xcode catch exception NSRangeException

Question

I have an error with handling exceptions, and every time I open my app after the first launch, the app is terminated. My app is one where, once launched, data is inputted using a UI table view.

Is there a way to catch the error so that the app doesn't terminate? Please help.

Master View Controller:

override func viewDidLoad() {
    super.viewDidLoad()

      firstLaunchOfApp()
}


//MARK: - Check for first launch
func firstLaunchOfApp() {
    let launchedBefore = NSUserDefaults.standardUserDefaults().boolForKey("launchedBefore")
    if launchedBefore  {
        print("Not first launch.")
        let index = NSIndexPath(forRow: 0, inSection: 0)
        tableView.selectRowAtIndexPath(index, animated: false, scrollPosition: .Top)
        pushNewValuesToDetail()
    }
    else {
        print("First launch, setting NSUserDefault.")
        NSUserDefaults.standardUserDefaults().setBool(true, forKey: "launchedBefore")

        dispatch_async(dispatch_get_main_queue()) {
            self.addNewCourseWork()
        }

    }
}

XCode Message:

Not first launch. 2016-05-11 16:27:45.530 CWCoreData[96559:855380] *** Terminating app due to uncaught exception 'NSRangeException', reason: '-[UITableView _contentOffsetForScrollingToRowAtIndexPath:atScrollPosition:]: row (0) beyond bounds (0) for section (0).'

probably tableview is not loaded yet, call tableview.reloadData before that,or select in viewWillAppear — ogres, May 11 '16 at 16:03
tried placing "firstLaunchOfApp()" in ViewWillAppear - same error. How would I go about calling tableview.reloadData? — IOS Programmer, May 11 '16 at 16:08
The table.reloadData won't work as view has not loaded yet.Try the code in viewdidAppear — Ahmad Ishfaq, May 11 '16 at 16:09
view has loaded and thats why viewDidLoad is called :) even the name says it. — ogres, May 12 '16 at 08:30
Does this answer your question? [Catching NSException in Swift](https://stackoverflow.com/questions/32758811/catching-nsexception-in-swift) — Sindre Sorhus, Mar 09 '20 at 14:48

score 1 · Answer 1 · edited May 23 '17 at 12:24

1

If you want to catch the exception, Swift's do and catch statements won't help as it's an Objective-C exception.

This answer provides a good solution.

edited May 23 '17 at 12:24

Community

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answered May 11 '16 at 16:14

Eric

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score 0 · Accepted Answer · answered May 11 '16 at 16:03

0

Your app is crashing because when viewdidload fires the table is not yet populated so their is no row to select.Try doing that in viewdidAppear method.

answered May 11 '16 at 16:03

Ahmad Ishfaq

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I said viewdidAppear not ViewWillAppear :) – Ahmad Ishfaq May 11 '16 at 16:08
Don't have ViewDidAppear in my file. Do I just create it? – IOS Programmer May 11 '16 at 16:10
Yes it is a function just like viewdidload. – Ahmad Ishfaq May 11 '16 at 16:12
override func viewDidAppear(animated: Bool) { }.This is the function – Ahmad Ishfaq May 11 '16 at 16:13

xcode catch exception NSRangeException

2 Answers2