Cleanup

AdvancedTopics/Experimentation/AutoLayoutAndScrollViews/AutoLayoutAndScrollViews/EHMultipleContentViewController.swift

@@ -48,13 +48,17 @@ class EHMultipleContentViewController: UIViewController {
 
         // Now let's lay out the images left-to-right
         let views = ["gil": imageViewGil, "steve": imageViewSteve, "tim": imageViewTim]
+        // These constraints are between the scroll view and a subview of the scroll view.
+        // So they are referring to the scrollView's content, not the scrollView itself.
         let horzConstraints = NSLayoutConstraint.constraints(withVisualFormat: "H:|-[gil]-[steve]-[tim]-|",
                                                              options: .alignAllTop,
                                                              metrics: nil,
                                                              views: views)
         NSLayoutConstraint.activate(horzConstraints)
 
         // Now we just need to align the first image vertically.
+        // These constraints are between the scroll view and a subview of the scroll view.
+        // So they are referring to the scrollView's content, not the scrollView itself.
         let vertConstraints = NSLayoutConstraint.constraints(withVisualFormat: "V:|-[gil]-|",
                                                              options: NSLayoutFormatOptions(rawValue: 0),
                                                              metrics: nil,

AdvancedTopics/Experimentation/LearnAboutSizeClasses/LearnAboutSizeClasses/Base.lproj/Main.storyboard

@@ -34,13 +34,13 @@
                                 <nil key="highlightedColor"/>
                             </label>
                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Regular Width" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Dox-lu-DH7">
-                                <rect key="frame" x="133" y="323" width="108.5" height="21"/>
+                                <rect key="frame" x="330" y="501.5" width="108.5" height="21"/>
                                 <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                 <color key="textColor" red="1" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                                 <nil key="highlightedColor"/>
                             </label>
                             <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Regular Height" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="YiT-cP-Fht">
-                                <rect key="frame" x="130.5" y="363" width="113.5" height="21"/>
+                                <rect key="frame" x="131" y="363" width="113.5" height="21"/>
                                 <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                 <color key="textColor" red="1" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                                 <nil key="highlightedColor"/>

AdvancedTopics/Experimentation/ScrollViewPlayground.playground/Contents.swift

@@ -0,0 +1,30 @@
+//: Playground - noun: a place where people can play
+
+import UIKit
+import PlaygroundSupport
+
+class ScrollViewDelegate: NSObject, UIScrollViewDelegate {
+
+    func scrollViewDidScroll(_ scrollView: UIScrollView) {
+        print("scrollView.bounds = \(scrollView.bounds)")
+    }
+}
+
+let containerView = UIView(frame: CGRect(x: 0.0, y: 0.0, width: 512.0, height: 512.0))
+containerView.backgroundColor = UIColor.lightGray
+
+let scrollView = UIScrollView(frame: CGRect(x: 20.0, y: 20.0, width: 472.0, height: 472.0))
+let scrollViewDelegate = ScrollViewDelegate()
+scrollView.delegate = scrollViewDelegate
+
+let image = UIImage(named: "tim-xlarge.jpg")
+let imageView = UIImageView(image: image)
+scrollView.addSubview(imageView)
+scrollView.contentSize = image?.size ?? CGSize(width: 472.0, height: 472.0)
+
+containerView.addSubview(scrollView)
+
+
+PlaygroundPage.current.liveView = containerView
+PlaygroundPage.current.needsIndefiniteExecution = true
+

AdvancedTopics/Experimentation/ScrollViewPlayground.playground/contents.xcplayground

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<playground version='5.0' target-platform='ios'>
+    <timeline fileName='timeline.xctimeline'/>
+</playground>

AdvancedTopics/Experimentation/ScrollViewPlayground.playground/timeline.xctimeline

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Timeline
+   version = "3.0">
+   <TimelineItems>
+   </TimelineItems>
+</Timeline>

Debugging/Experimentation/DebuggingAutoLayout/DebuggingAutoLayout.xcodeproj/xcuserdata/ehyche.xcuserdatad/xcschemes/DebuggingAutoLayout.xcscheme

@@ -72,7 +72,7 @@
          </CommandLineArgument>
          <CommandLineArgument
             argument = "-_UIConstraintBasedLayoutPlaySoundOnUnsatisfiable YES"
-            isEnabled = "NO">
+            isEnabled = "YES">
          </CommandLineArgument>
          <CommandLineArgument
             argument = "-_UIConstraintBasedLayoutPlaySoundWhenEngaged YES"