Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM itemName]: unrecognized selector sent to instance
This is my code for loading data from sqlite file
- (void) loadInitialData{
// Form the query.
NSString *query = @"select * from tasklist";
// Get the results.
if (self.toDoItems != nil) {
self.toDoItems = nil;
}
NSArray *dbResultArray = [[NSArray alloc] initWithArray:[self.dbManager loadDataFromDB:query]];
//Logging for debug purpose
NSLog(@"Result set starts");
for(NSArray *subArray in dbResultArray) {
NSLog(@"Data in array: %@",subArray);
}
NSLog(@"Result set ends");
self.toDoItems = [[NSMutableArray alloc]initWithArray:dbResultArray];
// Reload the table view.
//[self.tblPeople reloadData];
[self.tableView reloadData];
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.dbManager = [[DBManager alloc] initWithDatabaseFilename:@"todotaskdb.sql"];
self.toDoItems = [[NSMutableArray alloc] init];
[self loadInitialData];
}
And I am getting this error using NSLog
2014-11-25 18:24:13.862 ToDoList[3213:60b] Result set ends
2014-11-25 18:24:13.865 ToDoList[3213:60b] -[__NSArrayM itemName]: unrecognized selector sent to instance 0x8c996f0
2014-11-25 18:24:13.900 ToDoList[3213:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSArrayM itemName]: unrecognized selector sent to instance 0x8c996f0'
*** First throw call stack:
(
0 CoreFoundation 0x018dc1e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x0165b8e5 objc_exception_throw + 44
2 CoreFoundation 0x01979243 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
3 CoreFoundation 0x018cc50b ___forwarding___ + 1019
4 CoreFoundation 0x018cc0ee _CF_forwarding_prep_0 + 14
5 ToDoList 0x00004882 -[XYZToDoListTableViewController tableView:cellForRowAtIndexPath:] + 306
6 UIKit 0x0041411f -[UITableView _createPreparedCellForGlobalRow:withIndexPath:] + 412
7 UIKit 0x004141f3 -[UITableView _createPreparedCellForGlobalRow:] + 69
8 UIKit 0x003f5ece -[UITableView _updateVisibleCellsNow:] + 2428
9 UIKit 0x0040a6a5 -[UITableView layoutSubviews] + 213
10 UIKit 0x0038a964 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 355
11 libobjc.A.dylib 0x0166d82b -[NSObject performSelector:withObject:] + 70
12 QuartzCore 0x03d4745a -[CALayer layoutSublayers] + 148
13 QuartzCore 0x03d3b244 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
14 QuartzCore 0x03d473a5 -[CALayer layoutIfNeeded] + 160
15 UIKit 0x0044cae3 -[UIViewController window:setupWithInterfaceOrientation:] + 304
16 UIKit 0x00362aa7 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:isRotating:] + 5212
17 UIKit 0x00361646 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:] + 82
18 UIKit 0x00361518 -[UIWindow _setRotatableViewOrientation:updateStatusBar:duration:force:] + 117
19 UIKit 0x003615a0 -[UIWindow _setRotatableViewOrientation:duration:force:] + 67
20 UIKit 0x0036063a __57-[UIWindow _updateToInterfaceOrientation:duration:force:]_block_invoke + 120
21 UIKit 0x0036059c -[UIWindow _updateToInterfaceOrientation:duration:force:] + 400
22 UIKit 0x003612f3 -[UIWindow setAutorotates:forceUpdateInterfaceOrientation:] + 870
23 UIKit 0x003648e6 -[UIWindow setDelegate:] + 449
24 UIKit 0x0043eb77 -[UIViewController _tryBecomeRootViewControllerInWindow:] + 180
25 UIKit 0x0035a474 -[UIWindow addRootViewControllerViewIfPossible] + 591
26 UIKit 0x0035a5ef -[UIWindow _setHidden:forced:] + 312
27 UIKit 0x0035a86b -[UIWindow _orderFrontWithoutMakingKey] + 49
28 UIKit 0x003653c8 -[UIWindow makeKeyAndVisible] + 65
29 UIKit 0x00315bc0 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 2097
30 UIKit 0x0031a667 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 824
31 UIKit 0x0032ef92 -[UIApplication handleEvent:withNewEvent:] + 3517
32 UIKit 0x0032f555 -[UIApplication sendEvent:] + 85
33 UIKit 0x0031c250 _UIApplicationHandleEvent + 683
34 GraphicsServices 0x038d1f02 _PurpleEventCallback + 776
35 GraphicsServices 0x038d1a0d PurpleEventCallback + 46
36 CoreFoundation 0x01857ca5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
37 CoreFoundation 0x018579db __CFRunLoopDoSource1 + 523
38 CoreFoundation 0x0188268c __CFRunLoopRun + 2156
39 CoreFoundation 0x018819d3 CFRunLoopRunSpecific + 467
40 CoreFoundation 0x018817eb CFRunLoopRunInMode + 123
41 UIKit 0x00319d9c -[UIApplication _run] + 840
42 UIKit 0x0031bf9b UIApplicationMain + 1225
43 ToDoList 0x00004e0d main + 141
44 libdyld.dylib 0x01e25701 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
Ironically, if put below line at the end of viewDidLoad method, then it works.
self.dbManager = [[DBManager alloc] initWithDatabaseFilename:@"todotaskdb.sql"];
Can anyone please tell me what is it that I am doing wrong?
Answer
Your toDoItems contains Arrays which contains your items! You're may be getting arrays of the single rows in your database, so you would have to fill them into single toDoItems objects first.
Maybe you could use a factory-like pattern with a method like popToDoItemFromRow:(NSArray *)row which returns your toDoItem for this row.
Then fill an new array in your for (NSArray *subArray in dbResultArray) for these single rows. This new array should you use in you cellForRow...
may be like..
- (void) loadInitialData{
// Form the query.
NSString *query = @"select * from tasklist";
// Get the results.
if (self.toDoItems != nil) {
self.toDoItems = nil;
}
NSArray *dbResultArray = [[NSArray alloc] initWithArray:[self.dbManager loadDataFromDB:query]];
if (self.toDoItems) {
[self.toDoItems removeAllObjects];
}
else {
self.toDoItems = [NSMutableArray new];
}
for(NSArray *subArray in dbResultArray) {
[self.toDoItems addObject:[ToDoItem popToDoItemFromRow:subArray]];
}
// Reload the table view.
//[self.tblPeople reloadData];
[self.tableView reloadData];
}