qq聊天框是一個非常典型的cell.這個項目既可以用同一個cell來完成,也可以分成兩個cell來操作.
** 準備工作: **
- 新建DLmessage模型類文件.
- 新建DLMessageCell類文件,將storyboard中cell的class改為DLMessageCell.設置cell的重用標識為message
- 新建DLMessageViewController類文件,將storyboard中的控制器class改為DLMessageViewControlle.
1.將所需控件布局到storyboard,并設置控件的圖片等屬性,并設置控制器為tableView的數據源和代理
如下圖:
設置控件
設置代理和數據源
2.通過autoLayout設置每個控件的布局,其中button的寬度屬性大于等于 60 小于等于 240 ,這樣button里面的titleLabel屬性就能跟隨內容長度變化,從而也就決定了button的寬度長短.在自定義cell類的awakeFromNib方法中設置button中titleLabel的numberOfLines為零,這樣就實現了Button內容的自動換行功能.
- (void)awakeFromNib{
//設置titleLabel達到button最大寬度時自動換行
self.messageButton.titleLabel.numberOfLines = 0;
self.otherButtonLable.titleLabel.numberOfLines=0;
}
3.將控件連線DLMessageCell類擴展中.
連線
4.創建DLmessage模型中的成員屬性,使其能夠加載并記錄plist文件數據.
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;
//記錄行高,取出cell中高度的最大值來賦值
@property(nonatomic,assign) CGFloat cellHeight;
//記錄發送時間是否顯示
@property(nonatomic,assign,getter=isHideTime) BOOL hideTime;
//構造方法,方便外界傳入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文件中新建模型類成員屬性,在.m中重寫set方法,將數據傳給子控件
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 ()
/** 獲得成員變量 */
@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
/** 設置自動換行 */
-(void)awakeFromNib
{
self.ButtonLable.titleLabel.numberOfLines=0;
self.otherButtonLable.titleLabel.numberOfLines=0;
}
/** 設置模型的值給成員變量 */
-(void)setMessage:(Message *)message
{
_message=message;
if (message.hideTime) { // 隱藏時間
self.timeLabel.hidden = YES;
[self.timeLabel updateConstraints:^(MASConstraintMaker *make) {
make.height.equalTo(0);
}];
} else { // 顯示時間
self.timeLabel.text = message.time;
self.timeLabel.hidden = NO;
[self.timeLabel updateConstraints:^(MASConstraintMaker *make) {
make.height.equalTo(21);
}];
}
//根據模型的type設置顯示哪一邊的cell,并設置內容
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];
//強制更新,確保數值更新
[showButton layoutIfNeeded];
//設置button的高度與label相同
[showButton updateConstraints:^(MASConstraintMaker *make) {
CGFloat ButtonH=showButton.titleLabel.frame.size.height + 30;
make.height.equalTo(ButtonH);
}];
//強制更新,確保數值更新
[showButton layoutIfNeeded];
//獲取button與nameView的最大值,設置最大值為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中新建數組,加載模型數據,同時實現tableView的數據源方法,需遵守UITableViewDataSource,UITableViewDelegate協議.
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 - 懶加載
-(NSArray *)messages
{
if (_messages==nil) {
NSString *path=[[NSBundle mainBundle] pathForResource:@"messages.plist" ofType:nil];
NSArray *dictArray=[NSArray arrayWithContentsOfFile:path];
NSMutableArray *messageArr=[NSMutableArray array];
//定義一個模型接收上一次的時間
Message *lastMessage = nil;
for (NSDictionary *dict in dictArray) {
Message *message=[Message messageWithDict:dict];
//比較兩次的時間是否相同,返回BOOL值
message.hideTime = [lastMessage.time isEqualToString:message.time];
[messageArr addObject:message];
記錄上一個遍歷出來的模型
lastMessage = message;
}
_messages=messageArr;
}
return _messages;
}
- (void)viewDidLoad {
[super viewDidLoad];
}
#pragma mark - 設置cell
/** 設置cell數 */
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.messages.count;
}
/** 設置每行cell顯示的內容 */
-(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;
}
/** 設置cell的虛擬行高 */
-(CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 200;
}
@end
