Layout constraint helpers

MVMCoreUI.xcodeproj/project.pbxproj

@@ -919,7 +919,6 @@
 		D22479912316A9EF003FCCF9 /* Items */ = {
 			isa = PBXGroup;
 			children = (
-				D2755D7A23689C7500485468 /* TableViewCell.swift */,
 				01EB368923609801006832FA /* ListItemModel.swift */,
 				01509D8E2327EC6F00EF99AA /* MoleculeTableViewCell.swift */,
 				012A88C1238D7BCA00FE3DA1 /* CarouselItemModel.swift */,
@@ -1378,6 +1377,7 @@
 				D2B18B7E2360913400A9AEDC /* Control.swift */,
 				D2B18B802360945C00A9AEDC /* View.swift */,
 				0AE14F63238315D2005417F8 /* TextField.swift */,
+				D2755D7A23689C7500485468 /* TableViewCell.swift */,
 				0A5D59C323AD488600EFD9E9 /* Protocols */,
 			);
 			path = BaseClasses;

MVMCoreUI/BaseClasses/TableViewCell.swift

@@ -28,6 +28,8 @@ import UIKit
     
     private var heroAccessoryCenter: CGPoint?
     
+    private var initialSetupPerformed = false
+    
     // MARK: - Styling
     open func style(with styleString: String?) {
         guard let styleString = styleString else {
@@ -102,12 +104,19 @@ import UIKit
     // MARK: - Inits
     public override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
         super.init(style: style, reuseIdentifier: reuseIdentifier)
-        setupView()
+        initialSetup()
     }
     
     public required init?(coder aDecoder: NSCoder) {
         super.init(coder: aDecoder)
-        setupView()
+        initialSetup()
+    }
+    
+    public func initialSetup() {
+        if !initialSetupPerformed {
+            initialSetupPerformed = true
+            setupView()
+        }
     }
     
     // MARK: - MFViewProtocol

MVMCoreUI/Categories/NSLayoutConstraintExtension.swift

@@ -9,36 +9,52 @@
 import Foundation
 
 public extension NSLayoutConstraint {
-    static func pinSubviewsCenter(leftView: UIView, rightView: UIView) {
+    
-        guard let superView = leftView.superview else {
+    /// Pins the views vertically in the super view, allowing the super to expand depending on the tallest view. Shorter views are aligned center.
-            return
+    static func pinViewsVerticalExpandableAlignCenter(_ views: [UIView]) {
+        for view in views {
+            guard let superView = view.superview else {
+                return
+            }
+            view.centerYAnchor.constraint(equalTo: superView.centerYAnchor).isActive = true
+            view.topAnchor.constraint(greaterThanOrEqualTo: superView.layoutMarginsGuide.topAnchor).isActive = true
+            superView.layoutMarginsGuide.bottomAnchor.constraint(greaterThanOrEqualTo: view.bottomAnchor).isActive = true
+        
+            var constraint = view.topAnchor.constraint(equalTo: superView.layoutMarginsGuide.topAnchor)
+            constraint.priority = .defaultLow
+            constraint.isActive = true
+        
+            constraint = superView.layoutMarginsGuide.bottomAnchor.constraint(equalTo: view.bottomAnchor)
+            constraint.priority = .defaultLow
+            constraint.isActive = true
         }
-        leftView.centerYAnchor.constraint(equalTo: superView.centerYAnchor).isActive = true
+    }
-        leftView.leftAnchor.constraint(equalTo: superView.layoutMarginsGuide.leftAnchor).isActive = true
-        leftView.topAnchor.constraint(greaterThanOrEqualTo: superView.layoutMarginsGuide.topAnchor).isActive = true
-        superView.layoutMarginsGuide.bottomAnchor.constraint(greaterThanOrEqualTo: leftView.bottomAnchor).isActive = true
     
-        var constraint = leftView.topAnchor.constraint(equalTo: superView.layoutMarginsGuide.topAnchor)
+    /// Pins the views vertically in the super view, allowing the super to expand depending on the tallest view. Shorter views are aligned top.
-        constraint.priority = .defaultLow
+    static func pinViewsVerticalExpandableAlignTop(_ views: [UIView]) {
-        constraint.isActive = true
+        for view in views {
+            guard let superView = view.superview else {
+                return
+            }
+            view.topAnchor.constraint(equalTo: superView.layoutMarginsGuide.topAnchor).isActive = true
+            superView.layoutMarginsGuide.bottomAnchor.constraint(greaterThanOrEqualTo: view.bottomAnchor).isActive = true
         
-        constraint = superView.layoutMarginsGuide.bottomAnchor.constraint(equalTo: leftView.bottomAnchor)
+            let constraint = superView.layoutMarginsGuide.bottomAnchor.constraint(equalTo: view.bottomAnchor)
-        constraint.priority = .defaultLow
+            constraint.priority = .defaultLow
-        constraint.isActive = true
+            constraint.isActive = true
+        }
+    }
     
