Question

我提出以下问题。我想在一位理论家增加4个条目,这是xl驱动的。因此,Xml档案中有4个条目。我在Xml parser使用以下代码添加所有条目:

    - (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName
  namespaceURI:(NSString *)namespaceURI
 qualifiedName:(NSString *)qName{ 
    if ([elementName isEqualToString:@"Placemark"]) {
        NSString *batsen = [placemarkData objectForKey:@"name"];
        [Placemarks setObject:placemarkData forKey:batsen];
        NSLog(@"adding story: %@", batsen);
    }
}

问题在于,它像他凌驾于商标上的条目。如果我读到原木档案,我只看上去。之所以如此奇怪,是因为记录(介绍故事)确实显示4个标识信息。

I use the following code to read out the Placemark dictionary:

NSEnumerator *enumerator = [appDelegate.Placemarks keyEnumerator];
id key;

while ((key = [enumerator nextObject])) {

    /* code that uses the returned key */
    NSString *theElement = key;
    NSLog(@"Element: %@", theElement);
}

是否有任何建议? 预支款项

Answer 1

当你确定安全等级表现有钥匙的价值时,以前的价值即予以公布:

If aKey already exists in the dictionary, 
the dictionary’s previous value object for that key is sent a release message 
and anObject takes its place.

rel=“nofollow”>c.f on NSMutableDictionary in Rainbow/a>

就你而言,你的词典钥匙应绘制成一个阵列(NSMutableArray),以便你储存一个指4×ml元素的钥匙。

Answer 2

NSMutableDictionary is required to add items to a dictionary. 该法典采用国家统一法,简化新的、扩大的可变性NSDictionary:

// Make an immutable dictionary by combining 2 dictionaries (new entries are added, old entries are updated)
+ (NSDictionary *)dictionaryFromDictionary:(NSDictionary *)original WithAddedEntries:(NSDictionary *)entriesToAdd
{
    NSMutableDictionary *final = [NSMutableDictionary dictionaryWithDictionary:original];
    [final addEntriesFromDictionary:entriesToAdd];
    // Done
    return [NSDictionary dictionaryWithDictionary:final];
}

友情链接