Add autolayout builder

2 files changed, 235 insertions, 0 deletions

diff --git a/ios/MullvadVPN.xcodeproj/project.pbxproj b/ios/MullvadVPN.xcodeproj/project.pbxproj
index 33dc34a1b4..b202225aae 100644
--- a/ios/MullvadVPN.xcodeproj/project.pbxproj
+++ b/ios/MullvadVPN.xcodeproj/project.pbxproj
@@ -151,6 +151,7 @@
 		5878A279290954790096FC88 /* TunnelViewControllerInteractor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5878A278290954790096FC88 /* TunnelViewControllerInteractor.swift */; };
 		5878A27B2909649A0096FC88 /* CustomOverlayRenderer.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5878A27A2909649A0096FC88 /* CustomOverlayRenderer.swift */; };
 		5878A27D2909657C0096FC88 /* RevokedDeviceInteractor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5878A27C2909657C0096FC88 /* RevokedDeviceInteractor.swift */; };
+		5878F50029CDA742003D4BE2 /* UIView+AutoLayoutBuilder.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5878F4FF29CDA742003D4BE2 /* UIView+AutoLayoutBuilder.swift */; };
 		587988C728A2A01F00E3DF54 /* AccountDataThrottling.swift in Sources */ = {isa = PBXBuildFile; fileRef = 587988C628A2A01F00E3DF54 /* AccountDataThrottling.swift */; };
 		587A01FC23F1F0BE00B68763 /* SimulatorTunnelProviderHost.swift in Sources */ = {isa = PBXBuildFile; fileRef = 587A01FB23F1F0BE00B68763 /* SimulatorTunnelProviderHost.swift */; };
 		587AD7C623421D7000E93A53 /* TunnelSettingsV1.swift in Sources */ = {isa = PBXBuildFile; fileRef = 587AD7C523421D7000E93A53 /* TunnelSettingsV1.swift */; };
@@ -770,6 +771,7 @@
 		5878A278290954790096FC88 /* TunnelViewControllerInteractor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TunnelViewControllerInteractor.swift; sourceTree = "<group>"; };
 		5878A27A2909649A0096FC88 /* CustomOverlayRenderer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CustomOverlayRenderer.swift; sourceTree = "<group>"; };
 		5878A27C2909657C0096FC88 /* RevokedDeviceInteractor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = RevokedDeviceInteractor.swift; sourceTree = "<group>"; };
+		5878F4FF29CDA742003D4BE2 /* UIView+AutoLayoutBuilder.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIView+AutoLayoutBuilder.swift"; sourceTree = "<group>"; };
 		587988C628A2A01F00E3DF54 /* AccountDataThrottling.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AccountDataThrottling.swift; sourceTree = "<group>"; };
 		587A01FB23F1F0BE00B68763 /* SimulatorTunnelProviderHost.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SimulatorTunnelProviderHost.swift; sourceTree = "<group>"; };
 		587AD7C523421D7000E93A53 /* TunnelSettingsV1.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TunnelSettingsV1.swift; sourceTree = "<group>"; };
@@ -1419,6 +1421,7 @@
 				E158B35F285381C60002F069 /* String+AccountFormatting.swift */,
 				5891BF5025E66B1E006D6FB0 /* UIBarButtonItem+KeyboardNavigation.swift */,
 				587CBFE222807F530028DED3 /* UIColor+Helpers.swift */,
+				5878F4FF29CDA742003D4BE2 /* UIView+AutoLayoutBuilder.swift */,
 			);
 			path = Extensions;
 			sourceTree = "<group>";
@@ -2680,6 +2683,7 @@
 				583FE01229C0F99A006E85F9 /* PresentationControllerDismissalInterceptor.swift in Sources */,
 				58677712290976FB006F721F /* SettingsInteractor.swift in Sources */,
 				58CE5E66224146200008646E /* LoginViewController.swift in Sources */,
+				5878F50029CDA742003D4BE2 /* UIView+AutoLayoutBuilder.swift in Sources */,
 				583FE01029C0F532006E85F9 /* CustomSplitViewController.swift in Sources */,
 				58EF580B25D69D7A00AEBA94 /* ProblemReportSubmissionOverlayView.swift in Sources */,
 				5892A45E265FABFF00890742 /* EmptyTableViewHeaderFooterView.swift in Sources */,
diff --git a/ios/MullvadVPN/Extensions/UIView+AutoLayoutBuilder.swift b/ios/MullvadVPN/Extensions/UIView+AutoLayoutBuilder.swift
new file mode 100644
index 0000000000..7e207b0c68
--- /dev/null
+++ b/ios/MullvadVPN/Extensions/UIView+AutoLayoutBuilder.swift
@@ -0,0 +1,231 @@
+//
+//  UIView+AutoLayoutBuilder.swift
+//  MullvadVPN
+//
+//  Created by pronebird on 24/03/2023.
