问题
I'm looking for the most "easy-to-implement" method to parse XMLs in Objective-C mobile applications. I tried to use TBXML but I'm a newbie and I got several errors with that...do you think there's something easier out there? Thanks
回答1:
this is very simple xml parsing..
- (void)viewDidLoad
{
[super viewDidLoad];
self.title=@"Feeds";
titarry=[[NSMutableArray alloc] init];
linkarray=[[NSMutableArray alloc] init];
NSString *rssaddr=@"http://news.prlog.org/rss.xml";
NSURL *url=[NSURL URLWithString:rssaddr];
xmlparser =[[NSXMLParser alloc] initWithContentsOfURL:url];
[xmlparser setDelegate:self];
[xmlparser parse];
// Do any additional setup after loading the view from its nib.
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict;
{
classelement=elementName;
if([elementName isEqualToString:@"item"])
{
itemselected=YES;
mutttitle=[[NSMutableString alloc] init];
mutstrlink=[[NSMutableString alloc] init];
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName;
{
if([elementName isEqualToString:@"item"])
{
itemselected=NO;
[titarry addObject:mutttitle];
[linkarray addObject:mutstrlink];
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string;
{
if (itemselected)
{
if ([classelement isEqualToString:@"title"])
{
[mutttitle appendString:string];
}
else if ([classelement isEqualToString:@"link"])
{
[mutstrlink appendString:string];
}
}
}
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError;
{
UIAlertView *alt=[[UIAlertView alloc] initWithTitle:@"RSS Reader"
message:[NSString stringWithFormat:@"%@",parseError]
delegate:nil
cancelButtonTitle:@"Close"
otherButtonTitles:nil];
[alt show];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [titarry count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] ;
}
cell.textLabel.text=[titarry objectAtIndex:indexPath.row];
cell.accessoryType=UITableViewCellSelectionStyleBlue;
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
secondViewController *second = [[secondViewController alloc] initWithNibName:@"secondViewController" bundle:nil];
[self.navigationController pushViewController:second animated:YES];
NSURL *url=[NSURL URLWithString:[titarry objectAtIndex:indexPath.row]];
NSURLRequest *req=[NSURLRequest requestWithURL:url];
second.webView.scalesPageToFit=YES;
[second.webView loadRequest:req];//here we have to perform changes try to do some things here
}
add following this in your .h file
@interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate,NSXMLParserDelegate>
{
NSXMLParser *xmlparser;
NSString *classelement;
NSMutableArray *titarry;
NSMutableArray *linkarray;
bool itemselected;
NSMutableString *mutttitle;
NSMutableString *mutstrlink;
}
@property (weak, nonatomic) IBOutlet UITableView *tableView;
回答2:
- (void)applicationDidFinishLaunching:(UIApplication *)application {
NSURL *url = [[NSURL alloc] initWithString:@"Your link of the XML"];
NSXMLParser *xmlParser = [[NSXMLParser alloc] initWithContentsOfURL:url];
//Initialize the delegate.
XMLParser *parser = [[XMLParser alloc] initXMLParser];
//Set delegate
[xmlParser setDelegate:parser];
//Start parsing the XML file.
BOOL success = [xmlParser parse];
if(success)
NSLog(@"No Errors");
else
NSLog(@"Error Error Error!!!");
// Configure and show the window
[window addSubview:[navigationController view]];
[window makeKeyAndVisible];
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict;
{
classelement=elementName;
if([elementName isEqualToString:@"item"])
{
itemselected=YES;
mutttitle=[[NSMutableString alloc] init];
mutstrlink=[[NSMutableString alloc] init];
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName;
{
if([elementName isEqualToString:@"item"])
{
itemselected=NO;
[titarry addObject:mutttitle];
[linkarray addObject:mutstrlink];
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string;
{
if (itemselected)
{
if ([classelement isEqualToString:@"title"])
{
[mutttitle appendString:string];
}
else if ([classelement isEqualToString:@"link"])
{
[mutstrlink appendString:string];
}
}
}
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError;
{
UIAlertView *alt=[[UIAlertView alloc] initWithTitle:@"RSS Reader"
message:[NSString stringWithFormat:@"%@",parseError]
delegate:nil
cancelButtonTitle:@"Close"
otherButtonTitles:nil];
[alt show];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [titarry count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] ;
}
cell.textLabel.text=[titarry objectAtIndex:indexPath.row];
cell.accessoryType=UITableViewCellSelectionStyleBlue;
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
secondViewController *second = [[secondViewController alloc] initWithNibName:@"secondViewController" bundle:nil];
[self.navigationController pushViewController:second animated:YES];
NSURL *url=[NSURL URLWithString:[titarry objectAtIndex:indexPath.row]];
NSURLRequest *req=[NSURLRequest requestWithURL:url];
second.webView.scalesPageToFit=YES;
[second.webView loadRequest:req];//here we have to perform changes try to do some things here
}
来源：https://stackoverflow.com/questions/23579687/easy-xml-parser-for-ios-objective-c