Apple HIG: Status Components

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Key Principles

Progress Indicators

1. Show progress for operations longer than a second or two.

2. Determinate when duration/percentage is known. A filling progress bar gives users a clear sense of remaining work. Use for downloads, uploads, or any measurable process.

3. Indeterminate when duration is unknown. A spinner communicates work is happening without promising a timeframe. Use for unpredictable network requests.

4. Prefer progress bars over spinners. Determinate progress feels faster and more trustworthy.

5. Place indicators where content will appear. Inline progress near the content area, not modal or distant.

6. Don't stack multiple indicators. Aggregate simultaneous operations into one representation or show the most relevant.