+//  Copyright © 2023 Mullvad VPN AB. All rights reserved.
+//
+
+import UIKit
+
+extension UIView {
+    /**
+     Pin edges to edges of other view edges.
+     */
+    func pinEdgesTo(
+        _ other: UIView,
+        insets: NSDirectionalEdgeInsets = .zero,
+        excludingEdges: NSDirectionalRectEdge = []
+    ) -> [NSLayoutConstraint] {
+        var constraints = [NSLayoutConstraint]()
+
+        if !excludingEdges.contains(.top) {
+            constraints.append(
+                topAnchor.constraint(equalTo: other.topAnchor, constant: insets.top)
+            )
+        }
+
+        if !excludingEdges.contains(.bottom) {
+            constraints.append(
+                bottomAnchor.constraint(equalTo: other.bottomAnchor, constant: insets.bottom)
+            )
+        }
+
+        if !excludingEdges.contains(.leading) {
+            constraints.append(
+                leadingAnchor.constraint(equalTo: other.leadingAnchor, constant: insets.leading)
+            )
+        }
+
+        if !excludingEdges.contains(.trailing) {
+            constraints.append(
+                trailingAnchor.constraint(equalTo: other.trailingAnchor, constant: insets.trailing)
+            )
+        }
+
+        return constraints
+    }
+
+    /**
+     Pin edges to superview edges.
+     */
+    func pinEdgesToSuperview(
+        insets: NSDirectionalEdgeInsets = .zero,
+        excludingEdges: NSDirectionalRectEdge = []
+    ) -> [NSLayoutConstraint] {
+        guard let superview = superview else { return [] }
+
+        return pinEdgesTo(superview, insets: insets, excludingEdges: excludingEdges)
+    }
+
+    /**
+     Pin edges to superview margins.
+     */
+    func pinEdgesToSuperviewMargins(
+        insets: NSDirectionalEdgeInsets = .zero,
+        excludingEdges: NSDirectionalRectEdge = []
+    ) -> [NSLayoutConstraint] {
+        guard let superview = superview else { return [] }
+
+        return pinEdgesToMargins(superview, insets: insets, excludingEdges: excludingEdges)
+    }
+
+    /**
+     Pin edges to other view layout margins.
+     */
+    func pinEdgesToMargins(
+        _ other: UIView,
+        insets: NSDirectionalEdgeInsets = .zero,
+        excludingEdges: NSDirectionalRectEdge = []
+    ) -> [NSLayoutConstraint] {
+        return pinEdgesTo(other.layoutMarginsGuide, insets: insets, excludingEdges: excludingEdges)
+    }
+
+    /**
+     Pin edges to layout guide.
