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A multi-step form breaks a long registration or checkout flow into discrete, manageable steps — typically 2 to 5 screens. Each step focuses on a related group of fields, reducing cognitive load and improving completion rates compared to a single long scroll. Common examples include onboarding wizards, address-plus-payment checkout flows, and multi-stage profile setup.

The key to a multi-step form with react-hook-form is to create one useForm instance for the entire form and pass control and errors down as props to each step component. This keeps all field values and validation state in one place. Values entered on step 1 remain available when the user reaches step 3, and submitting the final step accesses the complete form data.

Each step component receives the form instance as a prop. Define a TypeScript type for the prop using UseFormReturn from react-hook-form. This gives the step component access to control, formState.errors, trigger, and watch — all the tools needed to render and validate its own subset of fields.

Before advancing to the next step, validate only the fields on the current step using form.trigger(['fieldA', 'fieldB']). This runs validation on the specified fields and returns a Promise that resolves to true if all are valid. If any fail, the errors appear and the user cannot advance until they are fixed. Fields on later steps are not validated yet.

Add a visual progress bar or step indicator at the top of the screen so users know how far along they are. Calculate progress as (currentStep / totalSteps) * 100. A simple progress bar using an animated View width gives clear feedback and sets expectations about how much more is required before they can complete the form.

Use a step counter in useState to track the current step. 'Next' buttons validate the current step's fields with trigger before incrementing the step. 'Back' buttons decrement the step without re-validating. Always disable the 'Next' button or show a loading spinner while async validation (like username availability checks) is in progress.

The final step is often a review screen where users confirm their entries before submitting. Use form.getValues() to read all field values and display them in a summary list. This gives users one last chance to catch typos before the data is sent to the server, reducing support requests and user errors.

formState.isSubmitting is true while handleSubmit's async callback is running. Use it to disable the submit button and show a loading spinner during the API call. This prevents double-submissions when the user taps quickly and gives clear feedback that the form is being processed.

If users navigate away from the multi-step form and return later, use Zustand or React Navigation's route params to preserve the current step and partially filled form data. Combine this with react-hook-form's reset(savedValues) to restore the form to where the user left off. This dramatically reduces form abandonment on mobile.

On mobile, tapping 'Next' on the keyboard should move focus to the next input within a step. Use useRef to hold refs for each TextInput and call ref.current.focus() in the onSubmitEditing callback of each input. Set returnKeyType='next' on intermediate fields and 'done' on the last field of each step.

When the user presses the hardware back button on Android or swipes back on iOS, handle it to decrement the step counter instead of leaving the screen entirely. Use useFocusEffect with a BackHandler to intercept the hardware back event. If the user is on step 1, allow normal navigation back to the previous screen.

In this lesson you learned: one useForm instance shared across all steps keeps form data and validation state unified, trigger with specific field names validates only the current step before advancing, and formState.isSubmitting disables the submit button during the final API call to prevent duplicate submissions. Next up we explore submitting and resetting forms.