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iMoeNya edited this page Jun 18, 2021
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Delayout allows you to write you UI structure code together with the layout code:
let someView = SomeView()
let label = Label()
view { // view builder provided by Delayout
someView
.fillHorizontally()
.topInset(by: 20)
label
.top(to: .bottom, of: someView, by: 8) // constraint to sibling
.centerHorizontally()
.bottomInset(by: -20)
}
Even though you might already had the UIKit system DSLified, you still have to write your UI structure code and layout code separately:
let someView = SomeView()
let label = UILabel()
view.subviews {
someView
label
}
// ......
someView.Top == view.Top
label.Top == someView.Bottom
If you try adding constraints between the view and its superview inside the subviews { /* ... */ }
block, which I bet you had tried, it won't work. Because inside the block, the view has not yet been added to the superview then:
view.subviews {
someView
.fillHorizontally(padding: 20) // won't work
}
Let alone setting up constraints between siblings, which leads to a runtime crash:
view.subviews {
someView
label
.make { /* top to someView */ }
}
Delayout makes it work, in 2 steps:
- Delay
- Layout
I attached an example project in the repo. A glance:
final class View: UIView {
override init(frame: CGRect) {
super.init(frame: frame)
let cardView = UIView()
self {
cardView {
HStack {
UIImageView(image: UIImage(named: "Avatar"))
.cornerRadius(avatarDimension / 2)
.dimension(avatarDimension)
.clipsToBounds(true)
.contentMode(.scaleAspectFill)
VStack {
UILabel()
.text("Chrysanthemum")
.font(.preferredFont(forTextStyle: .headline))
UILabel()
.text("Also called mums or chrysanths.")
.font(.preferredFont(forTextStyle: .callout))
}
.spacing(4)
}
.spacing(12)
.alignment(.center)
.leadingInset(by: 20)
.trailingInset(lessThan: -20)
.fillVertically(padding: 20)
}
.topInset(from: .safeArea, by: 16)
.cornerRadius(12)
.backgroundColor(.secondarySystemBackground)
.fillHorizontally(padding: 20)
UIView()
.backgroundColor(.black.withAlphaComponent(0.2))
.alpha(0)
.fillHorizontally()
.fillVertically()
.onTap(target: self, #selector(obscuringViewTapped))
.store(as: &obscuringView)
DetailView()
.topInset(from: .safeArea, greaterThan: 0)
.fillHorizontally()
.top(
to: .bottom,
of: self,
by: 0,
priority: .defaultHigh,
identifiedBy: detailViewTopConstraintID
)
.store(as: &detailView)
}
.backgroundColor(.systemBackground)
.onTap(target: self, #selector(tapped))
}
}
And the result:
Simulator.Screen.Recording.-.iPhone.12.Pro.Max.-.2021-06-13.at.22.14.09.mp4
The animation is done by updating the constant of a constraint added by Delayout, explain in this page.