ios - 如何同时使用水平和垂直 ScrollView (快速)

标签 ios swift xcode uiscrollview scrollview

我正在使用两个 ScrollView 的屏幕(如下所示)工作。 Vertical scroll view 是基础，它有另一个 View 用于显示所有内容。在该 View 中还有另一个水平移动的 ScrollView 。

所以供引用: ScrollView (垂直)-> View -> ScrollView (水平)

要指出的另一件事是第一个 ScrollView 中的固有 TextView ，它从后端提取数据。

我面临的问题是:垂直 ScrollView 允许您上下移动，但它会根据设置的高度停止。因此，如果我将高度设置为 1000，它将到达该点，但不会再进一步​​。如果描述比这更长，它会被截断，所以

1) 如何调整 scrollview(垂直)以便他滚动到需要的程度以显示整个描述文本？基本上，我如何根据 TextView 的高度调整 ScrollView 的高度。

我面临的第二个问题是垂直 ScrollView 有效但水平 ScrollView 无效。我在许多其他具有相同约束(如下所示)的应用程序中使用了此水平 ScrollView ，但从未在垂直 ScrollView 中使用过。既然它在那里，它就不会工作，而另一个工作，反之亦然。所以，

2) 如何正确地约束两个 ScrollView ，以便它们一致工作？垂直 ScrollView 应该上下滚动，每当我在水平 ScrollView 上向左或向右滑动时，它也应该正确移动。

Screen Design

Screen constraints & layout

Screen constraints & layout continued

最佳答案

在垂直 ScrollView 中嵌入水平 ScrollView 很常见 - 您只需要正确设置约束即可。

此外，使用适当的约束，很容易让 ScrollView 的内容控制可滚动区域——无需计算和明确设置.contentSize。

这是布局。主视图背景为粉红色；垂直 ScrollView 为黄色；水平 ScrollView 是绿色的:

enter image description here

垂直 ScrollView 在所有 4 个边上都被限制为 0，并且它被限制为等宽和等高 到主视图。

水平 ScrollView 的前导、顶部和尾部约束为 0(无底部约束)，高度约束为 390，和 它被限制为 Equal Width 到主视图。

ImageView 被限制为 Leading 10，W/H 为 40。

标题标签被限制在 ImageView 中。

描述标签(行数 = 0)被约束导致 ImageView ，宽度等于垂直 ScrollView -20(左边 10 个，右边 10 个)。 并且它在底部被限制为 0。当您向标签添加文本并且其高度增加时，这将自动增加垂直 ScrollView 的可滚动区域(其 .contentSize)的高度。

这是滚动前后的结果:

enter image description here

并且，为了清楚起见，使用 Debug View Hierarchy 时它的外观:

enter image description here

为了帮助您正确设置它，这里是 Controller 类(不需要大小调整代码 - 它所做的只是向标签添加文本):

class EmbeddedScrollViewController: UIViewController {

    @IBOutlet var descriptionLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        // 20 lines of text
        descriptionLabel.text = (1...20).map({ "Line \($0)" }).joined(separator: "\n")

