# `GSCallbackHandler addCustomParameterViewClass:forParameter:`

*Type Method*

add class of view controller that handles UI for parameterName

## Declaration

```swift
class func addCustomParameterViewClass(_ parameterClass: AnyClass, forParameter parameterName: String)
```

```objc
+ (void) addCustomParameterViewClass:(Class) parameterClass forParameter:(NSString *) parameterName;
```

```python
addCustomParameterViewClass_forParameter_(parameterClass: type, parameterName: str)
```