# `GSLayer.topMetricsKeyUI`

*Instance Property*

Display and editing string for the top metrics key.

## Declaration

```swift
unowned(unsafe) var topMetricsKeyUI: NSString? { get set }
```

```objc
@property (nonatomic, unsafe_unretained) NSString * topMetricsKeyUI;
```

```python
topMetricsKeyUI() -> str
setTopMetricsKeyUI_(topMetricsKeyUI: str)
```

## See Also

### Vertical Metrics Keys UI

- [`GSLayer topMetricsKeyState`](/Core/GlyphsCore/GSLayer/topMetricsKeyState) — State flags for the top metrics key.
- [`GSLayer topMetricsKeyState:`](/Core/GlyphsCore/GSLayer/topMetricsKeyState:) — Display string for the top metrics key and its state.
- [`GSLayer topPlainMetricsKey`](/Core/GlyphsCore/GSLayer/topPlainMetricsKey) — Plain effective metrics key for the top side bearing.
- [`GSLayer.bottomMetricsKeyUI`](/Core/GlyphsCore/GSLayer/bottomMetricsKeyUI) — Display and editing string for the bottom metrics key.
- [`GSLayer bottomMetricsKeyState`](/Core/GlyphsCore/GSLayer/bottomMetricsKeyState) — State flags for the bottom metrics key.
- [`GSLayer bottomMetricsKeyState:`](/Core/GlyphsCore/GSLayer/bottomMetricsKeyState:) — Display string for the bottom metrics key and its state.
- [`GSLayer bottomPlainMetricsKey`](/Core/GlyphsCore/GSLayer/bottomPlainMetricsKey) — Plain effective metrics key for the bottom side bearing.
- [`GSLayer vertWidthUI`](/Core/GlyphsCore/GSLayer/vertWidthUI) — Vertical advance width for display.
- [`GSLayer.vertWidthMetricsKeyUI`](/Core/GlyphsCore/GSLayer/vertWidthMetricsKeyUI) — Display and editing string for the vertical width metrics key.
- [`GSLayer vertWidthMetricsKeyState`](/Core/GlyphsCore/GSLayer/vertWidthMetricsKeyState) — State flags for the vertical width metrics key.
- [`GSLayer vertWidthMetricsKeyState:defaultKey:`](/Core/GlyphsCore/GSLayer/vertWidthMetricsKeyState:defaultKey:) — Display string for the vertical width metrics key and its state.
- [`GSLayer vertWidthPlainMetricsKey`](/Core/GlyphsCore/GSLayer/vertWidthPlainMetricsKey) — Plain effective metrics key for the vertical advance width.
- [`GSLayer.vertOriginMetricsKeyUI`](/Core/GlyphsCore/GSLayer/vertOriginMetricsKeyUI) — Display and editing string for the vertical origin metrics key.
- [`GSLayer vertOriginMetricsKeyState`](/Core/GlyphsCore/GSLayer/vertOriginMetricsKeyState) — State flags for the vertical origin metrics key.
- [`GSLayer vertOriginMetricsKeyState:`](/Core/GlyphsCore/GSLayer/vertOriginMetricsKeyState:) — Display string for the vertical origin metrics key and its state.