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I had been running Xcode to learn to develop ios Apps. All was working fine but Xcode kept freezing and I'd half to force quit. It was suggested I reintall Xcode. I did that and it seemed to reinstall fine.

Now, however, Xcode launches but it won't open the Main.storyboard file. It opens and you can edit the text files but when I try to open Main.storyboard, or LaunchScreen.storyboard, a gear-like icon starts turning but it never loads a file.

Can someone please help me get Xcode working.

I'm running High Sierra 10.13.6 and Xcode 10.1.

Here is the source code for Main.storyboard


<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14460.31" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="ygV-oz-tLR">
    <device id="retina4_7" orientation="portrait">
        <adaptation id="fullscreen"/>
    </device>
    <dependencies>
        <deployment identifier="iOS"/>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14460.20"/>
        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
    </dependencies>
    <scenes>
        <!--ToDo List-->
        <scene sceneID="A9s-AT-4j0">
            <objects>
                <tableViewController id="yR9-hP-vAV" customClass="ToDoTableViewController" customModule="ToDo_List" customModuleProvider="target" sceneMemberID="viewController">
                    <tableView key="view" clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="28" sectionFooterHeight="28" id="Ixa-rN-v7n">
                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                        <prototypes>
                            <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" preservesSuperviewLayoutMargins="YES" selectionStyle="default" indentationWidth="10" id="ngh-G9-ONg">
                                <rect key="frame" x="0.0" y="28" width="375" height="44"/>
                                <autoresizingMask key="autoresizingMask"/>
                                <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" preservesSuperviewLayoutMargins="YES" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="ngh-G9-ONg" id="cWC-8W-qDK">
                                    <rect key="frame" x="0.0" y="0.0" width="375" height="43.5"/>
                                    <autoresizingMask key="autoresizingMask"/>
                                </tableViewCellContentView>
                            </tableViewCell>
                        </prototypes>
                        <connections>
                            <outlet property="dataSource" destination="yR9-hP-vAV" id="cpa-VR-las"/>
                            <outlet property="delegate" destination="yR9-hP-vAV" id="PVd-rM-Yqu"/>
                        </connections>
                    </tableView>
                    <navigationItem key="navigationItem" title="ToDo List" id="1K6-Q0-zG0">
                        <barButtonItem key="rightBarButtonItem" systemItem="add" id="fBK-eZ-L90">
                            <connections>
                                <segue destination="xmu-tN-ZMm" kind="show" id="aVw-WO-sTe"/>
                            </connections>
                        </barButtonItem>
                    </navigationItem>
                    <connections>
                        <segue destination="B4l-Zb-T9m" kind="show" identifier="moveToComplete" id="b7Q-gS-cwz"/>
                    </connections>
                </tableViewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="ILe-S0-MPF" userLabel="First Responder" sceneMemberID="firstResponder"/>
            </objects>
            <point key="canvasLocation" x="1610" y="-429"/>
        </scene>
        <!--Create To Do View Controller-->
        <scene sceneID="crg-nJ-Vb3">
            <objects>
                <viewController id="xmu-tN-ZMm" customClass="CreateToDoViewController" customModule="ToDo_List" customModuleProvider="target" sceneMemberID="viewController">
                    <view key="view" contentMode="scaleToFill" id="k2t-ln-joT">
                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <subviews>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Task" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="QMa-uF-UB2">
                                <rect key="frame" x="164" y="95" width="47.5" height="29"/>
                                <fontDescription key="fontDescription" type="system" pointSize="24"/>
                                <nil key="textColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <textField opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="center" borderStyle="bezel" placeholder="Buy Eggs" textAlignment="center" minimumFontSize="17" translatesAutoresizingMaskIntoConstraints="NO" id="ZJ9-HW-zPC">
                                <rect key="frame" x="25" y="132" width="325" height="34"/>
                                <nil key="textColor"/>
                                <fontDescription key="fontDescription" type="system" pointSize="24"/>
                                <textInputTraits key="textInputTraits"/>
                            </textField>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Important?" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="NCJ-uw-GE1">
