ios 团购信息客户端demo(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。