1，下面是一个放微信聊天界面的消息展示列表，实现的功能有：
（1）消息可以是文本消息也可以是图片消息
（2）消息背景为气泡状图片，同时消息气泡可根据内容自适应大小
（3）每条消息旁边有头像，在左边表示发送方，在右边表示接收方
2，实现思路
（1）需要定义一个数据结构保存消息内容 MessageItem
（2）继承UITableViewCell实现自定义单元格，这里面放入头像和消息体
（3）继承UITableView实现自定义表格，通过读取数据源，进行页面的渲染
（4）消息体根据内容类型不同，用不同的展示方法
（5）每个单元格的高度需要根据内容计算出来
（6）数据由ViewController来提供初始化数据
3，效果图
4，代码结构
5，主要代码
（1）主页面 ViewController.swift
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | import UIKit class ViewController : UIViewController , ChatDataSource { var Chats : Array < MessageItem >! var tableView: TableView ! override func viewDidLoad() { super .viewDidLoad() // Do any additional setup after loading the view, typically from a nib. setupChatTable() } /*创建表格及数据*/ func setupChatTable() { self .tableView = TableView (frame: CGRectMake (0, 20, self .view.frame.size.width, self .view.frame.size.height - 20)) //创建一个重用的单元格 self .tableView!.registerClass( TableViewCell . self , forCellReuseIdentifier: "MsgCell" ) var me = "xiaoming.png" var you = "xiaohua.png" var first = MessageItem (body: "嘿，这张照片咋样，我周末拍的呢！" , logo:me, date: NSDate (timeIntervalSinceNow:-600), mtype: ChatType . Mine ) var second = MessageItem (image: UIImage (named: "luguhu.jpeg" )!,logo:me, date: NSDate (timeIntervalSinceNow:-290), mtype: ChatType . Mine ) var third = MessageItem (body: "太赞了，我也想去那看看呢！" ,logo:you, date: NSDate (timeIntervalSinceNow:-60), mtype: ChatType . Someone ) var fouth = MessageItem (body: "嗯，下次我们一起去吧！" ,logo:me, date: NSDate (timeIntervalSinceNow:-20), mtype: ChatType . Mine ) var fifth = MessageItem (body: "好的，一定！" ,logo:you, date: NSDate (timeIntervalSinceNow:0), mtype: ChatType . Someone ) Chats = [first,second, third, fouth, fifth] self .tableView.chatDataSource = self self .tableView.reloadData() self .view.addSubview( self .tableView) } override func didReceiveMemoryWarning() { super .didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } /*返回对话记录中的全部行数*/ func rowsForChatTable(tableView: TableView ) -> Int { return self . Chats .count } /*返回某一行的内容*/ func chatTableView(tableView: TableView , dataForRow row: Int ) -> MessageItem { return Chats [row] } } |
（2）消息体数据结构 MessageItem.swift
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 | import UIKit //消息类型，我的还是别人的 enum ChatType { case Mine case Someone } class MessageItem { //头像 var logo: String //消息时间 var date: NSDate //消息类型 var mtype: ChatType //内容视图，标签或者图片 var view: UIView //边距 var insets: UIEdgeInsets //设置我的文本消息边距 class func getTextInsetsMine() -> UIEdgeInsets { return UIEdgeInsets (top:5, left:10, bottom:11, right:17) } //设置他人的文本消息边距 class func getTextInsetsSomeone() -> UIEdgeInsets { return UIEdgeInsets (top:5, left:15, bottom:11, right:10) } //设置我的图片消息边距 class func getImageInsetsMine() -> UIEdgeInsets { return UIEdgeInsets (top:11, left:13, bottom:16, right:22) } //设置他人的图片消息边距 class func getImageInsetsSomeone() -> UIEdgeInsets { return UIEdgeInsets (top:11, left:13, bottom:16, right:22) } //构造文本消息体 convenience init (body: NSString , logo: String , date: NSDate , mtype: ChatType ) { var font = UIFont .boldSystemFontOfSize(12) var width = 225, height = 10000.0 var atts = NSMutableDictionary () atts.setObject(font,forKey: NSFontAttributeName ) var size = body.boundingRectWithSize( CGSizeMake ( CGFloat (width), CGFloat (height)), options: NSStringDrawingOptions . UsesLineFragmentOrigin , attributes:atts, context: nil ) var label = UILabel (frame: CGRectMake (0, 0, size.size.width, size.size.height)) label.numberOfLines = 0 label.lineBreakMode = NSLineBreakMode . ByWordWrapping label.text = (body.length != 0 ? body : "" ) label.font = font label.backgroundColor = UIColor .clearColor() var insets: UIEdgeInsets = (mtype == ChatType . Mine ? MessageItem .getTextInsetsMine() : MessageItem .getTextInsetsSomeone()) self . init (logo:logo, date:date, mtype:mtype, view:label, insets:insets) } //可以传入更多的自定义视图 init (logo: String , date: NSDate , mtype: ChatType , view: UIView , insets: UIEdgeInsets ) { self .view = view self .logo = logo self .date = date self .mtype = mtype self .insets = insets } //构造图片消息体 convenience init (image: UIImage , logo: String , date: NSDate , mtype: ChatType ) { var size = image.size //等比缩放 if (size.width > 220) { size.height /= (size.width / 220); size.width = 220; } var imageView = UIImageView (frame: CGRectMake (0, 0, size.width, size.height)) imageView.image = image imageView.layer.cornerRadius = 5.0 imageView.layer.masksToBounds = true var insets: UIEdgeInsets = (mtype == ChatType . Mine ? MessageItem .getImageInsetsMine() : MessageItem .getImageInsetsSomeone()) self . init (logo:logo, date:date, mtype:mtype, view:imageView, insets:insets) } } |
（3）表格数据协议 ChatDataSource.swift
| 1 2 3 4 5 6 7 8 9 10 11 12 | import Foundation /* 数据提供协议 */ protocol ChatDataSource { /*返回对话记录中的全部行数*/ func rowsForChatTable( tableView: TableView ) -> Int /*返回某一行的内容*/ func chatTableView(tableView: TableView , dataForRow: Int )-> MessageItem } |
（4）自定义表格 TableView.swift
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | import UIKit class TableView : UITableView , UITableViewDelegate , UITableViewDataSource { //用于保存所有消息 var bubbleSection: Array < MessageItem >! //数据源，用于与 ViewController 交换数据 var chatDataSource: ChatDataSource ! required init (coder aDecoder: NSCoder ) { super . init (coder: aDecoder) } override init (frame: CGRect ) { self .bubbleSection = Array < MessageItem >() super . init (frame:frame, style: UITableViewStyle . Grouped ) self .backgroundColor = UIColor .clearColor() self .separatorStyle = UITableViewCellSeparatorStyle . None self .delegate = self self .dataSource = self } override func reloadData() { self .showsVerticalScrollIndicator = false self .showsHorizontalScrollIndicator = false var count = 0 if (( self .chatDataSource != nil )) { count = self .chatDataSource.rowsForChatTable( self ) if (count > 0) { for ( var i = 0; i < count; i++) { var object = self .chatDataSource.chatTableView( self , dataForRow:i) bubbleSection.append(object) } //按日期排序方法 bubbleSection. sort ({$0.date.timeIntervalSince1970 < $1.date.timeIntervalSince1970}) } } super .reloadData() } //第一个方法返回分区数，在本例中，就是1 func numberOfSectionsInTableView(tableView: UITableView )-> Int { return 1 } //返回指定分区的行数 func tableView(tableView: UITableView , numberOfRowsInSection section: Int ) -> Int { if (section >= self .bubbleSection.count) { return 1 } return self .bubbleSection.count+1 } //用于确定单元格的高度，如果此方法实现得不对，单元格与单元格之间会错位 func tableView(tableView: UITableView ,heightForRowAtIndexPath indexPath: NSIndexPath ) -> CGFloat { // Header if (indexPath.row == 0) { return 30.0 } var data = self .bubbleSection[indexPath.row - 1] return max (data.insets.top + data.view.frame.size.height + data.insets.bottom, 52) } //返回自定义的 TableViewCell func tableView(tableView: UITableView , cellForRowAtIndexPath indexPath: NSIndexPath ) -> UITableViewCell { var cellId = "MsgCell" if (indexPath.row > 0) { var data = self .bubbleSection[indexPath.row-1] var cell = TableViewCell (data:data, reuseIdentifier:cellId) return cell } else { return UITableViewCell (style: UITableViewCellStyle . Default , reuseIdentifier: cellId) } } } |
（5）自定义单元格 TableViewCell.swift
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | import UIKit class TableViewCell : UITableViewCell { //消息内容视图 var customView: UIView ! //消息背景 var bubbleImage: UIImageView ! //头像 var avatarImage: UIImageView ! //消息数据结构 var msgItem: MessageItem ! required init (coder aDecoder: NSCoder ) { super . init (coder: aDecoder) } //- (void) setupInternalData init (data: MessageItem , reuseIdentifier cellId: String ) { self .msgItem = data super . init (style: UITableViewCellStyle . Default , reuseIdentifier:cellId) rebuildUserInterface() } func rebuildUserInterface() { self .selectionStyle = UITableViewCellSelectionStyle . None if ( self .bubbleImage == nil ) { self .bubbleImage = UIImageView () self .addSubview( self .bubbleImage) } var type = self .msgItem.mtype var width = self .msgItem.view.frame.size.width var height = self .msgItem.view.frame.size.height var x = (type == ChatType . Someone ) ? 0 : self .frame.size.width - width - self .msgItem.insets.left - self .msgItem.insets.right var y: CGFloat = 0 //显示用户头像 if ( self .msgItem.logo != "" ) { var logo = self .msgItem.logo self .avatarImage = UIImageView (image: UIImage (named:(logo != "" ? logo : "noAvatar.png" ))) self .avatarImage.layer.cornerRadius = 9.0 self .avatarImage.layer.masksToBounds = true self .avatarImage.layer.borderColor = UIColor (white:0.0 ,alpha:0.2). CGColor self .avatarImage.layer.borderWidth = 1.0 //别人头像，在左边，我的头像在右边 var avatarX = (type == ChatType . Someone ) ? 2 : self .frame.size.width - 52 //头像居于消息底部 var avatarY = height //set the frame correctly self .avatarImage.frame = CGRectMake (avatarX, avatarY, 50, 50) self .addSubview( self .avatarImage) var delta = self .frame.size.height - ( self .msgItem.insets.top + self .msgItem.insets.bottom + self .msgItem.view.frame.size.height) if (delta > 0) { y = delta } if (type == ChatType . Someone ) { x += 54 } if (type == ChatType . Mine ) { x -= 54 } } self .customView = self .msgItem.view self .customView.frame = CGRectMake (x + self .msgItem.insets.left, y + self .msgItem.insets.top, width, height) self .addSubview( self .customView) //如果是别人的消息，在左边，如果是我输入的消息，在右边 if (type == ChatType . Someone ) { self .bubbleImage.image = UIImage (named:( "yoububble.png" ))!.stretchableImageWithLeftCapWidth(21,topCapHeight:14) } else { self .bubbleImage.image = UIImage (named: "mebubble.png" )!.stretchableImageWithLeftCapWidth(15, topCapHeight:14) } self .bubbleImage.frame = CGRectMake (x, y, width + self .msgItem.insets.left + self .msgItem.insets.right, height + self .msgItem.insets.top + self .msgItem.insets.bottom) } } |
6，源码下载：
7，功能改进版下载：
（1）消息按天分组展示
（2）增加消息发送框，可以发送和展示消息
