Two ways to parse HTML for iOS

1. Recently did not have to parse the HTML text, in the parsing will encounter some problems, but now also solved, I used two ways to parse the HTML page, now say what is the way to parse

The first method: use regular Expressions (Http://rss.sina.com.cn/sports/basketball/nba.xml the data that needs to be parsed)

Use multithreading to parse HTML data:

-(void) getnews{

Using multithreaded development

Dispatch_async (Dispatch_get_global_queue (dispatch_queue_priority_default, 0), ^{

The requested URL

NSString *requeststr = @ "Http://rss.sina.com.cn/sports/global/focus.xml";

NSString *htmlstr = [NSString stringwithcontentsofurl:[nsurl urlwithstring:requeststr] encoding:NSUTF8StringEncoding Error:nil];

Dispatch_async (Dispatch_get_main_queue (), ^{//method to return to the main thread

NSLog (@ "Call back the data is:%@", HTMLSTR);

[Self updatview:htmlstr];

});

});

}

<item> the data that needs to be parsed

<title>

<! [cdata[warm-up-world wave equaliser after the lore of AC Milan 1-2 negative Lyon]]>

</title>

<link>http://go.rss.sina.com.cn/redirect.php?url=http://sports.sina.com.cn/g/seriea/2015-07-19/ 04407658051.shtml</link>

<author>WWW.SINA.COM.CN</author>

<guid>http://go.rss.sina.com.cn/redirect.php?url=http://sports.sina.com.cn/g/seriea/2015-07-19/ 04407658051.shtml</guid>

<category>

<! [Cdata[international football-Focus News]]>

</category>

<pubdate>sat, 20:40:57 gmt</pubdate>

<comments>http://comment.news.sina.com.cn/cgi-bin/comment/comment.cgi?channel=gn&amp;newsid= 6-12-4810592</comments>

<description>

<! [cdata[]]>

</description>

</item>

-(void) Updatview: (NSString *) htmlstr{

Data source for Title

NSString *copy = htmlstr;

int start = 0;

while (YES) {

Start from that position.

HTMLSTR = [Htmlstr Substringfromindex:start];

Set a flag

NSString *tag = @ "cdata\\[.*\\]";

Set a range (regular expression method)

Nsrange rang = [htmlstr rangeofstring:tag options:nsregularexpressionsearch];

if (Rang.length >0) {

NSString *find = [Htmlstr Substringwithrange:rang];

find = [[Find stringbyreplacingoccurrencesofstring:@ "cdata[" withstring:@ ""]stringbyreplacingoccurrencesofstring:@ "]" withstring:@ "";

NSLog (@ "Find:%@", find);

start = (int) (rang.location +rang.length);

if ([Find isequaltostring:@ ""]| | [Find isequaltostring:@ "international football-Focus News]") {

Continue

}

else{

[Self.titlearrray Addobject:find];

}

}else{

Break

}

}

Urlarray

htmlstr = copy;

int start2 = 0;

while (YES) {

1 start from that position

HTMLSTR = [Htmlstr substringfromindex:start2];

2. Set a tag

NSString *tag2 = @ "<link>.*</link>";

3. Set a range

Nsrange rang2 = [Htmlstr rangeofstring:tag2 options:nsregularexpressionsearch];

if (Rang2.length > 0) {

NSString *find2 = [Htmlstr substringwithrange:rang2];

Find2 = [[Find2 stringbyreplacingoccurrencesofstring:@ "<link>" withstring:@ "] stringbyreplacingoccurrencesofstring:@ "</link>" withstring:@ ""];

[Self.urlarray Addobject:find2];

NSLog (@ "find2:%@", Find2);

Start2 = (int) (rang2.location +rang2.length);

}else {

Break

}

}

Timearray

htmlstr = copy;

int start3 = 0;

while (YES) {

1 start from that position

HTMLSTR = [Htmlstr substringfromindex:start3];

2. Set a tag

NSString *tag3 = @ "<pubDate>.*</pubDate>";

3. Set a range

Nsrange rang3 = [Htmlstr rangeofstring:tag3 options:nsregularexpressionsearch];

if (Rang3.length > 0) {

NSString *find3 = [Htmlstr substringwithrange:rang3];

Find3 = [[Find3 stringbyreplacingoccurrencesofstring:@ "<pubDate>" withstring:@ "] stringbyreplacingoccurrencesofstring:@ "</pubDate>" withstring:@ ""];

[Self.dataarray Addobject:find3];

NSLog (@ "find2:%@", Find3);

START3 = (int) (rang3.location +rang3.length);

}else {

Break

}

}

[Self.titlearrray removeobjectatindex:0];

[Self.titlearrray removeobjectatindex:0];

[Self.titlearrray removeobjectatindex:0];

[Self.urlarray removeobjectatindex:0];

[Self.urlarray removeobjectatindex:0];

[Self.urlarray removeobjectatindex:0];

[Self.dataarray removeobjectatindex:0];

NSLog (@ "%@,%@,%@", Self.titlearrray, Self.urlarray, Self.dataarray);

[Self. Newtableview Reloaddata];

}

The second way: (using third-party library Tfhpple)

-(void) Jiexi {

Nsurlrequest *request=[nsurlrequest requestwithurl:[nsurl urlwithstring:@ "http://rss.sina.com.cn/sports/ Basketball/nba.xml "];

NSData *data=[nsurlconnection sendsynchronousrequest:request Returningresponse:nil Error:nil];

Tfhpple *doc=[[tfhpple alloc] initwithxmldata:data];

Nsarray *items=[doc searchwithxpathquery:@ "//item"];

Self.articles=[nsmutablearray array];

Article *aricle=nil;

For (tfhppleelement *item in items) {

Aricle=[[article alloc] init];

For (Tfhppleelement *element in Item.children) {

if ([@ "title" IsEqualToString:element.tagName]) {

Aricle.title=element.content;

}else if ([@ "link" isEqualToString:element.tagName]) {

Aricle.link=element.content;

}

}

[Self.articles AddObject:aricle.title];

}

}

There is a problem here, I took the data last night is always out, the teacher depressed Ah, the original is a lot of analytical data inside the space and line, to remove the line can be implemented data loading:

-(Nsinteger) TableView: (UITableView *) TableView numberofrowsinsection: (Nsinteger) section{

return self.articles.count;

}

-(UITableViewCell *) TableView: (UITableView *) TableView Cellforrowatindexpath: (Nsindexpath *) Indexpath

{

UITableViewCell *cell = [TableView dequeuereusablecellwithidentifier:@ "Cell"];

if (!cell) {

cell = [[UITableViewCell alloc]initwithstyle:uitableviewcellstyledefault reuseidentifier:@ "Cell"];

}

NSString * string = [Self.articles ObjectAtIndex:indexPath.row];

nsstring* headerdata=string;

Headerdata = [Headerdata stringbytrimmingcharactersinset:[nscharacterset Whitespaceandnewlinecharacterset]]; Remove end-of-line whitespace characters and newline characters

Headerdata = [Headerdata stringbyreplacingoccurrencesofstring:@ "\ r" withstring:@ ""];

Headerdata = [Headerdata stringbyreplacingoccurrencesofstring:@ "\ n" withstring:@ ""];

Cell.textLabel.text = Headerdata;

Cell.textLabel.numberOfLines = 0;

return cell;

}

Two ways to parse HTML for iOS