iOS UI-QQ聊天布局

一、Model

BWMessage.h

#import <Foundation/Foundation.h>

typedef enum{
    BWMessageMe    = ,//表示自己
    BWMessageOther =  //表示对方
}BWMessageType;

@interface BWMessage : NSObject
//消息正文
@property(nonatomic, copy)   NSString *text;
//消息时间
@property(nonatomic, copy)   NSString *time;
//消息类型
@property(nonatomic, assign) BWMessageType type;

//记录是否隐藏时间
@property(nonatomic, assign) BOOL hideTime;

- (instancetype)initWithDict:(NSDictionary *)dict;
+ (instancetype)messageWithDict:(NSDictionary *)dict;

@end

#import "BWMessage.h"

@implementation BWMessage

- (instancetype)initWithDict:(NSDictionary *)dict
{
    if (self = [super init]) {
//        _text = dict[@"text"];
//        _time = dict[@"time"];
//        _type =(BWMessageType)dict[@"type"];
        [self setValuesForKeysWithDictionary:dict];
    }
    return self;
}

+ (instancetype)messageWithDict:(NSDictionary *)dict
{
    return [[self alloc] initWithDict:dict];
}

@end

BWMessageFrame.h

 #import <Foundation/Foundation.h>
 #import <CoreGraphics/CoreGraphics.h>

 #define textFont [UIFont systemFontOfSize:16]

 @class BWMessage;

 @interface BWMessageFrame : NSObject

 @property (nonatomic, strong) BWMessage *message;
 @property (nonatomic, assign, readonly) CGRect timeFrame;
 @property (nonatomic, assign, readonly) CGRect iconFrame;
 @property (nonatomic, assign, readonly) CGRect textFrame;

 @property (nonatomic, assign, readonly) CGFloat rowHeight;

 @end

 #import "BWMessageFrame.h"
 #import <UIKit/UIKit.h>
 #import "BWMessage.h"
 #import "NSString+BWTextSize.h"

 @implementation BWMessageFrame

 //重写setMessage
 - (void)setMessage:(BWMessage *)message
 {
     _message = message;

     //计算每个控件的Frame

     //设置统一的间距
     CGFloat margin = ;
     //获取屏幕的宽度
     CGFloat screenW = [UIScreen mainScreen].bounds.size.width;
     //计算时间label的frame
     CGFloat timeX = ;
     CGFloat timeY = ;
     CGFloat timeW = screenW;
     CGFloat timeH = ;

     if (!message.hideTime) {
         //如果需要时间Label，那么再计算frame
         _timeFrame = CGRectMake(timeX, timeY, timeW, timeH);
     }

     //计算头像的frame
     CGFloat iconW = ;
     CGFloat iconH = ;
     CGFloat iconY = CGRectGetMaxY(_timeFrame);
     CGFloat iconX = message.type == BWMessageOther ? margin : screenW - iconW - margin;
     _iconFrame = CGRectMake(iconX, iconY, iconW, iconH);

     //计算正文的frame
     CGSize textSize = [message.text sizeOfTextWithMaxsize:CGSizeMake(, MAXFLOAT) andFont:textFont];
     CGFloat textW = textSize.width+;
     CGFloat textH = textSize.height+;
     CGFloat textY = iconY;
     CGFloat textX = message.type == BWMessageOther ? CGRectGetMaxX(_iconFrame) : screenW - margin - iconW - textW;
     _textFrame = CGRectMake(textX, textY, textW, textH);

     //计算行高
     //获取 头像的最大Y值和正文的最大Y值，然后用最大Y值+margin
     CGFloat maxY = MAX(CGRectGetMaxY(_iconFrame), CGRectGetMaxY(_textFrame));
     _rowHeight = maxY + margin;

 }

 @end

NSString+BWTextSize.h

 //  NSString+BWTextSize.h
 //  IOS_QQ聊天
 //
 //  Created by ma c on 16/1/10.
 //  Copyright (c) 2016年 博文科技. All rights reserved.
 //

 #import <Foundation/Foundation.h>
 #import <UIKit/UIKit.h>
 @interface NSString (BWTextSize)

 //对象方法-计算文本尺寸
 - (CGSize)sizeOfTextWithMaxsize:(CGSize)maxSize andFont:(UIFont *)font;

 //类方法-计算文本尺寸
 + (CGSize)sizeWithText:(NSString *)text andMaxSize:(CGSize)maxSize andFont:(UIFont *)font;

 @end

 //  NSString+BWTextSize.m
 //  IOS_QQ聊天
 //
 //  Created by ma c on 16/1/10.
 //  Copyright (c) 2016年 博文科技. All rights reserved.
 //

 #import "NSString+BWTextSize.h"

 @implementation NSString (BWTextSize)

 - (CGSize)sizeOfTextWithMaxsize:(CGSize)maxSize andFont:(UIFont *)font
 {
     NSDictionary *attr = @{NSFontAttributeName : font};
     return [self boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:attr context:nil].size;
 }

 + (CGSize)sizeWithText:(NSString *)text andMaxSize:(CGSize)maxSize andFont:(UIFont *)font
 {
     return [text sizeOfTextWithMaxsize:maxSize andFont:font];
 }

 @end

三、View

 //  BWMessageCell.h
 //  IOS_QQ聊天
 //
 //  Created by ma c on 16/1/10.
 //  Copyright (c) 2016年 博文科技. All rights reserved.
 //

 #import <UIKit/UIKit.h>
 @class BWMessageFrame;

 @interface BWMessageCell : UITableViewCell

 @property (nonatomic, strong) BWMessageFrame *messageFrame;

 + (instancetype) messageCellWithTableView:(UITableView *)tableView;

 @end

 //  BWMessageCell.m
 //  IOS_QQ聊天
 //
 //  Created by ma c on 16/1/10.
 //  Copyright (c) 2016年 博文科技. All rights reserved.
 //

 #import "BWMessageCell.h"
 #import "BWMessage.h"
 #import "BWMessageFrame.h"

 @interface BWMessageCell ()

 @property (nonatomic, strong) UILabel *lblTime;
 @property (nonatomic, strong) UIImageView *imgViewHead;
 @property (nonatomic, strong) UIButton *btnText;

 @end

 @implementation BWMessageCell

 //创建自定义Cell
 + (instancetype)messageCellWithTableView:(UITableView *)tableView
 {
     NSString *cellIdentifier = @"cellIdentifier";
     BWMessageCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
     if (!cell) {
         cell = [[BWMessageCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellIdentifier];
     }
     //设置单元格的背景颜色
     cell.backgroundColor = [UIColor clearColor];
     return cell;
 }

 #pragma mark - 重写initWithStyle的方法
 - (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
 {
     if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
         //创建子控件

         //显示时间的label
         self.lblTime = [[UILabel alloc] init];
         self.lblTime.textAlignment = NSTextAlignmentCenter;
         self.lblTime.font = [UIFont systemFontOfSize:];
         [self.contentView addSubview:self.lblTime];

         //显示头像的UIImageView
         self.imgViewHead = [[UIImageView alloc] init];
         [self.contentView addSubview:self.imgViewHead];

         //显示正文的按钮
         self.btnText = [[UIButton alloc] init];
         self.btnText.titleLabel.font = textFont;
         [self.btnText setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
         self.btnText.titleLabel.numberOfLines = ;
         //self.btnText.backgroundColor = [UIColor purpleColor];
         //self.btnText.titleLabel.backgroundColor = [UIColor redColor];

         //设置按钮的内边距
         self.btnText.contentEdgeInsets = UIEdgeInsetsMake(, , , );
         [self.contentView addSubview:self.btnText];
     }
     return self;
 }
 #pragma mark - 重写setMessageFrame的方法
 - (void)setMessageFrame:(BWMessageFrame *)messageFrame
 {
     _messageFrame = messageFrame;

     //获取数据模型
     BWMessage *message = messageFrame.message;

     //分别设置控件的数据和frame

     //设置时间的内容和frame
     self.lblTime.text = message.time;
     self.lblTime.frame = messageFrame.timeFrame;
     self.lblTime.hidden = message.hideTime;

     //设置头像的图片和frame
     //根据消息类型，判断应该使用哪张图片
     NSString *iconImg = message.type == BWMessageMe ? @"me" : @"other";
     self.imgViewHead.image = [UIImage imageNamed:iconImg];
     self.imgViewHead.frame = messageFrame.iconFrame;

