源码-0205-02--聊天布局02

//  XMGChatingViewController.m
//  07-聊天布局
#import "XMGChatingViewController.h"
#import "XMGMessage.h"
#import "XMGMessageCell.h"

@interface XMGChatingViewController () <UITableViewDataSource, UITableViewDelegate>
@property (nonatomic, strong) NSArray *messages;
@end

@implementation XMGChatingViewController

- (NSArray *)messages
{
    if (_messages == nil) {
        // 加载plist中的字典数组
        NSString *path = [[NSBundle mainBundle] pathForResource:@"messages.plist" ofType:nil];
        NSArray *dictArray = [NSArray arrayWithContentsOfFile:path];
        
        // 字典数组 -> 模型数组
        NSMutableArray *messageArray = [NSMutableArray array];
        // 用来记录上一条消息模型
        XMGMessage *lastMessage = nil;
        for (NSDictionary *dict in dictArray) {
            XMGMessage *message = [XMGMessage messageWithDict:dict];
            message.hideTime = [message.time isEqualToString:lastMessage.time];
            [messageArray addObject:message];
            
            lastMessage = message;
        }
        
        _messages = messageArray;
    }
    return _messages;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
}

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

#pragma mark - <UITableViewDataSource>
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.messages.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    XMGMessageCell *cell = [tableView dequeueReusableCellWithIdentifier:@"message"];
    
    cell.message = self.messages[indexPath.row];
    
    return cell;
}

#pragma mark - <UITableViewDelegate>
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 200;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    XMGMessage *message = self.messages[indexPath.row];
    return message.cellHeight;
}
@end

//  XMGMessage.h
//  07-聊天布局
#import <UIKit/UIKit.h>

typedef enum {
    XMGMessageTypeMe = 0,
    XMGMessageTypeOther = 1
} XMGMessageType;

@interface XMGMessage : NSObject
@property (nonatomic, strong) NSString *text;
@property (nonatomic, strong) NSString *time;
@property (nonatomic, assign) XMGMessageType type;

/** cell的高度 */
@property (nonatomic, assign) CGFloat cellHeight;
/** 是否隐藏时间 */
@property (nonatomic, assign, getter=isHideTime) BOOL hideTime;

+ (instancetype)messageWithDict:(NSDictionary *)dict;
@end

//  XMGMessage.m
//  07-聊天布局
#import "XMGMessage.h"

@implementation XMGMessage

+ (instancetype)messageWithDict:(NSDictionary *)dict
{
    XMGMessage *message = [[self alloc] init];
    [message setValuesForKeysWithDictionary:dict];
    return message;
}
@end

//  XMGMessageCell.h
//  07-聊天布局
#import <UIKit/UIKit.h>
@class XMGMessage;

@interface XMGMessageCell : UITableViewCell
@property (nonatomic, strong) XMGMessage *message;
@end

//  XMGMessageCell.m
//  07-聊天布局
#import "XMGMessageCell.h"
#import "XMGMessage.h"
//define this constant if you want to use Masonry without the ‘mas_‘ prefix
#define MAS_SHORTHAND
//define this constant if you want to enable auto-boxing for default syntax
#define MAS_SHORTHAND_GLOBALS
#import "Masonry.h"

@interface XMGMessageCell()
@property (weak, nonatomic) IBOutlet UILabel *timeLabel;
@property (weak, nonatomic) IBOutlet UIButton *textButton;
@property (weak, nonatomic) IBOutlet UIImageView *iconView;

@property (weak, nonatomic) IBOutlet UIButton *otherTextButton;
@property (weak, nonatomic) IBOutlet UIImageView *otherIconView;
@end

@implementation XMGMessageCell


- (void)awakeFromNib
{
    self.textButton.titleLabel.numberOfLines = 0;
    self.otherTextButton.titleLabel.numberOfLines = 0;
}

- (void)setMessage:(XMGMessage *)message
{
    _message = message;
    
    if (message.hideTime) { // 隐藏时间
        self.timeLabel.hidden = YES;
        [self.timeLabel updateConstraints:^(MASConstraintMaker *make) {
            make.height.equalTo(0);
        }];
    } else { // 显示时间
        self.timeLabel.text = message.time;
        self.timeLabel.hidden = NO;
        [self.timeLabel updateConstraints:^(MASConstraintMaker *make) {
            make.height.equalTo(21);
        }];
    }
    
    if (message.type == XMGMessageTypeMe) { // 右边
        [self settingShowTextButton:self.textButton showIconView:self.iconView hideTextButton:self.otherTextButton hideIconView:self.otherIconView];
    } else { // 左边
        [self settingShowTextButton:self.otherTextButton showIconView:self.otherIconView hideTextButton:self.textButton hideIconView:self.iconView];
    }
}

/**
 * 处理左右按钮、头像
 */
- (void)settingShowTextButton:(UIButton *)showTextButton showIconView:(UIImageView *)showIconView hideTextButton:(UIButton *)hideTextButton hideIconView:(UIImageView *)hideIconView
{
    hideTextButton.hidden = YES;
    hideIconView.hidden = YES;
    
    showTextButton.hidden = NO;
    showIconView.hidden = NO;
    
    // 设置按钮的文字
    [showTextButton setTitle:self.message.text forState:UIControlStateNormal];
    
    // 强制更新
    [showTextButton layoutIfNeeded];
    
    // 设置按钮的高度就是titleLabel的高度
    [showTextButton updateConstraints:^(MASConstraintMaker *make) {
        CGFloat buttonH = showTextButton.titleLabel.frame.size.height;
        make.height.equalTo(buttonH);
    }];
    
    // 强制更新
    [showTextButton layoutIfNeeded];
    
    // 计算当前cell的高度
    CGFloat buttonMaxY = CGRectGetMaxY(showTextButton.frame);
    CGFloat iconMaxY = CGRectGetMaxY(showIconView.frame);
    self.message.cellHeight = MAX(buttonMaxY, iconMaxY) + 10;
}

@end