Objective c 新NSManagedObject的Cocoa绑定
我是新来的，所以我会说明我在做什么，请纠正任何错误 在我的AppDelegate中，NSManagedObject子类Entry有一个@property。当我按下主窗口上的按钮创建新条目时，我首先实例化属性：Objective c 新NSManagedObject的Cocoa绑定,objective-c,cocoa,cocoa-bindings,Objective C,Cocoa,Cocoa Bindings,我是新来的，所以我会说明我在做什么，请纠正任何错误 在我的AppDelegate中，NSManagedObject子类Entry有一个@property。当我按下主窗口上的按钮创建新条目时，我首先实例化属性： _entry = (Entry*)[NSEntityDescription insertNewObjectForEntityForName:@"Entry" inManagedObjectContext:[se
_entry = (Entry*)[NSEntityDescription
insertNewObjectForEntityForName:@"Entry"
inManagedObjectContext:[self managedObjectContext]];
[inputWindow makeKeyAndOrderFront:nil];
[[self managedObjectContext] save:&error];
[inputWindow performClose:nil];
2014-01-11 22:57:32.906 WriteOffs[66441:303] CoreData: error: Failed to call designated initializer on NSManagedObject class 'Entry'
2014-01-11 22:57:32.943 WriteOffs[66441:303] An uncaught exception was raised
2014-01-11 22:57:32.943 WriteOffs[66441:303] [<Entry 0x6100000ba040> valueForUndefinedKey:]: the entity (null) is not key value coding-compliant for the key "date".
#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
@interface Entry : NSManagedObject
@property (nonatomic, retain) NSNumber * amount;
@property (nonatomic, retain) NSString * category;
@property (nonatomic, retain) NSDate * date;
@property (nonatomic, retain) NSString * payee;
@property (nonatomic, retain) NSString * text;
@end
Chet您的“Entry”类是否会覆盖NSManagedObject中的某些方法？甚至可能
- (id)initWithEntity:(NSEntityDescription *)entity insertIntoManagedObjectContext:(NSManagedObjectContext *)context;
如果是这样，您是否在子类的任何方法中都无法调用-super？在数组控制器中，我有一个模式：类引用入口类。我将其更改为模式：实体引用条目实体，然后一切都解决了： 有人能评论一下为什么调试器不善于给出有意义的响应吗？在错误消息中，哪里可以指出这是错误
2014-01-12 18:35:31.520 WriteOffs[68395:303] CoreData: error: Failed to call designated initializer on NSManagedObject class 'Entry'
2014-01-12 18:35:31.555 WriteOffs[68395:303] An uncaught exception was raised
2014-01-12 18:35:31.555 WriteOffs[68395:303] [<Entry 0x6100000a9a20> valueForUndefinedKey:]: the entity (null) is not key value coding-compliant for the key "date".
