Type Method
型メソッド
automaticallyNotifiesObserversForKey:
Returns a Boolean value that indicates whether the observed object supports automatic key-value observation for the given key.
Declaration
宣言
+ (BOOL)automaticallyNotifiesObserversForKey:(NSString *)key;
Return Value
戻り値
YES if the key-value observing machinery should automatically invoke willChangeValueForKey:/didChangeValueForKey: and willChange:valuesAtIndexes:forKey:/didChange:valuesAtIndexes:forKey: whenever instances of the class receive key-value coding messages for the key, or mutating key-value-coding-compliant methods for the key are invoked; otherwise NO.
Discussion
解説
The default implementation returns YES. Starting in OS X 10.5, the default implementation of this method searches the receiving class for a method whose name matches the pattern +automaticallyNotifiesObserversOf<Key>, and returns the result of invoking that method if it is found. Any found methods must return BOOL. If no such method is found YES is returned.
See Also
参照
Observing Customization
observationInfo
Returns a pointer that identifies information about all of the observers that are registered with the observed object.