[UIApplication sharedApplication] applicationState] != UIApplicationStateBackground) {
// Do stuff
}
If it's in background, so the screen is off.
UPDATE: after few test, what I figured out is that the behaviour you are expieriencing is probably due to the execution of the download on the main thread.
You should send the download on (for instance) the global queue. This way the application will enter the background state as expected:
....
[[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
[[UIApplication sharedApplication] endBackgroundTask:self.bti];
}];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self doBackgroundStuff];
});
....
This way, if the app is put on background while the download is in progress, the application state will turn into UIApplicationStateBackground, and then you can check it as I wrote initially. If you are doing UI updates during the progress remember to send them back to the main thread (because the download is now on a different one).
You can check whether your app is running in the background or not by setting a flag in the designated application delegate methodsapplicationDidEnterBackground: and applicationWillEnterForeground:. Example:
- (void)applicationDidEnterBackground:(UIApplication *)application
_applicationRunsInForeground = NO;
}
- (void)applicationWillEnterForeground:(UIApplication *)application {
_applicationRunsInForeground = YES;
}
If you don't want to have this _applicationRunsInForeground flag inside your application delegate, you could observe the delegate's NSNotifications in your viewcontroller class instead (UIApplicationWillEnterForegroundNotification and UIApplicationDidEnterBackgroundNotification).
I have some test code which i am using to keep my app to stay running in the background state, which works quite well on the iOS 5.1 simulator but is not behaving that way on the actual device.
Now i already know the requirements i have to follow,
so i have set "background modes" to voip and location.
In my delegate's applicationDidEnterBackground method i am calling the following function
which i call "doBackgroundActivity( )"
to request time for application to complete some long running task in background :
-(void) threadedMethod{
while(true){
NSLog(#"looping");
[self showLocalNotification:#"This notification will come every 2 min. if the app is running in background. Close it!"];
[NSThread sleepForTimeInterval: (5)]; // 60 sec = 1 min
}
}
-(void) doBackgroundActivity{
self->_backgroundTask = [ [UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
[[UIApplication sharedApplication] endBackgroundTask: self->_backgroundTask];
self->_backgroundTask = UIBackgroundTaskInvalid;
}
];
[self threadedMethod];
[[UIApplication sharedApplication] endBackgroundTask:self->_backgroundTask];
self->_backgroundTask = UIBackgroundTaskInvalid;
}
As you see, the doBackgroundAcitivity() just calls the threadedMethod() and all that does is run an infinite loop which sends a local notification every 5 seconds or so.
Now in the simulator when i run this, and minimize the app, i see a notification every 5 seconds or so. The application keeps on running in the background even when i run other applications i see my app sending notifications.
But this is not happening on the device. It looks like that the OS kills the app just after the first notification is send and i dont see any more subsequent notifications which i expect to see later?
Is there something else i have to do to keep the application running in background ?
If all you are looking to do is present a notification to the user while your app is closed you should use UILocalNotifications.
You can set when the notification should fire, as well as whether or not it should repeat, and the amount of time between repeats.
As a side note, i wouldn't recommend using sleep() in a loop to control when code is executed like that because it stops the thread from doing anything at all, and is bad for any other tasks that would like to use that thread. Instead you should use NSTimers, and other ways of controlling the time at which code is executed.
I am disabling setUserInteraction for a uiwebview. After 5 seconds I enable it again. Problem is that if user touches it during this period of 5s, not execute an action but after this timeout, action is executed! How to disable userInteraction completely or clear event history before setting its interaction again? thank you.
Try using
[[UIApplication sharedApplication] beginIgnoringInteractionEvents];
and
[[UIApplication sharedApplication] endIgnoringInteractionEvents];
instead.
Though this disables user interaction for whole application so it might not be the right workaround for you.
I build an app and i want to disable the auto dark screen, there is a way to cancel it?
i tried this method:
[(id)[UIApplication sharedApplication] setBacklightLevel:0.3f];
but it's not help.
You can just turn off idle timers at all in order to prevent dimming and standby of the device, by:
[[UIApplication sharedApplication] setIdleTimerDisabled:YES];
later you can/should enable it again (at the time when your app enters background):
[[UIApplication sharedApplication] setIdleTimerDisabled:NO];
So, I was looking for a way to keep the user's iPhone display on for a clock app. I found [UIApplication sharedApplication].idleTimerDisabled = YES; but that keeps the device from locking all of the time. I tried to [UIApplication sharedApplication].idleTimerDisabled = NO; when the application goes into the background, but that doesn't work. How can I safely keep the user's device from sleeping while my app is running?
Alter the idleTimerDisabled property whenever your app changes its active state - if you're going to be backgrounded, re-enable the timer, and when you regain control, disable the timer again.
Here's my solution, using XCode 6.2.
iPhone - phone goes to sleep even if idleTimerDisabled is YES
Basically, even now, in 2015, the only way to safely make sure that the device doesn't go to sleep is to repeatedly call a piece of code to keep the device awake.
-(void)callEveryTwentySeconds
{
// DON'T let the device go to sleep during our sync
[[UIApplication sharedApplication] setIdleTimerDisabled:NO];
[[UIApplication sharedApplication] setIdleTimerDisabled:YES];
}