                                <rect key="frame" x="131" y="205" width="113" height="29"/>
                                <fontDescription key="fontDescription" type="system" pointSize="24"/>
                                <nil key="textColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <switch opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" contentHorizontalAlignment="center" contentVerticalAlignment="center" translatesAutoresizingMaskIntoConstraints="NO" id="lQa-iU-USM">
                                <rect key="frame" x="163" y="244" width="51" height="31"/>
                            </switch>
                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="QLZ-dz-gZY">
                                <rect key="frame" x="166" y="313" width="43" height="41"/>
                                <fontDescription key="fontDescription" type="system" pointSize="24"/>
                                <state key="normal" title="Add"/>
                                <connections>
                                    <action selector="addTapped:" destination="xmu-tN-ZMm" eventType="touchUpInside" id="OwY-gs-dRH"/>
                                </connections>
                            </button>
                        </subviews>
                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                        <constraints>
                            <constraint firstItem="QMa-uF-UB2" firstAttribute="top" secondItem="PUs-XU-5Va" secondAttribute="top" constant="31" id="50H-Kd-uRn"/>
                            <constraint firstItem="ZJ9-HW-zPC" firstAttribute="centerX" secondItem="k2t-ln-joT" secondAttribute="centerX" id="61r-ue-1mo"/>
                            <constraint firstItem="QLZ-dz-gZY" firstAttribute="centerX" secondItem="k2t-ln-joT" secondAttribute="centerX" id="BN6-mZ-rwD"/>
                            <constraint firstItem="QMa-uF-UB2" firstAttribute="centerX" secondItem="k2t-ln-joT" secondAttribute="centerX" id="J9w-Ou-EWI"/>
                            <constraint firstItem="NCJ-uw-GE1" firstAttribute="centerX" secondItem="k2t-ln-joT" secondAttribute="centerX" id="MZY-e1-lOr"/>
                            <constraint firstItem="lQa-iU-USM" firstAttribute="centerX" secondItem="k2t-ln-joT" secondAttribute="centerX" id="bNr-NW-ddD"/>
                            <constraint firstItem="ZJ9-HW-zPC" firstAttribute="leading" secondItem="PUs-XU-5Va" secondAttribute="leading" constant="25" id="hue-hV-lLs"/>
                            <constraint firstItem="lQa-iU-USM" firstAttribute="firstBaseline" secondItem="NCJ-uw-GE1" secondAttribute="baseline" constant="16" symbolType="layoutAnchor" id="kUT-Zs-1gg"/>
                            <constraint firstItem="NCJ-uw-GE1" firstAttribute="top" secondItem="ZJ9-HW-zPC" secondAttribute="bottom" constant="39" id="oQo-Uu-0Qp"/>
                            <constraint firstItem="PUs-XU-5Va" firstAttribute="trailing" secondItem="ZJ9-HW-zPC" secondAttribute="trailing" constant="25" id="oTN-xi-wpK"/>
                            <constraint firstItem="QLZ-dz-gZY" firstAttribute="top" secondItem="lQa-iU-USM" secondAttribute="bottom" constant="38" id="tMz-0b-mL3"/>
                            <constraint firstItem="ZJ9-HW-zPC" firstAttribute="top" secondItem="QMa-uF-UB2" secondAttribute="bottom" constant="8" id="xrJ-dT-oA7"/>
                        </constraints>
                        <viewLayoutGuide key="safeArea" id="PUs-XU-5Va"/>
                    </view>
                    <connections>
                        <outlet property="ImportantSwitch" destination="lQa-iU-USM" id="KcW-b1-3iy"/>
                        <outlet property="nameTextfield" destination="ZJ9-HW-zPC" id="Dbd-lL-UYg"/>
                    </connections>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="XVC-FI-qmt" userLabel="First Responder" sceneMemberID="firstResponder"/>
            </objects>
            <point key="canvasLocation" x="2302" y="-429"/>
        </scene>
        <!--Complete View Controller-->
        <scene sceneID="J4s-0m-7oZ">
            <objects>
                <viewController id="B4l-Zb-T9m" customClass="CompleteViewController" customModule="ToDo_List" customModuleProvider="target" sceneMemberID="viewController">
                    <view key="view" contentMode="scaleToFill" id="gIE-qm-ziM">
                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <subviews>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="center" lineBreakMode="tailTruncation" numberOfLines="3" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="VlY-OE-5rH">
                                <rect key="frame" x="20" y="100" width="335" height="29"/>
                                <fontDescription key="fontDescription" type="system" pointSize="24"/>
                                <nil key="textColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="L1s-7S-g1r">
                                <rect key="frame" x="137" y="135" width="101" height="41"/>
                                <fontDescription key="fontDescription" type="system" pointSize="24"/>
                                <state key="normal" title="Complete"/>
                                <connections>
