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ilikeido
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BeeFramework 系列三 MVC篇上

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     这两天死了不少人,南北呼应。厦门的兄弟们别挤brt了,公交有风险,挤车需谨慎!

    继续介绍Bee的mvc,框架中已经为MVC做了一定程度的封装,我们查看Bee的源码会发现对应着BeeController、BeeModel以及各种常用的View和ViewController,另外ViewLayout添加了View界面布局的灵活性,从v0.3.0版本开始更是加入了基于XML的UI模板模块。
   
    还是先上个例子比较直观些。
   
    这个例子,通过访问国家气象局天气预报JSON数据接口,http://www.weather.com.cn/data/sk/101010100.html,返回天气数据。
    看下目录结构
   
    把MVC分离出来放到不同的目录下。
    Model层代码:
   
//
//  WeatherModel.h
//  BeeFrameWorkTest
//
//  Created by he songhang on 13-6-8.
//  Copyright (c) 2013年 he songhang. All rights reserved.
//

#import <BeeFramework/Bee.h>

@interface Weather : BeeActiveRecord

@property(nonatomic,strong) NSString *city;//城市
@property(nonatomic,strong) NSString *temp;//气温
@property(nonatomic,strong) NSString *WD;//风向
@property(nonatomic,strong) NSString *WS;//风力
@property(nonatomic,strong) NSString *time;//发布时间

@end

@interface WeatherModel : BeeModel

@property(nonatomic,strong) Weather *weather;

-(void)loadOnline;//查询天气

-(void)loadCache;//读取历史记录

@end


//
//  WeatherModel.m
//  BeeFrameWorkTest
//
//  Created by he songhang on 13-6-8.
//  Copyright (c) 2013年 he songhang. All rights reserved.
//

#import "WeatherModel.h"
#import "WeatherController.h"

@implementation Weather

+(void)mapRelation{
    [super mapPropertyAsKey:@"city"];
    [super mapRelation];
}

@end

@interface WeatherModel (private)

- (void)saveCache;
- (void)asyncSaveCache;

@end

@implementation WeatherModel

-(void)loadOnline{
    [self sendMessage:WeatherController.LOAD_WEATHER];
}

-(void)loadCache{
    int count = Weather.DB.WHERE(@"city",@"北京").COUNT().resultCount;
    if (count>0) {
        self.weather = [Weather.DB.WHERE(@"city",@"北京").GET_RECORDS() lastObject];
    }
}

- (void)saveCache
{
	[NSObject cancelPreviousPerformRequestsWithTarget:self];
	[self performSelector:@selector(asyncSaveCache) withObject:nil afterDelay:0.1f];
}


- (void)asyncSaveCache
{
	_weather.SAVE();
}

- (void)handleMessage:(BeeMessage *)msg
{
	[super handleMessage:msg];
}

- (void)handleWeatherController:(BeeMessage *)msg
{
	if ( [msg is:WeatherController.LOAD_WEATHER] )
	{
		if ( msg.succeed )
		{
			NSDictionary *dict = [msg.output dictAtPath:@"result"];
            if (dict) {
                self.weather = (Weather *)[dict objectForClass:[Weather class]];
                [self saveCache];
            }
            
		}
	}
    [super handleMessage:msg];
}

@end

     在.h中定义了一个Weather的实体,与天气数据对应,用到了BeeActiveRecord,这是Bee中的ORM框架,实现数据库与BeeActiveRecord的序列和反序列化。通常我们在做离线缓存时采用CoreData,bee采用的是DB的方式。感谢老郭为我们封装了原来的SQL语法,免去了封装枯燥的SQL语句。查看BeeActiveRecord的父类BeeDatabase,可以看到一些开源软件上用的很欢的以Block为参数的写法。
     在.m中通过
[self sendMessage:WeatherController.LOAD_WEATHER];
向Weathercontroller发送了一个LOAD_WEATHER的请求,在handleWeatherController中响应BeeMessage的不同状态,并完成离线数据的保存工作
[self saveCache];


      再上Controller的实现
//
//  WeatherController.h
//  BeeFrameWorkTest
//
//  Created by he songhang on 13-6-8.
//  Copyright (c) 2013年 he songhang. All rights reserved.
//

#import "Bee_Controller.h"

@interface WeatherController : BeeController

AS_MESSAGE(LOAD_WEATHER)

@end


//
//  WeatherController.m
//  BeeFrameWorkTest
//
//  Created by he songhang on 13-6-8.
//  Copyright (c) 2013年 he songhang. All rights reserved.
//

#import "WeatherController.h"
#import "JSONKit.h"
#import <BeeFramework/Bee.h>

@implementation WeatherController

DEF_MESSAGE(LOAD_WEATHER)

-(void)LOAD_WEATHER:(BeeMessage *)msg{
    if ( msg.sending )
	{
		NSString * callURL = @"http://www.weather.com.cn/data/sk/101010100.html" ;
		msg.HTTP_GET( callURL );
	}
	else if ( msg.progressed )
	{
        
	}
	else if ( msg.succeed )
	{
		NSDictionary * jsonData = [msg.response objectFromJSONData];
		if ( nil == jsonData )
		{
			[msg setLastError];
			return;
		}
        
        NSDictionary *weatherinfo = (NSDictionary *)[jsonData objectAtPath:@"weatherinfo"];
		        
