HTML表解析xcode

Question

我想解析：[www.neiu.edu/~neiutemp/PhoneBook/alpha.htm]使用TFHPPLE分析器，我正在尋找從每個TR（行第一列） ）在一張桌子裏。這裏所有的TD屬性都是一樣的。我無法區分TD。
我能夠獲得所有的HTML代碼，但未能從每個TR獲得第一個TD。在// 3之後（在代碼中）tutorialsNodes爲空。的

NSLog(@"Nodes are : %@",[tutorialsNodes description]); 

輸出是

 
Practice1[62351:c07] Nodes are :(). 

我看不出有什麼不對。任何幫助，將不勝感激。 我的代碼來解析這個URL：

NSURL *tutorialsUrl = [NSURL URLWithString:@"http://www.neiu.edu/~neiutemp/PhoneBook/alpha.htm"]; 
NSData *tutorialsHtmlData = [NSData dataWithContentsOfURL:tutorialsUrl]; 

// 2 
TFHpple *tutorialsParser = [TFHpple hppleWithHTMLData:tutorialsHtmlData]; 

// 3 
NSString *tutorialsXpathQueryString = @"//TR/TD"; 
NSArray *tutorialsNodes = [tutorialsParser searchWithXPathQuery:tutorialsXpathQueryString]; 
NSLog(@"Nodes are : %@",[tutorialsNodes description]); 
// 4 
NSMutableArray *newTutorials = [[NSMutableArray alloc] initWithCapacity:0]; 
for (TFHppleElement *element in tutorialsNodes) { 
    // 5 
    Tutorial *tutorial = [[Tutorial alloc] init]; 
    [newTutorials addObject:tutorial]; 

    // 6 
    tutorial.title = [[element firstChild] content]; 

    // 7 
    tutorial.url = [element objectForKey:@"href"]; 

    NSLog(@"title is: %@",[tutorial.title description]); 
} 

// 8 
_objects = newTutorials; 
[self.tableView reloadData]; 

Answer 1

如果使用@"//tr/td"代替@"//TR/TD"這應該工作。

看着你的HTML，雖然它的作者顯然不知道如何拼寫CSS，但你在源代碼中埋藏了字體標籤。所以，你的下一個行代碼，這顯然是從優秀Hpple tutorial by Matt Galloway on Ray Wenderlich's site拍攝，他說：

tutorial.title = [[element firstChild] content]; 

但是，這不會在這裏工作，因爲對於大多數條目中，firstChild不是text，而是這是一個font標籤。所以，你可以檢查，看它是否是一個font標籤，像這樣：

TFHppleElement *subelement = [element firstChild]; 
if ([[subelement tagName] isEqualToString:@"font"]) 
    subelement = [subelement firstChild]; 
tutorial.title = [subelement content]; 

或者，你可以而不是隻搜索@"//tr/td/font"而不是@"//tr/td"。很多方法在這裏。這個技巧（就像所有的HTML解析一樣）將會使它具有相當的穩健性，所以你不會輕易對頁面進行微小的修飾。

很明顯，您的HTML沒有URL，因此代碼在這裏不適用。

無論如何，我希望這足以讓你走。

---

您報告有問題，所以我想我只是提供一個更完整的代碼示例：

NSURL *tutorialsUrl = [NSURL URLWithString:@"http://www.neiu.edu/~neiutemp/PhoneBook/alpha.htm"]; 
NSData *tutorialsHtmlData = [NSData dataWithContentsOfURL:tutorialsUrl]; 

TFHpple *tutorialsParser = [TFHpple hppleWithHTMLData:tutorialsHtmlData]; 

NSString *tutorialsXpathQueryString = @"//tr/td"; 
NSArray *tutorialsNodes = [tutorialsParser searchWithXPathQuery:tutorialsXpathQueryString]; 

if ([tutorialsNodes count] == 0) 
    NSLog(@"nothing there"); 
else 
    NSLog(@"There are %d nodes", [tutorialsNodes count]); 

NSMutableArray *newTutorials = [[NSMutableArray alloc] initWithCapacity:0]; 
for (TFHppleElement *element in tutorialsNodes) { 

    Tutorial *tutorial = [[Tutorial alloc] init]; 
    [newTutorials addObject:tutorial]; 

    TFHppleElement *subelement = [element firstChild]; 
    if ([[subelement tagName] isEqualToString:@"font"]) 
     subelement = [subelement firstChild]; 
    tutorial.title = [subelement content]; 

    NSLog(@"title is: %@", [tutorial.title description]); 
} 

這將產生以下的輸出：

 
2013-05-10 19:39:42.027 hpple-test[33881:c07] There are 10773 nodes 
2013-05-10 19:39:42.028 hpple-test[33881:c07] title is: A 
2013-05-10 19:39:46.027 hpple-test[33881:c07] title is: (null) 
2013-05-10 19:39:46.698 hpple-test[33881:c07] title is: (null) 
2013-05-10 19:39:47.333 hpple-test[33881:c07] title is: (null) 
2013-05-10 19:39:47.827 hpple-test[33881:c07] title is: (null) 
2013-05-10 19:39:48.358 hpple-test[33881:c07] title is: (null) 
2013-05-10 19:39:49.133 hpple-test[33881:c07] title is: (null) 
2013-05-10 19:39:49.775 hpple-test[33881:c07] title is: Abay, Hiwet B 
2013-05-10 19:39:50.326 hpple-test[33881:c07] title is: H-Abay 
2013-05-10 19:39:50.992 hpple-test[33881:c07] title is: 773-442-5140 
2013-05-10 19:39:51.597 hpple-test[33881:c07] title is: (null) 
2013-05-10 19:39:52.092 hpple-test[33881:c07] title is: Controller 
2013-05-10 19:39:52.598 hpple-test[33881:c07] title is: E 
2013-05-10 19:39:53.149 hpple-test[33881:c07] title is: 223 
2013-05-10 19:39:55.040 hpple-test[33881:c07] title is: Abbruscato, Terence 
2013-05-10 19:39:55.806 hpple-test[33881:c07] title is: T-Abbruscato 
2013-05-10 19:39:56.525 hpple-test[33881:c07] title is: 773-442-5339 
...