我有这样的观点，我根本无法正确地理解约束。我什至尝试了堆栈视图，但仍然无法获得它。请点击图片链接查看布局。
我需要帮助在情节提要中设置正确的约束并确保它是动态的（包括缩小到屏幕大小的文本）。感谢您的帮助！
【问题讨论】：
标签： ios swift uibutton constraints
我编辑了你的故事板。在这里我粘贴了 xml。取出第一个顶部按钮宽度和高度约束的出口。然后通过代码更改动态行为。
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *buttonWidthConstraint;
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *buttonHeightConstant;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
//60 = gap between button and left right padding
//140 = gap between buttons and top bottom padding
self.buttonWidthConstraint.constant = (self.view.frame.size.width - 60)/2;
self.buttonHeightConstant.constant = (self.view.frame.size.height - 140)/4;
[UIView animateWithDuration:0.5 animations:^{
[self.view layoutIfNeeded];
}];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8191" systemVersion="14F27" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="JGf-ti-vAF">
<dependencies>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8154"/>
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="YlR-y8-Jbu">
<objects>
<viewController id="JGf-ti-vAF" customClass="ViewController" sceneMemberID="viewController">
<layoutGuides>
<viewControllerLayoutGuide type="top" id="Abf-DD-SvM"/>
<viewControllerLayoutGuide type="bottom" id="j19-ef-uDb"/>
</layoutGuides>
<view key="view" contentMode="scaleToFill" id="qIt-ah-XBl">
<rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="7Cn-GC-UIA">
<rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
</imageView>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="wordWrap" translatesAutoresizingMaskIntoConstraints="NO" id="aHp-jP-RgJ">
<rect key="frame" x="226" y="45" width="148" height="101"/>
<color key="backgroundColor" red="1" green="0.087589855729999999" blue="0.067484365290000001" alpha="1" colorSpace="calibratedRGB"/>
<constraints>
<constraint firstAttribute="width" constant="148" id="emB-rW-56o"/>
<constraint firstAttribute="height" constant="101" id="g0F-rb-AVX"/>
</constraints>
<fontDescription key="fontDescription" name="Avenir-Book" family="Avenir" pointSize="18"/>
<state key="normal" title="Button one">
<color key="titleColor" red="1" green="1" blue="1" alpha="1" colorSpace="calibratedRGB"/>
</state>
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="number" keyPath="layer.cornerRadius">
<real key="value" value="8.5"/>
</userDefinedRuntimeAttribute>
</userDefinedRuntimeAttributes>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="wordWrap" translatesAutoresizingMaskIntoConstraints="NO" id="8Rm-YT-wZ7">
<rect key="frame" x="20" y="166" width="148" height="101"/>
<color key="backgroundColor" red="1" green="0.087589855729999999" blue="0.067484365290000001" alpha="1" colorSpace="calibratedRGB"/>
<fontDescription key="fontDescription" name="Avenir-Book" family="Avenir" pointSize="18"/>
<state key="normal" title="Button one">
<color key="titleColor" red="1" green="1" blue="1" alpha="1" colorSpace="calibratedRGB"/>
</state>
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="number" keyPath="layer.cornerRadius">
<real key="value" value="8.5"/>
</userDefinedRuntimeAttribute>
</userDefinedRuntimeAttributes>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="wordWrap" translatesAutoresizingMaskIntoConstraints="NO" id="T5I-DX-agA">
<rect key="frame" x="432" y="166" width="148" height="101"/>
<color key="backgroundColor" red="1" green="0.087589855729999999" blue="0.067484365290000001" alpha="1" colorSpace="calibratedRGB"/>
<fontDescription key="fontDescription" name="Avenir-Book" family="Avenir" pointSize="18"/>
<state key="normal" title="Button one">
<color key="titleColor" red="1" green="1" blue="1" alpha="1" colorSpace="calibratedRGB"/>
</state>
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="number" keyPath="layer.cornerRadius">
<real key="value" value="8.5"/>
</userDefinedRuntimeAttribute>
</userDefinedRuntimeAttributes>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="wordWrap" translatesAutoresizingMaskIntoConstraints="NO" id="Its-1I-c8f">
<rect key="frame" x="432" y="287" width="148" height="101"/>
<color key="backgroundColor" red="1" green="0.087589855729999999" blue="0.067484365290000001" alpha="1" colorSpace="calibratedRGB"/>
<fontDescription key="fontDescription" name="Avenir-Book" family="Avenir" pointSize="18"/>
<state key="normal" title="Button one">
<color key="titleColor" red="1" green="1" blue="1" alpha="1" colorSpace="calibratedRGB"/>
</state>
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="number" keyPath="layer.cornerRadius">
<real key="value" value="8.5"/>
</userDefinedRuntimeAttribute>
</userDefinedRuntimeAttributes>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="wordWrap" translatesAutoresizingMaskIntoConstraints="NO" id="Wxo-Rh-KVV">
<rect key="frame" x="20" y="408" width="148" height="101"/>
<color key="backgroundColor" red="1" green="0.087589855729999999" blue="0.067484365290000001" alpha="1" colorSpace="calibratedRGB"/>
<fontDescription key="fontDescription" name="Avenir-Book" family="Avenir" pointSize="18"/>
<state key="normal" title="Button one">
<color key="titleColor" red="1" green="1" blue="1" alpha="1" colorSpace="calibratedRGB"/>
</state>
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="number" keyPath="layer.cornerRadius">
<real key="value" value="8.5"/>
</userDefinedRuntimeAttribute>
</userDefinedRuntimeAttributes>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="wordWrap" translatesAutoresizingMaskIntoConstraints="NO" id="UDX-S2-uRA">
<rect key="frame" x="432" y="408" width="148" height="101"/>
<color key="backgroundColor" red="1" green="0.087589855729999999" blue="0.067484365290000001" alpha="1" colorSpace="calibratedRGB"/>
<fontDescription key="fontDescription" name="Avenir-Book" family="Avenir" pointSize="18"/>
<state key="normal" title="Button one">
<color key="titleColor" red="1" green="1" blue="1" alpha="1" colorSpace="calibratedRGB"/>
</state>
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="number" keyPath="layer.cornerRadius">
<real key="value" value="8.5"/>
</userDefinedRuntimeAttribute>
</userDefinedRuntimeAttributes>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="wordWrap" translatesAutoresizingMaskIntoConstraints="NO" id="t2m-9Y-3Gr">
<rect key="frame" x="20" y="287" width="148" height="101"/>
<color key="backgroundColor" red="1" green="0.087589855729999999" blue="0.067484365290000001" alpha="1" colorSpace="calibratedRGB"/>
<fontDescription key="fontDescription" name="Avenir-Book" family="Avenir" pointSize="18"/>
<state key="normal" title="Button one">
<color key="titleColor" red="1" green="1" blue="1" alpha="1" colorSpace="calibratedRGB"/>
</state>
<userDefinedRuntimeAttributes>
<userDefinedRuntimeAttribute type="number" keyPath="layer.cornerRadius">
<real key="value" value="8.5"/>
</userDefinedRuntimeAttribute>
</userDefinedRuntimeAttributes>
</button>
</subviews>
<color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
<constraints>
<constraint firstItem="Wxo-Rh-KVV" firstAttribute="leading" secondItem="t2m-9Y-3Gr" secondAttribute="leading" id="180-eR-Wwt"/>
<constraint firstAttribute="trailing" secondItem="7Cn-GC-UIA" secondAttribute="trailing" id="5nC-Gx-Fa1"/>
<constraint firstItem="aHp-jP-RgJ" firstAttribute="width" secondItem="T5I-DX-agA" secondAttribute="width" id="BY2-aC-Yd3"/>
<constraint firstItem="Wxo-Rh-KVV" firstAttribute="top" secondItem="UDX-S2-uRA" secondAttribute="top" id="CuU-5v-5rN"/>
<constraint firstItem="UDX-S2-uRA" firstAttribute="leading" secondItem="Its-1I-c8f" secondAttribute="leading" id="DlE-Nf-3io"/>
<constraint firstItem="j19-ef-uDb" firstAttribute="top" secondItem="7Cn-GC-UIA" secondAttribute="bottom" id="Fbp-KG-e6q"/>
<constraint firstItem="7Cn-GC-UIA" firstAttribute="leading" secondItem="qIt-ah-XBl" secondAttribute="leading" id="Jr4-7g-Upm"/>
<constraint firstItem="aHp-jP-RgJ" firstAttribute="centerX" secondItem="qIt-ah-XBl" secondAttribute="centerX" id="M5Z-AL-SGA"/>
<constraint firstItem="t2m-9Y-3Gr" firstAttribute="leading" secondItem="8Rm-YT-wZ7" secondAttribute="leading" id="NBt-0c-Fv9"/>
