# `GSInstance customParameterActiveForKey:`

*Instance Method*

Returns the active custom parameter object for the specified key.

## Declaration

```swift
func customParameterActive(forKey key: String) -> GSCustomParameter?
```

```objc
- (GSCustomParameter *) customParameterActiveForKey:(NSString *) key;
```

```python
customParameterActiveForKey_(key: str) -> GSCustomParameter
```