relikd/Textual-Auto-Layout
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iOS11+: anchor.systemSpacing(_,multiplier:)

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relikd
2020-07-04 00:51:20 +02:00
parent 40a52d6966
commit d96994e4e9
3 changed files with 36 additions and 1 deletions
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2
README.md
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@@ -6,7 +6,7 @@
Textual Auto Layout (TAL) helps you create Auto Layout constraints that you can read, understand, and maintain.
In contrast to existing libraries ([SnapKit](https://github.com/SnapKit/SnapKit), [Cartography](https://github.com/robb/Cartography)), TAL follows a minimization approach. The package consists of a single ~120 lines source file, thus TAL won't have every imaginable feature. Instead you get a dependency ideal for security audits: short and tidy.
In contrast to existing libraries ([SnapKit](https://github.com/SnapKit/SnapKit), [Cartography](https://github.com/robb/Cartography)), TAL follows a minimization approach. The package consists of a single ~150 lines source file, thus TAL won't have every imaginable feature. Instead you get a dependency ideal for security audits: short and tidy.
To install, use Swift Package Manager or simply copy the source file to your project and you're good to go.

24
Sources/TextualAutoLayout/TextualAutoLayout.swift
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@@ -122,3 +122,27 @@ public extension Array where Element: NSLayoutConstraint {
return self
}
}
// I couldn't find a better way to handle it, but these methods are particularly useful.
// Sadly, the syntax isn't quite as readable as the stuff above.
#if !os(macOS)
@available(iOS 11, tvOS 11, *)
public extension NSLayoutXAxisAnchor {
/// Calls and activates `.constraint(equalToSystemSpacingAfter: a)`
@discardableResult func systemSpacing(_ equal: NSLayoutXAxisAnchor, multiplier m: CGFloat = 1.0) -> NSLayoutConstraint { constraint(equalToSystemSpacingAfter: equal, multiplier: m).on() }
/// Calls and activates `.constraint(lessThanOrEqualToSystemSpacingAfter: a)`
@discardableResult func systemSpacing(lessThan a: NSLayoutXAxisAnchor, multiplier m: CGFloat = 1.0) -> NSLayoutConstraint { constraint(lessThanOrEqualToSystemSpacingAfter: a, multiplier: m).on() }
/// Calls and activates `.constraint(greaterThanOrEqualToSystemSpacingAfter: a)`
@discardableResult func systemSpacing(greaterThan a: NSLayoutXAxisAnchor, multiplier m: CGFloat = 1.0) -> NSLayoutConstraint { constraint(greaterThanOrEqualToSystemSpacingAfter: a, multiplier: m).on() }
}
@available(iOS 11, tvOS 11, *)
public extension NSLayoutYAxisAnchor {
/// Calls and activates `.constraint(equalToSystemSpacingBelow: a)`
@discardableResult func systemSpacing(_ equal: NSLayoutYAxisAnchor, multiplier m: CGFloat = 1.0) -> NSLayoutConstraint { constraint(equalToSystemSpacingBelow: equal, multiplier: m).on() }
/// Calls and activates `.constraint(lessThanOrEqualToSystemSpacingBelow: a)`
@discardableResult func systemSpacing(lessThan a: NSLayoutYAxisAnchor, multiplier m: CGFloat = 1.0) -> NSLayoutConstraint { constraint(lessThanOrEqualToSystemSpacingBelow: a, multiplier: m).on() }
/// Calls and activates `.constraint(greaterThanOrEqualToSystemSpacingBelow: a)`
@discardableResult func systemSpacing(greaterThan a: NSLayoutYAxisAnchor, multiplier m: CGFloat = 1.0) -> NSLayoutConstraint { constraint(greaterThanOrEqualToSystemSpacingBelow: a, multiplier: m).on() }
}
#endif

11
Tests/TextualAutoLayoutTests/TextualAutoLayoutTests.swift
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@@ -73,4 +73,15 @@ final class TextualAutoLayoutTests: XCTestCase {
x.setActive(false)
for u in x { XCTAssertEqual(u.isActive, false) }
}
#if !os(macOS)
@available(iOS 11, tvOS 11, *)
func testSystemSpacing() {
let x = B.topAnchor.systemSpacing(A.bottomAnchor, multiplier: 2) | .defaultLow
XCTAssertEqual(x.relation, NSLayoutConstraint.Relation.equal)
XCTAssertEqual(x.priority, ConstraintPriority.defaultLow)
XCTAssertEqual(x.constant, 16)
XCTAssertEqual(x.multiplier, 1)
}
#endif
}