AceLayout provides a Swifty DSL for Auto Layout.
- iOS 11.0+ / macOS 10.13+ / tvOS 11.0+
- Xcode 14.3+
- Swift 5.8+
- Strongly typed.
- The compiler does not accept wrong constraints such as
some.top == another.leading.
- The compiler does not accept wrong constraints such as
- Simple, modern and unmistakable APIs.
- No need to write boilerplates.
view.translatesAutoresizingMaskIntoConstraints = falseconstraint.isActive = true
Call the autoLayout method of your UIView, UILayoutGuide, NSView or NSLayoutGuide with a closure that describes Auto Layout constraints.
view.autoLayout { item in
item.top.equal(to: anotherView, plus: 16) // to UIView
item.bottom.equalToSuperview() // to superview
item.leading.equal(to: layoutMarginsGuide) // to UILayoutGuide
item.trailing.equal(to: anotherView.centerXAnchor) // to NSLayoutAnchor
item.width.equal(to: 100) // to constant
item.height.equal(to: item.width) // to LayoutAnchor
}In the example, the followings are done automatically:
-
Set
view.translatesAutoresizingMaskIntoConstraintstofalse. -
Activates all constraints.
view.autoLayout { item in
item.top.greaterThanOrEqual(to: safeAreaLayoutGuide)
item.bottom.lessThanOrEqualToSuperview()
}UILayoutPriority and NSLayoutConstraint.Priority are available.
view.autoLayout { item in
item.center.equalToSuperview().priority(.required)
item.size.equal(toSquare: 100).priority(.defaultHigh)
}You can specify an argument activates to determine whether to immediately activate constraints.
let constraints = view.autoLayout(activates: false) { item in
item.edges.equal(to: anotherView)
}
// All constraints are not active.
assert(constraints.allSatisfy { !$0.isActive })
// You can activate them at any time.
NSLayoutConstraint.activate(constraints)view.autoLayout { item in
item.center.equal(to: anotherView)
item.topLeading.equalToSuperview()
}view.autoLayout { item in
item.size.equal(to: CGSize(width: 100, height: 200))
}view.autoLayout { item in
item.leadingTrailing.equal(to: anotherView)
item.topBottom.equalToSuperview(insetBy: 16)
}view.autoLayout { item in
item.edges.equalToSuperview(insetBy: 16)
}leadingtrailingleftrightcenterX
topbottomcenterY
firstBaselinelastBaseline
widthheight
centertopLeadingtopTrailingtopLefttopRightbottomLeadingbottomTrailingbottomLeftbottomRight
size
leadingTrailingleftRight
topBottom
edges
To use the AceLayout library in a SwiftPM project, add the following line to the dependencies in your Package.swift file:
.package(url: "https://github.com/jrsaruo/AceLayout", from: "1.1.2"),and add AceLayout as a dependency for your target:
.target(name: "<target>", dependencies: [
.product(name: "AceLayout", package: "AceLayout"),
// other dependencies
]),Finally, add import AceLayout in your source code.