这是我从sqlite文件加载数据的代码
- (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];
}
我使用NSLog
收到此错误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
具有讽刺意味的是，如果在viewDidLoad方法的末尾放在行下面，那么它就可以了。
self.dbManager = [[DBManager alloc] initWithDatabaseFilename:@"todotaskdb.sql"];
任何人都可以告诉我，我做错了什么？
答案 0 :(得分：2)
您的toDoItems包含包含您商品的数组！您可能正在获取数据库中单行的数组，因此您必须先将它们填充到单个toDoItems对象中。
也许您可以使用类似工厂的模式，使用popToDoItemFromRow:(NSArray *)row等方法返回此行的toDoItem。
然后在for (NSArray *subArray in dbResultArray)中为这些单行填充一个新数组。您应该在cellForRow ...
可能就像..
- (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];
}