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# removeObserver(_:fromObjectsAt:forKeyPath:context:)

Raises an exception.

```
func removeObserver(_ observer: NSObject, fromObjectsAt indexes: IndexSet, forKeyPath keyPath: String, context: UnsafeMutableRawPointer?)
```

## Parameters

`observer`

The object to remove as an observer.

`indexes`

The index set.

`keyPath`

A key-path, relative to the array, for which `observer` is registered to receive KVO change notifications. This value must not be `nil`.

`context`

The context passed to the notifications.

## Discussion

`NSArray` objects are not observable, so this method raises an exception when invoked on an `NSArray` object. Instead of observing an array, observe the to-many relationship for which the array is the collection of related objects.

---

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