# `GSFontMaster replaceObjectInCustomParametersAtIndex:withObject:`

*Instance Method*

## Declaration

```swift
func replaceObjectInCustomParameters(at idx: UInt, withObject customParameter: GSCustomParameter)
```

```objc
- (void) replaceObjectInCustomParametersAtIndex:(NSUInteger) idx withObject:(GSCustomParameter *) customParameter;
```

```python
replaceObjectInCustomParametersAtIndex_withObject_(idx: int, customParameter: GSCustomParameter)
```