See update below.
I'm writing a tweak and am using AppList. I am hooking into spotlight and creating a table off all installed applications. I am trying to use the dataSource to get the information (display identifier etc). The problem is if dataSource is defined... I get the following error:
SpringBoard[1622] <Warning>: *** Assertion failure in -[NSIndexPath row], /SourceCache/UIKit/UIKit-2380.17/UITableViewSupport.m:2680
SpringBoard[1622] <Warning>: ***** AltKeyboard Uncaught Exception: Invalid index path for use with UITableView. Index paths passed to table view must contain exactly two indices specifying the section and row. Please use the category on NSIndexPath in UITableView.h if possible. *****
or
SpringBoard[1890] <Warning>: ***** AltKeyboard Uncaught Exception: *** -[__NSArrayM objectAtIndex:]: index 2 beyond bounds [0 .. 1] *****
SpringBoard[1890] <Error>: *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 2 beyond bounds [0 .. 1]'
*** First throw call stack:
If dataSource is not defined and I use fake data (test name), the table is generated fine. When I print the dataSource there are only two items in it.
Ryan Petrich, on IRC, seemed to suggest that I was doing everything completely wrong but wasn't much help after that. Perhaps I am going about solving this problem incorrectly?
Code: http://pastebin.ca/2457626
Repository: https://github.com/twodayslate/ListLauncher
edit/update!
dataSource is giving me problems. It isn't fetching the same number of apps and thus I am getting index errors and the like. I have over 200 apps but dataSource is only fetching 2.
The following code gives no errors but only displays 2 items: http://pastebin.ca/2458961
edit!
I changed it so I just use ALApplicationList. I am able to get all the applications listed. However, when I attempt to scroll through the table, it crashes. Sorting and creating the list is really slow so I believe that might be causing the problem. I'm no pro at obj-c so I'm sure there is a better way than what I am doing. http://pastebin.ca/2459318
Your problem is twofold. First, UITableView expects to be handed index paths containing both a row and a section, where you've provided it with only a row. Second, you cannot expect unchecked array access to succeed 100% of the time, so bounds check whatever access calls you might be using. It also wouldn't hurt to use some retains in the iVar assignments you've got in your code unless you don't need to hold a reference to it (but it looks like you do).
I figured out an alternative solution to ALDataSource. I sorted ALApplicationList.applications. The problem was that the instance of the sorted NSArray would keep disappearing. So I did [values retain] and everything worked! Reinitializing the sorted values was too slow and would crash the device.
Here is the working code that successfully lists all the apps: http://pastebin.ca/2459778
Related
I have a program that grabs data from Instagram, puts it into dictionary and then I parse it.
Problems begin when I try to use that data, magically item number 0 crashes my program.
Also, after certain number next item also crashes the program.
Here is the code for UITableViewCell, that grabs text from the array/dictionaries and puts it into cell. As it looks, it crashes, if I add another check to start with number 1, it works, but crashes later when it reaches some count.
I don't understand why this happens, since I have the method that tells the TableView how many rows are in table, and it returns [self.loader.dataArray count], so it can't possibly try to load the thing that is out of bounds.
if (self.loader.dataArray[indexPath.row] != nil )
{
cell.textLabel.text = [[[self.loader.dataArray[indexPath.row] objectForKey:#"caption"] objectForKey:#"from"] objectForKey:#"full_name"];
}
Here is the error I am getting:
instagramClient[8254:907] * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSNull objectForKey:]: unrecognized selector sent to instance 0x3bb8f090'
The exception that you're getting does not indicate an out of bounds issue, it indicates that you have got an NSNull in your dataArray (or possibly in the "caption" object of one of the dictionaries in your dataArray or in the "from" object of one of those dictionaries, and so on). Try logging all of self.loader.dataArray when you get updates to that array and see if it contains any NSNull objects.
I'm trying to get better at using Xcode. I have the AllExceptions break point turned on. When my app crashes, I see this:
*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 1 beyond bounds [0 .. 0]'
*** First throw call stack:
(0xbb8052 0x209cd0a 0xba4db8 0x2255f2 0xc2439 0x12a5e0f 0x12a6589 0x146bfb1 0x147617c 0x12938e1 0x1290602 0x129b211 0x129b23f 0xc16a6 0x138a4c 0x138852 0x14d0e39 0x14d0143 0x14d13cf 0x14d3a31 0x14d398c 0x14cc3e7 0x1234812 0x1234ba2 0x121b384 0x120eaa9 0x28d3fa9 0xb8c1c5 0xaf1022 0xaef90a 0xaeedb4 0xaeeccb 0x28d2879 0x28d293e 0x120ca9b 0x265c 0x25c5)
terminate called throwing an exception(lldb)
On the LHS, when I look at the different threads, I don't see anything that really makes sense. I see some CFRunLoop stuff, but I don't see any "normal" method names like UITableView delegate/datasource methods or my own methods. I was wondering if there was a more informative stack trace available instead of the hex stuff when my app crashes. I know I can set breakpoints at each place I'm accessing the array I think I have a problem with since I'm basically just trying to have an accordion-like tableview with our specific datasource, but I was wondering if there was a faster way by looking at something useful in Xcode. Thanks!
