Xml parsing in iOS tutorial [closed]

You can parse XML with below code. But you must need to create classes which you can find below.

    NSURL *URL = [[NSURL alloc] initWithString:@"http:/sites.google.com/site/iphonesdktutorials/xml/Books.xml"];    NSString *xmlString = [[NSString alloc] initWithContentsOfURL:URL encoding:NSUTF8StringEncoding error:NULL];    NSLog(@"string: %@", xmlString);    NSDictionary *xmlDoc = [NSDictionary dictionaryWithXMLString:xmlString];    NSLog(@"dictionary: %@", xmlDoc);

You need to create this classes for XML parsing with name of XMLParser.

XMLParser.h

////  XMLParser.h//////  Copyright 2016 Darshan kunjadiya. All rights reserved.#import <Foundation/Foundation.h>#pragma GCC diagnostic push#pragma GCC diagnostic ignored "-Wobjc-missing-property-synthesis"typedef NS_ENUM(NSInteger, XMLDictionaryAttributesMode){    XMLDictionaryAttributesModePrefixed = 0, //default    XMLDictionaryAttributesModeDictionary,    XMLDictionaryAttributesModeUnprefixed,    XMLDictionaryAttributesModeDiscard};typedef NS_ENUM(NSInteger, XMLDictionaryNodeNameMode){    XMLDictionaryNodeNameModeRootOnly = 0, //default    XMLDictionaryNodeNameModeAlways,    XMLDictionaryNodeNameModeNever};static NSString *const XMLDictionaryAttributesKey   = @"__attributes";static NSString *const XMLDictionaryCommentsKey     = @"__comments";static NSString *const XMLDictionaryTextKey         = @"__text";static NSString *const XMLDictionaryNodeNameKey     = @"__name";static NSString *const XMLDictionaryAttributePrefix = @"_";@interface XMLURLParser : NSObject <NSCopying>+ (XMLURLParser *)sharedInstance;@property (nonatomic, assign) BOOL collapseTextNodes; // defaults to YES@property (nonatomic, assign) BOOL stripEmptyNodes;   // defaults to YES@property (nonatomic, assign) BOOL trimWhiteSpace;    // defaults to YES@property (nonatomic, assign) BOOL alwaysUseArrays;   // defaults to NO@property (nonatomic, assign) BOOL preserveComments;  // defaults to NO@property (nonatomic, assign) BOOL wrapRootNode;      // defaults to NO@property (nonatomic, assign) XMLDictionaryAttributesMode attributesMode;@property (nonatomic, assign) XMLDictionaryNodeNameMode nodeNameMode;- (NSDictionary *)dictionaryWithParser:(NSXMLParser *)parser;- (NSDictionary *)dictionaryWithData:(NSData *)data;- (NSDictionary *)dictionaryWithString:(NSString *)string;- (NSDictionary *)dictionaryWithFile:(NSString *)path;@end@interface NSDictionary (XMLParser)+ (NSDictionary *)dictionaryWithXMLParser:(NSXMLParser *)parser;+ (NSDictionary *)dictionaryWithXMLData:(NSData *)data;+ (NSDictionary *)dictionaryWithXMLString:(NSString *)string;+ (NSDictionary *)dictionaryWithXMLFile:(NSString *)path;- (NSDictionary *)attributes;- (NSDictionary *)childNodes;- (NSArray *)comments;- (NSString *)nodeName;- (NSString *)innerText;- (NSString *)innerXML;- (NSString *)XMLString;- (NSArray *)arrayValueForKeyPath:(NSString *)keyPath;- (NSString *)stringValueForKeyPath:(NSString *)keyPath;- (NSDictionary *)dictionaryValueForKeyPath:(NSString *)keyPath;@end@interface NSString (XMLParser)- (NSString *)XMLEncodedString;@end#pragma GCC diagnostic pop

