# `GSFontMaster localizedCustomValueForKey:layer:`

*Instance Method*

## Declaration

```swift
func localizedCustomValue(forKey key: String, layer: GSLayer) -> CGFloat
```

```objc
- (CGFloat) localizedCustomValueForKey:(NSString *) key layer:(GSLayer *) layer;
```

```python
localizedCustomValueForKey_layer_(key: str, layer: GSLayer) -> float
```