通过地点名得到经纬度

最新推荐文章于 2025-03-03 12:07:44 发布

转载最新推荐文章于 2025-03-03 12:07:44 发布 · 945 阅读

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#output #encoding #csv #url

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方法一
//
// MapHelper.m
// JiaoTong
//
// Created by MOL on 11-6-17.
// Copyright 2011 MOL. All rights reserved.
//

#import "MapHelper.h"

#import "JSON.h"

@implementation MapHelper

+ (CLLocationCoordinate2D)getPostion:(NSString *)address
{
   NSString *googleURL = [NSString stringWithFormat:@"http://maps.google.com/maps/api/geocode/json?address=%@&sensor=true",
                           [address stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

   CLLocationCoordinate2D position;
   position.latitude = 0.0;
   position.longitude = 0.0;

   NSError *error;
    NSString *retstr = [NSString stringWithContentsOfURL:[NSURL URLWithString:googleURL] encoding:NSUTF8StringEncoding error:&error];
   if (retstr)
   {
//       NSLog(@"retstr: %@", retstr);
       NSDictionary *dict = [retstr JSONValue];
       if (dict)
       {
           NSArray *results = [dict objectForKey:@"results"];
           if (results && results.count > 0)
           {
               NSDictionary *geometry = [[results objectAtIndex:0] objectForKey:@"geometry"];
               NSDictionary *location = [geometry objectForKey:@"location"];
               position.latitude = [[location objectForKey:@"lat"] doubleValue];
               position.longitude = [[location objectForKey:@"lng"] doubleValue];
           }
       }
   }
   else
   {
       NSLog(@"error: %@", error);
   }

   return position;
}

@end

方法二根据地址查经纬度

NSString*address = @"tokyo";

   //查詢經緯度
    NSString*output = @"csv";
    NSString*key = @"YouKey";
    NSString*urlStr = [NSStringstringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=%@&key=%@",address,output,key];

    NSURL *url =[NSURL URLWithString:urlStr];

    NSString*retstr = [NSString stringWithContentsOfURL:urlencoding:NSUTF8StringEncoding error:nil];

    NSArray*resultArray = [retstr componentsSeparatedByString:@","];

    doublelatitude = [[resultArray objectAtIndex:2] doubleValue];
    doublelongitude = [[resultArray objectAtIndex:3] doubleValue];