https://github.com/frankdilo/fdrotationgesturerecognizer

A gesture recognizer for rotations
https://github.com/frankdilo/fdrotationgesturerecognizer

Last synced: about 1 year ago
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A gesture recognizer for rotations

• Host: GitHub
• URL: https://github.com/frankdilo/fdrotationgesturerecognizer
• Owner: frankdilo
• License: mit
• Archived: true
• Created: 2015-06-21T20:04:41.000Z (almost 11 years ago)
• Default Branch: master
• Last Pushed: 2015-07-20T18:42:17.000Z (almost 11 years ago)
• Last Synced: 2025-03-03T23:51:25.033Z (over 1 year ago)
• Language: Objective-C
• Size: 2.71 MB
• Stars: 22
• Watchers: 2
• Forks: 1
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# FDRotationGestureRecognizer

A `UIGestureRecognizer` subclass that, once added to a view, allows to easily measure the rotation performed by the user dragging on the screen.

## Demo

This is just a little demo built around the gesture recognizer:

![](https://github.com/frankdilo/FDRotationGestureRecognizer/raw/master/Other/demo.gif)

(Video available [here](https://github.com/frankdilo/FDRotationGestureRecognizer/raw/master/Other/demo.mov) if you don't like gifs.)

## How it works

Basically when the user starts the gesture, the initial tap coordinates are recorded and, as the gesture continues, the angle is updated as explained in this image.

![](https://github.com/frankdilo/FDRotationGestureRecognizer/raw/master/Other/explanation.png)

## Credits

I created this component while building the [MyFertility app](https://itunes.apple.com/it/app/my-fertility/id862972591?mt=8) to implement the circular day picker. Thanks to [@dzamir](https://twitter.com/dzamir) and Return Service for letting me open source it :)

![](https://github.com/frankdilo/FDRotationGestureRecognizer/raw/master/Other/myfert.jpeg)