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html - 从 HTML 中提取 URL 并保留文本(如果有)

转载 作者:行者123 更新时间:2023-11-29 02:12:46 25 4
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我有一个字符串,每次字符串都会改变。我想要一个代码,以便从 HTML 中提取 url。如果有一些文本,我想将文本保留在一个字符串中,将 URL 保留在另一个字符串中

一个例子

string = <div class=\"separator\" style=\"clear: both; text-align: center;\">\n<a href=\"http://4.bp.blogspot.com/-K7vl-ShXrNc/VQU-D0NTFgI/AAAAAAAAAOg/aBIUOwF2nEQ/s1600/contact.png\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img border=\"0\" src=\"http://4.bp.blogspot.com/-K7vl-ShXrNc/VQU-D0NTFgI/AAAAAAAAAOg/aBIUOwF2nEQ/s1600/contact.png\" /></a></div>\n<br />

提取的 URL = http://4.bp.blogspot.com/-K7vl-ShXrNc/VQU-D0NTFgI/AAAAAAAAAOg/aBIUOwF2nEQ/s1600/contact.png

我如何在 Xcode 中执行此操作

编辑:我的代码

- (void)viewDidLoad
{
[super viewDidLoad];

self.eventNamesArray = [NSMutableArray array];
self.eventsDictionary = [NSMutableDictionary dictionary];
}

- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];

[self searchForEvents];
}

//Json Parsing
- (void)searchForEvents
{

NSString *eventsSearchUrlString = [NSString stringWithFormat:@"https://www.googleapis.com/blogger/v3/blogs/1562818803553764290/posts?key=AIzaSyBTOxz-vPHgzIkw9k88hDKd99ILTaXTt0Y"];
NSURL *eventsSearchUrl = [NSURL URLWithString:eventsSearchUrlString];
NSURLRequest *eventsSearchUrlRequest = [NSURLRequest requestWithURL:eventsSearchUrl];

NSURLSession *sharedUrlSession = [NSURLSession sharedSession];
NSURLSessionDataTask *searchEventsTask =
[sharedUrlSession dataTaskWithRequest:eventsSearchUrlRequest completionHandler:
^(NSData *data, NSURLResponse *response, NSError *error)
{
dispatch_async(dispatch_get_main_queue(),
^{
[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;

if(error)
{
UIAlertView *searchAlertView = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Please check your internet connection" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[searchAlertView show];
}
else
{
NSError *jsonParseError = nil;
NSDictionary *jsonDictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:&jsonParseError];

if(jsonParseError)
{
UIAlertView *jsonParseErrorAlert = [[UIAlertView alloc] initWithTitle:@"Error" message:jsonParseError.localizedDescription delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[jsonParseErrorAlert show];
}
else
{
[self.eventNamesArray removeAllObjects];
[self.eventsDictionary removeAllObjects];

NSArray *searchResultsArray = [jsonDictionary objectForKey:@"items"];
NSLog(@"test%@",searchResultsArray);


for(NSDictionary *eventsInfoDictionary in searchResultsArray)
{
Events *event = [[Events alloc] init];
event.eventName = [eventsInfoDictionary objectForKey:@"title"];
event.eventDescription =[eventsInfoDictionary objectForKey:@"content"];
stringWithURL = [eventsInfoDictionary objectForKey:@"content"];

NSString *eventsAsStrings = [event.eventName substringToIndex:event.eventName.length];
NSMutableArray *eventsInArray = [self.eventsDictionary objectForKey:eventsAsStrings];

if(!eventsInArray)
{
eventsInArray = [NSMutableArray array];
[self.eventNamesArray addObject:eventsAsStrings];
}

[eventsInArray addObject:event];

[self.eventsDictionary setObject:eventsInArray forKey:eventsAsStrings];

if ([event.eventDescription containsString:@"<br />"]) {
NSString* eventDescrip = event.eventDescription;
NSString* stringWithoutHTMLtags = [eventDescrip stringByReplacingOccurrencesOfString:@"<br />" withString:@""];
event.eventDescription = stringWithoutHTMLtags;
}

}
NSLog(@"Event Name : %@", event.eventName);
NSLog(@"Event Description : %@", event.eventDescription);

}

[self.eventNamesArray sortedArrayUsingComparator:^NSComparisonResult(Events *obj1, Events *obj2) {
Events *time1 = obj1;
Events *time2 = obj2;
if (time1 > time2) {
return (NSComparisonResult)NSOrderedDescending;
}
else if (time1 < time2) {
return (NSComparisonResult)NSOrderedAscending;
}
return (NSComparisonResult)NSOrderedSame;
}];
[self.tableView reloadData];

}
}
});
}];

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
[searchEventsTask resume];
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
if (searchText.length == 0) {
isFiltered = NO;
}
else {
isFiltered = YES;
}
NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF BEGINSWITH[c] %@",searchText];
self.filteredEventsArray = [eventNamesArray filteredArrayUsingPredicate:pred];
[self.tableView reloadData];
}

- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {
[searchBar resignFirstResponder];
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
if (isFiltered == YES) {
return filteredEventsArray.count;
}
else {
return self.eventNamesArray.count;
}
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSArray *eventsWithFirstLetter;
if (isFiltered == YES) {
NSString *firstLetter = [self.filteredEventsArray objectAtIndex:section];
eventsWithFirstLetter = [self.eventsDictionary objectForKey:firstLetter];
return eventsWithFirstLetter.count;
}
else {
NSString *firstLetter = [self.eventNamesArray objectAtIndex:section];
eventsWithFirstLetter = [self.eventsDictionary objectForKey:firstLetter];
return eventsWithFirstLetter.count;
}
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"eventTitleCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
Events *event;
if (isFiltered == YES) {
NSString *firstLetter = [self.filteredEventsArray objectAtIndex:indexPath.section];
NSArray *eventsWithFirstLetter = [self.eventsDictionary objectForKey:firstLetter];
event = [eventsWithFirstLetter objectAtIndex:indexPath.row];
cell.textLabel.text = event.eventName;
}
else {
NSString *firstLetter = [self.eventNamesArray objectAtIndex:indexPath.section];
NSArray *eventsWithFirstLetter = [self.eventsDictionary objectForKey:firstLetter];
event = [eventsWithFirstLetter objectAtIndex:indexPath.row];
cell.textLabel.text = event.eventName;
}
return cell;
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

NSString *firstLetter = [self.eventNamesArray objectAtIndex:indexPath.section];
NSArray *eventsWithFirstLetter = [self.eventsDictionary objectForKey:firstLetter];
Events *event = [eventsWithFirstLetter objectAtIndex:indexPath.row];

UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];
DescriptionViewController *descriptionViewController = (DescriptionViewController*)[mainStoryboard instantiateViewControllerWithIdentifier: @"descriptionController"];
descriptionViewController.eventNameDesc = event.eventDescription;
descriptionViewController.navigationItem.title = event.eventName;

[self.navigationController pushViewController:descriptionViewController animated:YES];

}



@end

最佳答案

你可以这样做:

NSError *error = nil;
NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink
error:&error];

[detector enumerateMatchesInString:someString
options:0
range:NSMakeRange(0, someString.length)
usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop)
{
if (result.resultType == NSTextCheckingTypeLink)
{
NSString *str = [NSString stringWithFormat:@"%@",result.URL];
NSLOG(%@,str);

}
}];

希望对你有帮助......:)

关于html - 从 HTML 中提取 URL 并保留文本(如果有),我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/29097750/

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