Problem with stored properties in extensions in project from GitHub - swift

Question

I'm learning how to implement great CollectionViewPagingLayout templates in my project.
This one: https://github.com/amirdew/CollectionViewPagingLayout
First I specify which template to use (now I use "invertedCylinder") - and this part works well:
extension MovieCollectionViewCell: ScaleTransformView {
var scaleOptions: ScaleTransformViewOptions {
.layout(.invertedCylinder)
}
}
The problem appears when I try to modify the template. There is an extension, written by the creator of the Layout:
extension YourCell: ScaleTransformView {
var scaleOptions = ScaleTransformViewOptions(
minScale: 0.6,
scaleRatio: 0.4,
translationRatio: CGPoint(x: 0.66, y: 0.2),
maxTranslationRatio: CGPoint(x: 2, y: 0
)
}
I have tried to get rid of stored properties error and modify the code:
extension MovieCollectionViewCell: ScaleTransformView {
var scaleOptionsDetailed: ScaleTransformViewOptions {
minScale: 0.6,
scaleRatio: 0.4,
translationRatio: CGPoint(x: 0.66, y: 0.2),
maxTranslationRatio: CGPoint(x: 2, y: 0)
}
}
But this gives me more errors:
Redundant conformance of 'MovieCollectionViewCell' to protocol 'ScaleTransformView'
Cannot find 'minScale' in scope
Consecutive statements on a line must be separated by ';'
I understand that this is a question about basics. But it is already the second day im trying to solve the issue and would be very grateful for a guidance.

Answer 1

I don’t know why that repo includes stored properties on an extension. That is illegal and will likely always be illegal.
You could convert your variable scaleOptions to a computed property. To do that get rid of the equals sign. Then every time you reference that property it will run the code in the closure and generate a new value.
It is also possible to fake stored properties for extensions using associated values from the Objective-C runtime, but that is considered a hack and probably not a great idea.