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Generic structures to host previews of UIView and UIViewController subclasses.
import UIKit
#if canImport(SwiftUI) && DEBUG
import SwiftUI
struct UIViewControllerPreview<ViewController: UIViewController>: UIViewControllerRepresentable {
let viewController: ViewController
init(_ builder: @escaping () -> ViewController) {
viewController = builder()
}
// MARK: - UIViewControllerRepresentable
func makeUIViewController(context: Context) -> ViewController {
viewController
}
func updateUIViewController(_ uiViewController: ViewController, context: UIViewControllerRepresentableContext<UIViewControllerPreview<ViewController>>) {
return
}
}
#endif
import UIKit
#if canImport(SwiftUI) && DEBUG
import SwiftUI
struct UIViewPreview<View: UIView>: UIViewRepresentable {
let view: View
init(_ builder: @escaping () -> View) {
view = builder()
}
// MARK: - UIViewRepresentable
func makeUIView(context: Context) -> UIView {
return view
}
func updateUIView(_ view: UIView, context: Context) {
view.setContentHuggingPriority(.defaultHigh, for: .horizontal)
view.setContentHuggingPriority(.defaultHigh, for: .vertical)
}
}
#endif
@mattt

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mattt commented Oct 14, 2019

This is free and unencumbered software released into the public domain.

Anyone is free to copy, modify, publish, use, compile, sell, or
distribute this software, either in source code form or as a compiled
binary, for any purpose, commercial or non-commercial, and by any
means.

In jurisdictions that recognize copyright laws, the author or authors
of this software dedicate any and all copyright interest in the
software to the public domain. We make this dedication for the benefit
of the public at large and to the detriment of our heirs and
successors. We intend this dedication to be an overt act of
relinquishment in perpetuity of all present and future rights to this
software under copyright law.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

For more information, please refer to https://unlicense.org

@lionhylra

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lionhylra commented Oct 16, 2019

Is there any reason why UIViewControllerPreview and UIViewPreview takes generics? It looks it's fine to just use UIView and UIViewController for property type and closure return type.
And it seems @escaping is not necessary.

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