key-value-observing
What's wrong with this observeValueForKeyPath:ofObject:change:context: implementation?
In my UIScrollView subclass, I\'m observing frame changes: [self addObserver:self forKeyPath:@\"frame\" options:0 context:NULL];[详细]
2023-03-18 09:44 分类：问答iOS: How do I know if a property is KVO-compliant?
In the Key-Value Observing Programming Guide, the section Registering开发者_如何学Python for Key-Value Observing says \"Typically properties in Apple-supplied frameworks are only KVO-compliant if they[详细]
2023-03-17 19:50 分类：问答KVO and Core Data, Getting only the Changed Values through Observation
So I\'m fairly new to Core Data and KVO, but I have an NSManagedObject subclass that is successfully observing its own to-many relationship.The problem is, on observed changes, I want to iterate throu[详细]
2023-03-17 18:39 分类：问答GCD and KVO problems
My app is want to get the albums list of the iphone and all the photos in certain album. In the app I enumerate the photos in one album of the iphone.[详细]
2023-03-17 15:36 分类：问答SelectionIndexes on NSArrayController return just a value
I have a NSCollectionView wich content is handled by a NSArrayController. The NSCollectionView is selectable and I need to retrieve a list of selected elements.[详细]
2023-03-17 06:10 分类：问答NSMutableDictionary addition and removal KVO
I have a quick question regarding KVO. I understand that for a NSArray if observing additions is desired you can do the following.[详细]
2023-03-17 05:37 分类：问答How to observe the value of an NSTextField
This might seem straightforward, but the following code does not work, because the \"observeValueForKeyPath\" function is never called, although I keep changing the text in the NSTextfield:[详细]
2023-03-16 13:24 分类：问答Key Value Observing Cascading
Do change notifications cascade with KVO down to their properties or is there any elegant way that does not include implementing it manually by simply observing both parent and child changes?[详细]
2023-03-14 16:18 分类：问答Why is KVO retaining all of NSMutableArray's objects?
I\'m having a real pain trying to figure out why KVO is retaining all values that are being observed.[详细]
2023-03-14 08:49 分类：问答Objective-C undo manager questions
I\'m reading a book on Objective-c and learning about the undo manager.The concept seems very simple but the provided example seems overly complex.Basically, I have a table view connected to an NSArra[详细]
2023-03-12 23:03 分类：问答
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