Add square constraints method (#338)

Sources/Layout/UIKit/UIView+AutoLayout.swift

@@ -126,6 +126,16 @@ extension UIView {
 
     // MARK: - Square
 
+    /// Creates constraints defining the width and height of the receiver to be the given length.
+    ///
+    /// - Returns: The created constraints.
+    public func squareConstraints(_ length: CGFloat) -> [NSLayoutConstraint] {
+        [
+            widthConstraint(length),
+            heightConstraint(length)
+        ]
+    }
+
     /// Creates a constraint defining the aspect ratio of the receiver to be square.
     ///
     /// - Returns: The created constraint.

Tests/LayoutTests/UIKit/UIView+AutoLayoutTests.swift

@@ -433,6 +433,35 @@ final class UIViewAutoLayoutTests: XCTestCase {
 
     // MARK: - Square
 
+    func testSquareConstraintsWithLength() {
+
+        // GIVEN
+
+        let view: UIView = .init()
+
+        // WHEN
+
+        let squareConstraints: [NSLayoutConstraint] = view.squareConstraints(100)
+
+        // THEN
+
+        expect(squareConstraints.count) == 2
+        expect(squareConstraints[0]).to(match(NSLayoutConstraint(item: view,
+                                                                 attribute: .width,
+                                                                 relatedBy: .equal,
+                                                                 toItem: nil,
+                                                                 attribute: .notAnAttribute,
+                                                                 multiplier: 1,
+                                                                 constant: 100)))
+        expect(squareConstraints[1]).to(match(NSLayoutConstraint(item: view,
+                                                                 attribute: .height,
+                                                                 relatedBy: .equal,
+                                                                 toItem: nil,
+                                                                 attribute: .notAnAttribute,
+                                                                 multiplier: 1,
+                                                                 constant: 100)))
+    }
+
     func testSquareConstraint() {
 
         // GIVEN

cheatsheet.html

@@ -285,6 +285,8 @@ <h3>Height</h3>
                         <pre>heightConstraint()</pre>
                         <pre>heightConstraint(100)</pre>
                         <h3>Square</h3>
+                        <pre>// Size //</pre>
+                        <pre>squareConstraints(100)</pre>
                         <pre>// Aspect Ratio //</pre>
                         <pre>squareConstraint()</pre>
                         <h3>Aspect Ratio</h3>