[iPhone中级]iPhone团购信息客户端的开发 (二)

接上一篇，这篇我们对我们的客户端加入KissXML,MBProgressHUD,AQridView这几个库,首先我们先加入KissXML，这是XML解析库，支持Xpath，可以方便添加更改任何节点。先从官方网站上下载KissXML这个库

接下来，将KissXML库中的KissXML文件夹拷入我们的工程中,如图

然后跟上次一样，我们通过File/Add File to "Tuan1"这个选项加入到我们的工程中，我们以同样的方法分别加入MBProgressHUD和AGridView这两个库

在Framework中加入QuartzCore.framework，因为AGridView需要用到。
 

接着我们在代码中加入

#import"MBProgressHUD.h"

#import"DDXML.h"

这二行，运行一下，如果没有报错的话，那这几个库我们就加入成功了。

接着我们更改一下storybord,将FirstViewController这个视图加入NavigationController，选中FirstViewController在主菜单Editor/Embed In/Navigation Controller，系统自动为我们加入NavigationController。
 

下面，我们将FirstViewController中清空，所有内容都删除

好了，到这一步，我们的视图基本都完成了，接下来就是编码了,首先我们来解析美团网团购信息

FirstViewController.h

[plain]
#import <UIKit/UIKit.h> 
#import "ASIHTTPRequest.h" 
   
@interface KKFirstViewController : UIViewController<ASIHTTPRequestDelegate> 
 
 
@end 
#import <UIKit/UIKit.h>
#import "ASIHTTPRequest.h"

@interface KKFirstViewController : UIViewController<ASIHTTPRequestDelegate>

@end

FirstViewController.m

[plain]
#import "KKFirstViewController.h" 
#import "MBProgressHUD.h" 
#import "DDXML.h" 
#import "DDXMLElementAdditions.h" 
 
@interface KKFirstViewController (){ 
     
    MBProgressHUD *hud; 
    NSMutableArray *arrays; 
     
} 
 
@end 
 
@implementation KKFirstViewController 
 
- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
     
    self.navigationItem.title = @"美团"; 
    //背景 
    UIImage *bgImage = [UIImage imageNamed:@"bg-app.png"]; 
    self.view.backgroundColor = [UIColor colorWithPatternImage:bgImage]; 
    //HUD提示框 
    hud = [[MBProgressHUD alloc] init]; 
    hud.labelText = @"载入数据..."; 
    //网址 
    NSString *urlString = @"http://www.meituan.com/api/v2/beijing/deals"; 
     
    [hud showWhileExecuting:@selector(startHttpRequest:) onTarget:self withObject:urlString animated:YES]; 
    //因为hud需要显示在最前面，所以我们在NavigationController中加入 
    [self.navigationController.view addSubview:hud]; 
     
    arrays = [NSMutableArray array]; 
} 
 
//请求URL 
-(void)startHttpRequest:(NSString *)url{ 
     
    ASIHTTPRequest *httpRequest = [[ASIHTTPRequest alloc] initWithURL:[NSURL URLWithString:url]]; 
     
    httpRequest.delegate = self; 
     
    [httpRequest startSynchronous]; 
     
} 
 
- (void)viewDidUnload 
{ 
    [super viewDidUnload]; 
    // Release any retained subviews of the main view. 
} 
 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); 
} 
 
 
//请求结束 
-(void)requestFinished:(ASIHTTPRequest *)request{ 
    //移除提示框 
    [hud removeFromSuperview]; 
    //返回解析后的数据，每一个Array包括一个字典 
    arrays = [self xmlParser:[request responseData]]; 
     
    NSLog(@"%@", arrays); 
     
} 
 
//解析结点 
static NSString *kXPath_Item = @"//data"; 
static NSString *kName_Deal = @"deal"; 
static NSString *kName_Title = @"deal_title"; 
static NSString *kName_Url = @"deal_url"; 
static NSString *kName_Img = @"deal_img"; 
static NSString *kName_Desc = @"deal_desc"; 
static NSString *kName_Tips = @"deal_tips"; 
 
//XML解析 
-(NSMutableArray *)xmlParser:(NSData *)data{ 
     
    NSMutableArray *array = [NSMutableArray array]; 
    //文档开始 
    DDXMLDocument *xmlDoc = [[DDXMLDocument alloc] initWithData:data options:0 error:nil]; 
    //返回<data>中的所有元素 
    NSArray *items = [xmlDoc nodesForXPath:kXPath_Item error:nil]; 
    //遍历每个元素 
    for (DDXMLElement *item in items) { 
         
        NSMutableDictionary *dict = [NSMutableDictionary dictionary]; 
        //返回<deal>中的所有元素 
        NSArray *deals = [item elementsForName:kName_Deal]; 
         
        for (DDXMLElement *deal in deals) { 
            //<deal_title> 
            DDXMLElement *title = [deal elementForName:kName_Title]; 
            if (title) { 
                [dict setObject:[title stringValue] forKey:kName_Title]; 
            } 
            //<deal_url> 
            DDXMLElement *url = [deal elementForName:kName_Url]; 
            if (url) { 
                [dict setObject:[url stringValue] forKey:kName_Url]; 
            } 
            //<deal_img> 
            DDXMLElement *img = [deal elementForName:kName_Img]; 
            if (img) { 
                [dict setObject:[img stringValue] forKey:kName_Img]; 
            } 
            //<deal_desc> 
            DDXMLElement *desc = [deal elementForName:kName_Desc]; 
            if (desc) { 
                [dict setObject:[desc stringValue] forKey:kName_Desc]; 
            } 
            //<deal_tips> 
            DDXMLElement *tips = [deal elementForName:kName_Tips]; 
            if (tips) { 
                [dict setObject:[tips stringValue] forKey:kName_Tips]; 
            } 
             
        } 
        [array addObject:dict]; 
    } 
     
    return array; 
     
} 
 
//请求中止（出错） 
-(void)requestFailed:(ASIHTTPRequest *)request{ 
     
    [hud removeFromSuperview]; 
     
    NSError *error = [request error]; 
     
    NSLog(@"RequestError : %@", [error description]); 
     
} 
 
@end 
作者：kangkangz4