Question

我正在尝试将从XML文件解析的数据从Web显示到名为profilesLabel的UILabel。

我正在尝试显示标签中的所有lastName，但由于某种原因，该值设置为电子邮件地址。有人可以帮助我理解为什么我是Objective-c

的新手

这是代码：

-(id)loadXMLByURL:(NSString *)urlString
{
    profile = [[NSMutableArray alloc] init];
    NSURL *url = [NSURL URLWithString:urlString];
    NSData *data = [[NSData alloc] initWithContentsOfURL:url];
    parser = [[NSXMLParser alloc] initWithData:data];
    parser.delegate = self;
    [parser parse];
    return self;
}

-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    currentNodeContent = (NSMutableString *) [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}


-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    if([elementName isEqualToString:@"firstname"])
    {
        currentProfile = [ViewController alloc];
        isStatus = YES;
    }

    if([elementName isEqualToString:@"lastname"])
    {
        currentProfile = [ViewController alloc];
        isStatus = YES;
    }

    if([elementName isEqualToString:@"email"])
    {
        currentProfile = [ViewController alloc];
        isStatus = YES;
    }

    if([elementName isEqualToString:@"address"])
    {
        currentProfile = [ViewController alloc];
        isStatus = YES;
    }

}

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if([elementName isEqualToString:@"firstname"])
    {
        currentProfile->firstName = currentNodeContent;
        NSLog(@"%@",currentProfile->firstName);
    }

    if([elementName isEqualToString:@"lastname"])
    {
        currentProfile->lastName = currentNodeContent;
        NSLog(@"%@",currentProfile->lastName);
        last_Name.text = currentProfile->lastName;
    }

    if([elementName isEqualToString:@"email"])
    {
        currentProfile->lastName = currentNodeContent;
        NSLog(@"%@",currentProfile->lastName);
        last_Name.text = currentProfile->lastName;
    }

    if([elementName isEqualToString:@"address"])
    {
        currentProfile->lastName = currentNodeContent;
        NSLog(@"%@",currentProfile->lastName);
        last_Name.text = currentProfile->lastName;
    }


    if([elementName isEqualToString:@"profiles"])
    {
        [self->profile addObject:currentProfile];
        currentProfile = nil;
        currentNodeContent = nil;
    }
}


- (IBAction)bringFont:(id)sender
{
    //Here is a button that should show the parsed data in profilesLabel when pressed
    profilesLabel.text = currentProfile->lastName; //Shows email address for some reason
    //What I want is to show every single profile in profilesLabel underneath each other       
}

- (void)viewDidLoad
{

    [profilesScrolView setScrollEnabled:YES];
    [profilesScrolView setContentSize:CGSizeMake(680, 1200)];


    [super viewDidLoad];
    xmlParser = [[ViewController alloc] loadXMLByURL:@"http://dierenpensionlindehof.nl/XML_File.xml"];

}

任何帮助都会受到赞赏，Tahnks！

Answer 1

是这里的问题：

    if([elementName isEqualToString:@"profiles"])
    {
        [self->profile addObject:currentProfile];
        currentProfile = nil;
        currentNodeContent = nil;
    }

您将currentProfile设为nil

然后在这里使用currentProfile：

- (IBAction)bringFont:(id)sender
{
    //Here is a button that should show the parsed data in profilesLabel when pressed
    profilesLabel.text = currentProfile->lastName;

修改在澄清问题之后，想知道如何显示不同的数据。

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName { ... // At the end of each loop add current profile to the mutable array [profile addObject:currentProfile]; // Now you can set currentProfile to nil currentProfile = nil; } - (IBAction)bringFont:(id)sender { // If you want to display all of this data I would recommend creating a // UITableView and have each entry as a row's title. But thats another // issue so to set them all into the label as you asked: // Loop through the array and add the strings together adding a newline each time NSMutableString *str = [[NSMutableString alloc] init]; for(NSObject *obj in profile) { // Obj will need to be casted to whatever type 'currentProfile' is [str appendFormat:@"\n %@", obj->lastName]; } // Compute what height the UILabel needs to be to display this string CGSize expectedSize = [str sizeWithFont:[UIFont systemFontOfSize:[UIFont systemFontSize]] constrainedToSize:CGSizeMake(320, 9999) lineBreakMode:NSLineBreakByWordWrapping]; CGRect newFrame = CGRectMake(0, 0, expectedSize.width, expectedSize.height); [profilesLabel setFrame:newFrame]; [profilesLabel setText:str]; }

编辑2：

在进一步澄清问题是您没有姓氏之后，请提请您注意以下事实：您在此函数中将所有内容分配给lastName：

if([elementName isEqualToString:@"lastname"]) { currentProfile->lastName = currentNodeContent; NSLog(@"%@",currentProfile->lastName); last_Name.text = currentProfile->lastName; } if([elementName isEqualToString:@"email"]) { currentProfile->lastName = currentNodeContent; NSLog(@"%@",currentProfile->lastName); last_Name.text = currentProfile->lastName; } if([elementName isEqualToString:@"address"]) { currentProfile->lastName = currentNodeContent; NSLog(@"%@",currentProfile->lastName); last_Name.text = currentProfile->lastName; }

在您使用的每个部分中：currentProfile->lastName = currentNodeContent;您需要在currentProfile中设置其他值!!!

如何在UILabel中显示XML解析数据

1 个答案: