我在 NSTabView 的一個選項卡中嵌入了一個 NSCollectionView。該集合已加載并正確顯示，但在切換到任何其他選項卡時，應用程式崩潰并顯示以下崩潰日志。崩潰指出，不能為關鍵路徑“firstResponder”洗掉觀察者（ProjectTabLeadersCollection，它是我的 NSCollectionView 的類）。我不確定到底發生了什么，因為我沒有為這個選項卡明確注冊任何觀察者，所以我假設 AppKit 在幕后做一些事情，并且我在 Interface Builder 或我的初始化代碼中進行設定不太正確。希望有人可以在這里提供一些指導。
有任何想法嗎？
2022-04-12 07:21:53.861124-0700 APBA Baseball[78639:4002869] [General] Cannot remove an observer <ProjectTabLeadersCollection 0x7f9e6b8df1e0> for the key path "firstResponder" from <NSWindow 0x7f9e7c044500> because it is not registered as an observer.
2022-04-12 07:21:53.864095-0700 APBA Baseball[78639:4002869] [General] (
0 CoreFoundation 0x00007ff809bf41e3 __exceptionPreprocess 242
1 libobjc.A.dylib 0x00007ff809954c13 objc_exception_throw 48
2 Foundation 0x00007ff80a9bf1ff -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:] 700
3 Foundation 0x00007ff80a9beeff -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] 129
4 AppKit 0x00007ff80c77f736 -[NSCollectionView viewWillMoveToWindow:] 274
5 AppKit 0x00007ff80c5b449a -[NSView _setWindow:] 277
6 AppKit 0x00007ff80ce04884 __21-[NSView _setWindow:]_block_invoke.425 299
7 CoreAutoLayout 0x00007ff811211cf3 -[NSISEngine withBehaviors:performModifications:] 84
8 AppKit 0x00007ff80c5b4b04 -[NSView _setWindow:] 1919
9 AppKit 0x00007ff80ce04884 __21-[NSView _setWindow:]_block_invoke.425 299
10 CoreAutoLayout 0x00007ff811211cf3 -[NSISEngine withBehaviors:performModifications:] 84
11 AppKit 0x00007ff80c5b4b04 -[NSView _setWindow:] 1919
12 AppKit 0x00007ff80c62f07e -[NSScrollView _setWindow:] 93
13 AppKit 0x00007ff80ce04884 __21-[NSView _setWindow:]_block_invoke.425 299
14 CoreAutoLayout 0x00007ff811211cf3 -[NSISEngine withBehaviors:performModifications:] 84
15 AppKit 0x00007ff80c5b4b04 -[NSView _setWindow:] 1919
16 AppKit 0x00007ff80c5e3d8f -[NSView removeFromSuperview] 158
17 AppKit 0x00007ff80c7a230f __56-[NSView replaceSubview:with:options:completionHandler:]_block_invoke 40
18 AppKit 0x00007ff80c7a2106 -[NSView replaceSubview:with:options:completionHandler:] 735
19 AppKit 0x00007ff80c77996b -[NSTabView _switchTabViewItem:oldView:withTabViewItem:newView:initialFirstResponder:lastKeyView:] 859
20 AppKit 0x00007ff80c772e21 -[NSTabView selectTabViewItem:] 512
21 AppKit 0x00007ff80c7791b3 -[NSTabViewController setSelectedTabViewItemIndex:] 637
22 AppKit 0x00007ff80c7a16fe -[NSApplication(NSResponder) sendAction:to:from:] 288
23 AppKit 0x00007ff80c7a15a4 -[NSControl sendAction:to:] 86
24 AppKit 0x00007ff80c7a14d6 __26-[NSCell _sendActionFrom:]_block_invoke 131
25 AppKit 0x00007ff80c7a13df -[NSCell _sendActionFrom:] 171
26 AppKit 0x00007ff80c89c311 -[NSSegmentedCell _sendActionFrom:] 161
27 AppKit 0x00007ff80c79e19f NSControlTrackMouse 1813
28 AppKit 0x00007ff80c79da66 -[NSCell trackMouse:inRect:ofView:untilMouseUp:] 121
29 AppKit 0x00007ff80c89ba45 -[NSSegmentedCell trackMouse:inRect:ofView:untilMouseUp:] 712
30 AppKit 0x00007ff80c79cd06 -[NSControl mouseDown:] 678
31 AppKit 0x00007ff80c79b1f1 -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] 4859
32 AppKit 0x00007ff80c70f39e -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] 2582
33 AppKit 0x00007ff80c70e76e -[NSWindow(NSEventRouting) sendEvent:] 352
34 AppKit 0x00007ff80c70cb44 -[NSApplication(NSEvent) sendEvent:] 352
35 AppKit 0x00007ff80c9c596b -[NSApplication _handleEvent:] 65
36 AppKit 0x00007ff80c58e35e -[NSApplication run] 623
37 AppKit 0x00007ff80c5622b7 NSApplicationMain 817
38 APBA Baseball 0x00000001058f8e22 main 34
39 dyld 0x0000000109b1951e start 462
我的標簽視圖設定如下：
NSCollection 位于名為 Leaders 的選項卡內，連接顯示如下：
這是集合的標題：
@interface ProjectTabLeadersCollection : NSCollectionView <NSCollectionViewDataSource, NSCollectionViewDelegate> {
NSMutableArray *ar;
}
@end
接下來，.m 檔案：
#import "ProjectTabLeadersCollection.h"
#import "ProjectTabLeadersCollectionItem.h"
@implementation ProjectTabLeadersCollection
-(void) viewDidMoveToWindow {
self.delegate = self;
self.dataSource = self;
ar = [[NSMutableArray alloc] init];
for (int i = 0; i < 100; i)
[ar addObject:@"Hello"];
}
- (void)collectionView:(NSCollectionView *)collectionView willDisplayItem:(nonnull NSCollectionViewItem *)item forRepresentedObjectAtIndexPath:(nonnull NSIndexPath *)indexPath {
}
- (void)collectionView:(NSCollectionView *)collectionView didEndDisplayingItem:(nonnull NSCollectionViewItem *)item forRepresentedObjectAtIndexPath:(nonnull NSIndexPath *)indexPath {
}
- (NSInteger) numberOfSectionsInCollectionView:(NSCollectionView *)collectionView {
return (1);
}
- (NSInteger) collectionView:(NSCollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return (ar.count);
}
- (NSCollectionViewItem *) collectionView:(NSCollectionView *)collectionView itemForRepresentedObjectAtIndexPath:(NSIndexPath *)indexPath
{
ProjectTabLeadersCollectionItem *item = [collectionView makeItemWithIdentifier:@"ProjectTabLeadersCollectionItem" forIndexPath:indexPath];
item->StatNameLabel.stringValue = [ar objectAtIndex:[indexPath item]];
return (item);
// ProjectTabStandingsCollectionItem *item = [collectionView makeItemWithIdentifier:@"ProjectTabStandingsCollectionItem" forIndexPath:indexPath];
// ProjectTeamObject *pto = [standings objectAtIndex:[indexPath item]];
//
// item->StandingsLabel.stringValue = pto.profile.city;
// return (item);
}
- (void)drawRect:(NSRect)dirtyRect {
[super drawRect:dirtyRect];
// Drawing code here.
}
@end
uj5u.com熱心網友回復：
viewDidMoveToWindow國家檔案
默認實作什么都不做
但[NSCollectionView viewDidMoveToWindow]已實作并開始觀察firstResponder視窗。-[ProjectTabLeadersCollection viewDidMoveToWindow]必須呼叫super。
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標籤：目标-c 苹果系统 调试 nscollectionview nstabview