Question

我不确定这个问题是否重复，但是我基本上是在尝试获取一个UIScrollView，该UIScrollView的UIView中心在水平和垂直方向上都具有高度限制，并且我想知道如何仅使用代码来实现它。我会附加代码，但是我已经做了很多事情，现在不确定哪一个是正确的...

看起来像这样

这就是布局的结构方式：

Caoontainer视图是将通过更改高度约束值来调整大小的视图。

两个“黑色”视图是具有恒定高度大小的页眉和页脚。
蓝色视图将用于附加内容，因此容器视图需要调整高度。

这是一些代码：

override func viewDidLoad() {
    super.viewDidLoad()

    print("\(logClassName) viewDidLoad")
    view.backgroundColor = UIColor.AppColors.mainViewPopupBackground

    view.addSubview(scrollView)
    if #available(iOS 11.0, *) {
        let guide = self.view.safeAreaLayoutGuide
        scrollView.topAnchor.constraint(equalTo: guide.topAnchor).isActive = true
        scrollView.trailingAnchor.constraint(equalTo: guide.trailingAnchor).isActive = true
        scrollView.bottomAnchor.constraint(equalTo: guide.bottomAnchor).isActive = true
        scrollView.leadingAnchor.constraint(equalTo: guide.leadingAnchor).isActive = true
        scrollView.widthAnchor.constraint(equalTo: guide.widthAnchor).isActive = true
        scrollView.heightAnchor.constraint(equalTo: guide.heightAnchor).isActive = true
    }
    else{
        scrollView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
        scrollView.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
        scrollView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
        scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
    }

    let dummyView = UIView()
    dummyView.translatesAutoresizingMaskIntoConstraints = false
    scrollView.addSubview(dummyView)

    dummyView.widthAnchor.constraint(equalTo: scrollView.widthAnchor).isActive = true
    dummyView.topAnchor.constraint(equalTo: scrollView.topAnchor).isActive = true
    dummyView.trailingAnchor.constraint(equalTo: scrollView.trailingAnchor).isActive = true
    dummyView.bottomAnchor.constraint(equalTo: scrollView.bottomAnchor).isActive = true
    dummyView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor).isActive = true


    dummyView.addSubview(contentView)
    contentView.centerYAnchor.constraint(equalTo: dummyView.centerYAnchor).isActive = true
    contentView.centerXAnchor.constraint(equalTo: dummyView.centerXAnchor).isActive = true
    contentView.widthAnchor.constraint(equalTo: dummyView.widthAnchor,multiplier:0.85).isActive = true
    contentView.heightAnchor.constraint(equalToConstant: 500).isActive = true


    contentView.addSubview(titleView)
    titleView.topAnchor.constraint(equalTo: contentView.topAnchor).isActive = true
    titleView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor).isActive = true
    titleView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor).isActive = true
    titleView.heightAnchor.constraint(equalToConstant: 46).isActive = true

    titleView.text = title == nil ? defaultTitle:title!
    titleView.addBottomBorder(color: UIColor.AppColors.defaultSeparator, height: 1, margins: 0)


    contentView.addSubview(buttonsView)
    buttonsView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor).isActive = true
    buttonsView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor).isActive = true
    buttonsView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor).isActive = true
    buttonsView.heightAnchor.constraint(equalToConstant: 46).isActive = true

    let multiplier:CGFloat = buttonDisplay == .both ? 0.5 : 1
    let constant:CGFloat = buttonDisplay == .both ? -0.5 : 0

    if buttonDisplay == .both || buttonDisplay == .cancelOnly {

        buttonsView.addSubview(cancelButton)
        cancelButton.topAnchor.constraint(equalTo: buttonsView.topAnchor).isActive = true
        cancelButton.bottomAnchor.constraint(equalTo: buttonsView.bottomAnchor).isActive = true
        cancelButton.leadingAnchor.constraint(equalTo: buttonsView.leadingAnchor).isActive = true
        cancelButton.widthAnchor.constraint(equalTo: buttonsView.widthAnchor, multiplier: multiplier, constant: constant).isActive = true
        cancelButton.setTitle(AppHelper.printLocalized(withKey: "com.message.cancel", targetSpecific: false), for: .normal)