2014-01-12 18:35:31.556 WriteOffs[68395:303] (
0 CoreFoundation 0x00007fff8b93f41c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff944f3e75 objc_exception_throw + 43
2 CoreFoundation 0x00007fff8b93efc9 -[NSException raise] + 9
3 CoreData 0x00007fff89650b14 -[NSManagedObject valueForUndefinedKey:] + 276
4 Foundation 0x00007fff91eff49f -[NSObject(NSKeyValueCoding) valueForKeyPath:] + 334
5 AppKit 0x00007fff89c872d3 -[NSBinder valueForBinding:atIndex:resolveMarkersToPlaceholders:] + 408
6 AppKit 0x00007fff89963567 -[NSValueBinder _adjustObject:mode:observedController:observedKeyPath:context:editableState:adjustState:] + 622
7 AppKit 0x00007fff8a022008 -[NSValueBinder updateTableColumnDataCell:forDisplayAtIndex:] + 143
8 AppKit 0x00007fff89f9e2ee -[NSTextValueBinder updateTableColumnDataCell:forDisplayAtIndex:] + 73
9 CoreFoundation 0x00007fff8b873639 __53-[__NSArrayM enumerateObjectsWithOptions:usingBlock:]_block_invoke + 137
10 CoreFoundation 0x00007fff8b872ddf -[__NSArrayM enumerateObjectsWithOptions:usingBlock:] + 319
11 AppKit 0x00007fff8a062ac7 -[_NSBindingAdaptor tableColumn:willDisplayCell:row:] + 108
12 AppKit 0x00007fff89b8ada0 -[NSTableView preparedCellAtColumn:row:] + 615
13 AppKit 0x00007fff89b8a9ee -[NSTableView _drawContentsAtRow:column:withCellFrame:] + 44
14 AppKit 0x00007fff89b8a723 -[NSTableView drawRow:clipRect:] + 1629
15 AppKit 0x00007fff89b89f7d -[NSTableView drawRowIndexes:clipRect:] + 776
16 AppKit 0x00007fff89a534c2 -[NSTableView drawRect:] + 1484
17 AppKit 0x00007fff89a2c399 -[NSView _drawRect:clip:] + 3748
18 AppKit 0x00007fff89a2ac0e -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 1799
19 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
20 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
21 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
22 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
23 AppKit 0x00007fff89a28a50 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 841
24 AppKit 0x00007fff89a28201 -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 314
25 AppKit 0x00007fff89a25209 -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 2828
26 AppKit 0x00007fff89a0463a -[NSView displayIfNeeded] + 1680
27 AppKit 0x00007fff89a1e246 -[NSWindow _reallyDoOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 1972
28 AppKit 0x00007fff89a1d7f0 -[NSWindow _doOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 786
29 AppKit 0x00007fff89a1d470 -[NSWindow orderWindow:relativeTo:] + 162
30 AppKit 0x00007fff898bbc26 -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 1406
31 AppKit 0x00007fff898b05fe loadNib + 327
32 AppKit 0x00007fff898afb9c +[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:] + 288
33 AppKit 0x00007fff898af98c -[NSBundle(NSNibLoading) loadNibNamed:owner:topLevelObjects:] + 197
34 AppKit 0x00007fff898af77b +[NSBundle(NSNibLoading) loadNibNamed:owner:] + 357
35 AppKit 0x00007fff898ab617 NSApplicationMain + 448
36 WriteOffs 0x0000000100002e02 main + 34
37 libdyld.dylib 0x00007fff8eddf5fd start + 1
38 ??? 0x0000000000000003 0x0 + 3
)
2014-01-12 18:35:31.640 WriteOffs[68395:303] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<Entry 0x6100000a9a20> valueForUndefinedKey:]: the entity (null) is not key value coding-compliant for the key "date".'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff8b93f41c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff944f3e75 objc_exception_throw + 43
2 CoreFoundation 0x00007fff8b93efc9 -[NSException raise] + 9
3 CoreData 0x00007fff89650b14 -[NSManagedObject valueForUndefinedKey:] + 276
4 Foundation 0x00007fff91eff49f -[NSObject(NSKeyValueCoding) valueForKeyPath:] + 334
