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同cell实现qq聊天框效果

2016-04-20  本文已影响181人  letaibai

qq聊天框是一个非常典型的cell.这个项目既可以用同一个cell来完成,也可以分成两个cell来操作.

** 准备工作: **

  • 新建DLmessage模型类文件.
  • 新建DLMessageCell类文件,将storyboard中cell的class改为DLMessageCell.设置cell的重用标识为message
  • 新建DLMessageViewController类文件,将storyboard中的控制器class改为DLMessageViewControlle.

1.将所需控件布局到storyboard,并设置控件的图片等属性,并设置控制器为tableView的数据源和代理
如下图:

设置控件 设置代理和数据源

2.通过autoLayout设置每个控件的布局,其中button的宽度属性大于等于 60 小于等于 240 ,这样button里面的titleLabel属性就能跟随内容长度变化,从而也就决定了button的宽度长短.在自定义cell类的awakeFromNib方法中设置button中titleLabel的numberOfLines为零,这样就实现了Button内容的自动换行功能.

- (void)awakeFromNib{
   //设置titleLabel达到button最大宽度时自动换行
    self.messageButton.titleLabel.numberOfLines = 0;
    self.otherButtonLable.titleLabel.numberOfLines=0;
}

3.将控件连线DLMessageCell类扩展中.

连线

4.创建DLmessage模型中的成员属性,使其能够加载并记录plist文件数据.

DLmessage.h文件
#import <UIKit/UIKit.h>

typedef enum {
    DLMessageTypeMe = 0,
    DLMessageTypeOther = 1
} DLMessageType;

@interface DLMessage : NSObject
@property(nonatomic,strong) NSString *text;
@property(nonatomic,strong) NSString *time;
@property(nonatomic,assign) DLMessageType type;
//记录行高,取出cell中高度的最大值来赋值
@property(nonatomic,assign) CGFloat cellHeight;
//记录发送时间是否显示
@property(nonatomic,assign,getter=isHideTime) BOOL hideTime;
//构造方法,方便外界传入plist文件
+ (instancetype)messageWithDict:(NSDictionary *)dict;
@end

DLmessage.m文件
#import "DLMessage.h"

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

5.在DLMessageCell.h文件中新建模型类成员属性,在.m中重写set方法,将数据传给子控件

DLMessageCell.h文件

#import <UIKit/UIKit.h>

@class DLMessage;

@interface DLMessageCell : UITableViewCell

@property(nonatomic,strong) DLMessage *message;
@end

DLMessageCell.m文件

#import "DLMessageViewCell.h"
#import "DLMessage.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 MessageViewCell ()

 /**  获得成员变量  */
@property (weak, nonatomic) IBOutlet UIImageView *nameView;
@property (weak, nonatomic) IBOutlet UIButton *ButtonLabel;
@property (weak, nonatomic) IBOutlet UILabel *timeLabel;
@property (weak, nonatomic) IBOutlet UIButton *otherButtonLabel;
@property (weak, nonatomic) IBOutlet UIImageView *otherNameView;

@end

@implementation DLMessageViewCell

 /**  设置自动换行  */
-(void)awakeFromNib
{
    self.ButtonLable.titleLabel.numberOfLines=0;
    self.otherButtonLable.titleLabel.numberOfLines=0;
}
 /**  设置模型的值给成员变量 */
-(void)setMessage:(Message *)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);
        }];
    }
    //根据模型的type设置显示哪一边的cell,并设置内容
    if (message.type == DLMessageTypeMe) {
        [self settingShowButton:self.ButtonLabel ShowImageView:self.nameView HideButton:self.otherButtonLabel HideImageView:self.otherNameView];
    }else{
        [self settingShowButton:self.otherButtonLabel ShowImageView:self.otherNameView HideButton:self.ButtonLabel HideImageView:self.nameView];
    }

}
  //方法抽出
- (void)settingShowButton:(UIButton *)showButton ShowImageView:(UIImageView *)showImageView HideButton:(UIButton *)hideButton HideImageView:(UIImageView *)hideImageView{
    
    hideButton.hidden=YES;
    hideImageView.hidden=YES;
    
    showImageView.hidden=NO;
    showButton.hidden=NO;
    
    [showButton setTitle:self.message.text forState:UIControlStateNormal];
    //强制更新,确保数值更新
    [showButton layoutIfNeeded];
    //设置button的高度与label相同
    [showButton updateConstraints:^(MASConstraintMaker *make) {
        CGFloat ButtonH=showButton.titleLabel.frame.size.height + 30;
        make.height.equalTo(ButtonH);
    }];
    //强制更新,确保数值更新
    [showButton layoutIfNeeded];
    //获取button与nameView的最大值,设置最大值为cell的高度
    CGFloat buttonMaxY = CGRectGetMaxY(showButton.frame) + 10;
    CGFloat iconMaxY = CGRectGetMaxY(showImageView.frame) + 10;
    self.message.cellHeight = MAX(buttonMaxY, iconMaxY);    
}
@end

6.在DLMessageViewController中新建数组,加载模型数据,同时实现tableView的数据源方法,需遵守UITableViewDataSource,UITableViewDelegate协议.

DLMessageViewController.m文件

#import "DLMessageViewController.h"
#import "DLMessageViewCell.h"
#import "DLMessage.h"

@interface DLMessageViewController ()<UITableViewDataSource,UITableViewDelegate>

@property(nonatomic,strong) NSArray *messages;

@end

@implementation MessageViewController

#pragma mark - 懒加载
-(NSArray *)messages
{
    if (_messages==nil) {
        NSString *path=[[NSBundle mainBundle] pathForResource:@"messages.plist" ofType:nil];
        NSArray *dictArray=[NSArray arrayWithContentsOfFile:path];
        NSMutableArray *messageArr=[NSMutableArray array];
        //定义一个模型接收上一次的时间
        Message *lastMessage = nil;
        for (NSDictionary *dict in dictArray) {
            Message *message=[Message messageWithDict:dict];
            //比较两次的时间是否相同,返回BOOL值
            message.hideTime = [lastMessage.time isEqualToString:message.time];
            [messageArr addObject:message];
            记录上一个遍历出来的模型
            lastMessage = message;
        }
        _messages=messageArr;
    }
    return _messages;
}
- (void)viewDidLoad {
    [super viewDidLoad];
}
#pragma mark - 设置cell

 /**  设置cell数  */
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.messages.count;
}
 /**  设置每行cell显示的内容  */
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    MessageViewCell *cell=[tableView dequeueReusableCellWithIdentifier:@"message"];
    cell.message = self.messages[indexPath.row];
    return cell;
}
 /**  cell的高度*/
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    Message *message=self.messages[indexPath.row];
    return message.cellHeight;
}
 /**  设置cell的虚拟行高  */
-(CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return 200;
}
@end
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