如何启用 UITableViewCell 中的 UICollection View 的水平滚动？
How to enable horizontal scroll of UICollection View that is within a UITableViewCell?
我有一个 UICollectionView 放在 UITableViewCell 里面。集合视图的滚动方向设置为水平。但是，当我在其上向左或向右滑动以尝试滚动时，它不起作用。而只是按下 table 视图单元格。似乎 table 视图正在吞噬手势并且不允许集合视图注册它。
我怎样才能使集合视图可以通过水平滑动左右滚动，同时仍然允许父 table 视图垂直滚动？
我经历了 and its accepted answer's linked blog post, but it did not seem to address the issue I am having. On a whim, I also tried throwing sendSubviewToBack(self.contentView) in my table view cell's awakeFromNib() based on this question，但它似乎没有做任何事情。
不看你的项目很难知道...
这里是尽可能基本的设置。
- Table 视图控制器
- 单元格原型和class带有“行标签”和集合视图
- 集合视图原型和class
故事板来源：
<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="19529" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="Ets-ss-TQd">
<device id="retina3_5" orientation="portrait" appearance="light"/>
<dependencies>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="19519"/>
<capability name="System colors in document resources" minToolsVersion="11.0"/>
<capability name="collection view cell content view" minToolsVersion="11.0"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--Table Col Table View Controller-->
<scene sceneID="6jQ-dU-swf">
<objects>
<tableViewController id="Ets-ss-TQd" customClass="TableColTableViewController" customModule="MoreScratch" customModuleProvider="target" sceneMemberID="viewController">
<tableView key="view" clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="-1" estimatedSectionHeaderHeight="-1" sectionFooterHeight="-1" estimatedSectionFooterHeight="-1" id="zYt-i6-X2h">
<rect key="frame" x="0.0" y="0.0" width="320" height="480"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<color key="backgroundColor" systemColor="systemBackgroundColor"/>
<prototypes>
<tableViewCell clipsSubviews="YES" contentMode="scaleToFill" preservesSuperviewLayoutMargins="YES" selectionStyle="default" indentationWidth="10" reuseIdentifier="someTableCell" rowHeight="125" id="B1r-57-a4y" customClass="SomeTableCell" customModule="MoreScratch" customModuleProvider="target">
<rect key="frame" x="0.0" y="44.5" width="320" height="125"/>
<autoresizingMask key="autoresizingMask"/>
<tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" preservesSuperviewLayoutMargins="YES" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="B1r-57-a4y" id="Zyt-9U-dTe">
<rect key="frame" x="0.0" y="0.0" width="320" height="125"/>
<autoresizingMask key="autoresizingMask"/>
<subviews>
<collectionView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" dataMode="prototypes" translatesAutoresizingMaskIntoConstraints="NO" id="d9m-rN-Eyd">
<rect key="frame" x="16" y="54" width="288" height="60"/>
<color key="backgroundColor" red="1" green="0.83234566450000003" blue="0.47320586440000001" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
<constraints>
<constraint firstAttribute="height" constant="60" id="E26-bE-U5T"/>
</constraints>
<collectionViewFlowLayout key="collectionViewLayout" scrollDirection="horizontal" minimumLineSpacing="10" minimumInteritemSpacing="4" id="mrH-RV-vqe">
<size key="itemSize" width="92" height="50"/>
<size key="headerReferenceSize" width="0.0" height="0.0"/>
<size key="footerReferenceSize" width="0.0" height="0.0"/>
<inset key="sectionInset" minX="0.0" minY="0.0" maxX="0.0" maxY="0.0"/>
</collectionViewFlowLayout>
<cells>
<collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" reuseIdentifier="someCollectionCell" id="JEj-s8-EVA" customClass="SomeCollectionCell" customModule="MoreScratch" customModuleProvider="target">
<rect key="frame" x="0.0" y="5" width="92" height="50"/>
<autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
<collectionViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO" id="mgI-0a-PJH">
<rect key="frame" x="0.0" y="0.0" width="92" height="50"/>
<autoresizingMask key="autoresizingMask"/>
<subviews>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="wJ1-UE-IvG">
<rect key="frame" x="8" y="8" width="76" height="34"/>
<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>
</subviews>
<constraints>
<constraint firstItem="wJ1-UE-IvG" firstAttribute="leading" secondItem="mgI-0a-PJH" secondAttribute="leadingMargin" id="7v0-S7-Kcb"/>
<constraint firstItem="wJ1-UE-IvG" firstAttribute="top" secondItem="mgI-0a-PJH" secondAttribute="topMargin" id="NUW-9U-OkK"/>
<constraint firstAttribute="bottomMargin" secondItem="wJ1-UE-IvG" secondAttribute="bottom" id="YXn-Qi-b3X"/>
<constraint firstAttribute="trailingMargin" secondItem="wJ1-UE-IvG" secondAttribute="trailing" id="ZNu-px-4Va"/>
</constraints>
</collectionViewCellContentView>
<connections>
<outlet property="label" destination="wJ1-UE-IvG" id="0fz-E6-bfF"/>
</connections>
</collectionViewCell>
</cells>
<connections>
<outlet property="dataSource" destination="B1r-57-a4y" id="hHd-RQ-xJb"/>
<outlet property="delegate" destination="B1r-57-a4y" id="3kW-TN-RKS"/>
</connections>
</collectionView>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Row Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="GpB-tj-mDa">
<rect key="frame" x="16" y="11" width="288" height="35"/>
<fontDescription key="fontDescription" type="system" pointSize="17"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
</subviews>
<constraints>
<constraint firstAttribute="trailingMargin" secondItem="d9m-rN-Eyd" secondAttribute="trailing" id="3Fd-ue-yEB"/>
<constraint firstAttribute="bottomMargin" secondItem="d9m-rN-Eyd" secondAttribute="bottom" priority="999" id="5EL-HQ-hli"/>
<constraint firstAttribute="trailingMargin" secondItem="GpB-tj-mDa" secondAttribute="trailing" id="UiZ-V8-tk0"/>
<constraint firstItem="d9m-rN-Eyd" firstAttribute="leading" secondItem="Zyt-9U-dTe" secondAttribute="leadingMargin" id="axO-Nr-EUG"/>
<constraint firstItem="GpB-tj-mDa" firstAttribute="leading" secondItem="Zyt-9U-dTe" secondAttribute="leadingMargin" id="hM3-MG-T66"/>
<constraint firstItem="d9m-rN-Eyd" firstAttribute="top" secondItem="GpB-tj-mDa" secondAttribute="bottom" constant="8" id="muE-Zg-mgg"/>
<constraint firstItem="GpB-tj-mDa" firstAttribute="top" secondItem="Zyt-9U-dTe" secondAttribute="topMargin" id="nea-19-Qvm"/>
</constraints>
</tableViewCellContentView>
<connections>
<outlet property="collectionView" destination="d9m-rN-Eyd" id="UOs-i9-xDd"/>
<outlet property="rowTitleLabel" destination="GpB-tj-mDa" id="LpD-4r-JgM"/>
</connections>
</tableViewCell>
</prototypes>
<connections>
<outlet property="dataSource" destination="Ets-ss-TQd" id="RC7-c1-RLO"/>
<outlet property="delegate" destination="Ets-ss-TQd" id="sLA-mZ-FSY"/>
</connections>
</tableView>
</tableViewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="435-nV-YGQ" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="125.625" y="225"/>
</scene>
</scenes>
<resources>
<systemColor name="systemBackgroundColor">
<color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
</systemColor>
</resources>
</document>
类:
import UIKit
struct SomeDataStruct {
var color: UIColor = .white
var num: Int = 0
}
class TableColTableViewController: UITableViewController {
var myData: [SomeDataStruct] = []
override func viewDidLoad() {
super.viewDidLoad()
let colors: [UIColor] = [
.systemRed, .systemGreen, .systemBlue, .cyan, .magenta, .yellow,
.red, .green, .blue, .orange, .brown, .purple,
]
let nums: [Int] = [
12, 15, 8, 21, 17, 14,
16, 10, 5, 13, 20, 19,
]
for (c, n) in zip(colors, nums) {
let d = SomeDataStruct(color: c, num: n)
myData.append(d)
}
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return myData.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "someTableCell", for: indexPath) as! SomeTableCell
cell.rowTitleLabel.text = "Row \(indexPath.row)"
cell.thisData = myData[indexPath.row]
return cell
}
}
class SomeTableCell: UITableViewCell {
@IBOutlet var rowTitleLabel: UILabel!
@IBOutlet var collectionView: UICollectionView!
var thisData: SomeDataStruct = SomeDataStruct() {
didSet {
collectionView.reloadData()
}
}
}
extension SomeTableCell: UICollectionViewDataSource, UICollectionViewDelegate {
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return thisData.num
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "someCollectionCell", for: indexPath) as! SomeCollectionCell
cell.label.text = "Cell \(indexPath.item)"
cell.contentView.backgroundColor = thisData.color
return cell
}
}
class SomeCollectionCell: UICollectionViewCell {
@IBOutlet var label: UILabel!
}
结果：
我有一个 UICollectionView 放在 UITableViewCell 里面。集合视图的滚动方向设置为水平。但是，当我在其上向左或向右滑动以尝试滚动时，它不起作用。而只是按下 table 视图单元格。似乎 table 视图正在吞噬手势并且不允许集合视图注册它。
我怎样才能使集合视图可以通过水平滑动左右滚动，同时仍然允许父 table 视图垂直滚动？
我经历了 sendSubviewToBack(self.contentView) in my table view cell's awakeFromNib() based on this question，但它似乎没有做任何事情。
不看你的项目很难知道...
这里是尽可能基本的设置。
- Table 视图控制器
- 单元格原型和class带有“行标签”和集合视图
- 集合视图原型和class
故事板来源：
<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="19529" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="Ets-ss-TQd">
<device id="retina3_5" orientation="portrait" appearance="light"/>
<dependencies>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="19519"/>
<capability name="System colors in document resources" minToolsVersion="11.0"/>
<capability name="collection view cell content view" minToolsVersion="11.0"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--Table Col Table View Controller-->
<scene sceneID="6jQ-dU-swf">
<objects>
<tableViewController id="Ets-ss-TQd" customClass="TableColTableViewController" customModule="MoreScratch" customModuleProvider="target" sceneMemberID="viewController">
<tableView key="view" clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="-1" estimatedRowHeight="-1" sectionHeaderHeight="-1" estimatedSectionHeaderHeight="-1" sectionFooterHeight="-1" estimatedSectionFooterHeight="-1" id="zYt-i6-X2h">
<rect key="frame" x="0.0" y="0.0" width="320" height="480"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<color key="backgroundColor" systemColor="systemBackgroundColor"/>
<prototypes>
<tableViewCell clipsSubviews="YES" contentMode="scaleToFill" preservesSuperviewLayoutMargins="YES" selectionStyle="default" indentationWidth="10" reuseIdentifier="someTableCell" rowHeight="125" id="B1r-57-a4y" customClass="SomeTableCell" customModule="MoreScratch" customModuleProvider="target">
<rect key="frame" x="0.0" y="44.5" width="320" height="125"/>
<autoresizingMask key="autoresizingMask"/>
<tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" preservesSuperviewLayoutMargins="YES" insetsLayoutMarginsFromSafeArea="NO" tableViewCell="B1r-57-a4y" id="Zyt-9U-dTe">
<rect key="frame" x="0.0" y="0.0" width="320" height="125"/>
<autoresizingMask key="autoresizingMask"/>
<subviews>
<collectionView clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" dataMode="prototypes" translatesAutoresizingMaskIntoConstraints="NO" id="d9m-rN-Eyd">
<rect key="frame" x="16" y="54" width="288" height="60"/>
<color key="backgroundColor" red="1" green="0.83234566450000003" blue="0.47320586440000001" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
<constraints>
<constraint firstAttribute="height" constant="60" id="E26-bE-U5T"/>
</constraints>
<collectionViewFlowLayout key="collectionViewLayout" scrollDirection="horizontal" minimumLineSpacing="10" minimumInteritemSpacing="4" id="mrH-RV-vqe">
<size key="itemSize" width="92" height="50"/>
<size key="headerReferenceSize" width="0.0" height="0.0"/>
<size key="footerReferenceSize" width="0.0" height="0.0"/>
<inset key="sectionInset" minX="0.0" minY="0.0" maxX="0.0" maxY="0.0"/>
</collectionViewFlowLayout>
<cells>
<collectionViewCell opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" reuseIdentifier="someCollectionCell" id="JEj-s8-EVA" customClass="SomeCollectionCell" customModule="MoreScratch" customModuleProvider="target">
<rect key="frame" x="0.0" y="5" width="92" height="50"/>
<autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
<collectionViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" insetsLayoutMarginsFromSafeArea="NO" id="mgI-0a-PJH">
<rect key="frame" x="0.0" y="0.0" width="92" height="50"/>
<autoresizingMask key="autoresizingMask"/>
<subviews>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="wJ1-UE-IvG">
<rect key="frame" x="8" y="8" width="76" height="34"/>
<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>
</subviews>
<constraints>
<constraint firstItem="wJ1-UE-IvG" firstAttribute="leading" secondItem="mgI-0a-PJH" secondAttribute="leadingMargin" id="7v0-S7-Kcb"/>
<constraint firstItem="wJ1-UE-IvG" firstAttribute="top" secondItem="mgI-0a-PJH" secondAttribute="topMargin" id="NUW-9U-OkK"/>
