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
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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
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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
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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
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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
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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:WeiXinChart.zip
7,功能改进版下载:WeiXinChart_advance.zip
(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