• 02060601-聊天布局


    //
    //  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;
    @property (weak, nonatomic) IBOutlet UITextField *messageField;
    @property (weak, nonatomic) IBOutlet NSLayoutConstraint *bottomSpacing;
    @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];
                //埋下伏笔,加载数据时,判断哪个时间值相等。
                message.hideTime = [message.time isEqualToString:lastMessage.time];
                [messageArray addObject:message];
                
                lastMessage = message;
            }
            
            _messages = messageArray;
        }
        return _messages;
    }
    
    - (void)viewDidLoad {
        [super viewDidLoad];
        
        // 设置文本框左边的内容 文本框内小间距
        UIView *leftView = [[UIView alloc] init];
        leftView.frame = CGRectMake(0, 0, 10, 0);
        self.messageField.leftView = leftView;
        self.messageField.leftViewMode = UITextFieldViewModeAlways;
    }
    
    - (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;
    }
    
    - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
    {
        
    }
    @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.contentEdgeInsets
    //    self.textButton.imageEdgeInsets
    //    self.textButton.titleEdgeInsets
        self.textButton.titleLabel.numberOfLines = 0;
        self.otherTextButton.titleLabel.numberOfLines = 0;
    //    self.textButton.titleLabel.backgroundColor = [UIColor redColor];
    //    self.otherTextButton.titleLabel.backgroundColor = [UIColor redColor];
    }
    
    - (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 + 30;
            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
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  • 原文地址:https://www.cnblogs.com/laugh/p/6508642.html
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