NSData needs to be updated

I am parsing HTML using hpple. so now I want my text to be updated as the user touches the next button. my code looks something like this

NSURL *ur = [NSURL URLWithString:[NSString stringWithFormat:@"%@",url.text]];
NSData *htmlData = [NSData dataWithContentsOfURL: ur];
TFHpple *xpathParser = [[TFHpple alloc] initWithHTMLData:htmlData];     
NSArray *elements  = [xpathParser search:@"//table[1]/tr[2]/td[2]/a/text()"]; // get the page title
TFHppleElement *element = [elements objectAtIndex:0];
NSString *h3Tag = [element content];  
mi.text = h3Tag;
NSLog(@"%@",h3Tag);
[xpathParser release];

so I am kind of a new iPhone application development and fairly new to programming. So over here I think NSData needs to be updated.and yes when the user touches the next button the url also changes. so any help on that wo开发者_运维技巧uld be appreciated

thanks

Tushar

NSMutableString *tempString = [[NSMutableString alloc] initWithFormat:@"%@",url.text];

NSURL *ur =[[NSURL alloc] initWithString:tempString];
[tempString release];

NSData *htmlData = [[NSData alloc]initWithContentsOfURL:ur];
TFHpple *xpathParser = [[TFHpple alloc] initWithHTMLData:htmlData];
[ur release];
[htmlData release];
NSArray *elements  = [xpathParser search:@"//table[1]/tr[2]/td[2]/a/text()"]; // get the page title
TFHppleElement *element = [elements objectAtIndex:0];
NSString *h3Tag = [element content];  
mi.text = h3Tag;
NSLog(@"%@",h3Tag);
[xpathParser release];

try this code.

Thanks.