iOS Web服务结果到阵列

我使用Web服务获取信息。当我获取字符串结果时，我不能将其写入数组

当我写入

NSLog（@“%@”，字符串）时，在foundCharacters中它正确写入所有值，但写入时：

[myArray addObject:string];
NSLog(@"%@",myArray);

我看到很多空值。如何获取这些值并将其写入数组：(

null（如nil）或null（如NSNulls）？您如何初始化myArray？我正在viewdidload中初始化尝试在
connectionDidFinishLoading
中实例化myArray当我在viewdidload中写入数组nslog时，它似乎再次为null：(
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{

    [datawebservice setLength:0];
}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{

    [datawebservice appendData:data];
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection{

    xmlparserr = [[NSXMLParser alloc] initWithData:datawebservice];
    [xmlparserr setDelegate:self];
    [xmlparserr parse];



}

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{

    elementyedek = elementName;

}

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{

}

-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{


    if ([elementyedek isEqualToString:@"StokAdi"]) {
       [myArray addObject:string];

        NSLog(@"%@",myArray);       

    }


}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{

    NSLog(@"ERROR with theConnection");
}