MainView.xib

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="9531" systemVersion="15D21" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES">
    <dependencies>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="9529"/>
    </dependencies>
    <objects>
        <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner"/>
        <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>
        <view contentMode="scaleToFill" id="iN0-l3-epB" customClass="MainView">
            <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
            <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
            <subviews>
                <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Kjj-OX-vDF">
                    <rect key="frame" x="169" y="290" width="263" height="21"/>
                    <string key="text">EXAMPLE OF CUSTOM CONTROL
 </string>
                    <fontDescription key="fontDescription" type="system" pointSize="17"/>
                    <color key="textColor" red="0.0" 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="implementable on storyboard" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="v2F-jR-5d7">
                    <rect key="frame" x="223" y="566" width="154" height="14"/>
                    <fontDescription key="fontDescription" type="system" pointSize="11"/>
                    <color key="textColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                    <nil key="highlightedColor"/>
                </label>
            </subviews>
            <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
            <constraints>
                <constraint firstAttribute="bottom" secondItem="v2F-jR-5d7" secondAttribute="bottom" constant="20" id="A5p-Wd-dBN"/>
                <constraint firstItem="Kjj-OX-vDF" firstAttribute="centerY" secondItem="iN0-l3-epB" secondAttribute="centerY" id="WRd-61-khH"/>
                <constraint firstItem="v2F-jR-5d7" firstAttribute="centerX" secondItem="iN0-l3-epB" secondAttribute="centerX" id="lGe-Ks-pNd"/>
                <constraint firstItem="Kjj-OX-vDF" firstAttribute="centerX" secondItem="iN0-l3-epB" secondAttribute="centerX" id="oGH-kO-RgM"/>
            </constraints>
        </view>
    </objects>
</document>