I'm trying to understand key value observation in iOS but I think I'm not doing something correctly.
As an idea, I tried to add an observer to a view controller's property (a view connected with an IBOutlet). This view (tableIndicator) is animated so I wanted to see if I can get the observer to react when the view's frame changes.

So I did the following, inside the view controller's viewDidLoad:

```
[tableInidicator addObserver:self forKeyPath:@"frame" options:0 context:nil];

```

`tableIndicator` is my view/class property, I'm adding the view controller (self) as the observer, 0 for the default options and frame as the key value being observed.

Then, I'm waiting to see if this function is triggered as the frame changes:

```
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
    NSLog(@"value changed");
}

```

...but nothing happens. 

I'm not necessarily looking for fix to this code since it serves no purpose other than for me to understand it and I would be really grateful if someone could point out to me what I'm doing wrong. Some good examples/tutorials would be awesome too. 

The ones I found ( <http://iphonedevelopment.blogspot.ro/2009/02/kvo-and-iphone-sdk.html> / <http://nachbaur.com/blog/back-to-basics-using-kvo> ) did not cover such cases. They were only observers applied to a class to watch for one of its properties, not for the property of a (custom)object inside a class, something that I think would be more useful for me.

Thank you in advance

[edit]**For those who will miss my comment on the accepted answer:**

Changing a view's center will apparently not trigger an observer for the frame property. You have to change the frame itself.