# `GSLayer syncBottomMetrics`

*Instance Method*

Applies the bottom side-bearing metrics key.

## Declaration

```swift
func syncBottomMetrics()
```

```objc
- (void) syncBottomMetrics;
```

```python
syncBottomMetrics()
```

## See Also

### Metrics Sync

- [`GSLayer syncMetricsThreshold:`](/Core/GlyphsCore/GSLayer/syncMetricsThreshold:) — Tolerance used when deciding whether metrics need synchronization.
- [`GSLayer syncMetrics`](/Core/GlyphsCore/GSLayer/syncMetrics) — Applies all available metrics keys.
- [`GSLayer syncLeftMetrics`](/Core/GlyphsCore/GSLayer/syncLeftMetrics) — Applies the left side-bearing metrics key.
- [`GSLayer syncWidthMetrics`](/Core/GlyphsCore/GSLayer/syncWidthMetrics) — Applies the advance-width metrics key.
- [`GSLayer syncRightMetrics`](/Core/GlyphsCore/GSLayer/syncRightMetrics) — Applies the right side-bearing metrics key.
- [`GSLayer syncTopMetrics`](/Core/GlyphsCore/GSLayer/syncTopMetrics) — Applies the top side-bearing metrics key.
- [`GSLayer syncVertWidthMetrics`](/Core/GlyphsCore/GSLayer/syncVertWidthMetrics) — Applies the vertical advance-width metrics key.
- [`GSLayer reinterpolateMetrics:`](/Core/GlyphsCore/GSLayer/reinterpolateMetrics:) — Reinterpolates the horizontal metrics of an Alternative layer or interpolated layer.
- [`GSLayer updateMetrics`](/Core/GlyphsCore/GSLayer/updateMetrics) — Recalculates side bearings from the layer contents.