    }

    if buttonDisplay == .both || buttonDisplay == .confirmOnly {

        buttonsView.addSubview(confirmButton)
        confirmButton.topAnchor.constraint(equalTo: buttonsView.topAnchor).isActive = true
        confirmButton.bottomAnchor.constraint(equalTo: buttonsView.bottomAnchor).isActive = true
        confirmButton.trailingAnchor.constraint(equalTo: buttonsView.trailingAnchor).isActive = true
        confirmButton.widthAnchor.constraint(equalTo: buttonsView.widthAnchor, multiplier: multiplier, constant: constant).isActive = true
        confirmButton.setTitle(AppHelper.printLocalized(withKey: "com.message.ok", targetSpecific: false), for: .normal)

    }

    buttonsView.addTopBorder(color: UIColor.AppColors.defaultSeparator, height: 1, margins: 0)


    contentView.addSubview(containerView)
    containerView.topAnchor.constraint(equalTo: titleView.bottomAnchor).isActive = true
    containerView.bottomAnchor.constraint(equalTo: buttonsView.topAnchor).isActive = true
    containerView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor).isActive = true
    containerView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor).isActive = true
    //containerView.heightAnchor.constraint(equalToConstant: defaultContentViewHeight).isActive = true


    scrollView.contentInset = UIEdgeInsets.zero


}

以及上面代码中使用的变量：

override var title: String?{
    didSet{
        titleView.text = title!
    }
}

var buttonDisplay:ButtonDisplay = ButtonDisplay.both

lazy var scrollView:UIScrollView = {
    let aScrollView = UIScrollView()

    aScrollView.translatesAutoresizingMaskIntoConstraints = false
    aScrollView.bounces = true
    aScrollView.isScrollEnabled = true

    return aScrollView
}()

var defaultContentViewHeight:CGFloat{
    var constant:CGFloat!

    switch AppHelper.traitStatus{
    case .wreghreg:
        constant = 650
    case .wcomhreg:
        constant = 1600
    case .wreghcom:
        constant = 350
    case .wcomhcom:
        constant = 1300
    }

    return constant
}
lazy var contentView:MainView = {

    var rtView = MainView()

    rtView.backgroundColor = UIColor.AppColors.viewPopupBackground
    rtView.translatesAutoresizingMaskIntoConstraints = false

    return rtView

}()

lazy var titleView:MainLabel = {

    var rtLabel = MainLabel(withConfiguration: .popupTitle)
    rtLabel.translatesAutoresizingMaskIntoConstraints = false
    rtLabel.backgroundColor = .green
    return rtLabel

}()

lazy var buttonsView:UIView = {

    var rtView = UIView()
    rtView.translatesAutoresizingMaskIntoConstraints = false
    return rtView

}()
lazy var cancelButton:MainButton = {

    var rtView = MainButton(withConfiguration: .popupSecondary)

    rtView.cornerRadius = 0
    rtView.borderWidth = 0

    rtView.addTarget(self, action: #selector(cancelAction), for: .touchUpInside)
    rtView.translatesAutoresizingMaskIntoConstraints = false

    return rtView

}()
lazy var confirmButton:MainButton = {

    var rtView = MainButton(withConfiguration: .popup)

    rtView.cornerRadius = 0
    rtView.borderWidth = 0

    rtView.addTarget(self, action: #selector(confirmAction(sender:)), for: .touchUpInside)
    rtView.translatesAutoresizingMaskIntoConstraints = false

    return rtView

}()

/*** USE THIS VIEW FOR APPENDING THE SPECIFIC CONTENT ***/
lazy var containerView:MainView = {

    var rtView = MainView()

    rtView.borderWidth = 0
    rtView.cornerRadius = 0

    rtView.backgroundColor = UIColor.red
    rtView.translatesAutoresizingMaskIntoConstraints = false

    return rtView

}()

谢谢

Answer 1

一种方法：

在scrollView中将“根”视图的宽度和高度约束设置为与scrollView相等，但是将“高度”约束的优先级设置为250。

然后将页眉，“扩展内容”和页脚视图放入stackView中。将stackView在“根”视图中垂直居中，并将其顶部和底部约束设置为>= 8（保留8点填充）。

现在，随着“扩展内容”视图更改高度（基于其内容），stackView将变高，但仍保持垂直居中。

添加了足够多的内容以超过scrollView的高度后，“根”视图上的低优先级将使其高度增加并变得可滚动。

这是情节提要中的布局：

这里是少量内容的外观：

，并且当它具有更多内容时（滚动到底部）：

这是调试视图：

浅绿色是scrollView
深绿色是“根”视图
stackView稍微深绿色
黑色页眉/页脚视图
蓝色的“扩展内容”视图

正确设置约束后，无需任何代码即可调整大小或滚动-所有这些操作均由自动版式处理。

要在运行中查看它，请将以下代码用于视图控制器：

//
//  ViewController.swift
//
//  Created by Don Mag on 11/9/18.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet var expandingLabel: UILabel!

    var nLines = 1

    @IBAction func addLineTapped(_ sender: Any) {
        nLines += 1
        setLabelText()
    }

    @IBAction func removeLineTapped(_ sender: Any) {
        if nLines > 2 {
            nLines -= 1
            setLabelText()
        }
    }

    func setLabelText() -> Void {
        var s = ""
        if nLines == 0 {
            s = "Expanding Label"
        } else {
            s = (1...nLines).map({ "Line \($0)" }).joined(separator: "\n")
        }
        expandingLabel.text = s
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        setLabelText()

