I know the title sounds a bit awkward but let me explain my problem.
I have a tab bar based iPhone app which works perfectly so far. I can switch through the tabs and every tab loads a view controller.
But here is how it crashes. After I used the app and working with a bunch of other apps I switch back to my app (for example after one hour). The app shows the screen where I left it. Now when I try to change the tab, it crashes immediately.
The problem is that I can't reproduce this crash in the simulator or in the debug mode. I tried to open it, then close it, then reopen it but then everything works. Only after a certain amount of time the crash can be reproduced. But I don't have any logs.
Maybe anyone had the same the problem and knows what to do here?
Could it be related to low memory (i.e., you have a bug that only shows up during low memory)? Have you tried "Simulate Memory Warning" in the simulator?
Connect your device with system using iPhone utility and found the reason for crash. It may be memory problem only.
Related
Our company has an app which is basically an eBook reader.
We use the RMSDK to perform book downloads & read.
Now, something very strange is happening in iOS7 devices (not in the simulator):
I download a book using the fulfillment method in the RMSDK
I wait for the book to finish downloading. The book is saved in the NSCachesDirectory (for App Store guidelines reasons) - so far, everything works fine
I hit the home button, the app moves to the background
I hit the app button to bring the app back, that's when the problem happens:
The app gets completely stuck. Hitting the home button does nothing, hitting the power button shuts down the screen, but then hitting the power button again does nothing.
The device itself has effectively crashed.
After a few minutes, the Apple logo appears on the device and the device comes back to life after a reboot.
I have no idea what in my code could be causing the device to act this way. Shouldn't the iOS7 sandbox prevent me from being able to crash the whole device?
Any ideas on why this could be happening and what I can do to prevent it would be greatly appreciated.
EDIT:
I placed a breakpoint on the -(void)applicationDidBecomeAcvive: method in the AppDelegate, and it's not being called when clicking on the app icon in the last phase before the crash.
EDIT:
The RMSDK is using libcurl to download the books. Could this be a cause for this behavior?
EDIT:
The problem is happening if I click on ANY app after I click on the home button, not just on the same app. So for example, I click on the home button, then I try to open Fruit Ninja, and the device crashes.
We managed to solve this issue by disabling functions in RMSDK, which call mkfifo(). I'm not sure how much I can say here due to NDA but they're all located in one file and can be cleanly converted to no-ops with a nice preprocessor #if defined()
Its an OS level bug. iOS 7 is still unstable in areas, for example my Apps report crashes in places that are part of iOS 7 itself and couldn't be caused by my app.
I'm working on a website that's optimized for mobile devices that can also be used on a desktop. In order to test the functionality of it without setting up a server, I'm using the iPhone simulator that comes with XCode. The website's purpose is to give a manager for the business a way of approving or rejecting potential offers the marketers have in mind to give to customers when they are away from their desk. When you get to the Approve/Reject page, you can click either the Approve or Reject button. Each button, once pressed will bring up a window (not a separate page) where the manager can add comments. On the iPhone simulator, whenever the window comes up, the iPhone will not let you scroll down at all on the window as, for some reason, the scroll function still seems to be connected to the main page, not the window that just came up. The problem only occurs on the iPhone part of the simulator, but not on the iPad part. I've been beaten by this problem for several days and I can't find anything on the internet that gives suggestions. Does anybody have any idea on what I should do with the coding, or if it's just what happens when you run the server locally on the simulator? Any help will be appreciated, as I've exhausted all I can think of.
Note: I'm using Ruby-on-Rails and the window that is popping up us a Bootstrap modal
Try Modal box on iPhone no scroll
The modal becomes a static height on the screen and it should allow you to scroll all the way to the bottom of that window.
Change the height setting so that it fits.
I build my Corona app for iPhone Simulator, and it running well. But if I installed my app on my device(iPad), and i have many issues(no scrollview and tabbar working) buttons is visible only.
How to solve the problem?
Look at what happens when you run it in the iPad simulator- Do you get any errors in the console if you check it while running the app on your iPad? If so this could shed some light on the issue. One possibility is a corrupted image, or an incorrect image format.
If only the buttons are visible it sounds like you app has an error that is preventing all of the display objects from loading. (Just based on the fact you mention your buttons display but nothing else.)
My app/game has gone live in the App Store two days ago. Now I'm getting reports of a mysterious glitch that occurs when several levels have been completed (it's a puzzle game). The screen just gets black, no user interaction is possible anymore at all.
I think what happens is that my view gets deallocated, so the only thing that's left is my window, which has a black background.
At first I thought this could be due to a memory warning to which my view controller responds by releasing the view. But when I simulate memory warnings on the Simulator, everythings goes fine.
I have tested my app extensively using Instruments. It contains no memory leaks. It is using a constant ~43MB during gameplay. CPU load is low.
I'm quite clueless here. It's frustrating that I cannot reproduce the problem myself. I can't count the levels I've played myself anymore, trying to get this glitch to occur. Anyone have some suggestions?
But when I simulate memory warnings on the Simulator, everythings goes fine.
Did you try to simulate it on a real device with instruments? Did you try with older device models like 3g, 3gs?
Trying to finish up an app I've been developing and have hit an odd bug that I'm not sure if it's on my end? a bug on apple's end? or perhaps the underpinnings of multitasking showing themselves.
My current app is doing this weird thing when you press the home button to quit the app, and then immediately relaunch the app. You see the Default.png image as the app starts up, but when it goes to display the window/view it briefly shows the screen as it was just before you quit the app, then goes to black for about 2 seconds and then displays the correct screen as if you were starting up fresh. I'm see this on all devices, iPods, iPhones, and iPad.
This is not just me, however, I've been trying other apps to see if they do it, and have found that the Air Hockey ( http://itunes.apple.com/us/app/air-hockey/id286106725?mt=8 ) is an example of an app that does this same thing. My instinct is that there are many apps that do. But the bulk of apps dont seem to have this issue.
I've done everything I can do make sure all views and view controllers are properly released, but it's almost like the device is taking a while to truly shut down even though the app has visually disappeared, and if you restart the app within probably 3 seconds or less then it still has something in the window buffer, or tht the full on view controller hasn't truly been released yet.
Anybody seen something like this and been able to solve it?
I'm the dev of that Air Hockey - It looks like it's probably Flurry that's causing it. I have a version without Flurry & it doesn't do it.
I solved this problem by updating my Flurry files to the latest version. http://dev.flurry.com/iphone_uploadNewVersion.do