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# CTFrameProgression

Constants that specify frame progression types.

```
enum CTFrameProgression
```

## Overview

The lines of text within a frame may stack for either horizontal or vertical text. Values are enumerated for each stacking type supported by [`CTFrameProgression`](/documentation/CoreText/CTFrameProgression). Frames with a progression type that specifies vertical text rotate lines 90 degrees counterclockwise during drawing.

## Topics

### Constants

[`CTFrameProgression.topToBottom`](/documentation/CoreText/CTFrameProgression/topToBottom)

Lines stack top to bottom for horizontal text.

[`CTFrameProgression.rightToLeft`](/documentation/CoreText/CTFrameProgression/rightToLeft)

Lines stack right to left for vertical text.

[`CTFrameProgression.leftToRight`](/documentation/CoreText/CTFrameProgression/leftToRight)

Lines stack left to right for vertical text.


---

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