                                    <action selector="completeTapped:" destination="B4l-Zb-T9m" eventType="touchUpInside" id="Kqw-Fe-o6g"/>
                                </connections>
                            </button>
                        </subviews>
                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                        <constraints>
                            <constraint firstItem="VlY-OE-5rH" firstAttribute="centerX" secondItem="gIE-qm-ziM" secondAttribute="centerX" id="NQb-3P-0Bh"/>
                            <constraint firstItem="q5f-nc-a7m" firstAttribute="trailing" secondItem="VlY-OE-5rH" secondAttribute="trailing" constant="20" id="O1n-Kd-5aL"/>
                            <constraint firstItem="L1s-7S-g1r" firstAttribute="top" secondItem="VlY-OE-5rH" secondAttribute="bottom" constant="6" id="PEm-nv-co8"/>
                            <constraint firstItem="VlY-OE-5rH" firstAttribute="leading" secondItem="q5f-nc-a7m" secondAttribute="leading" constant="20" id="bTf-XD-FK3"/>
                            <constraint firstItem="L1s-7S-g1r" firstAttribute="centerX" secondItem="gIE-qm-ziM" secondAttribute="centerX" id="fev-Xl-h5r"/>
                            <constraint firstItem="VlY-OE-5rH" firstAttribute="top" secondItem="q5f-nc-a7m" secondAttribute="top" constant="36" id="iay-D9-tWA"/>
                            <constraint firstItem="VlY-OE-5rH" firstAttribute="top" secondItem="q5f-nc-a7m" secondAttribute="top" constant="36" id="t6F-85-2uY"/>
                            <constraint firstItem="VlY-OE-5rH" firstAttribute="leading" secondItem="q5f-nc-a7m" secondAttribute="leading" constant="20" id="tEY-Zk-8tN"/>
                            <constraint firstItem="q5f-nc-a7m" firstAttribute="trailing" secondItem="VlY-OE-5rH" secondAttribute="trailing" constant="20" id="tFS-fF-mSN"/>
                            <constraint firstItem="L1s-7S-g1r" firstAttribute="top" secondItem="VlY-OE-5rH" secondAttribute="bottom" constant="6" id="xDx-fv-OjJ"/>
                        </constraints>
                        <viewLayoutGuide key="safeArea" id="q5f-nc-a7m"/>
                    </view>
                    <connections>
                        <outlet property="nameLabel" destination="VlY-OE-5rH" id="R1V-mk-y6s"/>
                    </connections>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="uVo-zX-Ks5" userLabel="First Responder" sceneMemberID="firstResponder"/>
            </objects>
            <point key="canvasLocation" x="1609" y="385"/>
        </scene>
        <!--Navigation Controller-->
        <scene sceneID="boR-hX-Jev">
            <objects>
                <navigationController id="ygV-oz-tLR" sceneMemberID="viewController">
                    <navigationBar key="navigationBar" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" id="SFC-Nc-Db8">
                        <rect key="frame" x="0.0" y="20" width="375" height="44"/>
                        <autoresizingMask key="autoresizingMask"/>
                    </navigationBar>
                    <connections>
                        <segue destination="yR9-hP-vAV" kind="relationship" relationship="rootViewController" id="Z7o-NW-Xqp"/>
                    </connections>
                </navigationController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="urB-J8-cVw" userLabel="First Responder" sceneMemberID="firstResponder"/>
            </objects>
            <point key="canvasLocation" x="658" y="-429"/>
        </scene>
    </scenes>
</document>
  • What happens if you create new Project and try to open the storyboard there? – Mateusz Szlosek Feb 4 at 21:21
  • Same thing. i tried that earlier. Can't open Main.storyboard. – jmh Feb 4 at 21:23
  • Can you right click on a storyboard, open it as a source code and paste the <device> and <dependencies> sections as part of your question? – Mateusz Szlosek Feb 4 at 21:31
  • I copied the source code and pasted it in my question. – jmh Feb 4 at 21:55
  • i'll be happy to do anything else if I can, – jmh Feb 4 at 21:56
1

Source 1
Source 2

There's several things that can wrong with .storyboard files. This is not the only solution to these issues so YMMV. From experience I've found that that cleaning the build folder and/or clearing the Derived Data folder are quick & easy first steps in troubleshooting.

Clean Build Folder

In Xcode, open a code window. Go to the Product -> Clean Build Folder menu command (or use Shift + + K).

Delete Derived Data

In macOS 10.12 and later, this folder should be automatically cleared. Sometimes, manually deleting the files located here will force Xcode to rebuild them, solving some common issues. There's several ways to do almost the same thing:

  1. Terminal
    • Close Xcode.
    • In Terminal, run this command: rm -rf ~/Library/Developer/Xcode/DerivedData
  2. In the Xcode Project
    • Shift + alt + command ⌘ + K will delete the folder for that project.
  3. In the Xcode Project
    • Go to File -> Project Settings for a Project, or File -> Workspace Settings for a Workspace
    • Click the arrow behind the path to go directly to the Derived Data folder enter image description here
    • Close Xcode
    • Delete the contents (subfolders) in the Derived Data folder

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