ObjC 解析 NSArray 中的 xml 和库存值

Question

我的 xlm 阅读器有问题。我有一些货币骑手我想存入一个数组，但我的代码有问题。

这是我想阅读的提要： http://www.ecb.int/stats/eurofxref/eurofxref-daily.xml

错误在

头文件

@class Convertisseur;


@interface Convertisseur1ViewController : 
   UIViewController <UITextFieldDelegate>{

    IBOutlet UILabel *usd;
    IBOutlet UILabel *euro;
 Convertisseur *convertisseur;


     // parser XML
    NSXMLParser *rssParser;
     // elenco degli elementi letti dal feed
    NSMutableArray *elencoFeed;

     //variabile temporanea pe ogni elemento
    NSMutableDictionary *item;

     // valori dei campi letti dal feed
    NSString *currentElement;
    NSMutableString *currentCube;

    NSArray *currency;
}


//Dichiarazion del parser
 - (void)parseXMLFileAtURL:(NSString *)URL;
@end

实现文件

#import "Convertisseur1ViewController.h"
#import "Convertisseur.h"

@implementation Convertisseur1ViewController




- (void)parseXMLFileAtURL:(NSString *)URL {
  // inizializziamo la lista degli elementi
 elencoFeed = [[NSMutableArray alloc] init];

  // dobbiamo convertire la stringa "URL" in un elemento "NSURL"
 NSURL *xmlURL = [NSURL URLWithString:URL];

  // inizializziamo il nostro parser XML
 rssParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL];

 [rssParser setDelegate:self];

  // settiamo alcune proprietà
 [rssParser setShouldProcessNamespaces:NO];
 [rssParser setShouldReportNamespacePrefixes:NO];
 [rssParser setShouldResolveExternalEntities:NO];

  // avviamo il parsing del feed RSS
 [rssParser parse];
}




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

 currentElement = [elementName copy];
 if ([elementName isEqualToString:@"item"]) {
   // inizializza tutti gli elementi
  item = [[NSMutableDictionary alloc] init];
  currentCube = [[NSMutableString alloc] init];
 }
}

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

 if ([elementName isEqualToString:@"Cube"]) {
  /* salva tutte le proprietà del feed letto nell'elemento "item", per
   poi inserirlo nell'array "elencoFeed" */
  [item setObject:currentCube forKey:@"Cube"];

  [elencoFeed addObject:[item copy]];
 }
}




- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{;
  // salva i caratteri per l'elemento corrente
 if ([currentElement isEqualToString:@"Cube"]){
  [currentCube appendString:string];
 }
}






- (void) parserDidEndDocument:(NSXMLParser *)parser {


 for(int i=1;i<[elencoFeed count];i++) {

  [currency setvalue:[[elencoFeed Objectatindex:i] valueforkey:@"rate"] forkey:[[elencoFeed Objectatindex:i] valueforkey:@"currency"]];
  //currency[i]= [elencoFeed Objectatindex:i] valueforkey:@"rate"] forkey:[[elencoFeed Objectatindex:i] valueforkey:@"currency"];

 }

}



 - (void)viewDidLoad {
 [super viewDidLoad];
 convertisseur = [[Convertisseur alloc] init];


  self.title = @"Convertisseur";

  NSString *path = @"http://www.ecb.int/stats/eurofxref/eurofxref-daily.xml";
  [self parseXMLFileAtURL:path];
  euro.text =  currency.text;
 }



- (void)viewDidUnload {
  // Release any retained subviews of the main view.
  // e.g. self.myOutlet = nil;
 self.labelEuro = nil;
 self.labelDollar = nil;
 self.convertisseur = nil;

 }



- (void)dealloc {
    [super dealloc];
}

这里有一个警告：

 [currency setvalue:[[elencoFeed Objectatindex:i] valueforkey:@"rate"] forkey:[[elencoFeed Objectatindex:i] valueforkey:@"currency"]];

NSMutable 数组可能无法响应“-objectindex”

这里有个错误：

euro.text =  currency.text;

以非结构或联合的形式请求成员“文本”（货币是数组，欧元是标签）

Answer 1

Objective C 区分大小写。正确的签名是objectAtIndex:（在其他一些地方还有valueForKey:和setValue:forKey:）。

您对currency.text 有什么期望？这是NSArray 的一个实例，它没有text 属性。

旁注：我认为人们应该在代码中完全避免使用母语。但是你绝对不应该在意大利语和英语之间混用。选择一个并坚持下去（最好是英文）。