    }

}

点击“添加行”和“删除行”按钮听起来像：）

以下是故事板的来源：

<?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" customModule="DrawOn" customModuleProvider="target" 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="Vuw-Sq-3ds">
                                <rect key="frame" x="8" y="80" width="359" height="579"/>
                                <subviews>
                                    <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="Fl6-G4-xCj" userLabel="Content View">
                                        <rect key="frame" x="0.0" y="0.0" width="359" height="579"/>
                                        <subviews>
                                            <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="equalSpacing" translatesAutoresizingMaskIntoConstraints="NO" id="jvv-bQ-6hQ">
                                                <rect key="frame" x="40" y="220" width="279" height="140.5"/>
                                                <subviews>
                                                    <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="bGL-74-7Fk" userLabel="Header View">
                                                        <rect key="frame" x="0.0" y="0.0" width="279" height="40"/>
                                                        <subviews>
                                                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Header View 40-pts Height" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="nt9-AP-bCN" userLabel="Header Label">
                                                                <rect key="frame" x="34.5" y="10" width="210" height="20.5"/>
                                                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                                                <color key="textColor" red="0.99999600649999998" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                                <nil key="highlightedColor"/>
                                                            </label>
                                                        </subviews>
                                                        <color key="backgroundColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                        <constraints>
                                                            <constraint firstItem="nt9-AP-bCN" firstAttribute="centerY" secondItem="bGL-74-7Fk" secondAttribute="centerY" id="Ope-LL-yOC"/>
                                                            <constraint firstItem="nt9-AP-bCN" firstAttribute="centerX" secondItem="bGL-74-7Fk" secondAttribute="centerX" id="ZBt-dj-US2"/>
                                                            <constraint firstAttribute="height" constant="40" id="qul-fE-qXK"/>
                                                        </constraints>
                                                    </view>
                                                    <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="HAK-GL-d2e" userLabel="Expanding Label Containing View">
                                                        <rect key="frame" x="0.0" y="40" width="279" height="60.5"/>
                                                        <subviews>
                                                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Expanding Label" textAlignment="center" lineBreakMode="tailTruncation" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="ctw-D5-rv5" userLabel="Expanding Label">
                                                                <rect key="frame" x="8" y="8" width="263" height="44.5"/>
                                                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                                                <nil key="textColor"/>
                                                                <nil key="highlightedColor"/>
                                                            </label>
                                                        </subviews>
                                                        <color key="backgroundColor" red="0.46202266219999999" green="0.83828371759999998" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                        <constraints>
                                                            <constraint firstAttribute="trailing" secondItem="ctw-D5-rv5" secondAttribute="trailing" constant="8" id="1sy-pt-g7z"/>
                                                            <constraint firstItem="ctw-D5-rv5" firstAttribute="top" secondItem="HAK-GL-d2e" secondAttribute="top" constant="8" id="NYL-G7-rQx"/>
                                                            <constraint firstAttribute="bottom" secondItem="ctw-D5-rv5" secondAttribute="bottom" constant="8" id="YK8-wy-8Pa"/>
                                                            <constraint firstItem="ctw-D5-rv5" firstAttribute="leading" secondItem="HAK-GL-d2e" secondAttribute="leading" constant="8" id="qfr-5Z-1gw"/>
                                                        </constraints>
                                                    </view>
                                                    <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="O4w-A4-H6n" userLabel="Footer View">
                                                        <rect key="frame" x="0.0" y="100.5" width="279" height="40"/>
                                                        <subviews>
                                                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Footer View 40-pts Height" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="q6s-5S-Sx9" userLabel="Footer Label">
                                                                <rect key="frame" x="38" y="10" width="203.5" height="20.5"/>
                                                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                                                <color key="textColor" red="0.99999600649999998" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                                <nil key="highlightedColor"/>
                                                            </label>
                                                        </subviews>
                                                        <color key="backgroundColor" white="0.0" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
                                                        <constraints>
                                                            <constraint firstItem="q6s-5S-Sx9" firstAttribute="centerY" secondItem="O4w-A4-H6n" secondAttribute="centerY" id="35l-M2-X4u"/>
                                                            <constraint firstItem="q6s-5S-Sx9" firstAttribute="centerX" secondItem="O4w-A4-H6n" secondAttribute="centerX" id="TqO-pv-FLb"/>
                                                            <constraint firstAttribute="height" constant="40" id="x7P-kS-KhJ"/>
                                                        </constraints>
                                                    </view>
                                                </subviews>
                                            </stackView>
                                        </subviews>
                                        <color key="backgroundColor" red="0.0" green="0.56031829119999998" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                        <constraints>
                                            <constraint firstItem="jvv-bQ-6hQ" firstAttribute="centerY" secondItem="Fl6-G4-xCj" secondAttribute="centerY" id="bDX-eg-0dD"/>
                                            <constraint firstAttribute="bottom" relation="greaterThanOrEqual" secondItem="jvv-bQ-6hQ" secondAttribute="bottom" constant="8" id="c8T-Oc-P0W"/>
                                            <constraint firstItem="jvv-bQ-6hQ" firstAttribute="leading" secondItem="Fl6-G4-xCj" secondAttribute="leading" constant="40" id="gHz-UY-a8e"/>
                                            <constraint firstItem="jvv-bQ-6hQ" firstAttribute="top" relation="greaterThanOrEqual" secondItem="Fl6-G4-xCj" secondAttribute="top" constant="8" id="tDD-Zr-Jne"/>
                                            <constraint firstAttribute="trailing" secondItem="jvv-bQ-6hQ" secondAttribute="trailing" constant="40" id="tke-Qx-y9t"/>
                                        </constraints>
                                    </view>
                                </subviews>
                                <color key="backgroundColor" red="0.45009386540000001" green="0.98132258650000004" blue="0.4743030667" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                <constraints>
                                    <constraint firstItem="Fl6-G4-xCj" firstAttribute="width" secondItem="Vuw-Sq-3ds" secondAttribute="width" id="1LN-nS-m1O"/>
                                    <constraint firstAttribute="trailing" secondItem="Fl6-G4-xCj" secondAttribute="trailing" id="Rgx-xv-bed"/>
                                    <constraint firstAttribute="bottom" secondItem="Fl6-G4-xCj" secondAttribute="bottom" id="hL3-ST-FnS"/>
                                    <constraint firstItem="Fl6-G4-xCj" firstAttribute="top" secondItem="Vuw-Sq-3ds" secondAttribute="top" id="qgo-Qw-qCM"/>
                                    <constraint firstItem="Fl6-G4-xCj" firstAttribute="height" secondItem="Vuw-Sq-3ds" secondAttribute="height" priority="250" id="tiq-6l-uQh"/>
                                    <constraint firstItem="Fl6-G4-xCj" firstAttribute="leading" secondItem="Vuw-Sq-3ds" secondAttribute="leading" id="yYB-d7-S2y"/>
                                </constraints>
                            </scrollView>
                            <stackView opaque="NO" contentMode="scaleToFill" distribution="fillEqually" spacing="40" translatesAutoresizingMaskIntoConstraints="NO" id="NNa-E5-guI">
                                <rect key="frame" x="37.5" y="32" width="300" height="30"/>
                                <subviews>
                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="jeW-uV-cnV">
                                        <rect key="frame" x="0.0" y="0.0" width="130" height="30"/>
                                        <color key="backgroundColor" red="0.99953407049999998" green="0.98835557699999999" blue="0.47265523669999998" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                        <state key="normal" title="Add a Line"/>
                                        <connections>
                                            <action selector="addLineTapped:" destination="BYZ-38-t0r" eventType="touchUpInside" id="NGU-XZ-sUi"/>
                                        </connections>
                                    </button>
                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="1SN-WP-tr5">
                                        <rect key="frame" x="170" y="0.0" width="130" height="30"/>
                                        <color key="backgroundColor" red="0.99953407049999998" green="0.98835557699999999" blue="0.47265523669999998" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                        <state key="normal" title="Remove a Line"/>
                                        <connections>
                                            <action selector="removeLineTapped:" destination="BYZ-38-t0r" eventType="touchUpInside" id="80A-rI-a0B"/>
                                        </connections>
                                    </button>
                                </subviews>
                                <constraints>
                                    <constraint firstAttribute="width" constant="300" id="xdn-ra-Mpq"/>
                                </constraints>
                            </stackView>
                        </subviews>
                        <color key="backgroundColor" red="1" green="0.83234566450000003" blue="0.47320586440000001" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                        <constraints>
                            <constraint firstItem="Vuw-Sq-3ds" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" constant="8" id="0as-vV-CWL"/>
                            <constraint firstItem="NNa-E5-guI" firstAttribute="centerX" secondItem="8bC-Xf-vdC" secondAttribute="centerX" id="EEn-yg-Ba2"/>
                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="bottom" secondItem="Vuw-Sq-3ds" secondAttribute="bottom" constant="8" id="i1E-50-PXU"/>
                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" secondItem="Vuw-Sq-3ds" secondAttribute="trailing" constant="8" id="kep-Qo-OTQ"/>
                            <constraint firstItem="NNa-E5-guI" firstAttribute="top" secondItem="6Tk-OE-BBY" secondAttribute="top" constant="12" id="l5O-iv-7h9"/>
                            <constraint firstItem="Vuw-Sq-3ds" firstAttribute="top" secondItem="6Tk-OE-BBY" secondAttribute="top" constant="60" id="pYU-HL-mIH"/>
                        </constraints>
                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
                    </view>
                    <connections>
                        <outlet property="expandingLabel" destination="ctw-D5-rv5" id="oDW-fm-PtZ"/>
                    </connections>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
            </objects>
        </scene>
    </scenes>
</document>

Answer 2

信息似乎有点不足，尽管这可能有所帮助：

在界面构建器中，为您的容器视图添加高度限制，例如height = 100。
然后从检查器中将'='更改为高度'> ='100
现在，无论何时将任何内容追加为蓝色时，它都会自动调整大小。

注意：还将蓝色视图的约束设置为“> =”某个值。

Answer 3

基于DonMag的答案，我仍然认为这是最好的答案，我已经能够将UIStackView替换为UIView（wrapperView），因此我可以添加边框，并添加了innerView（绿色），可以在其中添加内容，我可以手动选择wrapperView的视图高度。

具有中心可调整大小的视图的UIScrollView通过编程

3 个答案: