[iPhone中级]iPhone团购信息客户端的开发 (2)

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

#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。