13. Prototyping: Wiring Logic
Bringing Static Pixels to Life
A collection of static screens is just a gallery. A Prototype is a simulation of the final product. Professional UI Engineers use prototypes to test the user flow, validate interaction logic, and get stakeholder sign-off long before a single line of production React or Swift is written.
🔗 The Anatomy of a Prototype
Prototyping in tools like Figma relies on a simple 'If This, Then That' logical structure. Every interaction consists of three parts:
- 1. Trigger: What does the user do? (e.g., On Click, On Drag, While Hovering).
- 2. Action: What does the system do in response? (e.g., Navigate To, Open Overlay, Scroll To).
- 3. Destination: Where does the user end up? (e.g., The Dashboard Frame).
✨ Transitions vs. Smart Animate
Once you define the Action, you must define how the system gets there visually.
- Standard Transitions: Push, Slide In, Dissolve. These are basic animations moving the user from Screen A to Screen B.
- Smart Animate: The modern standard. If Screen A and Screen B share elements with the exact same layer name, the engine automatically interpolates the size, position, and color changes, creating a seamless, app-like transition.
🧪 Validating the Flow
The primary engineering goal of a prototype is Validation. If you hand off a design to developers and they have to guess what happens when 'Cancel' is clicked, your prototype has failed. A professional prototype wires every button, ensuring there are zero dead ends.
In the Sandbox, you will enter 'Prototype Mode'. You will see a Login screen and a Dashboard screen. Your mission is to establish the logical connection between them. You must click the 'Login' button to trigger the interaction, and draw the 'Prototype Noodle' (the physical wire) over to the Dashboard frame. Once connected, test the prototype to ensure the logical loop is complete.
Tip: Click the Login button to simulate dragging a 'Prototype Noodle' to the Dashboard.
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