[This is preliminary documentation and is subject to change.]
Defines options used when you observe a key path.
Namespace:
KNKVCAssembly: KNKVC (in KNKVC.dll) Version: 1.0.0.0 (1.0.0.0)
Syntax
| C# |
|---|
[FlagsAttribute] public enum KNKeyValueObservingOptions |
| Visual Basic (Declaration) |
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<FlagsAttribute> _ Public Enumeration KNKeyValueObservingOptions |
| Visual C++ |
|---|
[FlagsAttribute] public enum class KNKeyValueObservingOptions |
Members
| Member name | Description | |
|---|---|---|
| KNKeyValueObservingOptionNew |
If KNKeyValueObservingOptionNew is specified, the change dictionary will contain the new value
of the observed key path in the key KNKeyValueChangeNewKey This may be null.
| |
| KNKeyValueObservingOptionOld |
If KNKeyValueObservingOptionOld is specified, the change dictionary will contain the new value
of the observed key path in the key KNKeyValueChangeOldKey. This may be null.
| |
| KNKeyValueObservingOptionInitial |
If KNKeyValueObservingOptionInitial is specified, a KVO notification will be sent to the observer
before addObserverForKeyPath returns. If KNKeyValueObservingOptionNew is specified,
the change dictionary will contain the value for the given key path in the key KNKeyValueChangeNewKey.
| |
| KNKeyValueObservingOptionPrior |
If KNKeyValueObservingOptionPrior is specified, a KVO notification will be sent prior to the value changing as well
as after. A change notification send prior to the value changing will contain the boolean true under the
KNKeyValueChangeNotificationIsPriorKey key, and the current value under the KNKeyValueChangeOldKey if
KNKeyValueObservingOptionOld is specified. Prior notifications never contain the KNKeyValueChangeNewKey
key.
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