disableUndoRegistration 仍然允许撤消操作
我想禁用 NSManagedObject 上的操作的撤消注册，但即使我显式调用disableUndoRegistration，它仍然会记录该操作。
我是否缺少一些明显的东西？
我还尝试分别在 viewWillAppear 和 viewWillDisappear 方法中启用/禁用。
这是一些示例代码...
#pragma mark -
#pragma mark NotesViewControllerDelegate methods
- (void)notesViewController:(NotesViewController *)controller didFinishWithSave:(BOOL)save
{
if (save)
{
[undoManager disableUndoRegistration];
[book setNotes:[controller getDataFromText]];
[undoManager enableUndoRegistration];
}
}
I want to disable undo registration for an operation on an NSManagedObject but it still records the operation even though I explicitly call disableUndoRegistration.
Is there something obvious I am missing?
I also tried to enable/disable in the viewWillAppear and viewWillDisappear methods, respectively.
Here is some example code...
#pragma mark -
#pragma mark NotesViewControllerDelegate methods
- (void)notesViewController:(NotesViewController *)controller didFinishWithSave:(BOOL)save
{
if (save)
{
[undoManager disableUndoRegistration];
[book setNotes:[controller getDataFromText]];
[undoManager enableUndoRegistration];
}
}
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您必须调用 [managementObjectContext processPendingChanges];在每个禁用和启用撤消注册的调用之前，因为核心数据队列更改为能够进行优化。
看
http://developer.apple.com/库/mac/#documentation/Cocoa/Conceptual/CoreData/Articles/cdUsingMOs.html
You have to call [managedObjectContext processPendingChanges]; before each of the calls that disable and enable the undo registration because Core Data queues changes to be able to do optimizations.
see
http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/CoreData/Articles/cdUsingMOs.html