我有一个垂直堆栈视图，将前导，顶部和尾部对齐到安全区域，因此它具有最大宽度。
其中包含另一个垂直堆栈视图，该视图具有到其superview 30的尾随和前导空间，并且包含（仅）两个非常相似的水平堆栈视图。
两者都没有额外的约束，间距为30
第一个包含三个图像，所有图像仅具有约1：1的约束比率，并且图像源也是二次的。它们设置为宽高比，并具有运行时属性layer.borderWidth: 1。
要将白色圆圈作为边框，我为第一个水平堆栈视图创建了一个插座，并调用：
let white = UIColor(white:1, alpha:1).cgColor
for v in imageStackView.subviews {
v.layer.borderColor = white
v.layer.cornerRadius = (v.layer.bounds.size.width/2)
v.layer.masksToBounds = true
}
在我的func viewDidLoad()中。编辑：建议我将其移至viewDidLayoutSubviews()
当我启动应用程序时，我会得到圆角，但没有完整的圆圈。我发现这种方法可以在线获得一个圆圈，它曾经适合我。这次我做错了什么？
这是我完整的场景：
<scene sceneID="l8R-Sc-Iim">
<objects>
<viewController id="glE-1m-7jE" customClass="MenuViewController" customModule="MyProjekt" customModuleProvider="target" sceneMemberID="viewController">
<view key="view" contentMode="scaleToFill" id="wz6-0R-OiW">
<rect key="frame" x="0.0" y="0.0" width="320" height="568"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<stackView opaque="NO" contentMode="scaleToFill" axis="vertical" alignment="center" spacing="30" translatesAutoresizingMaskIntoConstraints="NO" id="ZNX-E4-fJI">
<rect key="frame" x="0.0" y="20" width="320" height="278.5"/>
<subviews>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Titel" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="uJa-bI-tyq">
<rect key="frame" x="63" y="0.0" width="194.5" height="20.5"/>
<fontDescription key="fontDescription" type="system" pointSize="17"/>
<color key="textColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
<nil key="highlightedColor"/>
</label>
<imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="auto" translatesAutoresizingMaskIntoConstraints="NO" id="TUi-ah-W5J">
<rect key="frame" x="0.0" y="50.5" width="320" height="100.5"/>
<constraints>
<constraint firstAttribute="width" secondItem="TUi-ah-W5J" secondAttribute="height" multiplier="1946:613" id="9o7-vb-64J"/>
</constraints>
</imageView>
<stackView opaque="NO" contentMode="scaleToFill" axis="vertical" spacing="10" translatesAutoresizingMaskIntoConstraints="NO" id="CK2-GV-eAN">
<rect key="frame" x="30" y="181" width="260" height="97.5"/>
<subviews>
<stackView opaque="NO" contentMode="scaleToFill" distribution="fillEqually" spacing="30" translatesAutoresizingMaskIntoConstraints="NO" id="4ag-dE-MkJ">
<rect key="frame" x="0.0" y="0.0" width="260" height="67"/>
<subviews>
<imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="sonne" translatesAutoresizingMaskIntoConstraints="NO" id="rKB-oI-ZlW">
<rect key="frame" x="0.0" y="0.0" width="66.5" height="67"/>
<gestureRecognizers/>
<constraints>
<constraint firstAttribute="width" secondItem="rKB-oI-ZlW" secondAttribute="height" multiplier="1:1" id="Yjh-dy-ha5"/>
</constraints>
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="number" keyPath="layer.BorderWidth">
<integer key="value" value="1"/>
</userDefinedRuntimeAttribute>
<userDefinedRuntimeAttribute type="boolean" keyPath="userInteractionEnabled" value="YES"/>
</userDefinedRuntimeAttributes>
<connections>
<outletCollection property="gestureRecognizers" destination="JyJ-E7-IQF" appends="YES" id="Z9S-0C-Vb1"/>
</connections>
</imageView>
<imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="schnee" translatesAutoresizingMaskIntoConstraints="NO" id="TNu-EP-zpf">
<rect key="frame" x="96.5" y="0.0" width="67" height="67"/>
<gestureRecognizers/>
<constraints>
<constraint firstAttribute="width" secondItem="TNu-EP-zpf" secondAttribute="height" multiplier="1:1" id="uWO-vX-Y9D"/>
</constraints>
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="number" keyPath="layer.borderWidth">
<integer key="value" value="1"/>
</userDefinedRuntimeAttribute>
</userDefinedRuntimeAttributes>
</imageView>
<imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="sonne schnee" translatesAutoresizingMaskIntoConstraints="NO" id="SLM-td-gnU">
<rect key="frame" x="193.5" y="0.0" width="66.5" height="67"/>
<gestureRecognizers/>
<constraints>
<constraint firstAttribute="width" secondItem="SLM-td-gnU" secondAttribute="height" multiplier="1:1" id="1RH-Xt-phM"/>
