NSTreeController的selectionIndexPaths在mouseDown后更新经常被中断
问题背景：
我有一个 NSOutlineView，其中每个 tableColumn 以编程方式绑定到 NSTreeController 的排列对象，因此不需要绑定 SelectionIndexPaths。 NSTreeController的arrangedObjects的来源是一个mutableArray。我通过在主线程上执行 - (void)insertObject:(id)object atArrangedObjectIndexPath:(NSIndexPath *)indexPath; 动态地将所有节点添加到 NSTreeController 中。我已经重写了 NSOutlineView 的 mouseDown 事件，如下所示： - (void)mouseDown:(NSEvent *)event { /*...myMethods...*/ [super mouseDown:event];问题
：
当节点添加得非常快并且我在outlineView上执行mouseDown事件时，通常会发生下一种情况：
将节点添加到TreeController的线程会中断调用的序列（我猜）通过 mouseDown 事件，因此在 setSelectionIndexPaths: 之前调用 insertObject: atArrangedObjectIndexPath:。这就是为什么outlineView中的新选择消失了，而treeController仍然具有旧版本的selectedIndexPaths。
我尝试了一种部分解决方案：阻止我的 insertObject: 方法（使用 @synthesized(outlineView)），以便它无法更改整个outlineView，但它经常线程冲突增加并且应用程序冻结。
有什么想法可以解决选择消失的问题吗？
Problem Background:
I have a NSOutlineView with every tableColumn binded programmatically to the NSTreeController's arrangedObjects so there is no need to bind selectionIndexPaths. The source of NSTreeController's arrangedObjects is a mutableArray. I'm adding all nodes to the NSTreeController dynamically by performing - (void)insertObject:(id)object atArrangedObjectIndexPath:(NSIndexPath *)indexPath; on main thread. I have overridden NSOutlineView's mouseDown event in the way like:- (void)mouseDown:(NSEvent *)event { /*...myMethods...*/ [super mouseDown:event]; }
The Problem:
When the nodes are being added very fast and I perform the mouseDown event on the outlineView, then very often the next situation takes place:
the thread that adds nodes to TreeController interrupts the sequence (I guess) called by mouseDown event so insertObject: atArrangedObjectIndexPath: is called before then setSelectionIndexPaths:. That's why the new selection in outlineView disappears and treeController still has the old version of selectedIndexPaths.
I've tried one partial solution: blocked my insertObject: method (with @synthesized(outlineView)) so that it couldn't change the entire of outlineView, but it often rises in thread conflict and app freezes.
Are there any ideas how to solve the problem with disappearing selections?
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将数据源更新线程中的语句与主事件循环 GCD 线程同步。这样，mouseDown 事件处理和数据源更新就得到完全序列化：
Synchronize the statements within the datasource update thread with the main-event-loop GCD thread. This way, mouseDown event handling and datasource updating get fully serialized: