Swift - 使用网格（UICollectionView）进行流布局

一、网格UICollectionView最典型的例子是iBooks。其主要属性如下：

1，layout

该属性表示布局方式，有Flow、Custom两种布局方式。默认是Flow流式布局。

2，Accessories

是否显示页眉和页脚

3,各种尺寸属性

Cell Size：单元格尺寸

Header Size：页眉尺寸

Footer Size：页脚尺寸

Min Spacing：单元格之间间距

Section Insets：格分区上下左右空白区域大小。

二、流布局的简单样例

1，先创建一个ASimple View Application，删除默认的View Controller，拖入一个Collection
View Controller到界面上，这时我们可以看到已经同时添加了Collection View和Collection View
Cell控件。

2，勾选Collection View Controller属性面板里的Is Initial View Controller复选框，设置为启动视图控制器。

3，在Collection View Cell里拖入一个Image View和Label并摆放好位置和大小，用于显示图标和名称。

4，设置Image View的tag为1，Label的tag为2，Colletion View Cell的Identifier为DesignViewCell。

效果图如下：

 

--- ViewController.swift ---

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import UIKit   class ViewController: UICollectionViewController {           //课程名称和图片，每一门课程用字典来表示     let courses = [         ["name":"Swift","pic":"swift.png"],         ["name":"OC","pic":"oc.jpg"],         ["name":"java","pic":"java.png"],         ["name":"php","pic":"php.jpeg"]     ]           override func viewDidLoad() {         super.viewDidLoad()         // Do any additional setup after loading the view, typically from a nib.                   // 已经在界面上设计了Cell并定义了identity，不需要注册CollectionViewCell         //self.collectionView.registerClass(UICollectionViewCell.self,         //  forCellWithReuseIdentifier: "ViewCell")         //默认背景是黑色和label一致         self.collectionView?.backgroundColor = UIColor.whiteColor()               }       override func didReceiveMemoryWarning() {         super.didReceiveMemoryWarning()         // Dispose of any resources that can be recreated.     }           // CollectionView行数     override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int)         -> Int {         return courses.count;     }           // 获取单元格     override func collectionView(collectionView: UICollectionView,         cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {         // storyboard里设计的单元格         let identify:String = "DesignViewCell"         // 获取设计的单元格，不需要再动态添加界面元素         let cell = self.collectionView?.dequeueReusableCellWithReuseIdentifier(             identify, forIndexPath: indexPath) as UICollectionViewCell         // 从界面查找到控件元素并设置属性         (cell.contentView.viewWithTag(1) as! UIImageView).image =             UIImage(named: courses[indexPath.item]["pic"]!)         (cell.contentView.viewWithTag(2) as! UILabel).text = courses[indexPath.item]["name"]         return cell     } }

--- Main.storyboard ---

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<?xml version="1.0" encoding="UTF-8" standalone="no"?> <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6254" systemVersion="14B25" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="fNw-sO-QDe">     <dependencies>         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6247"/>     </dependencies>     <scenes>         <!--View Controller-->         <scene sceneID="wxT-ij-Le6">             <objects>                 <collectionViewController id="fNw-sO-QDe" customClass="ViewController" customModule="SwiftInAction_008_015" customModuleProvider="target" sceneMemberID="viewController">                     <collectionView key="view" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="scaleToFill" dataMode="prototypes" id="pK1-nH-r5x">                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>                         <color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>                         <collectionViewFlowLayout key="collectionViewLayout" minimumLineSpacing="10" minimumInteritemSpacing="10" id="UDB-fy-TG6">                             <size key="itemSize" width="92" height="97"/>                             <size key="headerReferenceSize" width="0.0" height="20"/>                             <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" restorationIdentifier="ViewCell" reuseIdentifier="DesignViewCell" id="FKz-79-V4r">                                 <rect key="frame" x="0.0" y="0.0" width="50" height="50"/>                                 <autoresizingMask key="autoresizingMask"/>                                 <view key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center">                                     <rect key="frame" x="0.0" y="0.0" width="92" height="97"/>                                     <autoresizingMask key="autoresizingMask"/>                                     <subviews>                                         <imageView userInteractionEnabled="NO" tag="1" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" translatesAutoresizingMaskIntoConstraints="NO" id="ZmJ-ad-pZs">                                             <rect key="frame" x="4" y="4" width="75" height="65"/>                                         </imageView>                                         <label opaque="NO" clipsSubviews="YES" userInteractionEnabled="NO" tag="2" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" text="Label" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="U4J-Ys-QBF">                                             <rect key="frame" x="4" y="71" width="75" height="21"/>                                             <fontDescription key="fontDescription" type="system" pointSize="17"/>                                             <color key="textColor" cocoaTouchSystemColor="darkTextColor"/>                                             <nil key="highlightedColor"/>                                         </label>                                     </subviews>                                     <color key="backgroundColor" white="0.0" alpha="0.0" colorSpace="calibratedWhite"/>                                 </view>                             </collectionViewCell>                         </cells>                         <collectionReusableView key="sectionHeaderView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" id="rmh-sg-HAy">                             <rect key="frame" x="0.0" y="0.0" width="600" height="20"/>                             <autoresizingMask key="autoresizingMask"/>                         </collectionReusableView>                         <connections>                             <outlet property="dataSource" destination="fNw-sO-QDe" id="LWA-AL-0di"/>                             <outlet property="delegate" destination="fNw-sO-QDe" id="RRE-KH-WU2"/>                         </connections>                     </collectionView>                 </collectionViewController>                 <placeholder placeholderIdentifier="IBFirstResponder" id="tTf-V2-wvH" userLabel="First Responder" sceneMemberID="firstResponder"/>             </objects>             <point key="canvasLocation" x="174" y="137"/>         </scene>     </scenes> </document>