---
title: "validateValue(_:forKeyPath:)"
framework: objectivec
role: symbol
role_heading: Instance Method
path: "objectivec/nsobject-swift.class/validatevalue(_:forkeypath:)"
---

# validateValue(_:forKeyPath:)

Indicates whether the value specified by a given pointer is not valid for a given key path relative to the receiver.

## Declaration

```swift
func validateValue(_ ioValue: AutoreleasingUnsafeMutablePointer<AnyObject?>, forKeyPath inKeyPath: String) throws
```

## Parameters

- `ioValue`: A pointer to a new value for the property identified by inKeyPath. This method may modify or replace the value in order to make it valid.
- `inKeyPath`: The name of one of the receiver’s properties. The key path must specify an attribute or a to-one relationship. The key path has the form relationship``.``property (with one or more relationships); for example department.name or department.manager.lastName.

## Discussion

Discussion In Swift, this method throws an error if the value isn’t valid.  In Objective-C, it returns a Boolean value. The default implementation of this method gets the destination object for each relationship using value(forKey:) and returns the result of calling the validateValue(_:forKey:) method for the property.

## See Also

### Validation

- [validateValue(_:forKey:)](objectivec/nsobject-swift.class/validatevalue(_:forkey:).md)