使用的NSXMLParser

Question

可能重複解析谷歌的天氣XML：
it's a google weather api?how to parse such kind of data using NSXML?

我試圖做一個天氣應用程序。我能得到一個返回下面的XML輸出（對不起，壞的格式），谷歌的天氣API

<?xml version="1.0"?><xml_api_reply version="1"><weather module_id="0" tab_id="0" mobile_row="0" mobile_zipped="1" row="0" section="0" ><forecast_information><city data="Detroit, MI"/><postal_code data="Detroit"/><latitude_e6 data=""/><longitude_e6 data=""/><forecast_date data="2012-02-09"/><current_date_time data="2012-02-09 21:53:00 +0000"/><unit_system data="US"/></forecast_information><current_conditions><condition data="Clear"/><temp_f data="37"/><temp_c data="3"/><humidity data="Humidity: 48%"/><icon data="/ig/images/weather/sunny.gif"/><wind_condition data="Wind: SW at 15 mph"/></current_conditions><forecast_conditions><day_of_week data="Thu"/><low data="25"/><high data="40"/><icon data="/ig/images/weather/sunny.gif"/><condition data="Clear"/></forecast_conditions><forecast_conditions><day_of_week data="Fri"/><low data="13"/><high data="38"/><icon data="/ig/images/weather/snow.gif"/><condition data="Snow Showers"/></forecast_conditions><forecast_conditions><day_of_week data="Sat"/><low data="18"/><high data="23"/><icon data="/ig/images/weather/mostly_sunny.gif"/><condition data="Mostly Sunny"/></forecast_conditions><forecast_conditions><day_of_week data="Sun"/><low data="20"/><high data="27"/><icon data="/ig/images/weather/mostly_sunny.gif"/><condition data="Mostly Sunny"/></forecast_conditions></weather></xml_api_reply> 

我能獲得當前溫度什麼我無法獲得對於其餘部分的溫度值XML中一週的日子。我讀了蘋果文檔，並用google搜索了一下，但我不確定如何使用蘋果NSXMLParser api解析這個字符串。我不想處理其他外部解析器或將它們包含在我的項目中，因爲我的需求非常簡單。以下是我迄今已實現的代碼

- (IBAction)GetCurrentWeather 
{ 

    NSString * location = @"Detroit"; 
    NSString * address = @"http://www.google.co.uk/ig/api?weather="; 
    NSString * request = [NSString stringWithFormat:@"%@%@",address,location]; 
    NSURL *URL = [NSURL URLWithString:request]; 
    NSError *error;  
    NSString *XML = [NSString stringWithContentsOfURL:URL encoding:NSASCIIStringEncoding error:&error]; 

    //NSLog(@"XML: %@", XML); 

    // Extract current temperature the 'dirty' way 
    //NSString *tempInC = [[[[XML componentsSeparatedByString:@"temp_c data=\""] objectAtIndex:1] componentsSeparatedByString:@"\""] objectAtIndex:0]; 
    NSString *tempInF = [[[[XML componentsSeparatedByString:@"temp_f data=\""] objectAtIndex:1] componentsSeparatedByString:@"\""] objectAtIndex:0]; 
    NSString *city = [[[[XML componentsSeparatedByString:@"city data=\""] objectAtIndex:1] componentsSeparatedByString:@"\""] objectAtIndex:0]; 
    //NSString *condition = [[[[XML componentsSeparatedByString:@"condition data=\""] objectAtIndex:1] componentsSeparatedByString:@"\""] objectAtIndex:0]; 
    NSString *humidity = [[[[XML componentsSeparatedByString:@"humidity data=\""] objectAtIndex:1] componentsSeparatedByString:@"\""] objectAtIndex:0]; 
    NSString *wind = [[[[XML componentsSeparatedByString:@"wind_condition data=\""] objectAtIndex:1] componentsSeparatedByString:@"\""] objectAtIndex:0]; 

    NSString *dayOfWeek = [[[[XML componentsSeparatedByString:@"day_of_week data=\""] objectAtIndex:1] componentsSeparatedByString:@"\""] objectAtIndex:0]; 

    //NSLog(@"It's dayOfWeek %@", dayOfWeek); 
    //NSLog(@"It's tempInC %@ degrees", tempInC); 
    //NSLog(@"It's tempInF %@ degrees", tempInF); 
    //NSLog(@"It's city %@", city); 
    //NSLog(@"It's condition %@", condition); 

    NSString *tempStrToDisp = [NSString stringWithFormat: @"Temp: %@F", tempInF]; 

//THIS ALL WORKS!!! 
     textLable1.text = city; 
     textLable2.text = tempStrToDisp; 
     textLable3.text = humidity; 
     textLable4.text = wind; 

    NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:URL]; 
    [parser setDelegate:self]; 
    [parser parse]; 

} 


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

    NSLog(@"XML Parser 1 ..."); 
    NSLog(@"elementName ... %@", elementName); 




//HOW TO GET rest of the week high/low temp VALUES HERE? 
} 

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

    NSLog(@"XML Parser 2 ..."); 

    //HOW TO GET VALUES HERE? 
} 

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName 
{ 
    NSLog(@"XML Parser 3 ..."); 
    //HOW TO GET VALUES HERE? 
} 

Answer 1

如果其他人將來有興趣解析此XML字符串，那麼就是這樣。請爲我的答案，如果它的工作對你

-(IBAction) GetLocalWeather 
{ 

    NSString *location = @"Detroit"; 
NSString *address = @"http://www.google.co.uk/ig/api?weather="; 
    NSString *request = [NSString stringWithFormat:@"%@%@",address,location]; 
    NSURL *URL = [NSURL URLWithString:request]; 
    NSError *error;  
    NSString *XML = [NSString stringWithContentsOfURL:URL encoding:NSASCIIStringEncoding error:&error]; 

