** 準(zhǔn)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(shè)置上面cell的重用標(biāo)識(shí)為messageMe,下面cell的重用標(biāo)識(shí)為messageOther.
- 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,設(shè)置控件的圖片等屬性,并設(shè)置控制器為tableView的數(shù)據(jù)源和代理.
如下圖:
設(shè)置控件
設(shè)置數(shù)據(jù)源和代理
2.通過(guò)autoLayout設(shè)置每個(gè)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(nèi)容長(zhǎng)度變化,從而也就決定了button的寬度長(zhǎng)短.在自定義cell類的awakeFromNib方法中設(shè)置button中titleLabel的numberOfLines為零,這樣就實(shí)現(xiàn)了Button內(nèi)容的自動(dòng)換行功能.
- (void)awakeFromNib{
//設(shè)置titleLabel達(dá)到button最大寬度時(shí)自動(dòng)換行
self.messageButton.titleLabel.numberOfLines = 0;
}
3.將控件連線DLMessageCell類擴(kuò)展中.不同cell可以將相同的屬性共用.
連線控件
4.創(chuàng)建DLmessage模型中的成員屬性,使其能夠加載并記錄plist文件數(shù)據(jù).
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(lái)賦值
@property(nonatomic,assign) CGFloat cellHeight;
//記錄發(fā)送時(shí)間是否顯示
@property(nonatomic,assign,getter=isHideTime) BOOL hideTime;
//構(gòu)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(xiě)set方法,將數(shù)據(jù)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 DLMessageCell ()
@property (weak, nonatomic) IBOutlet UILabel *timeLabel;
@property (weak, nonatomic) IBOutlet UIButton *messageButton;
@property (weak, nonatomic) IBOutlet UIImageView *iconView;
@end
@implementation DLMessageCell
- (void)awakeFromNib{
//設(shè)置換行
self.messageButton.titleLabel.numberOfLines = 0;
}
- (void)setMessage:(DLMessage *)message{
_message = message;
//隱藏時(shí)間
if (message.hideTime) {
self.timeLabel.hidden = YES;
[self.timeLabel updateConstraints:^(MASConstraintMaker *make) {
make.height.equalTo(0);
}];
}else{//顯示時(shí)間
self.timeLabel.hidden = NO;
self.timeLabel.text = message.time;
[self.timeLabel updateConstraints:^(MASConstraintMaker *make) {
make.height.equalTo(21);
}];
}
//設(shè)置控件內(nèi)容
[self.messageButton setTitle:self.message.text forState:UIControlStateNormal];
//強(qiáng)制更新
[self layoutIfNeeded];
//修改button的高度
[self.messageButton updateConstraints:^(MASConstraintMaker *make) {
CGFloat buttonH = self.messageButton.titleLabel.frame.size.height + 30;
make.height.equalTo(buttonH);
}];
[self layoutIfNeeded];
//獲取button與nameView的最大值,設(shè)置最大值為cell的高度
CGFloat buttonY = CGRectGetMaxY(self.messageButton.frame);
CGFloat iconViewY = CGRectGetMaxY(self.iconView.frame);
self.message.cellHeight = MAX(buttonY, iconViewY) + 5;
}
@end
6.在DLMessageViewController中新建數(shù)組,加載模型數(shù)據(jù),同時(shí)實(shí)現(xiàn)tableView的數(shù)據(jù)源方法,需遵守UITableViewDataSource,UITableViewDelegate協(xié)議.
#import "DLMessageViewController.h"
#import "DLMessageCell.h"
#import "DLMessage.h"
@interface DLMessageViewController ()<UITableViewDataSource,UITableViewDelegate>
@property(nonatomic,strong) NSArray *messages;
@property (weak, nonatomic) IBOutlet UITextField *messageFeild;
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *buttomSpacing;
@end
@implementation DLMessageViewController
- (NSArray *)messages{
if (_messages == nil) {
NSString *path = [[NSBundle mainBundle] pathForResource:@"messages.plist" ofType:nil];
NSArray *dictArr = [NSArray arrayWithContentsOfFile:path];
NSMutableArray *messageArrM = [NSMutableArray array];
DLMessage *lastMessage = nil;
for (NSDictionary *dict in dictArr) {
DLMessage *message = [DLMessage messageWithDict:dict];
message.hideTime = [lastMessage.time isEqualToString:message.time];
[messageArrM addObject:message];
lastMessage = message;
}
_messages = messageArrM;
}
return _messages;
}
- (void)viewDidLoad {
[super viewDidLoad];
}
//返回cell的行數(shù)
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return self.messages.count;
}
//設(shè)置cell的數(shù)據(jù)
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
//取出模型的數(shù)據(jù)
DLMessage *message = self.messages[indexPath.row];
/*根據(jù)模型中type的值來(lái)設(shè)置數(shù)據(jù)(方法1)
DLMessageCell *cell = [[DLMessageCell alloc] init];
if (message.type == DLMessageTypeMe) {
cell = [tableView dequeueReusableCellWithIdentifier:@"messageMe"];
}else if(message.type == DLMessageTypeOther){
cell = [tableView dequeueReusableCellWithIdentifier:@"messageOther"];
}
cell.message = self.messages[indexPath.row];
return cell;
*/
// 根據(jù)模型中type的值來(lái)設(shè)置數(shù)據(jù)(方法2)
NSString *ID = (message.type == DLMessageTypeMe)? @"messageMe" : @"messageOther";
DLMessageCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
cell.message = message;
return cell;
}
//返回cell的估計(jì)高度
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath{
return 200;
}
//返回cell的高度
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
DLMessage *message = self.messages[indexPath.row];
return message.cellHeight;
}