In Xcode,
go to Breakpoint navigator on the left pane.
Click '+' at the bottom.
Choose 'Add exception Breakpoint...'
Let the default selections there and click 'Done'.
Rerun the app and see if execution stops at the line which causing this exception.
The easiest way to handle the exceptions in XCode during development is to add the exception break points.
You can do that as following.
From left menu select Exceptions navigator
Add the exception break point from bottom left button.
Add break point for all the exceptions
Run the app.
In most of the cases XCode will stop the execution on exception and point at the line that caused the exception.
I got this error after a crash:
malloc: *** error for object 0x75617b4: incorrect checksum for freed object - object was probably modified after being freed.
*** set a breakpoint in malloc_error_break to debug
2013-02-05 19:15:44.950 BusinessIdea[3171:15e03] *** Terminating app due to uncaught exception 'NSGenericException', reason: '*** Collection <__NSSetM: 0x72dc5c0> was mutated while being enumerated.'
I am not familiar with this error. Any idea what it could be?
The whole 'modified while being enumerated' error means you are probably trying to delete something from a set while iterating over it. For example
for(NSString *str in array){
if([str isequalToString:#"delete me"]){
[array removeObject:str]; //this will cause a problem,
}
}
If you want to use the fast enumeration loop, you need to build a list of items you want to remove, and then delete them after the iteration step. Alternatives are to use a traditional indexed for loop if you want to remove items in the loop body.
I know there is a lot of resources about that here but yet, I can't find what's going wrong with my code:
I have a class Level and two subclasses of Level: GameLevel and TransitionLevel. Each of this class implements the NSCoding protocol.
Then, I've got an array of Level (so it contains both classes of GameLevel and TransitionLevel). Saving the archive seems to work fine :
NSString *archivePath = [DOCUMENT_DIRECTORY stringByAppendingPathComponent:#"levels.archive"];
[NSKeyedArchiver archiveRootObject:levels toFile:archivePath];
Note that levels is the array I want to save. I can see the file, it's created and seems to contains what it's supposed to contain.
But when I want to retrieve this array :
NSString *archivePath = [DOCUMENT_DIRECTORY stringByAppendingPathComponent:#"levels.archive"];
levels = [NSKeyedUnarchiver unarchiveObjectWithFile:archivePath];
I've got this exception:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
I'm not sure what I'm missing here.
Either your implementation of initWithCoder: returns nil, either some part of your code tries to insert a nil value into an array.
You may go in the Breakpoint Navigator (⌘6) and add an Exception Breakpoint. Then, when the application raises an exception, the Debug Navigator will display the stack of the functions and methods currently executed. This would allow you to know precisely which method is trying to insert nil into an array.
After upgrading to XCode4 (v. 4.2, 4D199) it seems every time my apps crash while debugging, the debugging points to main(), and the stack is unsymbolicated and useless.
This has been working fine for years, I have no idea what has gone wrong.
I'm using GDB. I also tried the LLDB as per this advice, and it didn't work either (similar, useless stack).
My breakpoints work, I get the full stack, and can inspect variables when my code hits those.
Steps to reproduce:
NB. this happens with my own project, but I'll use Apple's code here to remove that variable from the equation
Download the following sample from Apple: https://developer.apple.com/library/ios/#samplecode/UICatalog/Introduction/Intro.html#//apple_ref/doc/uid/DTS40007710
In the ImagesViewController class, add the following code to the viewDidLoad method (so it will crash – we want it to crash for this test):
// please note: this code is designed to crash! I want it to crash, to highlight my issue with XCode.
NSMutableArray* test = [NSMutableArray new];
[test insertObject:NULL atIndex:0];
Then run the app & hit the 'Images' row.
It crashes with a message like:
2011-12-23 14:07:02.788 UICatalog[13394:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
*** First throw call stack:
(0x37bbb8bf 0x316a11e5 0x37b1020f 0x699f 0x34fac7ff 0x34fb8c39 0x34fb8aa9 0x34fb898f 0x34fb815b 0x34fb7f53 0x34fac673 0x34fac349 0x66c1 0x35026565 0x3509ece7 0x31aec943 0x37b8fa63 0x37b8f6c9 0x37b8e29f 0x37b114dd 0x37b113a5 0x3768ffcd 0x34fa1743 0x2459 0x2418)
terminate called throwing an exception(gdb)
View in xcode:
Thanks to brigadir for pointing me to the solution!
It works well. Here's some screenshots for how to solve this for anyone finding my question:
Tap the plus button of the breakpoints tab
Then click Done