# `GSLayer setTempData:forKey:`

*Instance Method*

Sets or removes a temporary value.

## Declaration

```swift
func setTempData(_ value: Any?, forKey key: String)
```

```objc
- (void) setTempData:(id) value forKey:(NSString *) key;
```

```python
setTempData_forKey_(value: object, key: str)
```

## Parameters

- `value` — The value to set, or `nil` to remove the temporary value.

## Discussion

Passing `nil` as the value removes the temporary value.

## See Also

### Temporary Data

- [`GSLayer.tempData`](/Core/GlyphsCore/GSLayer/tempData) — Values associated with the layer for transient use.
- [`GSLayer tempDataForKey:`](/Core/GlyphsCore/GSLayer/tempDataForKey:) — The temporary value for a key, or `nil` if no value is set.