     //设置正文的内容和frame
     [self.btnText setTitle:message.text forState:UIControlStateNormal];
     self.btnText.frame = messageFrame.textFrame;

     //设置正文的背景图
     NSString *imgNor,*imgHighlighted;
     if (message.type == BWMessageMe) {
         //自己发送的消息
         imgNor = @"chat_send_nor";
         imgHighlighted = @"chat_send_press_pic";
         //设置消息字体的颜色
         [self.btnText setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
     }
     else{
         //对方发送的消息
         imgNor = @"chat_recive_nor";
         imgHighlighted = @"chat_recive_press_pic";
         //设置消息的字体颜色
         [self.btnText setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
     }
     //加载图片
     UIImage *imageNor = [UIImage imageNamed:imgNor];
     UIImage *imageHighlighted = [UIImage imageNamed:imgHighlighted];

     //用平铺的方式拉伸图片
     imageNor = [imageNor stretchableImageWithLeftCapWidth:imageNor.size.width/ topCapHeight:imageNor.size.height/];
     imageHighlighted = [imageHighlighted stretchableImageWithLeftCapWidth:imageHighlighted.size.width/ topCapHeight:imageHighlighted.size.height/];

     //设置背景图
     [self.btnText setBackgroundImage:imageNor forState:UIControlStateNormal];
     [self.btnText setBackgroundImage:imageHighlighted forState:UIControlStateHighlighted];

 }

 - (void)awakeFromNib {
     // Initialization code
 }

 - (void)setSelected:(BOOL)selected animated:(BOOL)animated {
     [super setSelected:selected animated:animated];

     // Configure the view for the selected state
 }

 @end

三、Controller

 //  ViewController.m
 //  IOS_QQ聊天
 //
 //  Created by ma c on 16/1/9.
 //  Copyright (c) 2016年 博文科技. All rights reserved.
 //

 #import "ViewController.h"
 #import "BWMessage.h"
 #import "BWMessageFrame.h"
 #import "BWMessageCell.h"

 @interface ViewController ()<UITableViewDataSource,UITableViewDelegate,UITextFieldDelegate>
 //消息的Frame模型对象
 @property (nonatomic, strong) NSMutableArray *arrMessageFrame;

 @property (weak, nonatomic) IBOutlet UITableView *tableView;
 @property (weak, nonatomic) IBOutlet UITextField *textInput;

 @end

 @implementation ViewController

 #pragma mark - 文本框代理方法

 //return键被单击的时候触发
 - (BOOL)textFieldShouldReturn:(UITextField *)textField
 {
     //1.获取用户输入的文本
     NSString *text = textField.text;

     //2.发送用户的消息
     [self sendMessage:text withType:BWMessageMe];

     //3.发送系统的消息
     [self sendMessage:@"不认识" withType:BWMessageOther];

     //4.清空文本框
     textField.text = nil;

        return YES;
 }
 //发送消息
 - (void)sendMessage:(NSString *)msg withType:(BWMessageType)type
 {
     //1.创建一个数据模型和frame模型
     //数据模型
     BWMessage *model = [[BWMessage alloc] init];
     //获取当前系统时间
     NSDate *nowDate = [NSDate date];
     //创建一个日期格式化器
     NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
     //设置格式
     formatter.dateFormat = @"今天：HH:mm";
     //进行日期的格式化
     model.time = [formatter stringFromDate:nowDate];
     model.type = type;
     model.text = msg;

     //frame模型
     BWMessageFrame *frameModel = [[BWMessageFrame alloc] init];
     frameModel.message = model;
     //根据当前的消息时间和上一条消息的时间，来设置是否隐藏时间Label
     BWMessageFrame *lastMessageFrame = [self.arrMessageFrame lastObject];
     NSString *lastTime = lastMessageFrame.message.time;
     if ([model.time isEqualToString:lastTime]) {
         model.hideTime = YES;
     }

     //2.把frame模型加载到集合中
     [self.arrMessageFrame addObject:frameModel];

     //3.刷新UITableView数据
     [self.tableView reloadData];

     //4.把最后一行滚动到最上面
     NSIndexPath *lastIndexPath = [NSIndexPath indexPathForRow:self.arrMessageFrame.count -  inSection:];
     [self.tableView scrollToRowAtIndexPath:lastIndexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
 }

