Question

我试图从rss feed的cdata中抓取图像 - 我可以将图像很好地添加到mutablearray中，但是当我记录数组时，它总是只包含最新的图片网址 - 帮忙？

这就是我所拥有的：

- (void)viewDidLoad {
    [super viewDidLoad];
    NSXMLParser *parser = [[NSXMLParser alloc]initWithContentsOfURL:[NSURL URLWithString:@"http://somewebsite.com/feed"]];
    [parser setDelegate:self];
    [parser parse];
    NSLog(@"VIEWDIDLOAD SAYS: %@",self.imageURLS);
}

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
    element = elementName;
    if ([element isEqualToString:@"item"] || [element isEqualToString:@"entry"]) {
        self.imageURLS = [[NSMutableArray alloc]init];
        description = [[NSMutableString alloc] init];
    }
}

- (void)parser:(NSXMLParser *)parser foundCDATA:(NSData *)CDATABlock {
    if([element isEqualToString:@"description"]) {
        self.imageSource = nil;

        NSString *someString = [[NSString alloc] initWithData:CDATABlock encoding:NSUTF8StringEncoding];
        self.imageSource = [self getFirstImageUrl:someString];

        if (self.imageSource)
            NSLog(@"IMAGE URL STRING %@", self.imageSource);
    }
}

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
    if ([element  isEqualToString:@"description"]) {
        [self.imageURLS addObject:self.imageSource];
        NSLog(@"ImageURLS: %@", self.imageURLS);
    }
}

-(NSString *)getFirstImageUrl: (NSString *) html {
    NSScanner *theScanner;
    NSString *imageURL = nil;

    theScanner = [NSScanner scannerWithString: html];

    // find start of tag
    [theScanner scanUpToString: @"<img" intoString: NULL];
    if ([theScanner isAtEnd] == NO) {

        [theScanner scanUpToString: @"src=\"" intoString: NULL];
        NSInteger newLoc2 = [theScanner scanLocation] + 5;
        [theScanner setScanLocation: newLoc2];

        // find end of tag
        [theScanner scanUpToString: @"\"" intoString: &imageURL];
    }

    return imageURL;
}

Answer 1

你在说：

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
    element = elementName;
    if ([element isEqualToString:@"item"] || [element isEqualToString:@"entry"]) {
        self.imageURLS = [[NSMutableArray alloc]init];
        description = [[NSMutableString alloc] init];
    }
}

这不可能是正确的，因为这意味着每次时间遇到 new ＆＃34; item＆＃34;或＆＃34;条目＆＃34;你将扔掉现有的self.imageURLS并用空数组替换它。

NSXMLParser替换索引0而不是添加到可变数组

1 个答案: