在我的plist文件中訪問兩個級別

Question

我有一個包含國家，州，城市的plist文件。我可以進入採購員的國家級別，但我似乎無法獲得州和市人口。我創建了一個plist文件，內容如下：country - > dictionary，state - > dictionary和city - > array。

的代碼是：

NSBundle *bundle = [NSBundle mainBundle]; 
NSString *plistPath = [bundle pathForResource:@"placesdictionary" ofType:@"plist"]; 
NSDictionary *dictionary = [[NSDictionary alloc] initWithContentsOfFile:plistPath]; 
self.places = dictionary; 
NSArray *componentsCountry = [self.places allKeys]; 
NSArray *sortedCountry = [componentsCountry sortedArrayUsingSelector:@selector(compare:)]; 
self.country = sortedCountry; 
NSString *selectedCountry = [country objectAtIndex:0]; 

這是好的。但下面的代碼有錯誤：

NSArray *componentsState = [self.places allKeysForObject:selectedCountry]; 
NSArray *sortedState = [componentsState sortedArrayUsingSelector:@selector(compare:)]; 
self.state = sortedState; 
NSString *selectedState = [state objectAtIndex:0]; 
NSArray *componentsCity = [self.places objectForKey:selectedState]; 
NSArray *sortedCity = [componentsCity sortedArrayUsingSelector:@selector(compare:)]; 
self.city = sortedCity; 

你能幫我解決這個問題嗎？謝謝。

這是我的plist文件：

<?xml version="1.0" encoding="UTF-8"?> 
    <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> 
    <plist version="1.0"> 
    <dict> 
     <key>France</key> 
     <dict> 
      <key>state 3</key> 
      <array> 
       <string>Paris</string> 
      </array> 
      <key>state 2</key> 
      <array> 
       <string>Nice</string> 
      </array> 
     </dict> 
     <key>US</key> 
     <dict> 
      <key>california</key> 
      <array> 
       <string>LA</string> 
       <string>San Fran</string> 
       <string>San Diego</string> 
      </array> 
      <key>new jersey</key> 
      <array> 
       <string>riverdale</string> 
       <string>newark</string> 
       </array> 
     </dict> 
    </dict> 
    </plist> 

Answer 1

我會建議使用這種代碼，用於訪問的plist數據：

NSString *errorDesc = nil; 
NSPropertyListFormat format; 
NSData *plistXML = [[NSFileManager defaultManager] contentsAtPath:[[NSBundle mainBundle] pathForResource:@"placesdictionary" ofType:@"plist"]]; 
NSMutableDictionary *properties = (NSMutableDictionary *)[NSPropertyListSerialization propertyListFromData:plistXML mutabilityOption:NSPropertyListMutableContainersAndLeaves format:&format errorDescription:&errorDesc]; 
NSDictionary *france = (NSDictionary *)[properties valueForKey:@"France"]; 
// if cities is in countries then you can access them using [countries valueForKey:@"cityName"]; 
NSArray *cities = [france valueForKey:@"state 3"];