I'm trying to show a UILabel with variable text length so I need it to be inside UIScrollView. Here is the result
the problem is when the text is short UILabel is sticking to the top and when I'm removing the top and bottom constraint and adding vertical center constraint I'm getting this errror
How can I fix it?
I have manage to do it by adding vertical center (priority 750) to container view. Added storyboard source below, it should scroll when you add longer text to label.
<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="14109" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
<device id="retina4_7" orientation="portrait">
<adaptation id="fullscreen"/>
</device>
<dependencies>
<deployment identifier="iOS"/>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="14088"/>
<capability name="Safe area layout guides" minToolsVersion="9.0"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="tne-QT-ifu">
<objects>
<viewController id="BYZ-38-t0r" customClass="ViewController" sceneMemberID="viewController">
<view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<scrollView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="gQl-vh-MlV">
<rect key="frame" x="0.0" y="20" width="375" height="647"/>
<subviews>
<view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="7JP-ij-rQ3">
<rect key="frame" x="0.0" y="0.0" width="375" height="647"/>
<subviews>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" textAlignment="natural" lineBreakMode="tailTruncation" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="hdc-ci-8Q2">
<rect key="frame" x="20" y="20" width="335" height="607"/>
<string key="text">Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum Lorem ipsum </string>
<fontDescription key="fontDescription" type="system" pointSize="17"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
</subviews>
<color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
<constraints>
<constraint firstAttribute="bottom" secondItem="hdc-ci-8Q2" secondAttribute="bottom" constant="20" id="04P-f7-0B8"/>
<constraint firstItem="hdc-ci-8Q2" firstAttribute="top" secondItem="7JP-ij-rQ3" secondAttribute="top" constant="20" id="AJ1-ka-NVH"/>
<constraint firstAttribute="trailing" secondItem="hdc-ci-8Q2" secondAttribute="trailing" constant="20" id="Ihl-iD-MJL"/>
<constraint firstItem="hdc-ci-8Q2" firstAttribute="leading" secondItem="7JP-ij-rQ3" secondAttribute="leading" constant="20" id="Mea-zN-gQ6"/>
</constraints>
</view>
</subviews>
<constraints>
<constraint firstAttribute="bottom" secondItem="7JP-ij-rQ3" secondAttribute="bottom" priority="250" id="5Pl-Zc-jKy"/>
<constraint firstItem="7JP-ij-rQ3" firstAttribute="leading" secondItem="gQl-vh-MlV" secondAttribute="leading" id="6wk-HX-XUh"/>
<constraint firstItem="7JP-ij-rQ3" firstAttribute="centerY" secondItem="gQl-vh-MlV" secondAttribute="centerY" priority="750" id="a7o-hw-NRM"/>
<constraint firstAttribute="trailing" secondItem="7JP-ij-rQ3" secondAttribute="trailing" id="hSU-wA-1v0"/>
<constraint firstItem="7JP-ij-rQ3" firstAttribute="top" secondItem="gQl-vh-MlV" secondAttribute="top" id="o0p-fH-VhV"/>
<constraint firstItem="7JP-ij-rQ3" firstAttribute="width" secondItem="gQl-vh-MlV" secondAttribute="width" id="wgf-e8-HLU"/>
</constraints>
</scrollView>
</subviews>
<color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
<constraints>
<constraint firstItem="6Tk-OE-BBY" firstAttribute="bottom" secondItem="gQl-vh-MlV" secondAttribute="bottom" id="Axy-dp-ZiJ"/>
<constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" secondItem="gQl-vh-MlV" secondAttribute="trailing" id="LED-nS-Ba6"/>
<constraint firstItem="gQl-vh-MlV" firstAttribute="top" secondItem="6Tk-OE-BBY" secondAttribute="top" id="RS2-MF-Aya"/>
<constraint firstItem="gQl-vh-MlV" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" id="euc-Qn-E0q"/>
</constraints>
<viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
</view>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
</objects>
</scene>
</scenes>
</document>
You can remove top constraint and add vertical center and horizontal center constrains to your label so your label should be at center of scrollview
