I wrote a library for working with Auto Layout in Swift. It lets you tweak Auto Layout constraints and watch your app update immediately without a rebuild + run cycle. It’s called Zhi.

The library allows you to specify your auto layout constraints in separate .styles files. It supports:

• Live reloading of Auto Layout constraints as you save the .styles files, without a rebuild + run cycle
• Apple's Visual Format Language: H:[p(==v2)]|
• Support an equations-based syntax: v1.width = v2.width + 10

In addition, the .styles files also support:

• Metrics can be specified
• Colors — rgb(), rgba() or named colors in UIColor, e.g. red
• Image filenames
• Button title and label text
• Font name, size
• Dynamic type style names, e.g. callout or caption1
• and more

This means that you can tweak these properties without rebuilding your app during development.

Refer to the README for installation and usage.

Try it out and let me know what you think.

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