<constraint firstItem="aHp-jP-RgJ" firstAttribute="top" secondItem="Abf-DD-SvM" secondAttribute="bottom" constant="25" id="NqB-Cg-7cN"/>
<constraint firstItem="t2m-9Y-3Gr" firstAttribute="top" secondItem="8Rm-YT-wZ7" secondAttribute="bottom" constant="20" id="Q76-UZ-V5H"/>
<constraint firstItem="aHp-jP-RgJ" firstAttribute="height" secondItem="T5I-DX-agA" secondAttribute="height" id="T9R-Ug-Bub"/>
<constraint firstItem="aHp-jP-RgJ" firstAttribute="height" secondItem="8Rm-YT-wZ7" secondAttribute="height" id="UNQ-d0-l4z"/>
<constraint firstItem="t2m-9Y-3Gr" firstAttribute="height" secondItem="aHp-jP-RgJ" secondAttribute="height" id="Zer-FI-bBB"/>
<constraint firstItem="UDX-S2-uRA" firstAttribute="height" secondItem="aHp-jP-RgJ" secondAttribute="height" id="c56-IW-gRF"/>
<constraint firstAttribute="trailing" secondItem="T5I-DX-agA" secondAttribute="trailing" constant="20" id="dXU-Gh-eXL"/>
<constraint firstItem="t2m-9Y-3Gr" firstAttribute="width" secondItem="aHp-jP-RgJ" secondAttribute="width" id="e14-04-CG0"/>
<constraint firstItem="Wxo-Rh-KVV" firstAttribute="height" secondItem="aHp-jP-RgJ" secondAttribute="height" id="fiF-yH-qvW"/>
<constraint firstItem="Wxo-Rh-KVV" firstAttribute="width" secondItem="aHp-jP-RgJ" secondAttribute="width" id="jc3-oJ-ze2"/>
<constraint firstItem="UDX-S2-uRA" firstAttribute="width" secondItem="aHp-jP-RgJ" secondAttribute="width" id="kNm-AX-HVB"/>
<constraint firstItem="aHp-jP-RgJ" firstAttribute="width" secondItem="8Rm-YT-wZ7" secondAttribute="width" id="kRf-PB-mDD"/>
<constraint firstItem="t2m-9Y-3Gr" firstAttribute="top" secondItem="Its-1I-c8f" secondAttribute="top" id="kTF-qT-xAw"/>
<constraint firstItem="8Rm-YT-wZ7" firstAttribute="top" secondItem="T5I-DX-agA" secondAttribute="top" id="mbc-xn-Fgi"/>
<constraint firstItem="Its-1I-c8f" firstAttribute="height" secondItem="aHp-jP-RgJ" secondAttribute="height" id="ogn-ja-iwo"/>
<constraint firstItem="8Rm-YT-wZ7" firstAttribute="leading" secondItem="qIt-ah-XBl" secondAttribute="leading" constant="20" id="riZ-Om-LeS"/>
<constraint firstItem="Its-1I-c8f" firstAttribute="width" secondItem="aHp-jP-RgJ" secondAttribute="width" id="s0k-AT-xQk"/>
<constraint firstItem="8Rm-YT-wZ7" firstAttribute="top" secondItem="aHp-jP-RgJ" secondAttribute="bottom" constant="20" id="u62-4u-etC"/>
<constraint firstItem="8Rm-YT-wZ7" firstAttribute="height" secondItem="T5I-DX-agA" secondAttribute="height" id="vid-B6-03f"/>
<constraint firstItem="8Rm-YT-wZ7" firstAttribute="width" secondItem="T5I-DX-agA" secondAttribute="width" id="w0d-EC-Erp"/>
<constraint firstItem="7Cn-GC-UIA" firstAttribute="top" secondItem="qIt-ah-XBl" secondAttribute="top" id="wy5-7A-SfF"/>
<constraint firstItem="Wxo-Rh-KVV" firstAttribute="top" secondItem="t2m-9Y-3Gr" secondAttribute="bottom" constant="20" id="x0A-hz-o8i"/>
<constraint firstItem="Its-1I-c8f" firstAttribute="leading" secondItem="T5I-DX-agA" secondAttribute="leading" id="xwQ-c1-xDh"/>
</constraints>
<variation key="default">
<mask key="constraints">
<exclude reference="vid-B6-03f"/>
<exclude reference="w0d-EC-Erp"/>
</mask>
</variation>
</view>
<connections>
<outlet property="buttonHeightConstant" destination="g0F-rb-AVX" id="7fh-Sc-ymq"/>
<outlet property="buttonWidthConstraint" destination="emB-rW-56o" id="Lil-Fv-rOV"/>
</connections>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="bSl-KE-cTH" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="3" y="179"/>
</scene>
</scenes>
</document>
【讨论】：
所以你有七个按钮：
您显然希望顶部按钮单独排成一排，其余按钮排成三排，每排两个。所以我选择顶部的两个并排按钮，然后单击画布底部的“嵌入堆栈视图”按钮。
因为我已经手动将两个按钮放置在水平行中，Xcode 自动将它们放置在水平堆栈视图中。
我对另外两排两个按钮重复该过程。它最终看起来像这样：
然后我选择顶部的独立按钮和三个水平堆栈视图，然后再次点击“嵌入堆栈视图”按钮。这一次，Xcode 创建了一个垂直堆栈视图，它看起来像这样：
由于您希望顶部按钮居中，因此我在属性检查器中将垂直堆栈视图的对齐方式设置为居中：
我猜你希望整个排列居中，所以我在垂直堆栈视图上创建约束，使其在其容器中水平和垂直居中：
您还需要按钮之间的填充，因此我选择所有堆栈视图并在属性检查器中设置填充：
您没有解释如何选择按钮的大小。我将选择顶部按钮并将其限制为 100 x 60：
然后我将选择文档大纲中的所有按钮并将它们限制为相等的宽度和高度：
当我这样做时，Xcode 使垂直堆栈视图偏离中心，但我只是在文档大纲中选择它，然后选择编辑器 > 解决自动布局问题 >（所有视图）更新帧来修复错位。最后看起来是这样的：
【讨论】：