</constraints>
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="number" keyPath="layer.borderWidth">
<integer key="value" value="1"/>
</userDefinedRuntimeAttribute>
</userDefinedRuntimeAttributes>
</imageView>
</subviews>
</stackView>
<stackView opaque="NO" contentMode="scaleToFill" distribution="fillEqually" spacing="20" translatesAutoresizingMaskIntoConstraints="NO" id="1GK-qd-V3k">
<rect key="frame" x="0.0" y="77" width="260" height="20.5"/>
<subviews>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Text1" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontForContentSizeCategory="YES" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="eWU-mM-aQq">
<rect key="frame" x="0.0" y="0.0" width="73.5" height="20.5"/>
<fontDescription key="fontDescription" type="system" pointSize="17"/>
<color key="textColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
<nil key="highlightedColor"/>
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="boolean" keyPath="adjustsFontSizeToFitWidth" value="YES"/>
</userDefinedRuntimeAttributes>
</label>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Text2" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontForContentSizeCategory="YES" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="wyW-jR-92l">
<rect key="frame" x="93.5" y="0.0" width="73" height="20.5"/>
<fontDescription key="fontDescription" type="system" pointSize="17"/>
<color key="textColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
<nil key="highlightedColor"/>
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="boolean" keyPath="adjustsFontSizeToFitWidth" value="YES"/>
</userDefinedRuntimeAttributes>
</label>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Text3" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontForContentSizeCategory="YES" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="xU9-ez-ESX">
<rect key="frame" x="186.5" y="0.0" width="73.5" height="20.5"/>
<fontDescription key="fontDescription" type="system" pointSize="11"/>
<color key="textColor" white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
<nil key="highlightedColor"/>
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="boolean" keyPath="adjustsFontSizeToFitWidth" value="YES"/>
</userDefinedRuntimeAttributes>
</label>
</subviews>
</stackView>
</subviews>
<color key="backgroundColor" red="0.17254901959999999" green="0.1843137255" blue="0.21960784310000001" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
</stackView>
</subviews>
<constraints>
<constraint firstItem="CK2-GV-eAN" firstAttribute="leading" secondItem="ZNX-E4-fJI" secondAttribute="leading" constant="30" id="Rao-NT-glY"/>
<constraint firstAttribute="trailing" secondItem="CK2-GV-eAN" secondAttribute="trailing" constant="30" id="pcQ-0c-3S0"/>
</constraints>
</stackView>
</subviews>
<color key="backgroundColor" name="BackGroundColor"/>
<constraints>
<constraint firstItem="ZNX-E4-fJI" firstAttribute="top" secondItem="g2X-8E-oXv" secondAttribute="top" id="UcU-d5-McW"/>
<constraint firstItem="ZNX-E4-fJI" firstAttribute="leading" secondItem="g2X-8E-oXv" secondAttribute="leading" id="vTj-Mg-hRR"/>
<constraint firstAttribute="trailing" secondItem="ZNX-E4-fJI" secondAttribute="trailing" id="xoI-wD-OZz"/>
</constraints>
<viewLayoutGuide key="safeArea" id="g2X-8E-oXv"/>
</view>
<connections>
<outlet property="imgbtnContainer" destination="4ag-dE-MkJ" id="4Lu-zC-X56"/>
<outlet property="sommerImage" destination="rKB-oI-ZlW" id="9vz-9A-XjX"/>
<outlet property="titleLabel" destination="uJa-bI-tyq" id="xl7-VX-CR4"/>
</connections>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="75A-bF-ATY" userLabel="First Responder" sceneMemberID="firstResponder"/>
<tapGestureRecognizer id="JyJ-E7-IQF">
<connections>
<segue destination="AeH-xq-It1" kind="presentation" id="tXW-Ch-LPs"/>
</connections>
</tapGestureRecognizer>
</objects>
<point key="canvasLocation" x="1759" y="117"/>
</scene>
答案 0 :(得分：1)
执行此代码时，您的视图很可能没有列出。您应该在image中运行舍入代码：
viewDidLayoutSubviews