    }
}

和 Storyboard 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="1GW-r8-dyB">
    <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>
        <!--Embedded Scroll View Controller-->
        <scene sceneID="EkT-c0-tFZ">
            <objects>
                <viewController id="1GW-r8-dyB" customClass="EmbeddedScrollViewController" customModule="SW4Temp" customModuleProvider="target" sceneMemberID="viewController">
                    <view key="view" contentMode="scaleToFill" id="Mgr-6N-2U6">
                        <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="K2x-mz-KcZ" userLabel="V-Scroll">
                                <rect key="frame" x="0.0" y="20" width="375" height="647"/>
                                <subviews>
                                    <scrollView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="Dcg-9m-tlK" userLabel="H-Scroll">
                                        <rect key="frame" x="0.0" y="0.0" width="375" height="390"/>
                                        <subviews>
                                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Upper Left" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="unz-8T-JcR">
                                                <rect key="frame" x="20" y="20" width="82" height="21"/>
                                                <color key="backgroundColor" red="0.45138680930000002" green="0.99309605359999997" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                                <nil key="textColor"/>
                                                <nil key="highlightedColor"/>
                                            </label>
                                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Lower Right" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="Cdr-yN-9YB">
                                                <rect key="frame" x="500" y="330" width="90.5" height="21"/>
                                                <color key="backgroundColor" red="0.45138680930000002" green="0.99309605359999997" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                                <nil key="textColor"/>
                                                <nil key="highlightedColor"/>
                                            </label>
                                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" textAlignment="natural" lineBreakMode="tailTruncation" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="qsY-aV-AFa" userLabel="InfoLabel">
                                                <rect key="frame" x="20" y="281" width="320" height="41"/>
                                                <color key="backgroundColor" red="0.45138680930000002" green="0.99309605359999997" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                                <constraints>
                                                    <constraint firstAttribute="width" constant="320" id="g2L-p3-Nt5"/>
                                                </constraints>
                                                <string key="text">To demonstrate Horizontal scrolling,
There is Another Label to the Right ---&gt;</string>
                                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                                <nil key="textColor"/>
                                                <nil key="highlightedColor"/>
                                            </label>
                                        </subviews>
                                        <color key="backgroundColor" red="0.45009386540000001" green="0.98132258650000004" blue="0.4743030667" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                        <constraints>
                                            <constraint firstAttribute="height" constant="390" id="2ln-JF-25C"/>
                                            <constraint firstAttribute="bottom" secondItem="Cdr-yN-9YB" secondAttribute="bottom" constant="20" id="C6t-Uu-DXN"/>
                                            <constraint firstItem="Cdr-yN-9YB" firstAttribute="top" secondItem="qsY-aV-AFa" secondAttribute="bottom" constant="8" id="GfU-jw-KzP"/>
                                            <constraint firstItem="Cdr-yN-9YB" firstAttribute="leading" secondItem="qsY-aV-AFa" secondAttribute="trailing" constant="160" id="Q4e-Fl-IEg"/>
                                            <constraint firstAttribute="trailing" secondItem="Cdr-yN-9YB" secondAttribute="trailing" constant="20" id="X5C-nj-47A"/>
                                            <constraint firstItem="unz-8T-JcR" firstAttribute="leading" secondItem="Dcg-9m-tlK" secondAttribute="leading" constant="20" id="cVG-kM-8ZI"/>
                                            <constraint firstItem="qsY-aV-AFa" firstAttribute="leading" secondItem="unz-8T-JcR" secondAttribute="leading" id="pPP-Ko-du2"/>
                                            <constraint firstItem="qsY-aV-AFa" firstAttribute="top" secondItem="unz-8T-JcR" secondAttribute="bottom" constant="240" id="tMx-HW-l2L"/>
                                            <constraint firstItem="unz-8T-JcR" firstAttribute="top" secondItem="Dcg-9m-tlK" secondAttribute="top" constant="20" id="ybo-xk-6LG"/>
                                        </constraints>
                                    </scrollView>
                                    <pageControl opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" numberOfPages="3" translatesAutoresizingMaskIntoConstraints="NO" id="B7V-nL-rCv">
                                        <rect key="frame" x="121.5" y="353" width="132" height="37"/>
                                        <color key="backgroundColor" red="0.4756349325" green="0.47564673419999998" blue="0.47564041610000002" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                        <constraints>
                                            <constraint firstAttribute="width" constant="132" id="2ge-VP-yzz"/>
                                        </constraints>
                                    </pageControl>
                                    <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="3cl-Ou-kTu">
                                        <rect key="frame" x="10" y="405" width="40" height="40"/>
                                        <color key="backgroundColor" red="0.0" green="0.58980089430000004" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                        <constraints>
                                            <constraint firstAttribute="width" constant="40" id="E0D-Ed-vVX"/>
                                            <constraint firstAttribute="height" constant="40" id="MFN-Ap-lkV"/>
                                        </constraints>
                                    </imageView>
                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="This Title" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="1Sf-bC-0yM">
                                        <rect key="frame" x="58" y="415" width="70" height="21"/>
                                        <color key="backgroundColor" red="0.92143100499999997" green="0.92145264149999995" blue="0.92144101860000005" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                        <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                        <nil key="textColor"/>
                                        <nil key="highlightedColor"/>
                                    </label>
                                    <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Description Label" textAlignment="natural" lineBreakMode="tailTruncation" numberOfLines="0" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="MkP-AG-X03">
                                        <rect key="frame" x="10" y="461" width="355" height="20.5"/>
                                        <color key="backgroundColor" red="1" green="0.83234566450000003" blue="0.47320586440000001" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                        <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                        <nil key="textColor"/>
                                        <nil key="highlightedColor"/>
                                    </label>
                                </subviews>
                                <color key="backgroundColor" red="0.99953407049999998" green="0.98835557699999999" blue="0.47265523669999998" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                <constraints>
                                    <constraint firstAttribute="bottom" secondItem="MkP-AG-X03" secondAttribute="bottom" constant="8" id="62d-uw-l6l"/>
                                    <constraint firstItem="B7V-nL-rCv" firstAttribute="centerX" secondItem="Dcg-9m-tlK" secondAttribute="centerX" id="6TH-qD-Rpg"/>
                                    <constraint firstItem="Dcg-9m-tlK" firstAttribute="leading" secondItem="K2x-mz-KcZ" secondAttribute="leading" id="8Cm-Zq-jKu"/>
                                    <constraint firstItem="1Sf-bC-0yM" firstAttribute="centerY" secondItem="3cl-Ou-kTu" secondAttribute="centerY" id="D54-Jk-1zW"/>
                                    <constraint firstItem="MkP-AG-X03" firstAttribute="width" secondItem="K2x-mz-KcZ" secondAttribute="width" constant="-20" id="Sk8-fq-0I8"/>
                                    <constraint firstItem="3cl-Ou-kTu" firstAttribute="top" secondItem="Dcg-9m-tlK" secondAttribute="bottom" constant="15" id="XN2-Lz-nQQ"/>
                                    <constraint firstAttribute="trailing" secondItem="Dcg-9m-tlK" secondAttribute="trailing" id="YtO-y4-qn9"/>
                                    <constraint firstItem="MkP-AG-X03" firstAttribute="leading" secondItem="3cl-Ou-kTu" secondAttribute="leading" id="ZM0-3U-XLQ"/>
                                    <constraint firstItem="Dcg-9m-tlK" firstAttribute="top" secondItem="K2x-mz-KcZ" secondAttribute="top" id="fxa-1i-NHa"/>
                                    <constraint firstItem="Dcg-9m-tlK" firstAttribute="width" secondItem="K2x-mz-KcZ" secondAttribute="width" id="l7O-qV-Ja9"/>
                                    <constraint firstItem="3cl-Ou-kTu" firstAttribute="leading" secondItem="K2x-mz-KcZ" secondAttribute="leading" constant="10" id="on9-FW-ZiG"/>
                                    <constraint firstItem="B7V-nL-rCv" firstAttribute="bottom" secondItem="Dcg-9m-tlK" secondAttribute="bottom" id="tbv-ao-adS"/>
                                    <constraint firstItem="1Sf-bC-0yM" firstAttribute="leading" secondItem="3cl-Ou-kTu" secondAttribute="trailing" constant="8" id="wuV-fj-HFV"/>
                                    <constraint firstItem="MkP-AG-X03" firstAttribute="top" secondItem="3cl-Ou-kTu" secondAttribute="bottom" constant="16" id="x4z-IQ-o2z"/>
                                </constraints>
                            </scrollView>
                        </subviews>
                        <color key="backgroundColor" red="1" green="0.1857388616" blue="0.57339501380000002" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                        <constraints>
                            <constraint firstItem="MMC-8B-qcF" firstAttribute="trailing" secondItem="K2x-mz-KcZ" secondAttribute="trailing" id="3S9-mL-Ldn"/>
                            <constraint firstItem="MMC-8B-qcF" firstAttribute="bottom" secondItem="K2x-mz-KcZ" secondAttribute="bottom" id="7g2-ph-w0I"/>
                            <constraint firstItem="K2x-mz-KcZ" firstAttribute="top" secondItem="MMC-8B-qcF" secondAttribute="top" id="PIT-lg-Z3r"/>
                            <constraint firstItem="K2x-mz-KcZ" firstAttribute="leading" secondItem="MMC-8B-qcF" secondAttribute="leading" id="irI-yU-v4c"/>
                        </constraints>
                        <viewLayoutGuide key="safeArea" id="MMC-8B-qcF"/>
                    </view>
                    <connections>
                        <outlet property="descriptionLabel" destination="MkP-AG-X03" id="4xr-iw-3tF"/>
                    </connections>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="gbQ-wO-etq" userLabel="First Responder" sceneMemberID="firstResponder"/>
            </objects>
            <point key="canvasLocation" x="41" y="2257"/>
        </scene>
    </scenes>
</document>

关于ios - 如何同时使用水平和垂直 ScrollView (快速)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53504212/

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