SizeClasses
SizeClasses lets you adapt your programmatic layout to size class changes - use the good parts of storyboards while writing code!
Usage
Let's start with a few examples:
// Base layout is the same in every size class
when(.any, .any, activate: [
label.centerYAnchor.constraint(equalTo: view.centerYAnchor)
])
// Use up the whole screen width in compact horizontal sizes
when(.compact, .any, activate: [
label.leadingAnchor.constraint(equalTo: view.readableContentGuide.leadingAnchor),
view.readableContentGuide.trailingAnchor.constraint(equalTo: label.trailingAnchor)
])
// Use only half of the readable content width in regular horizontal sizes
when(.regular, .any, activate: [
label.centerXAnchor.constraint(equalTo: view.readableContentGuide.centerXAnchor),
label.widthAnchor.constraint(equalTo: view.readableContentGuide.widthAnchor, multiplier: 0.5)
])
// Left align label in compact horizontal sizes
when(.compact, .any) {
label.textAlignment = .left
}
// Center align label in regular horizontal sizes
when(.regular, .any) {
label.textAlignment = .center
}Setup
Still interested?
Adopt the protocol SizeClasses in any UITraitEnvironment (UIViewController, UIView, etc) and add the following snippet:
class MyViewController: UIViewController, SizeClasses {
let sizeClassesManager = SizeClassesManager()
override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
super.traitCollectionDidChange(previousTraitCollection)
traitCollectionDidChange()
}
}Using in layout
SizeClasses currently supports NSLayoutConstraints and closures.
Similar to Xcode's storyboards there are three size-class choices available:
public enum UserInterfaceSizeClassPredicate {
case any
case compact
case regular
}The SizeClasses protocol adds several helper functions to its instances:
func when(_ horizontalSizeClass: UserInterfaceSizeClassPredicate, _ verticalSizeClass: UserInterfaceSizeClassPredicate, activate constraints: [NSLayoutConstraint])
func when(_ horizontalSizeClass: UserInterfaceSizeClassPredicate, _ verticalSizeClass: UserInterfaceSizeClassPredicate, do action: @escaping () -> Void) -> Any
func remove(constraint: NSLayoutConstraint)
func remove(actionWith identifier: Any)Review the code's documentation for more details.
Installation
SizeClasses is available through Carthage. To install it, simply add the following line to your Cartfile:
github "Eckelf/SizeClasses"SizeClasses is available through CocoaPods. To install it, simply add the following line to your Podfile:
pod "SizeClasses"Author
Vincent Flecke, [email protected]
License
SizeClasses is available under the MIT license. See the LICENSE file for more info.