5 AppKit 0x00007fff89c872d3 -[NSBinder valueForBinding:atIndex:resolveMarkersToPlaceholders:] + 408
6 AppKit 0x00007fff89963567 -[NSValueBinder _adjustObject:mode:observedController:observedKeyPath:context:editableState:adjustState:] + 622
7 AppKit 0x00007fff8a022008 -[NSValueBinder updateTableColumnDataCell:forDisplayAtIndex:] + 143
8 AppKit 0x00007fff89f9e2ee -[NSTextValueBinder updateTableColumnDataCell:forDisplayAtIndex:] + 73
9 CoreFoundation 0x00007fff8b873639 __53-[__NSArrayM enumerateObjectsWithOptions:usingBlock:]_block_invoke + 137
10 CoreFoundation 0x00007fff8b872ddf -[__NSArrayM enumerateObjectsWithOptions:usingBlock:] + 319
11 AppKit 0x00007fff8a062ac7 -[_NSBindingAdaptor tableColumn:willDisplayCell:row:] + 108
12 AppKit 0x00007fff89b8ada0 -[NSTableView preparedCellAtColumn:row:] + 615
13 AppKit 0x00007fff89b8a9ee -[NSTableView _drawContentsAtRow:column:withCellFrame:] + 44
14 AppKit 0x00007fff89b8a723 -[NSTableView drawRow:clipRect:] + 1629
15 AppKit 0x00007fff89b89f7d -[NSTableView drawRowIndexes:clipRect:] + 776
16 AppKit 0x00007fff89a534c2 -[NSTableView drawRect:] + 1484
17 AppKit 0x00007fff89a2c399 -[NSView _drawRect:clip:] + 3748
18 AppKit 0x00007fff89a2ac0e -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 1799
19 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
20 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
21 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
22 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
23 AppKit 0x00007fff89a28a50 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 841
24 AppKit 0x00007fff89a28201 -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 314
25 AppKit 0x00007fff89a25209 -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 2828
26 AppKit 0x00007fff89a0463a -[NSView displayIfNeeded] + 1680
27 AppKit 0x00007fff89a1e246 -[NSWindow _reallyDoOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 1972
28 AppKit 0x00007fff89a1d7f0 -[NSWindow _doOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 786
29 AppKit 0x00007fff89a1d470 -[NSWindow orderWindow:relativeTo:] + 162
30 AppKit 0x00007fff898bbc26 -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 1406
31 AppKit 0x00007fff898b05fe loadNib + 327
32 AppKit 0x00007fff898afb9c +[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:] + 288
33 AppKit 0x00007fff898af98c -[NSBundle(NSNibLoading) loadNibNamed:owner:topLevelObjects:] + 197
34 AppKit 0x00007fff898af77b +[NSBundle(NSNibLoading) loadNibNamed:owner:] + 357
35 AppKit 0x00007fff898ab617 NSApplicationMain + 448
36 WriteOffs 0x0000000100002e02 main + 34
37 libdyld.dylib 0x00007fff8eddf5fd start + 1
38 ??? 0x0000000000000003 0x0 + 3
)
libc++abi.dylib: terminating with uncaught exception of type NSException
我没有在Entry.m中编写任何方法。我已经注释掉了几乎所有的代码。我所拥有的只是AppDelegate中的一个/@属性和关联的/@synthesis，我仍然得到这个错误。我认为所发生的事情是，在实例化绑定对象之前，条目窗口立即被加载。我尝试在awakeFromNib中实例化实体，但没有成功。我真的不确定我在这里做什么。感谢您的帮助您是否尝试记录self.managedObjectContext以确保它不是零？你能发布你的Entry.h和Entry.m的剩余内容吗？删除注释掉的部分，这样我们就可以看到代码了？不知道在哪里登录self.managedObjectContext。我把它放在ApplicationIDFinishLaunching中，程序在启动前崩溃了。有关更多代码和问题解释，请参见我的编辑。
#import "Entry.h"
@implementation Entry
@dynamic amount;
@dynamic category;
@dynamic date;
@dynamic images;
@dynamic payee;
@dynamic text;
@end
- (id)initWithEntity:(NSEntityDescription *)entity insertIntoManagedObjectContext:(NSManagedObjectContext *)context;
2014-01-12 18:35:31.520 WriteOffs[68395:303] CoreData: error: Failed to call designated initializer on NSManagedObject class 'Entry'
2014-01-12 18:35:31.555 WriteOffs[68395:303] An uncaught exception was raised
2014-01-12 18:35:31.555 WriteOffs[68395:303] [<Entry 0x6100000a9a20> valueForUndefinedKey:]: the entity (null) is not key value coding-compliant for the key "date".
