Question

Hi i made an application which has tableview, it works fine but now it starts falling when i scroll it.It always scroll nearly 5-10 percent of content, so if i use it on table whit 200 data it scroll 10-20 but whit larger data it shows larger data but then it falls.Can U help me why?or where i have to find the problem?
thanks

the error message:

2011-02-09 13:23:13.631 NavTest[2277:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFString appendString:]: nil argument'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x00fa0be9 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x010f55c2 objc_exception_throw + 47
    2   CoreFoundation                      0x00f59628 +[NSException raise:format:arguments:] + 136
    3   CoreFoundation                      0x00f5959a +[NSException raise:format:] + 58
    4   Foundation                          0x000bf406 mutateError + 156
    5   NavTest                             0x0000c13a -[TretiViewController configureCell:atIndexPath:] + 487
    6   NavTest                             0x0000cb22 -[TretiViewController tableView:cellForRowAtIndexPath:] + 191
    7   UIKit                               0x003467fa -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:withIndexPath:] + 634
    8   UIKit                               0x0033c77f -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:] + 75
    9   UIKit                               0x00351450 -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow:] + 1561
    10  UIKit                               0x00349538 -[UITableView layoutSubviews] + 242
    11  QuartzCore                          0x01e5e451 -[CALayer layoutSublayers] + 181
    12  QuartzCore                          0x01e5e17c CALayerLayoutIfNeeded + 220
    13  QuartzCore                          0x01e5737c _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 310
    14  QuartzCore                          0x01e570d0 _ZN2CA11Transaction6commitEv + 292
    15  QuartzCore                          0x01e877d5 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 99
    16  CoreFoundation                      0x00f81fbb __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 27
    17  CoreFoundation                      0x00f170e7 __CFRunLoopDoObservers + 295
    18  CoreFoundation                      0x00edfbd7 __CFRunLoopRun + 1575
    19  CoreFoundation                      0x00edf240 CFRunLoopRunSpecific + 208
    20  CoreFoundation                      0x00edf161 CFRunLoopRunInMode + 97
    21  GraphicsServices                    0x018d5268 GSEventRunModal + 217
    22  GraphicsServices                    0x018d532d GSEventRun + 115
    23  UIKit                               0x002e142e UIApplicationMain + 1160
    24  NavTest                             0x0000257c main + 102
    25  NavTest                             0x0000250d start + 53
)
terminate called after throwing an instance of 'NSException'

Answer 1

The application crashes at [NSCFString appendString:]: nil.Just go through your code,where you are using appendstring function.In that point,you are getting nil,hence the application is crashing.You can also debug your code,i hope you will get solution.