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# forwardInvocation(_:)

Passes a given invocation to the real object the proxy represents.

```
func forwardInvocation(_ invocation: NSInvocation)
```

## Parameters

`invocation`

The invocation to forward.

## Discussion

`NSProxy`’s implementation merely raises `NSInvalidArgumentException`. Override this method in your subclass to handle `invocation` appropriately, at the very least by setting its return value.

For example, if your proxy merely forwards messages to an instance variable named `realObject`, it can implement [`forwardInvocation(_:)`](/documentation/Foundation/NSProxy/forwardInvocation(_:)) like this:

```objc
- (void)forwardInvocation:(NSInvocation *)anInvocation
{
    [anInvocation setTarget:realObject];
    [anInvocation invoke];
    return;
}
```

---

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