Persistence choices depend on data structure and sensitivity. UserDefaults suits small preferences; structured application data needs a suitable persistence model and migration plan.
Before you begin
Use a supported development setup and a small sample app. Record the toolchain, target and test device or simulator.
Work through the idea
Define a user task and the states the interface must represent. Test normal, empty and failed states as applicable, and consider larger text, narrow layouts and interrupted operations. Keep sample data fictional. Distinguish simulator checks from features that require validation on the intended physical device.
- Separate settings from records
- Define identifiers and update rules
- Consider sensitive-data handling
Practice task
Plan storage for a fictional theme preference and a collection of tasks.
Check your result
Explain why the two kinds of data may use different mechanisms and how deletion works.
A mistake to avoid
Do not store passwords or other secrets in ordinary preferences.
Keep a review note
Save the inputs or scenario, your reasoning and the result you checked. Explain one assumption and one case that needs more work. Revise the exercise after feedback and distinguish what you demonstrated from what remains untested.
Official reference for further study
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