split last example of chapter 8 into two, one in Swift (prohibitively…

… slow), one in Objective-C

bk2ch08p467collectionViewLayoutFromScratchObjc/ch21p748collectionViewFlowLayout2/Base.lproj/Main.storyboard

@@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6185.11" systemVersion="13E28" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" initialViewController="0xu-nK-N1B">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6190.4"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="cCN-RP-8My">
+            <objects>
+                <collectionViewController autoresizesArchivedViewToFullSize="NO" id="HB2-Ma-jWh" customClass="ViewController" sceneMemberID="viewController">
+                    <collectionView key="view" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" minimumZoomScale="0.0" maximumZoomScale="0.0" dataMode="prototypes" id="LlB-UA-kWU">
+                        <rect key="frame" x="0.0" y="0.0" width="320" height="568"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                        <collectionViewLayout key="collectionViewLayout" id="CSa-Tu-9qI" customClass="MyLayout"/>
+                        <cells/>
+                        <connections>
+                            <outlet property="dataSource" destination="HB2-Ma-jWh" id="kls-ht-7Rp"/>
+                            <outlet property="delegate" destination="HB2-Ma-jWh" id="iHs-Gu-0WL"/>
+                        </connections>
+                    </collectionView>
+                    <navigationItem key="navigationItem" id="rNM-gj-q9Q"/>
+                    <connections>
+                        <segue destination="zGA-DZ-fGa" kind="push" identifier="push" id="46E-wl-2z6"/>
+                    </connections>
+                </collectionViewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="lxD-hh-m9y" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="720" y="107"/>
+        </scene>
+        <!--View Controller2-->
+        <scene sceneID="UjP-7S-lyn">
+            <objects>
+                <collectionViewController autoresizesArchivedViewToFullSize="NO" id="zGA-DZ-fGa" customClass="ViewController2" sceneMemberID="viewController">
+                    <collectionView key="view" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" minimumZoomScale="0.0" maximumZoomScale="0.0" dataMode="prototypes" id="Ca8-jF-93u">
+                        <rect key="frame" x="0.0" y="0.0" width="320" height="568"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" red="1" green="0.50196081400000003" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
+                        <collectionViewFlowLayout key="collectionViewLayout" minimumLineSpacing="10" minimumInteritemSpacing="10" id="wCz-is-5YI" customClass="MyFlowLayout">
+                            <size key="itemSize" width="50" height="50"/>
+                            <size key="headerReferenceSize" width="0.0" height="0.0"/>
+                            <size key="footerReferenceSize" width="0.0" height="0.0"/>
+                            <inset key="sectionInset" minX="0.0" minY="0.0" maxX="0.0" maxY="0.0"/>
+                        </collectionViewFlowLayout>
+                        <cells/>
+                        <connections>
+                            <outlet property="dataSource" destination="zGA-DZ-fGa" id="raD-Dt-jrc"/>
+                            <outlet property="delegate" destination="zGA-DZ-fGa" id="iJz-9I-hV3"/>
+                        </connections>
+                    </collectionView>
+                    <navigationItem key="navigationItem" id="OZT-eb-wqO"/>
+                </collectionViewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="Wfp-Pf-RAK" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="1209" y="123"/>
+        </scene>
+        <!--Navigation Controller-->
+        <scene sceneID="Jpu-E2-pFh">
+            <objects>
+                <navigationController automaticallyAdjustsScrollViewInsets="NO" id="0xu-nK-N1B" sceneMemberID="viewController">
+                    <toolbarItems/>
+                    <navigationBar key="navigationBar" contentMode="scaleToFill" id="Dbt-l6-0GK">
+                        <rect key="frame" x="0.0" y="0.0" width="320" height="44"/>
+                        <autoresizingMask key="autoresizingMask"/>
+                    </navigationBar>
+                    <nil name="viewControllers"/>
+                    <connections>
+                        <segue destination="HB2-Ma-jWh" kind="relationship" relationship="rootViewController" id="xPG-ms-bBj"/>
+                    </connections>
+                </navigationController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dHG-P0-QBl" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="194" y="107"/>
+        </scene>
+    </scenes>
+    <simulatedMetricsContainer key="defaultSimulatedMetrics">
+        <simulatedStatusBarMetrics key="statusBar"/>
+        <simulatedOrientationMetrics key="orientation"/>
+        <simulatedScreenMetrics key="destination" type="retina4">
+            <size key="portraitSize" width="320" height="568"/>
+            <size key="landscapeSize" width="568" height="320"/>
+        </simulatedScreenMetrics>
+    </simulatedMetricsContainer>
+</document>

bk2ch08p467collectionViewLayoutFromScratchObjc/ch21p748collectionViewFlowLayout2/Cell.xib

