An extension that gives UIImageView the ability to focus on faces through Vision Framework within an image

by iOS Example

VisionFaceAware

Foreword

This package is based on https://github.com/BeauNouvelle/FaceAware which isn’t maintained anymore. Now it uses Apple’s Vision Framework instead of Core Image, based on a comparison result it performs much faster and looking at the trend with ML it will be better with each new cpu iteration.

Use case

Sometimes the aspect ratios of images we need to work with don’t quite fit within the confines of our UIImageViews.

In most cases we can use AspectFill to fit the image to the bounds of a UIImageView without stretching or leaving whitespace, however when it comes to photos of people, it’s quite often to have the faces cropped out if they’re not perfectly centered.

This is where VisionFaceAware comes in. It will analyze an image either through UIImageView‘s image property, or one you set using one of the built in functions and focus in on any faces it can find within.

The most common use is with avatars.

With this library users will no longer have to crop and adjust their profile pictures.

Installation

Swift Package Manager

  • In Xcode, click File -> Add Packages...
  • Insert https://github.com/gentique/VisionFaceAware in the search field.
  • Select Dependency Rule “Up to Next Major Version” with “1.0.0”

Usage

There are a few ways to get your image views focussing in on faces within images.

Interface Builder

This is the easiest method and doesn’t require writing any code. The extension makes use of @IBDesignable and @IBInspectable so you can turn on focusOnFaces from within IB. However you won’t actually see the extension working until you run your project.

Code

You can set focusOnFaces to true.

someImageView.focusOnFaces = true

Be sure to set this after setting your image. If no image is present when this is called, there will be no faces to focus on.

Debugging

It features a debug mode which draws red squares around any detected faces within an image. To enable you can set the debug property to true.

someImageView.debug = true

You can also set this flag within interface builder.

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

GitHub

View Github