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I've a tabbar application with three tabs. On third tab there is a navigation controller and account setup is done there. Once the account setup is complete, I pop all the controllers on that tab and change the selected tab to first. But after then when I select the tab to third, application crash with message "message sent to deallocated instance 0x15d17cc0". This issue occurs only on iOS 7 and not happening on iOS 6 or below.
Add Exception Breakpoint from Breakpoint Navigator and find what that instance is. Most probably your problem is a simple memory management problem and it will be fixed when you autorelease that instance instead of retaining at first.
Edit: Also you can look at this great answer
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I am new to Xcode. I have a series of sports apps that are designed to easily switch out the data for different teams. The data is in html. To create an app for a new team, I duplicate the parent app, rename it, and switch out the data files. The new app crashes when I press a button. I get the following response:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: ' -[NSSet setByAddingObject:]: object cannot be nil'*
When I run an Exception Breakpoint, it leads me to this line:
removable = [removable setByAddingObject:oteam];
I am confused because this line of code is not an issue in the parent app at all. The 2 apps' code looks identical, but the offspring app crashes. Any ideas?
The error message indicates that oteam is nil.
Objective-C collections
(arrays, dictionaries, sets) cannot hold nil elements, therefore
[removable setByAddingObject:oteam];
crashes if oteam == nil.
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What does this error mean and how to handle it?
I suspect it happens when I load images from a web service with WEBClass and during that time I push some VC that needs other data from the WEBClass. This class is a shared instance. Could that be a possible reason?
Open the Product menu in Xcode, select Edit scheme and then choose the Diagnostics tab. There you have Enable Zombie Objects. Once selected and run, the debugger will point you to the object that is causing a trouble.
Product > Edit Scheme > Diagnostics > Enable Zombie Objects
And try to reproduce the crash.
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I am making an app, and I have written some code to tell me whether or not it is the first time that the user is opening it. If it is the first time, I want to display a a little "tour" of the app (similar to the app "Pages by Fifty Three", where the user swipes between pages, introducing you to the app).
How do I display a similar welcome message in my app?
TO CLARIFY: I have already got the code for determining whether or not this is the first time the app is launching. I just want to know how i get the initial welcome tour pop up, just like in the app, "Paper"?
You can save a BOOL variable (isOpenedFirstTime) in user defaults in didFinishLaunchingWithOptions: method and check it every time if this variable exists and if it's there it means that the app was previously opened. If not exist show the 'tour' and save the variable so next time it will be there.
Ok, so, delete your app from the app simulator then before you run it, make some edits in the code.
So in the viewDidLoad of your first View Controller, use this
[[NSUserDefaults standardUserDefaults]setBool:#"Yes" forKey:#"isFirstTime"];
Then you use an if statement checking if [[NSUserDefaults standardUserDefaults] boolForKey:#"isFirstTime"]; == #"Yes" if so, present your controller modally.
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i was creating an app that have sliding menu. it reads data from rss using xml parsing and reads data from dashboard using JSon.
my problem is that i got EXC_BAD_ACCESS in main.m and in debug area, there is no exception log...
features are works perfectly. but suddenly app crashes with this exception.
am using Xcode 5 with arc.
is this any kind of memory issue. how can i resolve this?
i read some article related to memory management. but that are not much helpful...
pls help me....
You can try to add "Symbolic Breakpoint" and check where is the problem
This is instruction how to set breakpoint in xCode 5
Too little information to solve problems
This could be because:
The pointer used to point to memory that was ok, but its chunk was deallocated.
The pointer is corrupt.
Read this.
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I want to call a method of an application A from my another application B's code in ios and also want to pass arguments.
Is it possible with socket programming if yes than please give some idea about how to do that.
Thanks.
The only interprocess communication allowed by Apple on the AppStore is using URL handlers.
For more information, read here.
Using x-callback-url’s source apps can launch other apps passing data
and context information, and also provide parameters instructing the
target app to return data and control back to the source app after
executing an action.
Please refer this link for tutorials and sample code.