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Massimo Savino edited this page Jun 14, 2017
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The latest Worldwide Developers' Conference at Apple has a link to an hour-long video on 'Essential Design Principles' that does an excellent job of covering these.
Viewing the video requires registration of an Apple Developer account first, but the good news is, these can be had for free; whereas normal paid & registered accounts only charge when you as the developer are ready to distribute your works on the App Store.