还有另一种使用 KMLReader 解析 xml 的方法。你直接从中得到字典。
您必须导入这些文件并从 KMLReader 文件中调用 Dictionary For XMLData 方法，然后直接从中获取解析字典。只需导入此类
KMLReader.h
#import <Foundation/Foundation.h>
@interface KMLReader : NSObject <NSXMLParserDelegate>
{
NSMutableArray *dictionaryStack;
NSMutableString *textInProgress;
NSError **errorPointer;
}
+ (NSDictionary *)dictionaryForPath:(NSString *)path error:(NSError **)errorPointer;
+ (NSDictionary *)dictionaryForXMLData:(NSData *)data error:(NSError **)errorPointer;
+ (NSDictionary *)dictionaryForXMLString:(NSString *)string error:(NSError **)errorPointer;
@end
@interface NSDictionary (XMLReaderNavigation)
- (id)retrieveForPath:(NSString *)navPath;
@end
KMLReader.m
#import "KMLReader.h"
NSString *const kKMLReaderTextNodeKey = @"text";
@interface KMLReader (Internal)
- (id)initWithError:(NSError **)error;
- (NSDictionary *)objectWithData:(NSData *)data;
@end
@implementation NSDictionary (KMLReaderNavigation)
- (id)retrieveForPath:(NSString *)navPath
{
// Split path on dots
NSArray *pathItems = [navPath componentsSeparatedByString:@"."];
// Enumerate through array
NSEnumerator *e = [pathItems objectEnumerator];
NSString *path;
// Set first branch from self
id branch = [self objectForKey:[e nextObject]];
int count = 1;
while ((path = [e nextObject]))
{
NSLog(@"%@",path);
// Check if this branch is an NSArray
if([branch isKindOfClass:[NSArray class]])
{
if ([path isEqualToString:@"last"])
{
branch = [branch lastObject];
}
else
{
if ([branch count] > [path intValue])
{
branch = [branch objectAtIndex:[path intValue]];
}
else
{
branch = nil;
}
}
}
else
{
// branch is assumed to be an NSDictionary
branch = [branch objectForKey:path];
}
count++;
}
return branch;
}
@end
@implementation KMLReader
#pragma mark -
#pragma mark Public methods
+ (NSDictionary *)dictionaryForPath:(NSString *)path error:(NSError **)errorPointer
{
NSLog(@"path :: %@",path);
//NSString *fullpath = [[NSBundle bundleForClass:self] pathForResource:path ofType:@"xml"];
if ([path length]!=0) {
NSString *fullpath = [[NSBundle bundleForClass:self] pathForResource:path ofType:@"kml"];
NSLog(@"full path :: %@",fullpath);
NSData *data = [[NSFileManager defaultManager] contentsAtPath:fullpath];
NSDictionary *rootDictionary = [KMLReader dictionaryForXMLData:data error:errorPointer];
NSLog(@"rootDictionary == %@",rootDictionary.description);
return rootDictionary;
}
else
{
return nil;
}
}
+ (NSDictionary *)dictionaryForXMLData:(NSData *)data error:(NSError **)error
{
KMLReader *reader = [[KMLReader alloc] initWithError:error];
// NSData *data1 = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://local.yahooapis.com/LocalSearchService/V3/localSearch?appid=YahooDemo&query=pizza&zip=94306&results=1&output=xml"]];
NSData *data1 = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.ibtimes.com/rss/articles/reporters/david-zielenziger.rss"]];
NSDictionary *rootDictionary = [reader objectWithData:data1];
[reader release];
NSLog(@"ROOT DICTIONARY :: %@",rootDictionary.description);
return rootDictionary;
}
+ (NSDictionary *)dictionaryForXMLString:(NSString *)string error:(NSError **)error
{
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
return [KMLReader dictionaryForXMLData:data error:error];
}
#pragma mark -
#pragma mark Parsing
- (id)initWithError:(NSError **)error
{
if ((self = [super init]))
{
errorPointer = error;
}
return self;
}
- (void)dealloc
{
[dictionaryStack release];
[textInProgress release];
[super dealloc];
}
- (NSDictionary *)objectWithData:(NSData *)data
{
// Clear out any old data
[dictionaryStack release];
[textInProgress release];
dictionaryStack = [[NSMutableArray alloc] init];
textInProgress = [[NSMutableString alloc] init];
// Initialize the stack with a fresh dictionary
[dictionaryStack addObject:[NSMutableDictionary dictionary]];
// Parse the XML
NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
parser.delegate = self;
BOOL success = [parser parse];
[parser release];
// Return the stack's root dictionary on success
if (success)
{
NSDictionary *resultDict = [dictionaryStack objectAtIndex:0];
return resultDict;
}
return nil;
}
#pragma mark -
#pragma mark NSXMLParserDelegate methods
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
// Get the dictionary for the current level in the stack
NSMutableDictionary *parentDict = [dictionaryStack lastObject];
// Create the child dictionary for the new element
NSMutableDictionary *childDict = [NSMutableDictionary dictionary];
// Initialize child dictionary with the attributes, prefixed with '@'
for (NSString *key in attributeDict) {
[childDict setValue:[attributeDict objectForKey:key]
forKey:[NSString stringWithFormat:@"@%@", key]];
}
// If there's already an item for this key, it means we need to create an array
id existingValue = [parentDict objectForKey:elementName];
if (existingValue)
{
NSMutableArray *array = nil;
if ([existingValue isKindOfClass:[NSMutableArray class]])
{
// The array exists, so use it
array = (NSMutableArray *) existingValue;
}
else
{
// Create an array if it doesn't exist
array = [NSMutableArray array];
[array addObject:existingValue];
// Replace the child dictionary with an array of children dictionaries
[parentDict setObject:array forKey:elementName];
}
// Add the new child dictionary to the array
[array addObject:childDict];
}
else
{
// No existing value, so update the dictionary
[parentDict setObject:childDict forKey:elementName];
}
// Update the stack
[dictionaryStack addObject:childDict];
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
// Update the parent dict with text info
NSMutableDictionary *dictInProgress = [dictionaryStack lastObject];
// Pop the current dict
[dictionaryStack removeLastObject];
// Set the text property
if ([textInProgress length] > 0)
{
if ([dictInProgress count] > 0)
{
[dictInProgress setObject:textInProgress forKey:kKMLReaderTextNodeKey];
}
else
{
// Given that there will only ever be a single value in this dictionary, let's replace the dictionary with a simple string.
NSMutableDictionary *parentDict = [dictionaryStack lastObject];
id parentObject = [parentDict objectForKey:elementName];
// Parent is an Array
if ([parentObject isKindOfClass:[NSArray class]])
{
[parentObject removeLastObject];
[parentObject addObject:textInProgress];
}
// Parent is a Dictionary
else
{
[parentDict removeObjectForKey:elementName];
[parentDict setObject:textInProgress forKey:elementName];
}
}
// Reset the text
[textInProgress release];
textInProgress = [[NSMutableString alloc] init];
}
// If there was no value for the tag, and no attribute, then remove it from the dictionary.
else if ([dictInProgress count] == 0)
{
NSMutableDictionary *parentDict = [dictionaryStack lastObject];
[parentDict removeObjectForKey:elementName];
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
// Build the text value
[textInProgress appendString:[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]];
}
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError
{
// Set the error pointer to the parser's error object
if (errorPointer)
*errorPointer = parseError;
}
@end