- iOS 12 compatible
- Maximum readability
- No new concepts or magic
import Pin adds new properties to Layoutable elements such as views and layout guides.
Define a constraint using operators like so:
let constraint = label.bottomPin == view.bottomPin // NSLayoutConstraintlet widthConstraint = label.widthPin <= view.widthPin * 0.75 ~ UILayoutPriorityDefaultHigh
let topConstraint = label.topPin == imageView.bottomPin + 10Pin a views center. offset and multiplier is optional.
titleLabel.pinCenter(to: view) // [NSLayoutConstraint]Pin a views edges to another view. insets is optional.
backgroundView.pinEdges(to: view) // [NSLayoutConstraint]Pin a views edges to another views edge margins
longTextLabel.pinEdgeMargins(to: textContainer) // [NSLayoutConstraint]Sequence of NSLayoutConstraint is extended when importing Pin with two methods.
let constraints = [
label.centerXPin == view.centerXPin,
label.width <= 250,
label.topPin == view.topLayoutGuide.bottomPin
]
constraints.activate() // Activates constraints
constraints.deactivate() // Deactivates constraintsYou can create multiple constraints without storing them, for instance, in viewDidLoad:
override func viewDidLoad() {
super.viewDidLoad()
var constraints = [NSLayoutConstraint]()
constraints += backgroundView.pinEdges(to: view)
constraints += [
titleLabel.topPin == topLayoutGuide.bottomPin + 30,
titleLabel.centerXPin == view.centerXPin,
titleLabel.widthPin <= view.widthPin * 0.75,
textContainer.bottomPin == bottomLayoutGuide.topPin - 30,
textContainer.leftPin == view.leftMarginPin,
textContainer.rightPin == view.rightMarginPin
]
constraints += longTextLabel.pinEdgeMargins(to: textContainer)
constraints.activate()
}You can also use NSLayoutConstraint.make for an even cleaner implementation:
NSLayoutConstraint.make { constraints in
constraints += backgroundView.pinEdges(to: view)
constraints.append(textLabel.width == 200)
}.activate()If you don't fancy operators, you can use the more expressive syntax, or mix as you like:
NSLayoutConstraint.activate([
label.topPin.equal(to: view.topMarginPin),
label.centerXPin.equal(to: view.centerXPin),
label.leftPin.greaterThanOrEqual(to: view.leftPin * 0.25) ~ UILayoutPriorityDefaultHigh,
label.rightPin.lessThanOrEqual(to: view.rightPin.multiplied(by: 0.75).offset(by: 10)).prioritized(at: UILayoutPriorityDefaultHigh)
])- David Ask (@davidask)
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