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In order to be considered KVO-compliant for a specific property, a class must ensure the following:
Manual Change Notification. In some cases, you may want control of the notification process, for example, to minimize triggering notifications that are unnecessary for application specific reasons, or to group a number of changes into a single notification. Manual change notification provides means to do this. After a device is enrolled in Profile Manager, you can create a device group and automatically assign apps to all the devices within the group. Distribute apps and books with Profile Manager To browse the Profile Manager User Guide, click Table of Contents at the top of the page.
- The class must be key-value coding compliant for the property, as specified in Ensuring KVC Compliance.KVO supports the same data types as KVC, including Objective-C objects and the scalars and structures listed in Scalar and Structure Support.
- The class emits KVO change notifications Mac os el capitan user manual. for the property.
- Dependent keys are registered appropriately (see Registering Dependent Keys).
Manual de usuario mac 3200. There are two techniques for ensuring the change notifications are emitted. Automatic support is provided by
NSObject
and is by default available for all properties of a class that are key-value coding compliant. Typically, if you follow standard Cocoa coding and naming conventions, you can use automatic change notifications—you don’t have to write any additional code.Manual change notification provides additional control over when notifications are emitted, and requires additional coding. You can control automatic notifications for properties of your subclass by implementing the class method
automaticallyNotifiesObserversForKey:
.Automatic Change Notification
NSObject
provides a basic implementation of automatic key-value change notification. Automatic key-value change notification informs observers of changes made using key-value compliant accessors, as well as the key-value coding methods. Automatic notification is also supported by the collection proxy objects returned by, for example, mutableArrayValueForKey:
. The examples shown in Listing 1 result in any observers of the property
name
to be notified of the change.Listing 1 Examples of method calls that cause KVO change notifications to be emitted
Manual Change Notification
In some cases, you may want control of the notification process, for example, to minimize triggering notifications that are unnecessary for application specific reasons, or to group a number of changes into a single notification. Manual change notification provides means to do this.
Manual and automatic notifications are not mutually exclusive. You are free to issue manual notifications in addition to the automatic ones already in place. More typically, you may want to completely take control of the notifications for a particular property. In this case, you override the
NSObject
implementation of automaticallyNotifiesObserversForKey:
. For properties whose automatic notifications you want to preclude, the subclass implementation of automaticallyNotifiesObserversForKey:
should return NO
. A subclass implementation should invoke super for any unrecognized keys. The example in Listing 2 enables manual notification for the balance
property, allowing the superclass to determine the notification for all other keys.Manual Notification Mac Profile Photos
Listing 2 Example implementation of automaticallyNotifiesObserversForKey:
To implement manual observer notification, you invoke
willChangeValueForKey:
before changing the value, and didChangeValueForKey:
after changing the value. The example in Listing 3 implements manual notifications for the balance
property. Listing 3 Example accessor method implementing manual notification
You can minimize sending unnecessary notifications by first checking if the value has changed. The example in Listing 4 tests the value of
balance
and only provides the notification if it has changed.Listing 4 Testing the value for change before providing notification
If a single operation causes multiple keys to change you must nest the change notifications as shown in Listing 5.
Listing 5 Nesting change notifications for multiple keys
In the case of an ordered to-many relationship, you must specify not only the key that changed, but also the type of change and the indexes of the objects involved. The type of change is an
NSKeyValueChange
that specifies NSKeyValueChangeInsertion
, NSKeyValueChangeRemoval
, or NSKeyValueChangeReplacement
. The indexes of the affected objects are passed as an NSIndexSet
object.The code fragment in Listing 6 demonstrates how to wrap a deletion of objects in the to-many relationship
transactions
.Manual Notification Mac Profile Photos
Listing 6 Implementation of manual observer notification in a to-many relationship
Manual Notification Mac Profile Update
Manual Notification Mac Profile Images
Manual Notification Mac Profile 2017
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