		[msg output:@"result", weatherinfo, nil];
	}
	else if ( msg.failed )
	{
		
	}
	else if ( msg.cancelled )
	{
	}
}

@end

     WeatherController完成与天气预报服务器交互的工作,和UISignle类似,在.h中通过AS_MESSAGE(LOAD_WEATHER)定义了一个LOAD_WEATHER的方法声明,在.m中用DEF_MESSAGE(LOAD_WEATHER)对应,并完成LOAD_WEATHER的方法实现。在bee中网络层使用的是ASIHTTPRequest框架,至于为什么不用AFNetworking,这实际上是个人习惯的问题,虽然ASIHTTPRequest已经N久没更新过了,不过也够用了。BeeMessage中对ASIHTTPRequest做了很多工作,通过BeeRequestQueue,对post和get过程中状态的分离。

    再来看view层,其实在这个例子中做真正做逻辑的是ViewController,注意它的父类为BeeUIBoard,正是这个类做了UIMessage的消息转发,还实现了ViewController生命周期中的UISignal化。
//
//  ViewController.h
//  BeeFrameWorkTest
//
//  Created by he songhang on 13-6-3.
//  Copyright (c) 2013年 he songhang. All rights reserved.
//

#import <UIKit/UIKit.h>
#import <BeeFramework/Bee.h>
#import "WeatherModel.h"

@interface ViewController : BeeUIBoard{
    __strong WeatherModel *_weatherModel;
    __weak IBOutlet UITextView *textView;
}

@end


//
//  ViewController.m
//  BeeFrameWorkTest
//
//  Created by he songhang on 13-6-3.
//  Copyright (c) 2013年 he songhang. All rights reserved.
//

#import "ViewController.h"
#import "WeatherController.h"

@implementation ViewController

-(void)load{
    _weatherModel = [[WeatherModel alloc]init];
    [_weatherModel addObserver:self];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void)handleUISignal:(BeeUISignal *)signal
{
	[super handleUISignal:signal];
}

- (void)handleUISignal_BeeUIBoard:(BeeUISignal *)signal
{
	[super handleUISignal:signal];
    
	if ( [signal is:BeeUIBoard.CREATE_VIEWS] )
	{
		[self showNavigationBarAnimated:YES];
        [self showBarButton:UINavigationBar.BARBUTTON_RIGHT system:UIBarButtonSystemItemRefresh];
        self.title = @"天气预报";
	}
	else if ( [signal is:BeeUIBoard.DELETE_VIEWS] )
	{
	}
	else if ( [signal is:BeeUIBoard.LOAD_DATAS] )
	{
		[_weatherModel loadCache];
        [self refushTextView];
	}
	else if ( [signal is:BeeUIBoard.WILL_APPEAR] )
	{
		
	}
	else if ( [signal is:BeeUIBoard.DID_DISAPPEAR] )
	{
	}
}

- (void)handleUISignal_UINavigationBar:(BeeUISignal *)signal
{
	if ( [signal is:UINavigationBar.BACK_BUTTON_TOUCHED] )
	{
	}
	else if ( [signal is:UINavigationBar.DONE_BUTTON_TOUCHED] )
	{
		[self loadOnline];
	}
}

-(void)loadOnline{
    [_weatherModel loadOnline];
}

-(void)refushTextView{
    if (_weatherModel.weather) {
        Weather *weather = _weatherModel.weather;
        NSString *weatherInfo = [NSString stringWithFormat:@"城市:%@\n气温:%@\n风向:%@\n风力%@\n发布时间:%@,",weather.city,weather.temp,weather.WD,weather.WS,weather.time];
        textView.text = weatherInfo;
    }
}

- (void)handleMessage:(BeeMessage *)msg
{
	[super handleMessage:msg];
}

- (void)handleWeatherController:(BeeMessage *)msg
{
	[super handleMessage:msg];
    
	if ( [msg is:WeatherController.LOAD_WEATHER] )
	{
		if ( msg.sending )
		{
			BeeUIActivityIndicatorView * indicator = [BeeUIActivityIndicatorView spawn];
			[self showBarButton:UINavigationBar.BARBUTTON_RIGHT custom:indicator];
			[indicator startAnimating];
		}
		else
		{
			[self showBarButton:UINavigationBar.BARBUTTON_RIGHT system:UIBarButtonSystemItemRefresh];
		}

        
        if ( msg.succeed )
		{
			[self refushTextView];
		}
	}
}

@end




     这里应注意ViewController.m中的代码:
-(void)load{
    _weatherModel = [[WeatherModel alloc]init];
    [_weatherModel addObserver:self];//注意点!!!
}
,结合WeatherModel.m中的
- (void)handleWeatherController:(BeeMessage *)msg
{
	if ( [msg is:WeatherController.LOAD_WEATHER] )
	{
		if ( msg.succeed )
		{
			NSDictionary *dict = [msg.output dictAtPath:@"result"];
            if (dict) {
                self.weather = (Weather *)[dict objectForClass:[Weather class]];
                [self saveCache];
            }
            
		}
	}
    [super handleMessage:msg];//注意点
}

     如果把
[super handleMessage:msg];
去掉,那么ViewController中的handleMessage和handleWeatherController将无法响应。
    
     本篇通过天气预报介绍了Bee中的MVC的实现场景,当然你也可以根据自己的需要选择适用的模块,你可以在Model中直接实现网络层交互,也可以去掉model层,直接在UIBoard中调用BeeController,怎么选择还是看个人习惯。
    
     以上代码下载:https://github.com/ilikeido/BeeFrameworkTest/tree/master/lesson4
    
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