聊天布局

时间：2018-08-05 14:22:34 阅读：146 评论：0 收藏：0 [点我收藏+]

标签：hidden hide oar tle 强制 float turn assign sign

1、XMGMessage.h

#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

2、XMGMessage.m

#import "XMGMessage.h"

@implementation XMGMessage

+ (instancetype)messageWithDict:(NSDictionary *)dict {

    XMGMessage *message = [[self alloc] init];
    [message setValuesForKeysWithDictionary:dict];
    return message;
}

@end

3、Main.storyboard

3.1 设置 cell
- 单 Cell 布局
- 多 Cell 布局
3.2 设置气泡图片拉伸
3.3 设置按钮边距

4、XMGMessageCell.h

#import <UIKit/UIKit.h>

@class XMGMessage;

@interface XMGMessageCell : UITableViewCell

@property (nonatomic, strong) XMGMessage *message;

@end

5、XMGMessageCell.m

5.1 单 Cell 布局

#import "XMGMessageCell.h"
#import "XMGMessage.h"

#define MAS_SHORTHAND
#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);
        }];
    }

    // 强制更新
    [self layoutIfNeeded];

    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

5.2 多 Cell 布局

#import "XMGMessageCell.h"
#import "XMGMessage.h"

#define MAS_SHORTHAND
#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;

@end

@implementation XMGMessageCell

- (void)awakeFromNib {

    self.textButton.titleLabel.numberOfLines = 0;
}

- (void)setMessage:(XMGMessage *)message {

    _message = message;

    // 时间处理
    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);
        }];
    }

    // 处理显示的消息文字
    // 设置按钮的文字
    [self.textButton setTitle:self.message.text forState:UIControlStateNormal];

    // 强制更新
    [self layoutIfNeeded];

    // 设置按钮的高度就是titleLabel的高度
    [self.textButton updateConstraints:^(MASConstraintMaker *make) {
        CGFloat buttonH = self.textButton.titleLabel.frame.size.height + 30;
        make.height.equalTo(buttonH);
    }];

    // 强制更新
    [self layoutIfNeeded];

    // 计算当前cell的高度
    CGFloat buttonMaxY = CGRectGetMaxY(self.textButton.frame);
    CGFloat iconMaxY = CGRectGetMaxY(self.iconView.frame);
    self.message.cellHeight = MAX(buttonMaxY, iconMaxY) + 10;
}
@end

6、XMGChatingViewController.m

#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];

            //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;
}

#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