Pull to refresh, this friend of ours
The Pull to refresh became one of the most popular concepts used in mobile iOS apps. Loren Brichter, the author of Tweetie for iOS introduced it for the first time in 2011 and it stood the test of time. Several implementations of the pull to refresh lie out there and the most used on iOS is for sure the SVPullToRefresh by Sam Vermette. Back in 2012, the concepts of Objective-C runtime and associated objects were still obscure to most of the iOS developers but Sam used the properly to add an extra view to the UIScrollView without the need for subclassing.
Apple built a native pull to refresh publicly available as of iOS 6, called UIRefreshControl, but customizations are hard to achieve and still, too often developers fallback to an ad hoc implementations. The most common customization is implementing a circular progress view like the one used in the Pinterest app. This leads to a much cooler UI rather than the well-known yet obsolete rotating arrow, and it is recognizable and intuitive to all iOS users.
The concept proposed here has two main individual transitions that are dependent about the position of the finger:
- App logo becomes visible (alpha/opacity property)
- Circle progress becomes filled
You can see the final behaviour in the gif below, but I definitely recommend downloading and running the Beamly iOS app by yourself to get the right feeling.
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