UIPickerView的內容取決於另一個UIPickerView的選擇

我有兩個UIPickerView。第一個包含世界國家。當用戶選擇一個國家時，我會聯繫一個網絡服務來檢索這個國家的城市。所有的工作都適合我，但只有當我第一次選擇這個國家的時候。但是當我第二次選擇這個國家時，第一次展示的城市就在那裏。這是我的代碼。它看起來像UIPickerView的內容不能是chnage。UIPickerView的內容取決於另一個UIPickerView的選擇

- (NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component 
{ 
    NSString *codeCity; 
    codeCity=[countriesArray objectAtIndex:row]; 

    if([pickerView tag] == 1) 
    { 
     NSString *codeCity; 
    codeCity=[countriesArray objectAtIndex:row]; 

     return [countriesArray objectAtIndex:row]; 
    } 
    else 

    return [citiesArray objectAtIndex:row]; 
} 

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView { 
    return 1; 
} 

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component 
{ 
    if([pickerView tag] == 1) 
     return [countriesCodeArray count]; 
    else 
     return [citiesArray count]; 

} 

- (void)onLocationSelection { 

    NSInteger row = [self.countrys selectedRowInComponent:0]; 
    if(([countriesArray count])!=0) 
    { 
     if ([countryField isFirstResponder]) 
     { 

      choosedCodeCity=[countriesCodeArray objectAtIndex:row]; 
      choosedNameCity=[countriesArray objectAtIndex:row]; 
      countryField.text = choosedNameCity; 
      [countryField resignFirstResponder]; 
      [self getCities]; 
      NSLog(@"get cities() %@",choosedCodeCity); 
     } 

-(void)getCities 
{ 
    NSString * myURLString = [NSString stringWithFormat:@"http://localhost:8080/Data/resources/converter.city/CountryCode/%@",choosedCodeCity]; 

    NSURL *url =[NSURL URLWithString:myURLString]; 
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url]; 
    [request setDelegate:self]; 
    request.didFinishSelector = @selector(resultCities:); 
    request.didFailSelector = @selector(resultCitiesError:); 

    [request startAsynchronous]; 


} 


-(void)resultCities :(ASIHTTPRequest *)request 
{ 
    [citiesArray release]; 
    citiesArray= [[NSMutableArray alloc] init]; 

    NSString *responseString = [request responseString]; 
    NSDictionary *json = [responseString JSONValue]; 
    // NSLog(@"%@",json); 

    for (int i=0; i<[json count]; i++) 
    { 



      [citiesArray addObject:[[json objectAtIndex:i] objectForKey:@"name"]]; 



    NSLog(@"cities on citiesArray %@ ", citiesArray); 

     } 
    }

我每次更改縣的NSLog上citiesArray @「的城市......在resultCities告訴我新選定國家的新城市，所以這個問題是不存在的

來源

2011-12-09 user567

你在哪裏重裝pickerview？ – Aravindhan

@Trisha我必須重新加載它？ – user567

我加入[pickerView reloadAllComponents]在resultCities，它做工精細，謝謝 – user567

放 - （空） onLocationSelection {} 再次代碼。

來源

2012-01-10 11:48:26

UIPickerView的內容取決於另一個UIPickerView的選擇

回答

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