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POPull to refresh crashes app
 

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  1. POPull to refresh crashes app
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    <p>I have an app, that takes events from 3 shared Google Calendars and displays it in a table view. </p> <p>I wanted to implement pull to refresh, but the app keeps crashing, if I let go from the pull, before the data is loaded. (if I hold the pull for a couple of seconds everything is fine - if I let go immediately it crashes.</p> <p>Code:</p> <pre><code>-(void)viewDidLoad { [super viewDidLoad]; UIRefreshControl *refresh = [[UIRefreshControl alloc] init]; refresh.attributedTitle = [[NSAttributedString alloc] initWithString:@"Pull to Refresh"]; [refresh addTarget:self action:@selector(getEvents) forControlEvents:UIControlEventValueChanged]; self.refreshControl = refresh; startDates = [[NSMutableArray alloc] init]; [self getEvents]; } - (void)stopRefresh { [self.refreshControl endRefreshing]; } -(void)getEvents { [startDates removeAllObjects]; startDates = [NSMutableArray array]; sectionEntries = [NSMutableArray array]; entries = [NSMutableArray array]; sortedStartDates = [[NSArray alloc]init]; _imageForCalendarType = [[NSDictionary alloc]init]; _imageForCalendarType = @{ @"The Irish House Music Calendar" : [UIImage imageNamed:@"music.png"] , @"FixedEvents-Student Night" : [UIImage imageNamed:@"student.png"] , @"FixedEvents-Ladies Night" : [UIImage imageNamed:@"cocktail.png"] , @"AppTest" : [UIImage imageNamed:@"football.png"] }; dispatch_async(kBgQueue, ^{ NSData* data = [NSData dataWithContentsOfURL:sportsCalendarURL]; [self performSelectorOnMainThread:@selector(fetchedData:) withObject:data waitUntilDone:YES]; NSData* data2 = [NSData dataWithContentsOfURL:musicCalendarURL]; [self performSelectorOnMainThread:@selector(fetchedData:) withObject:data2 waitUntilDone:YES]; NSData* data3 = [NSData dataWithContentsOfURL:fixedCalendarURL]; [self performSelectorOnMainThread:@selector(fetchedData:) withObject:data3 waitUntilDone:YES]; // Reload table view - UI operation, so must be run on main thread dispatch_async(dispatch_get_main_queue(), ^{ sortedStartDates = [startDates sortedArrayUsingSelector:@selector(compare:)]; [self.tableView reloadData]; [self performSelector:@selector(stopRefresh) withObject:nil afterDelay:2.5]; }); }); } </code></pre> <p>It gives me a SIGABRT error in this line in the cellForRowAtIndexPath method:</p> <pre><code> NSInteger index = [self getRow:sortedStartDates[indexPath.section]]; // get correct index for sectionEntries </code></pre> <p>Error: <strong>* Terminating app due to uncaught exception 'NSRangeException', reason: '*</strong> -[__NSArrayI objectAtIndex:]: index 4 beyond bounds for empty array'</p> <p>It seems like the error is because theres no data in my startDates NSMutableArray, but if i comment the line [startDates removeAllObjects] I get redundant cells.</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. UScatu
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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    2. PO
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    1. VO
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      1. POPull to refresh crashes app
      1. This table or related slice is empty.
      1. VTUpMod
    1. COWhatever the issue: redundant or extra cells, the tableview datasource is not configured correctly. Check the results of `numberOfRowsInSection` and `numberOfSectionsInTableView` methods first.
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      1. POPull to refresh crashes app
      1. USA-Live
    2. COThe problem only occurs if I let go of the "pull to refresh" before it's actually updated the data. Seems to me the app is trying to create the cells before I have any data to put in them
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      1. POPull to refresh crashes app
      1. UScatu
 

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