Вы можете исправить вещи так, как вы это делаете, но ...
Вместо того, чтобы активировать второе ограничение (вы не показываете, где вы деактивируете ограничение showingCon), Я собираюсь предложить вам использовать одно ограничение Height для вашего текстового представления и изменить значение .constant ...
Вот очень простой c пример, который работает для меня:
import UIKit
class ShrinkTextViewCell: UITableViewCell {
@IBOutlet var textViewHeightConstraint: NSLayoutConstraint!
@IBOutlet var theTextView: UITextView!
var tableUpdateCallback: (()->())?
@IBAction func didTap(_ sender: Any) {
if theTextView.alpha > 0.0 {
UIView.animate(withDuration: 0.5) {
self.theTextView.alpha = 0.0
self.textViewHeightConstraint.constant = 0
self.contentView.layoutIfNeeded()
self.tableUpdateCallback?()
}
} else {
UIView.animate(withDuration: 0.5) {
self.theTextView.alpha = 1.0
self.textViewHeightConstraint.constant = 128
self.contentView.layoutIfNeeded()
self.tableUpdateCallback?()
}
}
}
}
class ShrinkTextViewTableViewController: UITableViewController {
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 5
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let c = tableView.dequeueReusableCell(withIdentifier: "ShrinkTextViewCell", for: indexPath) as! ShrinkTextViewCell
c.tableUpdateCallback = {
tableView.beginUpdates()
tableView.endUpdates()
}
return c
}
}
и вот источник Раскадровки:
<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="15505" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="9iy-6q-gap">
<device id="retina4_7" orientation="portrait" appearance="light"/>
<dependencies>
<deployment identifier="iOS"/>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="15510"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--Shrink Text View Table View Controller-->
<scene sceneID="oHl-Pu-bIJ">
<objects>
<tableViewController id="wSO-s3-dB0" customClass="ShrinkTextViewTableViewController" customModule="scratchy" 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="WtR-bt-uSy">
<rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<color key="backgroundColor" systemColor="systemBackgroundColor" cocoaTouchSystemColor="whiteColor"/>
<prototypes>
<tableViewCell clipsSubviews="YES" contentMode="scaleToFill" preservesSuperviewLayoutMargins="YES" selectionStyle="default" indentationWidth="10" reuseIdentifier="ShrinkTextViewCell" rowHeight="189" id="gZx-b8-Hf3" customClass="ShrinkTextViewCell" customModule="scratchy" customModuleProvider="target">
<rect key="frame" x="0.0" y="28" width="375" height="189"/>
<autoresizingMask key="autoresizingMask"/>
<tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" preservesSuperviewLayoutMargins="YES" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="gZx-b8-Hf3" id="xmG-jI-EeI">
<rect key="frame" x="0.0" y="0.0" width="375" height="189"/>
<autoresizingMask key="autoresizingMask"/>
<subviews>
<textView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" textAlignment="natural" translatesAutoresizingMaskIntoConstraints="NO" id="CGL-ug-wBr">
<rect key="frame" x="16" y="11" width="240" height="128"/>
<color key="backgroundColor" red="0.99953407049999998" green="0.98835557699999999" blue="0.47265523669999998" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
<constraints>
<constraint firstAttribute="width" constant="240" id="Dip-pf-MUH"/>
<constraint firstAttribute="height" priority="999" constant="128" id="mK2-jh-d1y"/>
</constraints>
<string key="text">Lorem ipsum dolor sit er elit lamet, consectetaur cillium adipisicing pecu, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum. Nam liber te conscient to factor tum poen legum odioque civiuda.</string>
<color key="textColor" systemColor="labelColor" cocoaTouchSystemColor="darkTextColor"/>
<fontDescription key="fontDescription" type="system" pointSize="14"/>
<textInputTraits key="textInputTraits" autocapitalizationType="sentences"/>
</textView>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="vto-8g-NOW">
<rect key="frame" x="313" y="11" width="46" height="30"/>
<color key="backgroundColor" red="0.92143100499999997" green="0.92145264149999995" blue="0.92144101860000005" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
<state key="normal" title="Button"/>
<connections>
<action selector="didTap:" destination="gZx-b8-Hf3" eventType="touchUpInside" id="4nC-JL-rWD"/>
</connections>
</button>
</subviews>
<constraints>
<constraint firstAttribute="bottomMargin" relation="greaterThanOrEqual" secondItem="vto-8g-NOW" secondAttribute="bottom" id="5P3-E0-KJV"/>
<constraint firstItem="CGL-ug-wBr" firstAttribute="leading" secondItem="xmG-jI-EeI" secondAttribute="leadingMargin" id="6C9-8M-fUa"/>
<constraint firstItem="vto-8g-NOW" firstAttribute="top" secondItem="xmG-jI-EeI" secondAttribute="topMargin" id="Fwc-nY-zK8"/>
<constraint firstAttribute="trailingMargin" secondItem="vto-8g-NOW" secondAttribute="trailing" id="Gfq-Ps-hxG"/>
<constraint firstAttribute="bottomMargin" relation="greaterThanOrEqual" secondItem="CGL-ug-wBr" secondAttribute="bottom" id="PFA-sR-BPk"/>
<constraint firstItem="CGL-ug-wBr" firstAttribute="top" secondItem="xmG-jI-EeI" secondAttribute="topMargin" id="vyi-D5-OSn"/>
</constraints>
</tableViewCellContentView>
<connections>
<outlet property="textViewHeightConstraint" destination="mK2-jh-d1y" id="jgg-nH-KJ0"/>
<outlet property="theTextView" destination="CGL-ug-wBr" id="GRu-g4-TPK"/>
</connections>
</tableViewCell>
</prototypes>
<connections>
<outlet property="dataSource" destination="wSO-s3-dB0" id="hW0-YN-O65"/>
<outlet property="delegate" destination="wSO-s3-dB0" id="S0F-gf-dAv"/>
</connections>
</tableView>
<navigationItem key="navigationItem" id="HhZ-lH-fRh"/>
</tableViewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="S7z-u4-GiE" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="357.60000000000002" y="2048.7256371814096"/>
</scene>
<!--Navigation Controller-->
<scene sceneID="PyK-HU-aub">
<objects>
<navigationController automaticallyAdjustsScrollViewInsets="NO" id="9iy-6q-gap" sceneMemberID="viewController">
<toolbarItems/>
<navigationBar key="navigationBar" contentMode="scaleToFill" insetsLayoutMarginsFromSafeArea="NO" id="M2B-qr-tr5">
<rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
<autoresizingMask key="autoresizingMask"/>
</navigationBar>
<nil name="viewControllers"/>
<connections>
<segue destination="wSO-s3-dB0" kind="relationship" relationship="rootViewController" id="ghB-H0-NIB"/>
</connections>
</navigationController>
<placeholder placeholderIdentifier="IBFirstResponder" id="AAD-E1-PrO" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="-581.60000000000002" y="2048.7256371814096"/>
</scene>
</scenes>
</document>
Вывод выглядит так:
Когда вы нажимаете кнопку в каждой ячейке, текстовое представление в этой ячейке будет «уменьшаться и исчезать» или «расти и исчезать».