DemoViewController.xib

<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="13529" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES" customObjectInstantitationMethod="direct">
    <dependencies>
        <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="13529"/>
        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
    </dependencies>
    <objects>
        <customObject id="-2" userLabel="File's Owner" customClass="DemoViewController" customModule="Demo" customModuleProvider="target">
            <connections>
                <outlet property="errorLabel" destination="riU-Pu-8X3" id="Agi-vW-H5Y"/>
                <outlet property="expressionField" destination="iie-Jn-OJ3" id="PcR-jl-JQf"/>
                <outlet property="flowContainer" destination="XXl-Ws-RCf" id="uez-AS-XrE"/>
                <outlet property="view" destination="CFR-Wx-T40" id="aNW-XN-705"/>
            </connections>
        </customObject>
        <customObject id="-1" userLabel="First Responder" customClass="FirstResponder"/>
        <customObject id="-3" userLabel="Application" customClass="NSObject"/>
        <customView id="CFR-Wx-T40">
            <rect key="frame" x="0.0" y="0.0" width="529" height="431"/>
            <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMinY="YES"/>
            <subviews>
                <textField verticalHuggingPriority="750" translatesAutoresizingMaskIntoConstraints="NO" id="iie-Jn-OJ3">
                    <rect key="frame" x="20" y="389" width="489" height="22"/>
                    <constraints>
                        <constraint firstAttribute="width" relation="greaterThanOrEqual" constant="100" id="JYT-Ed-h8z"/>
                    </constraints>
                    <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" selectable="YES" editable="YES" sendsActionOnEndEditing="YES" state="on" borderStyle="bezel" drawsBackground="YES" id="roQ-dS-16A">
                        <font key="font" metaFont="system"/>
                        <color key="textColor" name="textColor" catalog="System" colorSpace="catalog"/>
                        <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
                    </textFieldCell>
                    <connections>
                        <outlet property="delegate" destination="-2" id="QIf-81-9sx"/>
                    </connections>
                </textField>
                <textField verticalHuggingPriority="750" horizontalCompressionResistancePriority="250" translatesAutoresizingMaskIntoConstraints="NO" id="riU-Pu-8X3">
                    <rect key="frame" x="18" y="367" width="493" height="14"/>
                    <textFieldCell key="cell" sendsActionOnEndEditing="YES" title="Multiline Label" id="xdj-GU-OJa">
                        <font key="font" metaFont="smallSystem"/>
                        <color key="textColor" name="secondaryLabelColor" catalog="System" colorSpace="catalog"/>
                        <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
                    </textFieldCell>
                </textField>
                <customView translatesAutoresizingMaskIntoConstraints="NO" id="XXl-Ws-RCf">
                    <rect key="frame" x="20" y="20" width="489" height="339"/>
                </customView>
            </subviews>
            <constraints>
                <constraint firstItem="XXl-Ws-RCf" firstAttribute="top" secondItem="riU-Pu-8X3" secondAttribute="bottom" constant="8" id="1Rq-JU-bVw"/>
                <constraint firstItem="XXl-Ws-RCf" firstAttribute="leading" secondItem="CFR-Wx-T40" secondAttribute="leading" constant="20" id="9uI-8q-JES"/>
                <constraint firstAttribute="trailing" secondItem="iie-Jn-OJ3" secondAttribute="trailing" constant="20" id="AbI-ge-EE3"/>
                <constraint firstItem="riU-Pu-8X3" firstAttribute="top" secondItem="iie-Jn-OJ3" secondAttribute="bottom" constant="8" id="Lq7-R3-2pd"/>
                <constraint firstAttribute="bottom" secondItem="XXl-Ws-RCf" secondAttribute="bottom" constant="20" id="SOh-5g-MH1"/>
                <constraint firstAttribute="trailing" secondItem="XXl-Ws-RCf" secondAttribute="trailing" constant="20" id="WJk-Af-c8P"/>
                <constraint firstAttribute="trailing" secondItem="riU-Pu-8X3" secondAttribute="trailing" constant="20" id="jhQ-oW-nAQ"/>
                <constraint firstItem="iie-Jn-OJ3" firstAttribute="top" secondItem="CFR-Wx-T40" secondAttribute="top" constant="20" id="kqm-6F-gVT"/>
                <constraint firstItem="riU-Pu-8X3" firstAttribute="leading" secondItem="CFR-Wx-T40" secondAttribute="leading" constant="20" id="udV-5p-6mU"/>
                <constraint firstItem="iie-Jn-OJ3" firstAttribute="leading" secondItem="CFR-Wx-T40" secondAttribute="leading" constant="20" id="y9L-Lb-lIg"/>
            </constraints>
            <point key="canvasLocation" x="322.5" y="366.5"/>
        </customView>
    </objects>
</document>