@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="6185.11" systemVersion="13E28" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6190.4"/>
+    </dependencies>
+    <objects>
+        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
+        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
+        <collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="c69-n7-Tbx" customClass="Cell">
+            <rect key="frame" x="0.0" y="0.0" width="246" height="50"/>
+            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
+            <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center">
+                <rect key="frame" x="0.0" y="0.0" width="246" height="50"/>
+                <autoresizingMask key="autoresizingMask"/>
+                <subviews>
+                    <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="1VV-qg-y0Q">
+                        <rect key="frame" x="0.0" y="0.0" width="246" height="50"/>
+                        <subviews>
+                            <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="FVF-IM-x2t">
+                                <rect key="frame" x="2" y="2" width="242" height="46"/>
+                                <fontDescription key="fontDescription" name="GillSans-Bold" family="Gill Sans" pointSize="17"/>
+                                <color key="textColor" red="0.0" green="1" blue="0.1426398754" alpha="1" colorSpace="calibratedRGB"/>
+                                <color key="highlightedColor" white="0.33333333333333331" alpha="1" colorSpace="calibratedWhite"/>
+                                <color key="shadowColor" red="1" green="0.50196081400000003" blue="0.0" alpha="0.59999999999999998" colorSpace="calibratedRGB"/>
+                                <size key="shadowOffset" width="2" height="2"/>
+                            </label>
+                        </subviews>
+                        <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="calibratedWhite"/>
+                        <constraints>
+                            <constraint firstItem="FVF-IM-x2t" firstAttribute="top" secondItem="1VV-qg-y0Q" secondAttribute="top" constant="2" id="7SI-2i-Tv0"/>
+                            <constraint firstItem="FVF-IM-x2t" firstAttribute="leading" secondItem="1VV-qg-y0Q" secondAttribute="leading" constant="2" id="DO8-WH-fLU"/>
+                            <constraint firstAttribute="trailing" secondItem="FVF-IM-x2t" secondAttribute="trailing" constant="2" id="TEa-in-1ao"/>
+                            <constraint firstAttribute="bottom" secondItem="FVF-IM-x2t" secondAttribute="bottom" constant="2" id="vhX-lP-Ut7"/>
+                        </constraints>
+                    </view>
+                </subviews>
+                <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="calibratedWhite"/>
+                <nil key="simulatedStatusBarMetrics"/>
+                <freeformSimulatedSizeMetrics key="simulatedDestinationMetrics"/>
+            </view>
+            <constraints>
+                <constraint firstAttribute="trailing" secondItem="1VV-qg-y0Q" secondAttribute="trailing" id="K5z-7i-Uge"/>
+                <constraint firstItem="1VV-qg-y0Q" firstAttribute="leading" secondItem="c69-n7-Tbx" secondAttribute="leading" id="OJp-7Y-iMe"/>
+                <constraint firstAttribute="bottom" secondItem="1VV-qg-y0Q" secondAttribute="bottom" id="XJl-3z-MnA"/>
+                <constraint firstItem="1VV-qg-y0Q" firstAttribute="top" secondItem="c69-n7-Tbx" secondAttribute="top" id="ggF-qW-eaq"/>
+            </constraints>
+            <size key="customSize" width="246" height="50"/>
+            <connections>
+                <outlet property="container" destination="1VV-qg-y0Q" id="WYX-sC-E6q"/>
+                <outlet property="lab" destination="FVF-IM-x2t" id="iiY-dg-bso"/>
+            </connections>
+        </collectionViewCell>
+    </objects>
+    <simulatedMetricsContainer key="defaultSimulatedMetrics">
+        <simulatedStatusBarMetrics key="statusBar"/>
+        <simulatedOrientationMetrics key="orientation"/>
+        <simulatedScreenMetrics key="destination" type="retina4">
+            <size key="portraitSize" width="320" height="568"/>
+            <size key="landscapeSize" width="568" height="320"/>
+        </simulatedScreenMetrics>
+    </simulatedMetricsContainer>
+</document>

bk2ch08p467collectionViewLayoutFromScratch/ch21p748collectionViewFlowLayout2/ViewController.m → bk2ch08p467collectionViewLayoutFromScratchObjc/ch21p748collectionViewFlowLayout2/ViewController.m

@@ -1,5 +1,10 @@
 
 
+/*
+ I've provided two independent versions of this example, one Swift, one Objective-C,
+ because the Swift version is prohibitively slow (especially on a device)
+ */
+
 #import "ViewController.h"
 #import "Cell.h"
 

bk2ch08p467collectionViewLayoutFromScratch/ch21p748collectionViewFlowLayout2/ViewController2.m → bk2ch08p467collectionViewLayoutFromScratchObjc/ch21p748collectionViewFlowLayout2/ViewController2.m

@@ -1,8 +1,7 @@
 
 #import "ViewController2.h"
 #import "Cell.h"
-// #import "MyFlowLayout.h"
-#import "ch21p748collectionViewLayoutFromScratch-Swift.h"
+#import "MyFlowLayout.h"
 
 @interface ViewController2 ()
 @end