-        rightView.leftAnchor.constraint(greaterThanOrEqualTo: leftView.rightAnchor, constant: 16).isActive = true
+    /// Pins a view to the left and a view to the right, flexible space in between. The super can expand depending on the taller view. Shorter views are aligned top if alignTop true, else aligned center.
-        
+    static func pinViews(leftView: UIView, rightView: UIView, alignTop: Bool) {
-        rightView.centerYAnchor.constraint(equalTo: superView.centerYAnchor).isActive = true
+        guard let superView = leftView.superview else { return }
-        superView.layoutMarginsGuide.rightAnchor.constraint(equalTo: rightView.rightAnchor).isActive = true
+        if alignTop {
-        rightView.topAnchor.constraint(greaterThanOrEqualTo: superView.layoutMarginsGuide.topAnchor).isActive = true
+            pinViewsVerticalExpandableAlignTop([leftView, rightView])
-        superView.layoutMarginsGuide.bottomAnchor.constraint(greaterThanOrEqualTo: rightView.bottomAnchor).isActive = true
+        } else {
-        
+            pinViewsVerticalExpandableAlignCenter([leftView, rightView])
-        constraint = rightView.topAnchor.constraint(equalTo: superView.layoutMarginsGuide.topAnchor)
+        }
-        constraint.priority = .defaultLow
+        leftView.leadingAnchor.constraint(equalTo: superView.layoutMarginsGuide.leadingAnchor).isActive = true
-        constraint.isActive = true
+        superView.layoutMarginsGuide.trailingAnchor.constraint(equalTo: rightView.trailingAnchor).isActive = true
-        
+        rightView.leftAnchor.constraint(greaterThanOrEqualTo: leftView.rightAnchor, constant: PaddingHorizontalBetweenRelatedItems).isActive = true
-        constraint = superView.layoutMarginsGuide.bottomAnchor.constraint(equalTo: rightView.bottomAnchor)
-        constraint.priority = .defaultLow
-        constraint.isActive = true
     }
 }

MVMCoreUI/Molecules/HorizontalCombinationViews/ImageHeadlineBody.swift

@@ -10,13 +10,14 @@ import UIKit
 
 @objcMembers open class ImageHeadlineBody: View {
     let headlineBody = HeadlineBody(frame: .zero)
-    let imageView = MFLoadImageView()
+    let imageView = MFLoadImageView(pinnedEdges: .all)
     var constraintBetweenImageLabelsConstant: CGFloat = 16
     var constraintBetweenImageLabels: NSLayoutConstraint?
     
     // MARK: - MFViewProtocol
 
     open override func setupView() {
+        super.setupView()
         guard subviews.count == 0 else {
             return
         }
@@ -26,23 +27,9 @@ import UIKit
         addSubview(headlineBody)
         addSubview(imageView)
         
-        headlineBody.topAnchor.constraint(equalTo: topAnchor).isActive = true
+        NSLayoutConstraint.pinViewsVerticalExpandableAlignCenter([imageView, headlineBody])
         rightAnchor.constraint(equalTo: headlineBody.rightAnchor).isActive = true
-        bottomAnchor.constraint(greaterThanOrEqualTo: headlineBody.bottomAnchor).isActive = true
-        var constraint = bottomAnchor.constraint(equalTo: headlineBody.bottomAnchor)
-        constraint.priority = .defaultLow
-        constraint.isActive = true
-        
-        imageView.centerYAnchor.constraint(equalTo: centerYAnchor).isActive = true
         imageView.leftAnchor.constraint(equalTo: leftAnchor).isActive = true
-        imageView.topAnchor.constraint(greaterThanOrEqualTo: topAnchor).isActive = true
-        bottomAnchor.constraint(greaterThanOrEqualTo: imageView.bottomAnchor).isActive = true
-        constraint = bottomAnchor.constraint(equalTo: imageView.bottomAnchor)
-        constraint.priority = UILayoutPriority(rawValue: 200)
-        constraint.isActive = true
-        constraint = imageView.topAnchor.constraint(equalTo: topAnchor)
-        constraint.priority = UILayoutPriority(rawValue: 200)
-        constraint.isActive = true
         
         constraintBetweenImageLabels = headlineBody.leadingAnchor.constraint(equalTo: imageView.trailingAnchor, constant: constraintBetweenImageLabelsConstant)
         constraintBetweenImageLabels?.isActive = true

MVMCoreUI/Molecules/Items/StackItemModel.swift

@@ -8,7 +8,7 @@
 
 import Foundation
 
-@objcMembers public class StackItemModel: StackItemModelProtocol, MoleculeModelProtocol {
+@objcMembers public class StackItemModel: ContainerModel, StackItemModelProtocol, MoleculeModelProtocol {
     public static var identifier: String = "simpleStackItem"
     public var backgroundColor: Color?
     public var spacing: CGFloat?

MVMCoreUI/Molecules/LeftRightViews/ToggleMolecules/HeadlineBodyLinkToggle.swift

@@ -27,7 +27,7 @@ import UIKit
         headlineBodyLink.headlineBody.styleListItem()
         addSubview(headlineBodyLink)
         addSubview(toggle)
-        NSLayoutConstraint.pinSubviewsCenter(leftView: headlineBodyLink, rightView: toggle)
+        NSLayoutConstraint.pinViews(leftView: headlineBodyLink, rightView: toggle, alignTop: false)
     }
     
     // MARK: - MVMCoreUIMoleculeViewProtoco

MVMCoreUI/Molecules/LeftRightViews/ToggleMolecules/HeadlineBodyToggle.swift

@@ -31,7 +31,7 @@ import UIKit
         
         view.addSubview(headlineBody)
         view.addSubview(toggle)
-        NSLayoutConstraint.pinSubviewsCenter(leftView: headlineBody, rightView: toggle)
+        NSLayoutConstraint.pinViews(leftView: headlineBody, rightView: toggle, alignTop: false)
     }
     
     // MARK:- ModelMoleculeViewProtocol

MVMCoreUI/Molecules/LeftRightViews/ToggleMolecules/LabelToggle.swift

@@ -28,7 +28,7 @@ import UIKit
         addSubview(label)
         addSubview(toggle)
         label.setContentHuggingPriority(UILayoutPriority.required, for: NSLayoutConstraint.Axis.vertical)
-        NSLayoutConstraint.pinSubviewsCenter(leftView: label, rightView: toggle)
+        NSLayoutConstraint.pinViews(leftView: label, rightView: toggle, alignTop: false)
     }
     
     // MARK:- ModelMoleculeViewProtocol