# `GSCallbackHandler registerFontChecker:`

*Type Method*

## Declaration

```swift
class func registerFontChecker(_ checker: any GSFontCheckerProtocol)
```

```objc
+ (void) registerFontChecker:(NSObject<GSFontCheckerProtocol> *) checker;
```

```python
registerFontChecker_(checker: NSObject<GSFontCheckerProtocol>)
```