Question

我有以下代码 - 读取xml文件的方法。但它对我来说效果很慢。没有足够的方法来获取＆amp;更快地读取数据。

if(connectionRemaining)
{
    [self LoadingPopUp];
    NSURL *tmpURl=[NSURL URLWithString:[NSString stringWithFormat:@"%@getcategory.php",[iGolfAppDelegate getServerPath]]];
    NSMutableURLRequest *theRequest=[NSMutableURLRequest requestWithURL:tmpURl];
    NSURLConnection *conn=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self];
    if(conn)
        myWebData=[[NSMutableData data] retain];
    connectionRemaining=NO;
}

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[myWebData setLength: 0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
[myWebData appendData:data];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
[connection release];
}
-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
//  NSString *theXML = [[NSString alloc] initWithBytes: [myWebData mutableBytes] length:[myWebData length] encoding:NSUTF8StringEncoding];
//  NSLog(@"%@",theXML);[theXML release];   
if( myXMLParser )
    [myXMLParser release];
myXMLParser = [[NSXMLParser alloc] initWithData: myWebData];
[myXMLParser setDelegate: self]; [myXMLParser setShouldResolveExternalEntities: YES];
[myXMLParser parse];[connection release];[myWebData release];
}

#pragma mark
#pragma mark XMLParsing Methods
-(void)parser:(NSXMLParser*)parser didStartElement:(NSString*)elementName namespaceURI:(NSString*)namespaceURI qualifiedName:(NSString*)qualifiedName attributes:(NSDictionary*)attributeDict {
if([elementName isEqualToString:@"category"])
    categoryArray=[[NSMutableArray alloc]init];
else if([elementName isEqualToString:@"Prop_Category"])
    aCategory=[[Category alloc] init];
}

-(void)parser:(NSXMLParser*)parser foundCharacters:(NSString*)string {
if(!currentElementValue)
    currentElementValue=[[NSMutableString alloc] initWithString:string];
else
    [currentElementValue appendString:string];
}
-(void)parser:(NSXMLParser*)parser didEndElement:(NSString*)elementName namespaceURI:(NSString*)namespaceURI qualifiedName:(NSString*)qualifiedName {
if([elementName isEqualToString:@"category"])
{ [LoadingAlert dismissWithClickedButtonIndex:0 animated:YES]; [LoadingAlert release];[self categoryPickerDiplay]; return;  }
else if([elementName isEqualToString:@"Prop_Category"])
{ [categoryArray addObject:aCategory];[aCategory release];aCategory=nil; }
else{   
    [aCategory setValue:currentElementValue forKey:elementName];
    [currentElementValue release];currentElementValue=nil;
}

}

让我再次澄清我的问题。

我观察到这种读取xml的方法还不够。通过这种方式，iPhone可以非常缓慢地加载数据。因为，iphone会阅读＆amp;每次比较每个标签。

我想要一些更快的XML Loading＆amp;解析。

提前感谢您与我分享您的知识

Answer 1

Apple有一个名为XMLPerformance的例子，它说明了libxml与NSXMLParser的性能。查看它的libxml实现。

Answer 2

来自adc的SiesmicXML和TopSongs代码示例显示了解析XML的一些方法，这些方法导致用户等待时间最短。

Answer 3

您是否查看了libxml C库或TouchXML包装器？另外，你确定NSXMLParser导致你的减速吗？您可能希望使用Instruments或Shark进行快速修改以分析应用程序并找到热点。

iPhone中需要更快的xml读取

3 个答案: