Executive summary: I am trying to use UITableViewmy main window as a subquery; it appears, but when I scroll the window, I get the following error message:
2010-11-20 17:17:51.958 xwtf[6997:207] -[NSCFString tableView:cellForRowAtIndexPath:]: unrecognized selector sent to instance 0x5f46550
I have a subclass ViewControllerwith the corresponding NIB file that is loaded by my application delegate. This is your typical new project template. In this NIB file, I add UITableViewas a subview submission. In Interface Builder, I occupy it the size of the entire window (i.e. completely overlaps its parent view).
Now I need to specify the data source and the delegate. I create a class with the name DumbTableHelperas follows:
@interface DumbTableHelper : NSObject<UITableViewDelegate, UITableViewDataSource> {
}
So this is not a subclass UIViewController, but I am trying to keep it simple - all I need is a delegate and a data source that it can call to, right? Besides dealloc, my methods in the .m file:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView
numberOfRowsInSection:(NSInteger)section {
return 10;
}
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"DumbTableCell";
UITableViewCell *cell = [tableView
dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:CellIdentifier]
autorelease];
}
return cell;
}
As you can see, I am not even setting up any cell; I just specify 10 lines, which is enough to force scroll. In any case, in Interface Builder, I drag an object from the library to my NIB. Then I change the name of my class to DumbTableHelperand point it as the data source and the delegate from UITableViewthere already. When I run it, a table will appear. When I try to scroll down in a table, I get:
010-11-20 18:19:54.673 xwtf[6997:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString tableView:cellForRowAtIndexPath:]: unrecognized selector sent to instance 0x5f46550'
*** Call stack at first throw:
(
0 CoreFoundation 0x0259eb99 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x0239340e objc_exception_throw + 47
2 CoreFoundation 0x025a06ab -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x025102b6 ___forwarding___ + 966
4 CoreFoundation 0x0250fe72 _CF_forwarding_prep_0 + 50
5 UIKit 0x00321d6f -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:withIndexPath:] + 619
6 UIKit 0x00317e02 -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:] + 75
7 UIKit 0x0032c69f -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow:] + 1348
8 UIKit 0x003247ec -[UITableView layoutSubviews] + 242
9 QuartzCore 0x0455c481 -[CALayer layoutSublayers] + 177
10 QuartzCore 0x0455c1b1 CALayerLayoutIfNeeded + 220
11 QuartzCore 0x045552e0 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 302
12 QuartzCore 0x04555040 _ZN2CA11Transaction6commitEv + 292
13 QuartzCore 0x04585ebb _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 99
14 CoreFoundation 0x0257ff4b __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 27
15 CoreFoundation 0x02514b27 __CFRunLoopDoObservers + 295
16 CoreFoundation 0x024ddce7 __CFRunLoopRun + 1575
17 CoreFoundation 0x024dd350 CFRunLoopRunSpecific + 208
18 CoreFoundation 0x024dd271 CFRunLoopRunInMode + 97
19 GraphicsServices 0x02d5d00c GSEventRunModal + 217
20 GraphicsServices 0x02d5d0d1 GSEventRun + 115
21 UIKit 0x002beaf2 UIApplicationMain + 1160
22 xwtf 0x00001af4 main + 102
23 xwtf 0x00001a85 start + 53
)
So it calls tableView:cellForRowAtIndexPath:on a .. String? Does anyone have any ideas?
, - UITableViewController, UITableView , doesn " . Apple iPhone, , , .
!