Open Radar

 
03-Mar-2010 11:32 PM Joachim Bengtsson:
Summary:
Registering for observations on the "value" key of a UISlider yields a single notification when manipulation of the control starts, and none during (even if it is continuous), nor after manipulation ends. This is pretty useless.

Steps to Reproduce:
1. Add a UISlider to a view.
2. Add an observation like so:
	[slider addObserver:self
			 forKeyPath:@"value"
				options:NSKeyValueObservingOptionNew
				context:NULL];
3. Receive notifications in
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context

Expected Results:
4. Notifications come in once when manipulation ends, and continuously if the slider is continuous; never when manipulation begins.

Actual Results:
4. Notifications come in when manipulation begins.

Regression:
Unknown.

Notes:
What.