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