+     */
+    func pinEdgesTo(
+        _ layoutGuide: UILayoutGuide,
+        insets: NSDirectionalEdgeInsets = .zero,
+        excludingEdges: NSDirectionalRectEdge = []
+    ) -> [NSLayoutConstraint] {
+        var constraints = [NSLayoutConstraint]()
+
+        if !excludingEdges.contains(.top) {
+            constraints.append(
+                topAnchor.constraint(equalTo: layoutGuide.topAnchor, constant: insets.top)
+            )
+        }
+
+        if !excludingEdges.contains(.bottom) {
+            constraints.append(
+                bottomAnchor.constraint(
+                    equalTo: layoutGuide.bottomAnchor,
+                    constant: insets.bottom
+                )
+            )
+        }
+
+        if !excludingEdges.contains(.leading) {
+            constraints.append(
+                leadingAnchor.constraint(
+                    equalTo: layoutGuide.leadingAnchor,
+                    constant: insets.leading
+                )
+            )
+        }
+
+        if !excludingEdges.contains(.trailing) {
+            constraints.append(
+                trailingAnchor.constraint(
+                    equalTo: layoutGuide.trailingAnchor,
+                    constant: insets.trailing
+                )
+            )
+        }
+
+        return constraints
+    }
+
+    /**
+     Pin horizontal edges to other view edges.
+     */
+    func pinHorizontalEdgesTo(
+        _ other: UIView,
+        leadingInset: CGFloat = .zero,
+        trailingInset: CGFloat = .zero
+    ) -> [NSLayoutConstraint] {
+        return pinEdgesTo(
+            other,
+            insets: NSDirectionalEdgeInsets(
+                top: 0,
+                leading: leadingInset,
+                bottom: 0,
+                trailing: trailingInset
+            ),
+            excludingEdges: [.bottom, .top]
+        )
+    }
+
+    /**
+     Pin horizontal edges to other view layout margins.
+     */
+    func pinHorizontalEdgesToMargins(
+        _ other: UIView,
+        leadingInset: CGFloat = .zero,
+        trailingInset: CGFloat = .zero
+    ) -> [NSLayoutConstraint] {
+        return pinEdgesToMargins(
+            other,
+            insets: NSDirectionalEdgeInsets(
+                top: 0,
+                leading: leadingInset,
+                bottom: 0,
+                trailing: trailingInset
+            ),
+            excludingEdges: [.bottom, .top]
+        )
+    }
+}
+
+/**
+ AutoLayout builder.
+
+ Use it in conjunction with `NSLayoutConstraint.activate()`, for example:
+
+ ```
+ let view = UIView()
+ let subview = UIView()
+
+ subview.translatesAutoresizingMaskIntoConstraints = false
+
+ view.addSubview(subview)
+
+ NSLayoutConstraint.activate {
+    subview.pinEdgesToSuperview(
+        insets: NSDirectionalEdgeInsets(top: 8, leading: 16, bottom: 8, trailing: 24),
+        excludingEdges: .bottom
+    )
+    subview.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor)
+ }
+
+ ```
+ */
+@resultBuilder enum AutoLayoutBuilder {
+    static func buildBlock(_ components: [NSLayoutConstraint]...) -> [NSLayoutConstraint] {
+        return components.flatMap { $0 }
+    }
+
+    static func buildExpression(_ expression: NSLayoutConstraint) -> [NSLayoutConstraint] {
+        return [expression]
+    }
+
+    static func buildExpression(_ expression: [NSLayoutConstraint]) -> [NSLayoutConstraint] {
+        return expression
+    }
+
+    static func buildOptional(_ components: [NSLayoutConstraint]?) -> [NSLayoutConstraint] {
+        return components ?? []
+    }
+
+    static func buildEither(first components: [NSLayoutConstraint]) -> [NSLayoutConstraint] {
+        return components
+    }
+
+    static func buildEither(second components: [NSLayoutConstraint]) -> [NSLayoutConstraint] {
+        return components
+    }
+
+    static func buildArray(_ components: [[NSLayoutConstraint]]) -> [NSLayoutConstraint] {
+        return components.flatMap { $0 }
+    }
+}
+
+extension NSLayoutConstraint {
+    /**
+     Activate constraints produced by a builder.
+     */
+    static func activate(@AutoLayoutBuilder builder: () -> [NSLayoutConstraint]) {
+        activate(builder())
+    }
+}