swift QQ聊天界面 cell 的计算

//

// ChatViewCell.swift

//

// Created by 柯木超 on 15/7/16.

// copyright (c) 2015年 CCC. All rights reserved.

//

import UIKit

enum JLMessageType{

case me

case other

}

class ChatViewCell: UITableViewCell {

var MAXFLOAT:CGFloat = 0x1.fffffep+127 //文本最大高度

var _icon=UIImageView();

var _times=UILabel();

var _content:UIButton=UIButton.buttonWithType(UIButtonType.System) as! UIButton;

var bgImage = UIImageView();

var height:CGFloat=0;

var iconWidth:CGFloat=30;

var cellWidth:CGFloat=10;

var timeWidth:CGFloat=20;

var contentWidthWithBgImage:CGFloat=10;//文本与背景的边界距离

var JLTextFont:UIFont = UIFont(name: "HelveticaNeue",size: 15)!;

/**

* 是否隐藏时间(如果连续多条信息的时间相同，只能有一条信息显示时间)

*/

var hideTime:Bool?;

var chatMessageModel:ChatMessageModel?{

didSet{

self.addSubview(bgImage);

self.addSubview(_icon);

self.addSubview(_times);

self.addSubview(_content);

self.backgroundColor = UIColor.clearColor();

//填充内容

_icon.image=UIImage(named: "xiaohua");

var nf = NSDateFormatter();

nf.dateFromString("yyyy-MM-dd HH:mm")

_times.text = nf.stringFromDate(chatMessageModel!.time!);

_times.textAlignment = NSTextAlignment.Center;

_times.textColor = UIColor.blackColor()

// _content.backgroundColor = UIColor.yellowColor();

_content.setTitle(chatMessageModel?.content,forState: UIControlState.normal);

_content.setTitleColor(UIColor.blackColor(),forState: UIControlState.normal)

_content.titleLabel!.numberOfLines = 0;

// _content.titleLabel!.textColor = UIColor.blackColor()

_content.titleLabel!.font = UIFont(name: "HelveticaNeue",size: 14);

// 设置文本距离UIButton的边距

_content.contentEdgeInsets = UIEdgeInsetsMake(1.5*contentWidthWithBgImage,2*contentWidthWithBgImage,1.5*contentWidthWithBgImage,2*contentWidthWithBgImage)

//填充背景

if(chatMessageModel?.sourceId==7){ //7是本人,暂时先写成硬编码

bgImage.image = UIImage(named: "meme");

}else{

bgImage.image = UIImage(named: "other");

}

//算内容所占的空间

if(chatMessageModel?.sourceId==7){

//显示时间

if(chatMessageModel?.hideTime==1){

_times.frame = CGRect(x: (WIDTH-150)/2,y: 0,width: 150,height: timeWidth)

}

_icon.frame = CGRect(x: WIDTH-30*TMP-10*TMP,y: CGRectGetMaxY(_times.frame)+3*TMP,width: iconWidth,height: iconWidth)

//文本信息的最大宽度

var MAXWIDTH:CGFloat = WIDTH-30*TMP*2-50*TMP;

// 文本信息的最大尺寸

var textMaxSize = CGSizeMake(MAXWIDTH,MAXFLOAT);

var text:Nsstring = Nsstring(string: chatMessageModel!.content!);

var dict:NSDictionary = NSDictionary(object:JLTextFont,forKey: NSFontAttributeName)

//文本信息真实尺寸

var textRealSize = text.boundingRectWithSize(textMaxSize,options: NsstringDrawingOptions.UsesLineFragmentOrigin,attributes: dict as [NSObject : AnyObject],context: nil);

_content.frame = CGRect(x: WIDTH-textRealSize.width-iconWidth-55*TMP,y: CGRectGetMaxY(_icon.frame)-iconWidth,width: textRealSize.width+4*contentWidthWithBgImage,height: textRealSize.height+3*contentWidthWithBgImage);

_content.setBackgroundImage(UIImage.resizableImage("meme"),forState: UIControlState.normal)

println("me icon===\(_icon)")

println("me _times=====\(_times)")

println("me content====\(_content)")

println("me bgimage==\(bgImage)");

height = CGRectGetMaxY(_content.frame);

}

//别人发的信息

else{

//显示时间

if(chatMessageModel?.hideTime==1){

_times.frame = CGRect(x: (WIDTH-150)/2,height: timeWidth)

}

_icon.frame = CGRect(x: 10*TMP,y: CGRectGetMaxY(_times.frame)+3*HeightTMP,height: iconWidth)

//文本信息的最大宽度

var MAXWIDTH:CGFloat = WIDTH-40*TMP*2-20*TMP*2;

// 文本信息的最大尺寸

var textMaxSize = CGSizeMake(MAXWIDTH,context: nil);

_content.frame = CGRect(x: 15*TMP+iconWidth,height: textRealSize.height+2*contentWidthWithBgImage);

_content.setBackgroundImage(UIImage.resizableImage("other"),forState: UIControlState.normal)

// bgImage.frame = CGRect(x: 10*TMP+iconWidth,y: _content.frame.origin.y-10*TMP,width: _content.frame.size.width+30*TMP,height: _content.frame.size.height+20*TMP);

println("you icon===\(_icon)")

println("you _times=====\(_times)")

println("you content====\(_content)")

println("you bgimage==\(bgImage)");

height = CGRectGetMaxY(_content.frame);

}

}

}

override func awakeFromNib() {

super.awakeFromNib()

}

override func setSelected(selected: Bool,animated: Bool) {

super.setSelected(selected,animated: animated)

}

}

这里介绍的不是特别清楚，提供代码下载，代码很简单