<constraint firstAttribute="bottomMargin" secondItem="wJ1-UE-IvG" secondAttribute="bottom" id="YXn-Qi-b3X"/>
<constraint firstAttribute="trailingMargin" secondItem="wJ1-UE-IvG" secondAttribute="trailing" id="ZNu-px-4Va"/>
</constraints>
</collectionViewCellContentView>
<connections>
<outlet property="label" destination="wJ1-UE-IvG" id="0fz-E6-bfF"/>
</connections>
</collectionViewCell>
</cells>
<connections>
<outlet property="dataSource" destination="B1r-57-a4y" id="hHd-RQ-xJb"/>
<outlet property="delegate" destination="B1r-57-a4y" id="3kW-TN-RKS"/>
</connections>
</collectionView>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Row Label" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="GpB-tj-mDa">
<rect key="frame" x="16" y="11" width="288" height="35"/>
<fontDescription key="fontDescription" type="system" pointSize="17"/>
<nil key="textColor"/>
<nil key="highlightedColor"/>
</label>
</subviews>
<constraints>
<constraint firstAttribute="trailingMargin" secondItem="d9m-rN-Eyd" secondAttribute="trailing" id="3Fd-ue-yEB"/>
<constraint firstAttribute="bottomMargin" secondItem="d9m-rN-Eyd" secondAttribute="bottom" priority="999" id="5EL-HQ-hli"/>
<constraint firstAttribute="trailingMargin" secondItem="GpB-tj-mDa" secondAttribute="trailing" id="UiZ-V8-tk0"/>
<constraint firstItem="d9m-rN-Eyd" firstAttribute="leading" secondItem="Zyt-9U-dTe" secondAttribute="leadingMargin" id="axO-Nr-EUG"/>
<constraint firstItem="GpB-tj-mDa" firstAttribute="leading" secondItem="Zyt-9U-dTe" secondAttribute="leadingMargin" id="hM3-MG-T66"/>
<constraint firstItem="d9m-rN-Eyd" firstAttribute="top" secondItem="GpB-tj-mDa" secondAttribute="bottom" constant="8" id="muE-Zg-mgg"/>
<constraint firstItem="GpB-tj-mDa" firstAttribute="top" secondItem="Zyt-9U-dTe" secondAttribute="topMargin" id="nea-19-Qvm"/>
</constraints>
</tableViewCellContentView>
<connections>
<outlet property="collectionView" destination="d9m-rN-Eyd" id="UOs-i9-xDd"/>
<outlet property="rowTitleLabel" destination="GpB-tj-mDa" id="LpD-4r-JgM"/>
</connections>
</tableViewCell>
</prototypes>
<connections>
<outlet property="dataSource" destination="Ets-ss-TQd" id="RC7-c1-RLO"/>
<outlet property="delegate" destination="Ets-ss-TQd" id="sLA-mZ-FSY"/>
</connections>
</tableView>
</tableViewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="435-nV-YGQ" userLabel="First Responder" customClass="UIResponder" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="125.625" y="225"/>
</scene>
</scenes>
<resources>
<systemColor name="systemBackgroundColor">
<color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
</systemColor>
</resources>
</document>
类:
import UIKit
struct SomeDataStruct {
var color: UIColor = .white
var num: Int = 0
}
class TableColTableViewController: UITableViewController {
var myData: [SomeDataStruct] = []
override func viewDidLoad() {
super.viewDidLoad()
let colors: [UIColor] = [
.systemRed, .systemGreen, .systemBlue, .cyan, .magenta, .yellow,
.red, .green, .blue, .orange, .brown, .purple,
]
let nums: [Int] = [
12, 15, 8, 21, 17, 14,
16, 10, 5, 13, 20, 19,
]
for (c, n) in zip(colors, nums) {
let d = SomeDataStruct(color: c, num: n)
myData.append(d)
}
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return myData.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "someTableCell", for: indexPath) as! SomeTableCell
cell.rowTitleLabel.text = "Row \(indexPath.row)"
cell.thisData = myData[indexPath.row]
return cell
}
}
class SomeTableCell: UITableViewCell {
@IBOutlet var rowTitleLabel: UILabel!
@IBOutlet var collectionView: UICollectionView!
var thisData: SomeDataStruct = SomeDataStruct() {
didSet {
collectionView.reloadData()
}
}
}
extension SomeTableCell: UICollectionViewDataSource, UICollectionViewDelegate {
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return thisData.num
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "someCollectionCell", for: indexPath) as! SomeCollectionCell
cell.label.text = "Cell \(indexPath.item)"
cell.contentView.backgroundColor = thisData.color
return cell
}
}
class SomeCollectionCell: UICollectionViewCell {
@IBOutlet var label: UILabel!
}
结果：