2014-01-12 18:35:31.556 WriteOffs[68395:303] (
0 CoreFoundation 0x00007fff8b93f41c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff944f3e75 objc_exception_throw + 43
2 CoreFoundation 0x00007fff8b93efc9 -[NSException raise] + 9
3 CoreData 0x00007fff89650b14 -[NSManagedObject valueForUndefinedKey:] + 276
4 Foundation 0x00007fff91eff49f -[NSObject(NSKeyValueCoding) valueForKeyPath:] + 334
5 AppKit 0x00007fff89c872d3 -[NSBinder valueForBinding:atIndex:resolveMarkersToPlaceholders:] + 408
6 AppKit 0x00007fff89963567 -[NSValueBinder _adjustObject:mode:observedController:observedKeyPath:context:editableState:adjustState:] + 622
7 AppKit 0x00007fff8a022008 -[NSValueBinder updateTableColumnDataCell:forDisplayAtIndex:] + 143
8 AppKit 0x00007fff89f9e2ee -[NSTextValueBinder updateTableColumnDataCell:forDisplayAtIndex:] + 73
9 CoreFoundation 0x00007fff8b873639 __53-[__NSArrayM enumerateObjectsWithOptions:usingBlock:]_block_invoke + 137
10 CoreFoundation 0x00007fff8b872ddf -[__NSArrayM enumerateObjectsWithOptions:usingBlock:] + 319
11 AppKit 0x00007fff8a062ac7 -[_NSBindingAdaptor tableColumn:willDisplayCell:row:] + 108
12 AppKit 0x00007fff89b8ada0 -[NSTableView preparedCellAtColumn:row:] + 615
13 AppKit 0x00007fff89b8a9ee -[NSTableView _drawContentsAtRow:column:withCellFrame:] + 44
14 AppKit 0x00007fff89b8a723 -[NSTableView drawRow:clipRect:] + 1629
15 AppKit 0x00007fff89b89f7d -[NSTableView drawRowIndexes:clipRect:] + 776
16 AppKit 0x00007fff89a534c2 -[NSTableView drawRect:] + 1484
17 AppKit 0x00007fff89a2c399 -[NSView _drawRect:clip:] + 3748
18 AppKit 0x00007fff89a2ac0e -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 1799
19 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
20 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
21 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
22 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
23 AppKit 0x00007fff89a28a50 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 841
24 AppKit 0x00007fff89a28201 -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 314
25 AppKit 0x00007fff89a25209 -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 2828
26 AppKit 0x00007fff89a0463a -[NSView displayIfNeeded] + 1680
27 AppKit 0x00007fff89a1e246 -[NSWindow _reallyDoOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 1972
28 AppKit 0x00007fff89a1d7f0 -[NSWindow _doOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 786
29 AppKit 0x00007fff89a1d470 -[NSWindow orderWindow:relativeTo:] + 162
30 AppKit 0x00007fff898bbc26 -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 1406
31 AppKit 0x00007fff898b05fe loadNib + 327
32 AppKit 0x00007fff898afb9c +[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:] + 288
33 AppKit 0x00007fff898af98c -[NSBundle(NSNibLoading) loadNibNamed:owner:topLevelObjects:] + 197
34 AppKit 0x00007fff898af77b +[NSBundle(NSNibLoading) loadNibNamed:owner:] + 357
35 AppKit 0x00007fff898ab617 NSApplicationMain + 448
36 WriteOffs 0x0000000100002e02 main + 34
37 libdyld.dylib 0x00007fff8eddf5fd start + 1
38 ??? 0x0000000000000003 0x0 + 3
)
2014-01-12 18:35:31.640 WriteOffs[68395:303] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<Entry 0x6100000a9a20> valueForUndefinedKey:]: the entity (null) is not key value coding-compliant for the key "date".'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff8b93f41c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff944f3e75 objc_exception_throw + 43
