XML解析並將變量設置爲實例

Question

我創建了一個名爲「event」的類。這個類有三個變量。

主要文件初始化此類的一個實例後，我解析一個XML文件，但當我去檢索創建的實例，我不認識。

我在哪裏錯了？

#import "mkViewController.h" 
#import "evento.h" 

@interface mkViewController()  
@end 

@implementation mkViewController 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    NSURL *url = [NSURL URLWithString:@"http://xxxxx.it/xxx.xml"]; 
    parser = [[NSXMLParser alloc] initWithContentsOfURL:url]; 

    [parser setDelegate:self]; 
    [parser setShouldResolveExternalEntities:NO]; 
    [parser parse]; 

    NSMutableArray *datiEvento = [NSMutableArray array]; 
    evento *eventoTrovato = [[evento init]alloc]; 
} 

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

    if ([element isEqualToString:@"evento"]) {   
     // Create la array dell'evento 
     eventoTrovato.nome = string; **<--- not found eventoTrovato instace** 
    }  
} 

Answer 1

您在viewDidLoad中只創建了局部變量eventoTrovato。如果你想不僅在一個方法來使用它，那麼你必須定義變量或屬性在您的類，如：

@interface mkViewController()  
@property (nonatomic, strong) evento *eventoTrovato; 
@end 

..... 

- (void)viewDidLoad 
{ 
    ....... 
    self.eventoTrovato = [evento new]; 
} 

- (void)parser......... 
{    
    ....... 
    _eventoTrovato.nome = string; 
} 

，如果你想存儲許多元素融入到陣列的另一件事是。該代碼將如下所示：

@interface mkViewController()  
@property (nonatomic, strong) NSMutableArray *datiEvento; 
@end 

- (void)viewDidLoad 
{ 
    ....... 
    self.datiEvento = [NSMutableArray array]; 
} 

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

    if ([element isEqualToString:@"evento"]) { 
     evento *eventoTrovato = [evento new];  
     eventoTrovato.nome = string; 

     [self.datiEvento addObject:eventoTrovato]; 
    }  
}