Instance Method インスタンスメソッド

didChangeValueForKey:

Informs the observed object that the value of a given property has changed.

Declaration 宣言 

- (void)didChangeValueForKey:(NSString *)key;

Parameters パラメータ

key

The name of the property that changed.

Discussion 解説

Use this method when implementing key-value observer compliance manually to inform the observed object that the value at key has just changed. Calls to this method are always paired with a matching call to willChangeValueForKey:.

Special Considerations 特別な注意事項

You rarely need to override this method in subclasses, but if you do, be sure to call super.

See Also 参照

Notifying Observers of Changes

- willChangeValueForKey:
Informs the observed object that the value of a given property is about to change.
- willChange:valuesAtIndexes:forKey:
Informs the observed object that the specified change is about to be executed at given indexes for a specified ordered to-many relationship.
- didChange:valuesAtIndexes:forKey:
Informs the observed object that the specified change has occurred on the indexes for a specified ordered to-many relationship.
- willChangeValueForKey:withSetMutation:usingObjects:
Informs the observed object that the specified change is about to be made to a specified unordered to-many relationship.
- didChangeValueForKey:withSetMutation:usingObjects:
Informs the observed object that the specified change was made to a specified unordered to-many relationship.