Iphone NSXMLParser NSCFString内存泄漏

我正在构建一个解析rss提要的应用程序。在应用程序中，有两种不同类型的提要，提要中的元素具有不同的名称，因此我创建了一个NSXMLParser NSObject，在解析之前获取每个提要元素的名称。这是我的密码：

NewsFeedParser.h

#import @interface NewsFeedParser : NSObject { NSInteger NewsSelectedCategory; NSXMLParser *NSXMLNewsParser; NSMutableArray *newsCategories; NSMutableDictionary *NewsItem; NSMutableString *NewsCurrentElement, *NewsCurrentElement1, *NewsCurrentElement2, *NewsCurrentElement3; NSString *NewsItemType, *NewsElement1, *NewsElement2, *NewsElement3; NSInteger NewsNumElements; } - (void) parseXMLFileAtURL:(NSString *)URL; @property(nonatomic, retain) NSString *NewsItemType; @property(nonatomic, retain) NSString *NewsElement1; @property(nonatomic, retain) NSString *NewsElement2; @property(nonatomic, retain) NSString *NewsElement3; @property(nonatomic, retain) NSMutableArray *newsCategories; @property(assign, nonatomic) NSInteger NewsNumElements; @end #进口 @接口NewsFeedParser:NSObject{ NSInteger新闻选择类别； NSXMLParser*NSXMLNewsParser； NSMutableArray*新闻类别； NSMutableDictionary*新闻项； NSMutableString*NewsCurrentElement、*NewsCurrentElement1、*NewsCurrentElement2、*NewsCurrentElement3； NSString*NewsItemType、*NewsElement1、*NewsElement2、*NewsElement3； NSInteger新闻； } -（void）parseXMLFileAtURL:（NSString*）URL； @属性（非原子，保留）NSString*NewsItemType； @属性（非原子，保留）NSString*NewElement1； @属性（非原子，保留）NSString*NewElement2； @属性（非原子，保留）NSString*NewElement3； @属性（非原子，保留）NSMutableArray*新闻类别； @属性（赋值，非原子）集成器新闻元素； @结束 NewsFeedParser.m