    //NSLog(@"XML: %@", XML); 

    // Extract current temperature the 'dirty' way 
    NSString *tempInC = [[[[XML componentsSeparatedByString:@"temp_c data=\""] objectAtIndex:1] componentsSeparatedByString:@"\""] objectAtIndex:0]; 
    NSString *tempInF = [[[[XML componentsSeparatedByString:@"temp_f data=\""] objectAtIndex:1] componentsSeparatedByString:@"\""] objectAtIndex:0]; 
    NSString *city = [[[[XML componentsSeparatedByString:@"city data=\""] objectAtIndex:1] componentsSeparatedByString:@"\""] objectAtIndex:0]; 
    NSString *condition = [[[[XML componentsSeparatedByString:@"condition data=\""] objectAtIndex:1] componentsSeparatedByString:@"\""] objectAtIndex:0]; 
    NSString *humidity = [[[[XML componentsSeparatedByString:@"humidity data=\""] objectAtIndex:1] componentsSeparatedByString:@"\""] objectAtIndex:0]; 
    NSString *wind = [[[[XML componentsSeparatedByString:@"wind_condition data=\""] objectAtIndex:1] componentsSeparatedByString:@"\""] objectAtIndex:0]; 

arryDataMutable = [[NSMutableArray alloc] init]; 

    //TEST 
    NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:URL]; 
    [parser setDelegate:self]; 
    [parser parse]; 

    int arrySizInt = [arryDataMutable count]; 
    //NSLog(@"[arryDataMutable count]: %d", arrySizInt); 



    /* Weather Conditions 
    Clear 
    Cloudy 
    Fog 
    Haze 
    Light Rain 
    Mostly Cloudy 
    Overcast 
    Partly Cloudy 
    Rain 
    Rain Showers 
    Showers 
    Thunderstorm 
    Chance of Showers 
    Chance of Snow 
    Chance of Storm 
    Mostly Sunny 
    Partly Sunny 
    Scattered Showers 
    Sunny 
    */ 

    //We will only get 4 day forecast including current day 

    //initialize counter 
    int counter = 0; 

    //skip first entry, its always current day condition 
    for (int i=1; i<arrySizInt; i++) 
    { 
     //NSLog(@"Array: %@", [arryDataMutable objectAtIndex:i]); 

     NSString *dayStr = [[NSString alloc] initWithString:[arryDataMutable objectAtIndex:i]]; 

     //all week-days 
     if ([dayStr isEqualToString:@"Mon"] || 
      [dayStr isEqualToString:@"Tue"] || 
      [dayStr isEqualToString:@"Wed"] || 
      [dayStr isEqualToString:@"Thu"] || 
      [dayStr isEqualToString:@"Fri"] || 
      [dayStr isEqualToString:@"Sat"] || 
      [dayStr isEqualToString:@"Sun"]) 
     { 

      //NSLog(@"counter: %d", counter); 

      //get the next 3 values from the array 
      //Its always going to be a pair of 4 values 
      NSString *lowStr = [[NSString alloc] initWithString:[arryDataMutable objectAtIndex:(i+1)]]; 
      NSString *highStr = [[NSString alloc] initWithString:[arryDataMutable objectAtIndex:(i+2)]]; 
      NSString *conditionStr = [[NSString alloc] initWithString:[arryDataMutable objectAtIndex:(i+3)]]; 

      NSString *tempStrToDisp = [NSString stringWithFormat: @"%@ H:%@ L:%@", dayStr, highStr, lowStr]; 


      //cell-1 
      if (counter == 0) 
      { 

       textLable1.text = tempStrToDisp; 

      } 

      //cell-2 
      if (counter == 1) 
      { 

       textLable2.text = tempStrToDisp; 
      } 

      //cell-3 
      if (counter == 2) 
      { 

       textLable3.text = tempStrToDisp; 
      } 

      //cell-4 
      if (counter == 3) 
      { 

       textLable4.text = tempStrToDisp; 
      } 

      //increment 
      //This will only get incremented 4 times 
      counter = counter + 1; 
     } 


    }//End-for-loop 
} 

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

    //NSLog(@"XML Parser 1 ... elementName ... %@", elementName); 


    if ([elementName isEqualToString:@"day_of_week"]) 
    { 
     NSString *tempStr = [attributeDict objectForKey:@"data"]; 
     //NSLog(@"day-of-week: %@", tempStr); 

     [arryDataMutable addObject:tempStr]; 

    } 

    if ([elementName isEqualToString:@"low"]) 
    { 
     NSString *tempStr = [attributeDict objectForKey:@"data"]; 
     [arryDataMutable addObject:tempStr]; 

    } 

    if ([elementName isEqualToString:@"high"]) 
    { 
     NSString *tempStr = [attributeDict objectForKey:@"data"]; 
     [arryDataMutable addObject:tempStr]; 

    } 

    if ([elementName isEqualToString:@"condition"]) 
    { 
     NSString *tempStr = [attributeDict objectForKey:@"data"]; 
     [arryDataMutable addObject:tempStr]; 
    } 



} 

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

    //NSLog(@"XML Parser 2 ..."); 
    //NSLog(@"string ... %@", string); 

} 

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName 
{ 
    //NSLog(@"XML Parser 3 ..."); 
    //NSLog(@"elementName: %@", elementName); 
    //NSLog(@"namespaceURI: %@", namespaceURI); 
    //NSLog(@"qName: %@", qName); 
}