CODEWITHSUNDEEP
iphoneiosuitableview
C.Johns
C.Johns

Reputation: 10245

scrollToRowAtIndexPath checks for indexpath before my tableview is set up

I am using the scrollToRowAtIndexPath to center my tableview on the previously selected cell, however its crashing the app while testing on the phone but not on the emulator.

This is how I set it up

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    //Center previously selected cell to center of the screen
    [self.tableView reloadData];
    [self.tableView scrollToRowAtIndexPath:oldCheckedIndexPath atScrollPosition:UITableViewScrollPositionMiddle animated:NO];
}

And this is the error its giving

 *** Terminating app due to uncaught exception 'NSRangeException', reason: '-[UITableView scrollToRowAtIndexPath:atScrollPosition:animated:]: section (0) beyond bounds (0).'
*** First throw call stack:
(0x31fe88bf 0x31d581e5 0x31fe87b9 0x31fe87db 0x32b6df1f 0x29bef 0x32ae26b5 0x32b3daf1 0x32afed21 0x32afea71 0x32afe78b 0x32afe4ff 0x32ab581b 0x32abafb9 0x3193aba7 0x3273be8d 0x31fbb2dd 0x31f3e4dd 0x31f3e3a5 0x3204afed 0x32ace743 0x34f5 0x2f70)
terminate called throwing an exception(gdb)

The thing being is I set 

[self.tableView reloadData];
        [self.tableView scrollToRowAtIndexPath:oldCheckedIndexPath atScrollPosition:UITableViewScrollPositionMiddle animated:NO];

in a different method the application works fine but dose not scroll to the index position.. I dont know how to fix it.

UPdate New error when trying to delay scrollToRowAtIndexPath

2011-11-02 16:00:58.180 code[2303:707] -[VehicleResultViewController methodThatCallsScrollToRow]: unrecognized selector sent to instance 0x1f3410
2011-11-02 16:00:58.184 code[2303:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[VehicleResultViewController methodThatCallsScrollToRow]: unrecognized selector sent to instance 0x1f3410'
*** First throw call stack:
(0x31fe88bf 0x31d581e5 0x31febacb 0x31fea945 0x31f45680 0x35bef943 0x31fbca63 0x31fbc6c9 0x31fbb29f 0x31f3e4dd 0x31f3e3a5 0x3204afed 0x32ace743 0x34a9 0x2f24)
terminate called throwing an exception(gdb)

Upvotes: 0

Views: 3354

Answers (1)

Owen Hartnett
Owen Hartnett

Reputation: 5935

You probably don't need to reload data - just run your scrollToRowAtIndexPath after a delay:

[self performSelector:@selector(methodThatCallsScrollToRow) withObject:nil afterDelay:2.5];

Give the table a chance to load.

Upvotes: 4

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