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POiphone table view scroll aborts - unrecognized selector
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copied!<p>I know there have been a ton of questions about the same thing, but so far I haven't been able to apply any solutions to my problem. And I still haven't figured out how to use Instruments.</p> <p>I'm taking a basic tutorial for an iPhone app and just trying to tweak it slightly (I am new to Objective C). I want it to read from a plist with an array of dicts instead of an array of strings. The table initially displays the data correctly. However whenever I scroll the table up (and off the screen), I am getting Unrecognized Selector exceptions. Just populating employees with NSStrings works fine. I am lost. </p> <p>Relevant portions of the ViewController:</p> <pre><code>@interface RootViewController : UITableViewController { NSMutableArray *employees_; } @property (nonatomic, retain) NSMutableArray *employees; @end </code></pre> <p>and </p> <pre><code>@implementation RootViewController @synthesize employees=employees_; - (void)viewDidLoad { [super viewDidLoad]; NSString *path = [[NSBundle mainBundle] pathForResource:@"Employees" ofType:@"plist"]; NSMutableArray *empArray = [[NSMutableArray alloc] initWithContentsOfFile:path]; employees_ = [empArray valueForKey:@"name"]; [empArray release]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease]; } // Configure the cell. cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; cell.textLabel.text = [self.employees objectAtIndex:indexPath.row];//this is where it errors return cell; } - (void)dealloc { [employees_ release]; [super dealloc]; } @end </code></pre> <p>and plist:</p> <pre><code>array dict key name /key string Employee One /string key id /key string T1234 /string /dict dict key name /key string Employee Two /string key id /key string T5678 /string /dict /array </code></pre> <p>Error that I received:</p> <pre> 2011-10-18 20:02:44.313 MyApp[65148:bc03] -[NSCFString objectAtIndex:]: unrecognized selector sent to instance 0x689a050 2011-10-18 20:02:44.316 MyApp[65148:bc03] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString objectAtIndex:]: unrecognized selector sent to instance 0x689a050' *** Call stack at first throw: ( 0 CoreFoundation 0x00dc25a9 __exceptionPreprocess + 185 1 libobjc.A.dylib 0x00f16313 objc_exception_throw + 44 2 CoreFoundation 0x00dc40bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187 3 CoreFoundation 0x00d33966 ___forwarding___ + 966 4 CoreFoundation 0x00d33522 _CF_forwarding_prep_0 + 50 5 MyApp 0x00002a96 -[RootViewController tableView:cellForRowAtIndexPath:] + 326 6 UIKit 0x00089b98 -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:withIndexPath:] + 634 7 UIKit 0x0007f4cc -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:] + 75 8 UIKit 0x000948cc -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow:] + 1561 9 UIKit 0x0008c90c -[UITableView layoutSubviews] + 242 10 QuartzCore 0x016aca5a -[CALayer layoutSublayers] + 181 11 QuartzCore 0x016aeddc CALayerLayoutIfNeeded + 220 12 QuartzCore 0x016540b4 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 310 13 QuartzCore 0x01655294 _ZN2CA11Transaction6commitEv + 292 14 QuartzCore 0x0165546d _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 99 15 CoreFoundation 0x00da389b __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 27 16 CoreFoundation 0x00d386e7 __CFRunLoopDoObservers + 295 17 CoreFoundation 0x00d011d7 __CFRunLoopRun + 1575 18 CoreFoundation 0x00d00840 CFRunLoopRunSpecific + 208 19 CoreFoundation 0x00d00761 CFRunLoopRunInMode + 97 20 GraphicsServices 0x00ffa1c4 GSEventRunModal + 217 21 GraphicsServices 0x00ffa289 GSEventRun + 115 22 UIKit 0x00022c93 UIApplicationMain + 1160 23 MyApp 0x00002249 main + 121 24 MyApp 0x000021c5 start + 53 ) terminate called throwing an exceptionCurrent language: auto; currently objective-c (gdb) </pre>

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