#import "NewsFeedParser.h" @implementation NewsFeedParser @synthesize NewsItemType; @synthesize NewsElement1; @synthesize NewsElement2; @synthesize NewsElement3; @synthesize newsCategories; @synthesize NewsNumElements; - (void)parserDidStartDocument:(NSXMLParser *)parser{ } - (void)parseXMLFileAtURL:(NSString *)URL { newsCategories = [[NSMutableArray alloc] init]; URL = [URL stringByReplacingOccurrencesOfString:@" " withString:@""]; URL = [URL stringByReplacingOccurrencesOfString:@"\n" withString:@""]; URL = [URL stringByReplacingOccurrencesOfString:@" " withString:@""]; //you must then convert the path to a proper NSURL or it won't work NSURL *xmlURL = [NSURL URLWithString:URL]; // here, for some reason you have to use NSClassFromString when trying to alloc NSXMLParser, otherwise you will get an object not found error // this may be necessary only for the toolchain [[NSURLCache sharedURLCache] setMemoryCapacity:0]; [[NSURLCache sharedURLCache] setDiskCapacity:0]; NSXMLNewsParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL]; // Set self as the delegate of the parser so that it will receive the parser delegate methods callbacks. [NSXMLNewsParser setDelegate:self]; // Depending on the XML document you're parsing, you may want to enable these features of NSXMLParser. [NSXMLNewsParser setShouldProcessNamespaces:NO]; [NSXMLNewsParser setShouldReportNamespacePrefixes:NO]; [NSXMLNewsParser setShouldResolveExternalEntities:NO]; [NSXMLNewsParser parse]; [NSXMLNewsParser release]; } - (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError { NSString * errorString = [NSString stringWithFormat:@"Unable to download story feed from web site (Error code %i )", [parseError code]]; NSLog(@"error parsing XML: %@", errorString); UIAlertView * errorAlert = [[UIAlertView alloc] initWithTitle:@"Error loading content" message:errorString delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [errorAlert show]; [errorAlert release]; [errorString release]; } - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{ NewsCurrentElement = [elementName copy]; if ([elementName isEqualToString:NewsItemType]) { // clear out our story item caches... NewsItem = [[NSMutableDictionary alloc] init]; NewsCurrentElement1 = [[NSMutableString alloc] init]; NewsCurrentElement2 = [[NSMutableString alloc] init]; if(NewsNumElements == 3) { NewsCurrentElement3 = [[NSMutableString alloc] init]; } } } - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{ if ([elementName isEqualToString:NewsItemType]) { // save values to an item, then store that item into the array... [NewsItem setObject:NewsCurrentElement1 forKey:NewsElement1]; [NewsItem setObject:NewsCurrentElement2 forKey:NewsElement2]; if(NewsNumElements == 3) { [NewsItem setObject:NewsCurrentElement3 forKey:NewsElement3]; } [newsCategories addObject:[[NewsItem copy] autorelease]]; [NewsCurrentElement release]; [NewsCurrentElement1 release]; [NewsCurrentElement2 release]; if(NewsNumElements == 3) { [NewsCurrentElement3 release]; } [NewsItem release]; } } - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { //NSLog(@"found characters: %@", string); // save the characters for the current item... if ([NewsCurrentElement isEqualToString:NewsElement1]) { [NewsCurrentElement1 appendString:string]; } else if ([NewsCurrentElement isEqualToString:NewsElement2]) { [NewsCurrentElement2 appendString:string]; } else if (NewsNumElements == 3 && [NewsCurrentElement isEqualToString:NewsElement3]) { [NewsCurrentElement3 appendString:string]; } } - (void)dealloc { [super dealloc]; [newsCategories release]; [NewsItemType release]; [NewsElement1 release]; [NewsElement2 release]; [NewsElement3 release]; } #导入“NewsFeedParser.h” @NewsFeedParser的实现 @综合新闻条目类型； @合成新闻元素1； @合成新闻元素2； @合成新闻元素3； @综合新闻类别； @综合新闻材料； -（void）parserdistartdocument:（NSXMLParser*）解析器{ } -（void）parseXMLFileAtURL:（NSString*）URL { newsCategories=[[NSMutableArray alloc]init]； URL=[URL stringByReplacingOccurrencesOfString:@“with String:@]”； URL=[URL stringByReplacingOccurrencesOfString:@“\n”带字符串：@”“； URL=[URL stringByReplacingOccurrencesOfString:@“with String:@]”； //然后必须将路径转换为正确的NSURL，否则它将无法工作 NSURL*xmlURL=[NSURL URLWithString:URL]； //在这里，由于某些原因，在尝试分配NSXMLParser时必须使用NSClassFromString，否则将出现“未找到对象”错误 //这可能仅适用于工具链 [[NSURLCache sharedURLCache]设置内存容量：0]； [[NSURLCache sharedURLCache]设置磁盘容量：0]； NSXMLNewsParser=[[NSXMLParser alloc]initWithContentsOfURL:xmlURL]； //将self设置为解析器的委托，以便它将接收解析器委托方法回调。 [NSXMLNewsParser setDelegate:self]； //根据您正在解析的XML文档，您可能希望启用NSXMLParser的这些功能。 [NSXMLNewsParser setShouldProcessNamespaces:否]； [NSXMLNewsParser SetShouldReportNamespace前缀：否]； [NSXMLNewsParser setShouldResolveExternalEntities:否]； [NSXMLNewsParser parse]； [NSXMLNewsParser发行版]； } -（void）解析器：（NSXMLParser*）解析器解析错误发生：（NSError*）解析错误{ NSString*errorString=[NSString stringWithFormat:@“无法从网站下载故事提要（错误代码%i）”，[parseError code]]； NSLog（@“错误解析XML:%@”，errorString）； UIAlertView*errorAlert=[[UIAlertView alloc]initWithTitle:@“加载内容时出错”消息：errorString委托：自取消按钮：@“确定”其他按钮：nil]； [错误警报显示]； [错误警报发布]； [错误字符串释放]； } -（void）parser:（NSXMLParser*）parser didStartElement:（NSString*）elementName namespaceURI:（NSString*）namespaceURI qualifiedName:（NSString*）qName属性：（NSDictionary*）attributeDict{ NewsCurrentElement=[elementName copy]； if（[elementName IsequalString:NewsItemType]） { //清除我们的故事项目缓存。。。 NewsItem=[[NSMutableDictionary alloc]init]； NewsCurrentElement1=[[NSMutableString alloc]init]； NewsCurrentElement2=[[NSMutableString alloc]init]； if（NewsNumElements==3） { NewsCurrentElement3=[[NSMutableString alloc]init]； } } } -（void）parser:（NSXMLParser*）parser didEndElement:（NSString*）elementName namespaceURI:（NSString*）namespaceURI qualifiedName:（NSString*）qName{ if（[elementName IsequalString:NewsItemType]） { //将值保存到项，然后将该项存储到数组中。。。 [NewsItem setObject:NewsCurrentElement1 forKey:NewsElement1]； [NewsItem setObject:NewsCurrentElement2 forKey:NewsElement2]； if（NewsNumElements==3） { [NewsItem setObject:NewsCurrentElement3 forKey:NewsElement3]； } [newsCategories添加对象：[[NewsItem copy]自动删除]]； [新闻元素发布]； [NewsCurrentElement1发布]； [NewsCurrentElement2发布]； if（NewsNumElements==3） { [NewsCurrentElement3发布]； } [新闻发布]； } } -（void）解析器：（NSXMLParser*）解析器查找字符：（NSString*）字符串 { //NSLog（@“找到的字符：%@”，字符串）； //保存当前项目的字符。。。 if（[NewsCurrentElement IsequalString:NewsElement1]）{ [NewsCurrentElement1 appendString:string]； }else if（[NewsCurrentElement IsequalString:NewsElement2]）{ [NewsCurrentElement2 appendString:string]； }else if（NewsNumElements==3&&[NewsCurrentElement IsequalString:NewsElement3]） { [NewsCurrentElement3 appendString:string]； } } -（无效）解除锁定{ [super dealoc]； [新闻类别发布]； [新闻项目类型发布]； [新闻元素1发布]； [新闻元素2发布]； [新闻元素3发布]； } 当我创建类的实例时，我喜欢这样做：