 #pragma mark - 滚动视图代理方法
 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
 {
     //[self.textInput resignFirstResponder];
     //滚动把键盘叫回去
     [self.view endEditing:YES];
 }

 #pragma mark - 数据源方法
 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 {
     return ;
 }

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
     return self.arrMessageFrame.count;
 }

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
     //1.获取模型数据
     BWMessageFrame *frameModel = self.arrMessageFrame[indexPath.row];
     //2.创建单元格
     BWMessageCell *cell = [BWMessageCell messageCellWithTableView:tableView];
     //3.把模型赋值给单元格
     cell.messageFrame = frameModel;
     //4.返回单元格
     return cell;
 }

 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
 {
     BWMessageFrame *frameModel = self.arrMessageFrame[indexPath.row];
     return frameModel.rowHeight;
 }

 #pragma mark - 懒加载
 - (NSMutableArray *)arrMessageFrame
 {
     if (_arrMessageFrame == nil) {

         NSString *path = [[NSBundle mainBundle] pathForResource:@"messages.plist" ofType:nil];

         NSArray *arrDict = [NSArray arrayWithContentsOfFile:path];
         NSMutableArray *arrModel = [NSMutableArray array];

         for (NSDictionary *dict in arrDict) {
             //创建一个数据模型
             BWMessage *dataModel = [BWMessage messageWithDict:dict];
             //创建一个Frame模型
             BWMessageFrame *modelFrame = [[BWMessageFrame alloc] init];

             //获取上一个数据模型
             BWMessage *lastMessage = (BWMessage *)[[arrModel lastObject] message];
             //判断“当前的模型时间”是否和“上一个模型时间”一样
             if ([dataModel.time isEqualToString:lastMessage.time]) {
                 dataModel.hideTime = YES;
             }
             else
             {
                 dataModel.hideTime = NO;
             }

             modelFrame.message = dataModel;

             //把Frame模型加载到arrModel模型数组中
             [arrModel addObject:modelFrame];
         }
         _arrMessageFrame = arrModel;
     }
     return _arrMessageFrame;
 }

 #pragma mark - 视图加载
 - (void)viewDidLoad {
     [super viewDidLoad];
     //取消分割线
     self.tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
     //设置TableView的背景色
     self.tableView.backgroundColor = [UIColor colorWithRed:236.0/ green:236.0/ blue:236.0/ alpha:];
     //设置TableView的行不允许被选中
     self.tableView.allowsSelection = NO;
     //设置文本框距离最左侧有一段距离
     UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(, , , )];
     //把leftView设置给文本框
     self.textInput.leftView = leftView;
     self.textInput.leftViewMode = UITextFieldViewModeWhileEditing;

     //监听键盘的弹出事件
     //1.创建一个NSNotificationCenter对象
     NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
     //2.监听键盘弹出发出的通知
     [center addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];

 }
 //通知关联方法
 - (void)keyboardWillChangeFrame:(NSNotification *)noteInfo
 {
 //    NSLog(@"通知的名称：%@",noteInfo.name);
 //    NSLog(@"通知的发布者：%@",noteInfo.object);
 //    NSLog(@"通知的内容：%@",noteInfo.userInfo);
     //1.获取键盘显示完毕或者隐藏完毕后的Y值
     CGRect rectEnd = [noteInfo.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
     CGFloat keyboardY = rectEnd.origin.y;
     //用键盘的Y值减去屏幕的高度计算平移的值
     CGFloat transformValue = keyboardY - self.view.frame.size.height;

     [UIView animateWithDuration:0.25 animations:^{

         self.view.transform = CGAffineTransformMakeTranslation(, transformValue);
     }];

     //让UITableView的最后一行滚动到最上面
     NSIndexPath *lastRowindexPath = [NSIndexPath indexPathForRow:self.arrMessageFrame.count -  inSection:];
     [self.tableView scrollToRowAtIndexPath:lastRowindexPath atScrollPosition:UITableViewScrollPositionTop animated:YES];
 }

 - (void)dealloc
 {
     [[NSNotificationCenter defaultCenter] removeObserver:self];
 }

 - (BOOL)prefersStatusBarHidden
 {
     return YES;
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 @end