iphone开发之iphone解析xml&json-1

解析XML文件示例.

代码1和代码2是IOS开发的基本内容。

代码1.

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#import <UIKit/UIKit.h>
  
@ class XmlTestViewController;
  
@interface XmlTestAppDelegate : NSObject <UIApplicationDelegate> {
     UIWindow *window;
     XmlTestViewController *viewController;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain) IBOutlet XmlTestViewController *viewController;
  
@end

 

  代码2

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 1 #import "XmlTestAppDelegate.h"
2 #import "XmlTestViewController.h"
3 @implementation XmlTestAppDelegate
4 @synthesize window;
5 @synthesize viewController;
6 #pragma mark -
7 #pragma mark Application lifecycle
8 - (BOOL)application:(UIApplication *)application
9 didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
10 [window addSubview:viewController.view];
11 [window makeKeyAndVisible];
12 return YES;
13 }
14 - (void)applicationWillResignActive:(UIApplication *)application {}
15 - (void)applicationDidEnterBackground:(UIApplication *)application {}
16 - (void)applicationWillEnterForeground:(UIApplication *)application {}
17 - (void)applicationDidBecomeActive:(UIApplication *)application {}
18 - (void)applicationWillTerminate:(UIApplication *)application {}
19 - (void)applicationDidReceiveMemoryWarning:(UIApplication *)application {}
20 - (void)dealloc {
21 [viewController release];
22 [window release];
23 [super dealloc];
24 }
25 @end
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代码3是controller的头文件。

 代码3

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#import <UIKit/UIKit.h>
  
@interface XmlTestViewController : UIViewController {
}
@end

  controller的实现文件。在这声明了一个xml格式,NSString类型的字符串。并用代码5和代码6定义的类解析。

  代码4

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#import "XmlTestViewController.h"
#import "FirstXmlParse.h"
@implementation XmlTestViewController

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
NSString *xml=@"<xml>"
"<title>标题</title>"
"<content>内容描述</content>"
"<time>2011-1-1</time>"
"</xml>";

FirstXmlParse *first=[[FirstXmlParse alloc] init];
[first startParse:xml];
NSLog(@"title:%@",first.title);
NSLog(@"content:%@",first.content);
NSLog(@"time:%@",first.time);
}

/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/

- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}

- (void)viewDidUnload {
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}

- (void)dealloc {
[super dealloc];
}
@end
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 代码5

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#import <Foundation/Foundation.h>
  
@interface FirstXmlParse : NSObject<NSXMLParserDelegate> {
     NSString *title;
     NSString *content;
     NSString * time ;
     //定义一个可变字符串
     NSMutableString *contentString;
}
@property(nonatomic,retain)NSString *title;
@property(nonatomic,retain)NSString *content;
@property(nonatomic,retain)NSString * time ;
@property(nonatomic,retain)NSMutableString *contentString;
-( void )startParse:(NSString *)xml;
@end

  代码6.这是解析xml文件的关键内容。

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#import "FirstXmlParse.h"

@implementation FirstXmlParse
@synthesize title;
@synthesize content;
@synthesize time;
@synthesize contentString;

-(void)startParse:(NSString *)xml{
NSData *data=[xml dataUsingEncoding:NSUTF8StringEncoding];
//创建xml解析器
NSXMLParser *xmlParse=[[NSXMLParser alloc] initWithData:data];
//设置委托
[xmlParse setDelegate:self];
[xmlParse parse];
}

//解析文档开始
- (void)parserDidStartDocument:(NSXMLParser *)parser{
NSLog(@"解析文档开始");
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
NSLog(@"遇到启始标签:%@",elementName);
self.contentString=[NSMutableString string];
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
NSLog(@"遇到内容:%@",string);
[self.contentString appendString:string];
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
NSLog(@"遇到结束标签:%@",elementName);
if ([elementName isEqualToString:@"title"]) {
title=contentString;
}
if ([elementName isEqualToString:@"content"]) {
content=contentString;
}
if ([elementName isEqualToString:@"time"]) {
time=contentString;
}
}

//解析文档结束
- (void)parserDidEndDocument:(NSXMLParser *)parser{
NSLog(@"文档解析结束");
}
@end

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