It's hard to describe my iPhone's situation..
I launched an App and used it. for example, a Twitter app.
After that I closed it with Home Button.
Then I launched a few apps which were enough to take most memory.
And, when I launch the Twitter app again, a screenshot(snapshot), which was taken exactly when I closed the app at first, was shown about 0.5~1 sec.
I know this is a way of animation effect, but mine is somewhat wrong,
because that screenshot should be 'loading image (ex: Default.png)' if the app launched long time ago is about to start from the beginning (the 'twitter' app must be closed because of out of memory).
It makes stressful situation when I use kind of 'personal memo app'.
Before I upgrade to iOS 4.3.3, whenever I launch this app, it requires password without showing any old screenshot.
But now, everyone can see my memo because of that automatic snapshot which pops up about a second.
Help needed. Thanks!
Before your app goes into background you need to hide/remove all the views you don't want to appear when you open the app again.
You should do this in the applicationDidEnterBackground: UIApplicationDelegate method.
See the Remove sensitive information from views before moving to the background bullet point in this section of the Apple Developer Docs.
The only way I know to prevent that is to set "Application does not run in background" in your plist file.
Related
I coded my app with several ViewControllers including an initial WelcomeVC. My app works well and I have no delay when launching it. I have seen that LaunchScreen.storyboard is used for first screen when app is launched but I don't need it in my app. I want to use it and submit it this way to the App Store without LaunchScreen. Do you know if this is possible?
Nevertheless I tried to add a simple LaunchScreen but I see no utility as on my Iphone when the App starts it goes so quick that I don't see the LaunchScreen.
Can I post an app without LaunchScreen?
Can I post an app without LaunchScreen?
No. Well, you can post it, but it will be rejected.
The launch screen does more than just provide an interim screen during launch. It also acts as a signal so that the device knows your app can adapt to it. Therefore Apple now requires (or soon will require) that an app submitted to the app store have a launch screen.
I have read some bits and pieces here and there about multitasking, but I am not sure I grasp it all. Basically, I have an iPhone app that runs quite ok on the iPhone simulator (I have yet to pay the dev fee to be able to deploy to an actual iPhone).
In the simulator, I can enter and exit the app, without issue. When I open the multitasking bar (double tap on the home button), I can close the app. When I try to reopen it, I then get an error.
I wonder, is this because testing closing and opening the app from multitasking is only possible on an actual iPhone, or are the some additional events I should be listening to? I have read this: http://www.cocos2d-iphone.org/forum/topic/8767 and added some handlers, but this article feels dated, and it didn't change anything.
Any help is appreciated!
The post about SIGKILL is correct. It is normal behavior for your application. Xcode is just reporting what killed your application the last time. Simply stop the execution and run your app again, and you should be fine.
As Richard said, that is normal. If you want to test it yourself:
Run the app using Xcode.
Stop the app using Xcode. (Press the Stop button which is directly to the right of the run button.
Launch the app by clicking on it in the Simulator's home screen.
Close the app and then close it from the multitasking bar.
Launch it again.
Good luck :)
I've extensively searched the web, and everything I've found suggests that I can use 'applicationDidEnterBackground' to detect that a screenshot is about to be taken, hide the relevant controls, and then show them again in 'applicationWillEnterForeground'.
Circumvent screenshot for iOS 4
Unfortunately, I can't seem to get this message to be sent to my app when I take a screenshot on the device. I've even created a brand new template app, and tried that, and they are still not sent.
The only thing I can think of is that I'm running iOS 5.0.1 on my device, and all of the web pages I've found have referred to iOS 4.
Can anyone verify they have it working on iOS 5, and if so, what do I need to do to get it working in my app?
Please help.
The srceenshot talked about in the thread you mentioned is the one used when app is send to the background when the user presses the home button.
It is the screen that the user will see when you start the app when it is already running.
You arre talking about the screenshot when the user is pressing the home and power button are pressed at the same time.
The screenshot with this methods (home + power button) can't be detected by my knowledge.
I want to run my application without opening the slide lock of iPhone the icon of the app should be displayed on the home wallpaper or screen. by tapping on the icon the app should run its an emergency service application. So is there any service provided by apple like calling emergency numbers without opening lock.
please suggest me
thanks..
No. You have to launch all Apps through the home screen (Springboard).
There might be a way to do this when jailbreaking the device, though.
That same functionality, which you speak of, is exactly what runs on the iPhone BEFORE it is "activated". I wonder if there is a way to use this already built in app to create what you're shooting for.
The app responds to a custom URL, and correctly launches when in a suspended state. The question is, can I disable showing the Default.png when launched this way?
A use case for clarity:
app is started normally
a home button press puts app in standby
a url of the scheme the app recognizes is tapped in mobile safari
users sees Default.png before launch is complete.
As you probably know, when fast app switching activates usually the app is redisplayed with a screenshot of the last state rather than the Default.png. This is what I'd prefer happens when the URL launch takes place also.
It sounds like what is going on is that Fast App Switching is not actually working. So:
Make sure you are building the application for SDK for OS 4.0. If you don't, you app will not have fast app switching support.
See if fast app switching normally (otherwise) works with your application. I.E. when you just switch to safari, then re-launch your application, do you get the "default.png"?
Run the app under the debugger, but on your actual device. Make the problem happen, go into the Organizer, and look under device logs. This will show you if there was a low-memory issue which caused your application to be terminated, when Safari was launched, thus requiring it to be re-launched when the URL was selected.
I believe there were two mechanisms in place. In my app, I do not support "Launch with URL" - but what I do do is support the Application Delegate's call:
-(BOOL) application:(UIApplication *) application handleOpenURL:(NSURL *) url {
This may be the difference - this is the call which can be made to an application that is running to hand it a URL to process. If you are using the other technique, use this one instead. I use this, and do not see the "default.png" - i.e. do not evoke a "clean relaunch" when I get called.
Here's a possible workaround. This was causing me a headache with trying to seamlessly return from Facebook's single sign on process. I wanted the appearance of going back to my app's login area, instead of the appearance of restarting the app, even though I verified in every way possible that the app was indeed returning from fast app switching and not actually restarting.
While I couldn't find any way to force the app to display the previous state's screenshot, I did discover that the app will display Default-scheme.png (for example, Default-fb12345.png or Default-appname.png) when invoked with a url. So if your post-app switching screenshot is fairly predictable, grab a screenshot from iOS Simulator and copy it into your app. I would consider this an iOS bug. The app should always display the last screenshot when app switching, rather than Default-scheme.png simply because a url is involved.
Another possibility, which I didn't test, would be to symlink the bundle's Default-scheme.png (and Default-scheme#2x.png) to the snapshot file in the app home directory. This would be Library/Caches/Snapshots/[Bundle identifier]/UIApplicationAutomaticSnapshotDefault-Portrait#2x.jpg for most situations (unless it's landscape, or an iPad). If your app's state is unpredictable but the orientation is fixed, this could be a good option to try.
Make sure you've got the "Required Background Modes" key set in the Info.plist to the function that the app needs. If it's not listed, I just use "App Plays Audio" to keep it open.