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.

#import 
     
      @class XmlTestViewController;@interface XmlTestAppDelegate : NSObject 
      
        {    UIWindow *window;    XmlTestViewController *viewController;}@property (nonatomic, retain) IBOutlet UIWindow *window;@property (nonatomic, retain) IBOutlet XmlTestViewController *viewController;@end
      
     

 

　　代码2

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

代码3是controller的头文件。

　代码3

#import 
     
      @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

#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=@"
     
      " "
      " "
      
       内容描述
      " "
      2011-1-1" "
     ";     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

 

　代码5

#import 
     
      @interface FirstXmlParse : NSObject
      
        {    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。

#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