> For the complete documentation index, see [llms.txt](https://jacky-chen.gitbook.io/jackychen/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jacky-chen.gitbook.io/jackychen/dai-fen-lei/swiftui.md).

# SwiftUI

* Use struct instead of class
* A View Defines a Piece of UI
* A View Defines its Dependencies
  * State property
    * SwiftUI can observe when they are read and written
* Where is truth?