Three things I learned from Apple’s human interface guidelines:
1. Always be prepared to stop– when we design we don’t always take this state/flow into account. Having Apple set guidelines and action steps to what to do in this case is super helpful.
2. Text that responds appropriately to changes the user makes to text-size settings– this is something that is important to take in account and test seeing how a different text setting effects the designs and make appropriate design/layout decisions for these cases.
3. Make sure your UI can handle the double-high status bar- this is definitely not something I would have thought of and super important to pay attention to cases where important UI elements may be covered.
Good call about #3. This is something that people very often forget and completely happens when you’ve got a phone call going and are using an app, for example.