NewsFeedParser *categoriesParser = [[NewsFeedParser alloc] init]; if(newsCat == 0) { categoriesParser.NewsItemType = @"article"; categoriesParser.NewsElement1 = @"category"; categoriesParser.NewsElement2 = @"catid"; } else { categoriesParser.NewsItemType = @"article"; categoriesParser.NewsElement1 = @"category"; categoriesParser.NewsElement2 = @"feedUrl"; } [categoriesParser parseXMLFileAtURL:feedUrl]; newsCategories = [[NSMutableArray alloc] initWithArray:categoriesParser.newsCategories copyItems:YES]; [self.tableView reloadData]; [categoriesParser release]; NewsFeedParser*categoriesParser=[[NewsFeedParser alloc]init]； if（newsCat==0） { categoriesParser.NewsItemType=@“文章”； categoriesParser.NewElement1=@“类别”； categoriesParser.newelement2=@“catid”； } 其他的 { categoriesParser.NewsItemType=@“文章”； categoriesParser.NewElement1=@“类别”； categoriesParser.newelement - (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{ NewsCurrentElement = [[elementName copy] autorelease]; if ([elementName isEqualToString:NewsItemType]) { // clear out our story item caches... NewsItem = [[NSMutableDictionary alloc] init]; NewsCurrentElement1 = [[NSMutableString alloc] init]; NewsCurrentElement2 = [[NSMutableString alloc] init]; if(NewsNumElements == 3) { NewsCurrentElement3 = [[NSMutableString alloc] init]; } } }

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict {

    if (NewsCurrentElement) {
        [NewsCurrentElement release], NewsCurrentElement = nil;
    }
    NewsCurrentElement = [[elementName copy] autorelease];

    if ([elementName isEqualToString:NewsItemType]) {
        // clear out our story item caches...
        if (NewsItem) {
            [NewsItem release], NewsItem = nil;
        }
        NewsItem = [[NSMutableDictionary alloc] init];

        if (NewsCurrentElement1) {
            [NewsCurrentElement1 release], NewsCurrentElement1 = nil;
        }
        NewsCurrentElement1 = [[NSMutableString alloc] init];

        if (NewsCurrentElement2) {
            [NewsCurrentElement2 release], NewsCurrentElement2 = nil;
        }
        NewsCurrentElement2 = [[NSMutableString alloc] init];

        if(NewsNumElements == 3) {
            if (NewsCurrentElement3) {
                [NewsCurrentElement3 release], NewsCurrentElement3 = nil;
            }
            NewsCurrentElement3 = [[NSMutableString alloc] init];
        }
    }
}