2 CoreFoundation 0x00007fff8b93efc9 -[NSException raise] + 9
3 CoreData 0x00007fff89650b14 -[NSManagedObject valueForUndefinedKey:] + 276
4 Foundation 0x00007fff91eff49f -[NSObject(NSKeyValueCoding) valueForKeyPath:] + 334
5 AppKit 0x00007fff89c872d3 -[NSBinder valueForBinding:atIndex:resolveMarkersToPlaceholders:] + 408
6 AppKit 0x00007fff89963567 -[NSValueBinder _adjustObject:mode:observedController:observedKeyPath:context:editableState:adjustState:] + 622
7 AppKit 0x00007fff8a022008 -[NSValueBinder updateTableColumnDataCell:forDisplayAtIndex:] + 143
8 AppKit 0x00007fff89f9e2ee -[NSTextValueBinder updateTableColumnDataCell:forDisplayAtIndex:] + 73
9 CoreFoundation 0x00007fff8b873639 __53-[__NSArrayM enumerateObjectsWithOptions:usingBlock:]_block_invoke + 137
10 CoreFoundation 0x00007fff8b872ddf -[__NSArrayM enumerateObjectsWithOptions:usingBlock:] + 319
11 AppKit 0x00007fff8a062ac7 -[_NSBindingAdaptor tableColumn:willDisplayCell:row:] + 108
12 AppKit 0x00007fff89b8ada0 -[NSTableView preparedCellAtColumn:row:] + 615
13 AppKit 0x00007fff89b8a9ee -[NSTableView _drawContentsAtRow:column:withCellFrame:] + 44
14 AppKit 0x00007fff89b8a723 -[NSTableView drawRow:clipRect:] + 1629
15 AppKit 0x00007fff89b89f7d -[NSTableView drawRowIndexes:clipRect:] + 776
16 AppKit 0x00007fff89a534c2 -[NSTableView drawRect:] + 1484
17 AppKit 0x00007fff89a2c399 -[NSView _drawRect:clip:] + 3748
18 AppKit 0x00007fff89a2ac0e -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 1799
19 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
20 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
21 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
22 AppKit 0x00007fff89a2afea -[NSView _recursiveDisplayAllDirtyWithLockFocus:visRect:] + 2787
23 AppKit 0x00007fff89a28a50 -[NSView _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 841
24 AppKit 0x00007fff89a28201 -[NSThemeFrame _recursiveDisplayRectIfNeededIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:topView:] + 314
25 AppKit 0x00007fff89a25209 -[NSView _displayRectIgnoringOpacity:isVisibleRect:rectIsVisibleRectForView:] + 2828
26 AppKit 0x00007fff89a0463a -[NSView displayIfNeeded] + 1680
27 AppKit 0x00007fff89a1e246 -[NSWindow _reallyDoOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 1972
28 AppKit 0x00007fff89a1d7f0 -[NSWindow _doOrderWindow:relativeTo:findKey:forCounter:force:isModal:] + 786
29 AppKit 0x00007fff89a1d470 -[NSWindow orderWindow:relativeTo:] + 162
30 AppKit 0x00007fff898bbc26 -[NSIBObjectData nibInstantiateWithOwner:topLevelObjects:] + 1406
31 AppKit 0x00007fff898b05fe loadNib + 327
32 AppKit 0x00007fff898afb9c +[NSBundle(NSNibLoading) _loadNibFile:nameTable:withZone:ownerBundle:] + 288
33 AppKit 0x00007fff898af98c -[NSBundle(NSNibLoading) loadNibNamed:owner:topLevelObjects:] + 197
34 AppKit 0x00007fff898af77b +[NSBundle(NSNibLoading) loadNibNamed:owner:] + 357
35 AppKit 0x00007fff898ab617 NSApplicationMain + 448
36 WriteOffs 0x0000000100002e02 main + 34
37 libdyld.dylib 0x00007fff8eddf5fd start + 1
38 ??? 0x0000000000000003 0x0 + 3
)
libc++abi.dylib: terminating with uncaught exception of type NSException