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# invocationWithMethodSignature:

Returns an `NSInvocation` object able to construct messages using a given method signature.

```
+ (NSInvocation *) invocationWithMethodSignature:(NSMethodSignature *) sig;
```

## Parameters

`sig`

An object encapsulating a method signature.

## Discussion

The new object must have its selector set with [`NSInvocation`](/documentation/Foundation/NSInvocation) and its arguments set with [`setArgument:atIndex:`](/documentation/Foundation/NSInvocation/setArgument:atIndex:) before it can be invoked. Do not use the <doc://com.apple.documentation/documentation/ObjectiveC/NSObject-swift.class/alloc>/<doc://com.apple.documentation/documentation/ObjectiveC/NSObject-swift.class/init()> approach to create `NSInvocation` objects.

## See Also

  [Distributed Objects Programming Topics](https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/DistrObjects/DistrObjects.html#//apple_ref/doc/uid/10000102i)


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