所以我正在用可可构建一个应用程序并且遇到了一些麻烦。我想使用数组控制器将许多不同文件夹中的文本文件名提供给 tableview，但它不断抛出越界错误。这是一大段代码给我带来了麻烦。
[self clear:nil]; // method that clears the NSTableView
NSString *chooserSelection = chooserItems.titleOfSelectedItem; // gets the selected folder from an NSPopUpButton
if (chooserSelection == @"All") {
path = @"/Library/Application Support/File Folder/Files/";
NSArray *folders = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:nil];
NSLog(@"\nfolders = %@", folders);
for (int i = 0; i < [folders count]; i++) {
path = @"/Library/Application Support/File Folder/Files/";
NSMutableString *folderNames = [[NSMutableString stringWithString:path] init];
[folderNames insertString:folders[i] atIndex:folderNames.length];
[folderNames insertString:@"/" atIndex:folderNames.length];
NSArray *text = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:folderNames error:nil];
[myArrayController addObject: [NSMutableDictionary dictionaryWithObjectsAndKeys:text[i], @"File Name", nil]];
//This line gives the error
}
}
如果我将 [folders count] 更改为 1，它会显示在 NSTableView 中。然而，在任何过去的事情上（额外的通过 for 循环）我得到一个越界错误。
2013-02-26 13:17:49.679 AppName[3489:403] *** -[__NSArrayI objectAtIndex:]: index 1 beyond bounds [0 .. 0]
2013-02-26 13:17:49.683 AppName[3489:403] (
0 CoreFoundation 0x00007fff829b5f56 __exceptionPreprocess + 198
1 libobjc.A.dylib 0x00007fff84fe6d5e objc_exception_throw + 43
2 CoreFoundation 0x00007fff8295f370 -[__NSArrayI objectAtIndex:] + 208
3 AppName 0x000000010000159a -[AppDelegate tableView:objectValueForTableColumn:row:] + 106
4 AppKit 0x00007fff840a16e7 -[NSTableView _dataSourceValueForColumn:row:] + 73
5 AppKit 0x00007fff840a1167 -[NSTableView preparedCellAtColumn:row:] + 437
6 AppKit 0x00007fff840b2171 -[NSTableView _drawContentsAtRow:column:withCellFrame:] + 42
7 AppKit 0x00007fff840b05d8 -[NSTableView drawRow:clipRect:] + 1647
8 AppKit 0x00007fff840afdb5 -[NSTableView drawRowIndexes:clipRect:] + 565
9 AppKit 0x00007fff840aded7 -[NSTableView drawRect:] + 1390
10 AppKit 0x00007fff84197382 -[NSView(NSInternal) _recursive:displayRectIgnoringOpacity:inContext:topView:] + 1435
11 AppKit 0x00007fff841b564f __-[NSView(NSLayerKitGlue) drawLayer:inContext:]_block_invoke_1 + 94
12 AppKit 0x00007fff841b52fb -[NSView(NSLayerKitGlue) _drawViewBackingLayer:inContext:drawingHandler:] + 2001
13 QuartzCore 0x00007fff82c4a0dc -[CALayer drawInContext:] + 145
14 QuartzCore 0x00007fff82c49225 CABackingStoreUpdate_ + 3221
15 QuartzCore 0x00007fff82c4813a _ZN2CA5Layer8display_Ev + 1086
16 AppKit 0x00007fff841504e6 -[NSView(NSInternal) _recursiveDisplayViewsIntoLayersIfNeeded] + 163
17 AppKit 0x00007fff841505fc -[NSView(NSInternal) _recursiveDisplayViewsIntoLayersIfNeeded] + 441
18 AppKit 0x00007fff841505fc -[NSView(NSInternal) _recursiveDisplayViewsIntoLayersIfNeeded] + 441
19 AppKit 0x00007fff841505fc -[NSView(NSInternal) _recursiveDisplayViewsIntoLayersIfNeeded] + 441
20 AppKit 0x00007fff84150168 -[NSView(NSLayerKitGlue) _drawRectAsLayerTree:] + 128
21 AppKit 0x00007fff8401653e -[NSView _drawRect:clip:] + 4382
22 AppKit 0x00007fff8401406d -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 3020
23 AppKit 0x00007fff84014b5e -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 5821
24 AppKit 0x00007fff84012da3 -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 270
25 AppKit 0x00007fff8400e1bb -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 4755
26 AppKit 0x00007fff84006c35 -[NSView displayIfNeeded] + 1676
27 AppKit 0x00007fff84006375 _handleWindowNeedsDisplayOrLayoutOrUpdateConstraints + 648
28 CoreFoundation 0x00007fff829758e7 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
29 CoreFoundation 0x00007fff82975846 __CFRunLoopDoObservers + 374
30 CoreFoundation 0x00007fff8294aaf9 __CFRunLoopRun + 825
31 CoreFoundation 0x00007fff8294a486 CFRunLoopRunSpecific + 230
32 AppKit 0x00007fff84459b08 -[NSMenu _internalPerformActionForItemAtIndex:] + 38
33 AppKit 0x00007fff842e86f9 -[NSCarbonMenuImpl _carbonCommandProcessEvent:handlerCallRef:] + 138
34 AppKit 0x00007fff841349bb NSSLMMenuEventHandler + 339
35 HIToolbox 0x00007fff89d08234 _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 1263
36 HIToolbox 0x00007fff89d07840 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14HandlerCallRec + 446
37 HIToolbox 0x00007fff89d1e6db SendEventToEventTarget + 76
38 HIToolbox 0x00007fff89d647b5 _ZL18SendHICommandEventjPK9HICommandjjhPKvP20OpaqueEventTargetRefS5_PP14OpaqueEventRef + 398
39 HIToolbox 0x00007fff89e4be2d SendMenuCommandWithContextAndModifiers + 56
40 HIToolbox 0x00007fff89e935b5 SendMenuItemSelectedEvent + 253
41 HIToolbox 0x00007fff89d5d883 _ZL19FinishMenuSelectionP13SelectionDataP10MenuResultS2_ + 101
42 HIToolbox 0x00007fff89e8bfed _ZL19PopUpMenuSelectCoreP8MenuData5PointdS1_tjPK4RecttjS4_S4_PK10__CFStringPP13OpaqueMenuRefPt + 1660
43 HIToolbox 0x00007fff89e8c2ac _HandlePopUpMenuSelection7 + 621
44 AppKit 0x00007fff842eb3c5 _NSSLMPopUpCarbonMenu3 + 3860
45 AppKit 0x00007fff846990fa _NSPopUpCarbonMenu3 + 39
46 AppKit 0x00007fff842e952a -[NSCarbonMenuImpl popUpMenu:atLocation:width:forView:withSelectedItem:withFont:withFlags:withOptions:] + 322
47 AppKit 0x00007fff844ca1f1 -[NSPopUpButtonCell trackMouse:inRect:ofView:untilMouseUp:] + 564
48 AppKit 0x00007fff840cb7f6 -[NSControl mouseDown:] + 786
49 AppKit 0x00007fff84096c98 -[NSWindow sendEvent:] + 6306
50 AppKit 0x00007fff840303a5 -[NSApplication sendEvent:] + 5593
51 AppKit 0x00007fff83fc6a0e -[NSApplication run] + 555
52 AppKit 0x00007fff84242eac NSApplicationMain + 867
53 AppName 0x0000000100001152 main + 34
54 AppName 0x0000000100001124 start + 52
)
我还可以将 addObject 行添加到 for 循环下面的行，这将显示最后一个文件的文件名。但我无法弄清楚越界错误来自哪里。