Photo Select and Crop

This Swift Package integrates a UIImagePickerController into a SwiftUI app and allows a user to select, scale and position an image to be cropped and saved as a conatct's photo, similar to the stock iOS Contacts app. To accomplish this, the project uses a composeImageAttributes() function to send four variables via bindings to the parent view:

1. a copy of the original UIImage,
2. a scaled and / or cropped UIImage version of it,
3. a CGFloat, and
4. a CGPoint.

The CGFloat and CGPoint represent the scale and position of the original image used to make the processed version.

:point_up: By saving the original image and scale and position markers and passing them to the ImageMoveAndScaleSheet view, if the user taps the "Change photo" button, the original photo is scaled and positioned to allow subsequent adjustments.

Implementation

Add an ImagePane view to your parent view like this:

ImagePane(image: image, isEditMode: $isEditMode, renderingMode: renderingMode, colors: colors)

Using CoreData, one might do the following. Define two entities: Contact and ProfileImage, where Contact has a To One relationship to ProfileImage. The ProfileImage entity should have properties that can be mapped to the variables provided to the ImageDisplay struct after the user has selected an image from their library.

Then, an ImageAttributes class should be initialized with the properties from the Core Data entity. This ImageAttributes class is then passed to the ImagePane as in the above code. For the nil case, a second ImageAttributes struct is initialzed, this time with a default image named avatar which was saved to the project's Image Assets folder.

An ImageAttributes object can easily be defined as a placeholder.

With an SF Symbol: let placeholderAperture = ImageAttributes(withSFSymbol: "camera.aperture")

With an image from the Assets folder: let placeholderAvatar = ImageAttributes(withImage: "avatar")

Examples of working apps using this Package can be found at: https://github.com/Rillieux/Contacts (using CoreData), and https://github.com/Rillieux/PhotoSelectAndCropDemo (a basic working implementation which does not cover persistence).