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要处理 Drag-n-Drop,请执行以下操作,

-(void)InitMyOutlineView{
 - - - - -  - - - - - - - -  -- - - - - - - -  -
 - - - - - - - - - - - - - -- -- - - - - - - - - 
[pMyOutlineView registerForDraggedTypes:
     [NSArray arrayWithObject:NSStringPboardType]];

/* I tried both Yes and No */   
[pMyOutlineView setDraggingSourceOperationMask:NSDragOperationEvery forLocal:NO];
- - - -  -- - - - - - -- - - - - - - -- - - - - - 
- -- -- - - - - -- - - - - - - - - - -  - -- - - - 
}

WriteItem 方法如下,

- (BOOL)outlineView:(NSOutlineView *)outlineView writeItems:(NSArray *)items toPasteboard:(NSPasteboard *)pboard{
    [self log:@"write Items"];
    NSString *pStr = [NSString stringWithFormat:@"this is the temp string "];
       [pboard declareTypes:[NSArray arrayWithObject:NSStringPboardType] owner:self];
       [pboard setString:pStr forType:NSStringPboardType];
       [self log:@"returning YES"];
       return YES;
}

现在我期待控制将来到 AcceptDrop 方法,但断点没有打到那里,并且在 Log/gdb 中得到以下日志

2011-02-04 16:21:25.435 MyApp[2006:a0f] write Items
2011-02-04 16:21:25.437 MyApp[2006:a0f] returning YES
2011-02-04 16:21:25.439 MyApp[2006:a0f] *** -[NSCFArray initWithObjects:count:]: attempt to insert nil object at objects[0]

并且控制没有来acceptDrop方法,

当我启用“异常停止”时,以下是它停止时的调用堆栈,

#0  0x981b94e6 in objc_exception_throw
#1  0x96ed34cf in -[__NSPlaceholderArray initWithObjects:count:]
#2  0x96efaaa3 in +[NSArray arrayWithObject:]
#3  0x92316dfd in -[NSOutlineView _columnsForDragImage]
#4  0x923f1e32 in -[NSTableView _doImageDragUsingRowsWithIndexes:event:pasteboard:source:slideBack:startRow:]
#5  0x91fea16a in -[NSTableView _performDragFromMouseDown:]
#6  0x91fe89b9 in -[NSTableView mouseDown:]
#7  0x91fe864e in -[NSOutlineView mouseDown:]
#8  0x91f86c68 in -[NSWindow sendEvent:]
#9  0x91e9f817 in -[NSApplication sendEvent:]
#10 0x91e332a7 in -[NSApplication run]
#11 0x91e2b2d9 in NSApplicationMain

让我再更新一件事,在我的大纲视图中,我有自定义单元格,它只是我正在使用的 Mac ImageTextCell 接口文件。

谁能指导我,我做错了什么

亲切的问候罗汉

4

2 回答 2

2

[myoutlineView setOutlineColoumn : firstColumn] 丢失了,当我添加然后它的工作时

于 2011-02-07T15:14:58.867 回答
0

确保您在 Xcode 的 Debug 菜单中打开了“Stop on Objective-C Exceptions”,然后在调试器下运行您的应用程序(启用断点)。抛出异常时调试器将停止,然后您可以调查您尝试在哪里创建带有nil对象的数组。

我发现您显示的代码不太可能是问题的根源,因为您正在传递一个在 AppKit 框架中全局定义的字符串。

于 2011-02-04T17:30:25.843 回答