[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

https://github.com/robbiehanson/KissXML

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

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

FirstViewController.m

#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

这里面最重要的就是解析返回的XML数据，代码里面的注释也写得比较详细了，我想大家也应该能看得懂，取得数据后我们就可以显示在AQGridView中去了。这个内容我们放到第三篇中做详细介绍。