XMLParser.m

////  XMLParser.m//////  Copyright 2016 Darshan kunjadiya. All rights reserved.#import "XMLParser.h"#pragma GCC diagnostic ignored "-Wobjc-missing-property-synthesis"#pragma GCC diagnostic ignored "-Wdirect-ivar-access"#pragma GCC diagnostic ignored "-Wformat-non-iso"#pragma GCC diagnostic ignored "-Wgnu"#import <Availability.h>#if !__has_feature(objc_arc)#error This class requires automatic reference counting#endif@interface XMLURLParser () <NSXMLParserDelegate>@property (nonatomic, strong) NSMutableDictionary *root;@property (nonatomic, strong) NSMutableArray *stack;@property (nonatomic, strong) NSMutableString *text;@end@implementation XMLURLParser+ (XMLURLParser *)sharedInstance{    static dispatch_once_t once;    static XMLURLParser *sharedInstance;    dispatch_once(&once, ^{        sharedInstance = [[XMLURLParser alloc] init];    });    return sharedInstance;}- (id)init{    if ((self = [super init]))    {        _collapseTextNodes = YES;        _stripEmptyNodes = YES;        _trimWhiteSpace = YES;        _alwaysUseArrays = NO;        _preserveComments = NO;        _wrapRootNode = NO;    }    return self;}- (id)copyWithZone:(NSZone *)zone{    XMLURLParser *copy = [[[self class] allocWithZone:zone] init];    copy.collapseTextNodes = _collapseTextNodes;    copy.stripEmptyNodes = _stripEmptyNodes;    copy.trimWhiteSpace = _trimWhiteSpace;    copy.alwaysUseArrays = _alwaysUseArrays;    copy.preserveComments = _preserveComments;    copy.attributesMode = _attributesMode;    copy.nodeNameMode = _nodeNameMode;    copy.wrapRootNode = _wrapRootNode;    return copy;}- (NSDictionary *)dictionaryWithParser:(NSXMLParser *)parser{    [parser setDelegate:self];    [parser parse];    id result = _root;    _root = nil;    _stack = nil;    _text = nil;    return result;}- (NSDictionary *)dictionaryWithData:(NSData *)data{    NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];    return [self dictionaryWithParser:parser];}- (NSDictionary *)dictionaryWithString:(NSString *)string{    NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];    return [self dictionaryWithData:data];}- (NSDictionary *)dictionaryWithFile:(NSString *)path{       NSData *data = [NSData dataWithContentsOfFile:path];    return [self dictionaryWithData:data];}+ (NSString *)XMLStringForNode:(id)node withNodeName:(NSString *)nodeName{       if ([node isKindOfClass:[NSArray class]])    {        NSMutableArray *nodes = [NSMutableArray arrayWithCapacity:[node count]];        for (id individualNode in node)        {            [nodes addObject:[self XMLStringForNode:individualNode withNodeName:nodeName]];        }        return [nodes componentsJoinedByString:@"\n"];    }    else if ([node isKindOfClass:[NSDictionary class]])    {        NSDictionary *attributes = [(NSDictionary *)node attributes];        NSMutableString *attributeString = [NSMutableString string];        for (NSString *key in [attributes allKeys])        {            [attributeString appendFormat:@" %@=\"%@\"", [[key description] XMLEncodedString], [[attributes[key] description] XMLEncodedString]];        }        NSString *innerXML = [node innerXML];        if ([innerXML length])        {            return [NSString stringWithFormat:@"<%1$@%2$@>%3$@</%1$@>", nodeName, attributeString, innerXML];        }        else        {            return [NSString stringWithFormat:@"<%@%@/>", nodeName, attributeString];        }    }    else    {        return [NSString stringWithFormat:@"<%1$@>%2$@</%1$@>", nodeName, [[node description] XMLEncodedString]];    }}- (void)endText{    if (_trimWhiteSpace)    {        _text = [[_text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] mutableCopy];    }    if ([_text length])    {        NSMutableDictionary *top = [_stack lastObject];        id existing = top[XMLDictionaryTextKey];        if ([existing isKindOfClass:[NSArray class]])        {            [existing addObject:_text];        }        else if (existing)        {            top[XMLDictionaryTextKey] = [@[existing, _text] mutableCopy];        }        else        {            top[XMLDictionaryTextKey] = _text;        }    }    _text = nil;}- (void)addText:(NSString *)text{       if (!_text)    {        _text = [NSMutableString stringWithString:text];    }    else    {        [_text appendString:text];    }}- (void)parser:(__unused NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(__unused NSString *)namespaceURI qualifiedName:(__unused NSString *)qName attributes:(NSDictionary *)attributeDict{       [self endText];    NSMutableDictionary *node = [NSMutableDictionary dictionary];    switch (_nodeNameMode)    {        case XMLDictionaryNodeNameModeRootOnly:        {            if (!_root)            {                node[XMLDictionaryNodeNameKey] = elementName;            }            break;        }        case XMLDictionaryNodeNameModeAlways:        {            node[XMLDictionaryNodeNameKey] = elementName;            break;        }        case XMLDictionaryNodeNameModeNever:        {            break;        }    }    if ([attributeDict count])    {        switch (_attributesMode)        {            case XMLDictionaryAttributesModePrefixed:            {                for (NSString *key in [attributeDict allKeys])                {                    node[[XMLDictionaryAttributePrefix stringByAppendingString:key]] = attributeDict[key];                }                break;            }            case XMLDictionaryAttributesModeDictionary:            {                node[XMLDictionaryAttributesKey] = attributeDict;                break;            }            case XMLDictionaryAttributesModeUnprefixed:            {                [node addEntriesFromDictionary:attributeDict];                break;            }            case XMLDictionaryAttributesModeDiscard:            {                break;            }        }    }    if (!_root)    {        _root = node;        _stack = [NSMutableArray arrayWithObject:node];        if (_wrapRootNode)        {            _root = [NSMutableDictionary dictionaryWithObject:_root forKey:elementName];            [_stack insertObject:_root atIndex:0];        }    }    else    {        NSMutableDictionary *top = [_stack lastObject];        id existing = top[elementName];        if ([existing isKindOfClass:[NSArray class]])        {            [existing addObject:node];        }        else if (existing)        {            top[elementName] = [@[existing, node] mutableCopy];        }        else if (_alwaysUseArrays)        {            top[elementName] = [NSMutableArray arrayWithObject:node];        }        else        {            top[elementName] = node;        }        [_stack addObject:node];    }}- (NSString *)nameForNode:(NSDictionary *)node inDictionary:(NSDictionary *)dict{    if (node.nodeName)    {        return node.nodeName;    }    else    {        for (NSString *name in dict)        {            id object = dict[name];            if (object == node)            {                return name;            }            else if ([object isKindOfClass:[NSArray class]] && [object containsObject:node])            {                return name;            }        }    }    return nil;}- (void)parser:(__unused NSXMLParser *)parser didEndElement:(__unused NSString *)elementName namespaceURI:(__unused NSString *)namespaceURI qualifiedName:(__unused NSString *)qName{       [self endText];    NSMutableDictionary *top = [_stack lastObject];    [_stack removeLastObject];    if (!top.attributes && !top.childNodes && !top.comments)    {        NSMutableDictionary *newTop = [_stack lastObject];        NSString *nodeName = [self nameForNode:top inDictionary:newTop];        if (nodeName)        {            id parentNode = newTop[nodeName];            if (top.innerText && _collapseTextNodes)            {                if ([parentNode isKindOfClass:[NSArray class]])                {                    parentNode[[parentNode count] - 1] = top.innerText;                }                else                {                    newTop[nodeName] = top.innerText;                }            }            else if (!top.innerText && _stripEmptyNodes)            {                if ([parentNode isKindOfClass:[NSArray class]])                {                    [parentNode removeLastObject];                }                else                {                    [newTop removeObjectForKey:nodeName];                }            }            else if (!top.innerText && !_collapseTextNodes && !_stripEmptyNodes)            {                top[XMLDictionaryTextKey] = @"";            }        }    }}- (void)parser:(__unused NSXMLParser *)parser foundCharacters:(NSString *)string{    [self addText:string];}- (void)parser:(__unused NSXMLParser *)parser foundCDATA:(NSData *)CDATABlock{    [self addText:[[NSString alloc] initWithData:CDATABlock encoding:NSUTF8StringEncoding]];}- (void)parser:(__unused NSXMLParser *)parser foundComment:(NSString *)comment{    if (_preserveComments)    {        NSMutableDictionary *top = [_stack lastObject];        NSMutableArray *comments = top[XMLDictionaryCommentsKey];        if (!comments)        {            comments = [@[comment] mutableCopy];            top[XMLDictionaryCommentsKey] = comments;        }        else        {            [comments addObject:comment];        }    }}@end@implementation NSDictionary(XMLDictionary)+ (NSDictionary *)dictionaryWithXMLParser:(NSXMLParser *)parser{    return [[[XMLURLParser sharedInstance] copy] dictionaryWithParser:parser];}+ (NSDictionary *)dictionaryWithXMLData:(NSData *)data{    return [[[XMLURLParser sharedInstance] copy] dictionaryWithData:data];}+ (NSDictionary *)dictionaryWithXMLString:(NSString *)string{    return [[[XMLURLParser sharedInstance] copy] dictionaryWithString:string];}+ (NSDictionary *)dictionaryWithXMLFile:(NSString *)path{    return [[[XMLURLParser sharedInstance] copy] dictionaryWithFile:path];}- (NSDictionary *)attributes{    NSDictionary *attributes = self[XMLDictionaryAttributesKey];    if (attributes)    {        return [attributes count]? attributes: nil;    }    else    {        NSMutableDictionary *filteredDict = [NSMutableDictionary dictionaryWithDictionary:self];        [filteredDict removeObjectsForKeys:@[XMLDictionaryCommentsKey, XMLDictionaryTextKey, XMLDictionaryNodeNameKey]];        for (NSString *key in [filteredDict allKeys])        {            [filteredDict removeObjectForKey:key];            if ([key hasPrefix:XMLDictionaryAttributePrefix])            {                filteredDict[[key substringFromIndex:[XMLDictionaryAttributePrefix length]]] = self[key];            }        }        return [filteredDict count]? filteredDict: nil;    }    return nil;}- (NSDictionary *)childNodes{       NSMutableDictionary *filteredDict = [self mutableCopy];    [filteredDict removeObjectsForKeys:@[XMLDictionaryAttributesKey, XMLDictionaryCommentsKey, XMLDictionaryTextKey, XMLDictionaryNodeNameKey]];    for (NSString *key in [filteredDict allKeys])    {        if ([key hasPrefix:XMLDictionaryAttributePrefix])        {            [filteredDict removeObjectForKey:key];        }    }    return [filteredDict count]? filteredDict: nil;}- (NSArray *)comments{    return self[XMLDictionaryCommentsKey];}- (NSString *)nodeName{    return self[XMLDictionaryNodeNameKey];}- (id)innerText{       id text = self[XMLDictionaryTextKey];    if ([text isKindOfClass:[NSArray class]])    {        return [text componentsJoinedByString:@"\n"];    }    else    {        return text;    }}- (NSString *)innerXML{       NSMutableArray *nodes = [NSMutableArray array];    for (NSString *comment in [self comments])    {        [nodes addObject:[NSString stringWithFormat:@"<!--%@-->", [comment XMLEncodedString]]];    }    NSDictionary *childNodes = [self childNodes];    for (NSString *key in childNodes)    {        [nodes addObject:[XMLURLParser XMLStringForNode:childNodes[key] withNodeName:key]];    }    NSString *text = [self innerText];    if (text)    {        [nodes addObject:[text XMLEncodedString]];    }    return [nodes componentsJoinedByString:@"\n"];}- (NSString *)XMLString{    if ([self count] == 1 && ![self nodeName])    {        //ignore outermost dictionary        return [self innerXML];    }    else    {        return [XMLURLParser XMLStringForNode:self withNodeName:[self nodeName] ?: @"root"];    }}- (NSArray *)arrayValueForKeyPath:(NSString *)keyPath{    id value = [self valueForKeyPath:keyPath];    if (value && ![value isKindOfClass:[NSArray class]])    {        return @[value];    }    return value;}- (NSString *)stringValueForKeyPath:(NSString *)keyPath{    id value = [self valueForKeyPath:keyPath];    if ([value isKindOfClass:[NSArray class]])    {        value = [value count]? value[0]: nil;    }    if ([value isKindOfClass:[NSDictionary class]])    {        return [(NSDictionary *)value innerText];    }    return value;}- (NSDictionary *)dictionaryValueForKeyPath:(NSString *)keyPath{    id value = [self valueForKeyPath:keyPath];    if ([value isKindOfClass:[NSArray class]])    {        value = [value count]? value[0]: nil;    }    if ([value isKindOfClass:[NSString class]])    {        return @{XMLDictionaryTextKey: value};    }    return value;}@end@implementation NSString (XMLDictionary)- (NSString *)XMLEncodedString{       return [[[[[self stringByReplacingOccurrencesOfString:@"&" withString:@"&"]               stringByReplacingOccurrencesOfString:@"<" withString:@"<"]              stringByReplacingOccurrencesOfString:@">" withString:@">"]             stringByReplacingOccurrencesOfString:@"\"" withString:@"""]            stringByReplacingOccurrencesOfString:@"\'" withString:@"&apos;"];}@end

i hope this answer is useful for you.

Use TBXml parser..That is the easiest way and also less time taken to parse a value..U can download TBXMLDemo project on github and to print that instead of label u can use table view cell and make it selection as null.So that it looks simillarly like label.If u need more details comment me,..i'll be helping it..