地理编码的实现

<code class="hljs java has-numbering"></code><h2 id="一效果">一：效果</h2><p>输入地名，可以得到相应的经纬度，知识为了学习写的小Demo 
<img src="http://img.blog.csdn.net/20150822150215458" alt="这里写图片描述" title="" /></p><h2 id="二实现步骤">二：实现步骤</h2><p>一 ：首先获取用户输入的位置。 
二 ：创建地理编码对象。 
三 ：利用地理编码对象编码，根据传入的地址获取该地址对应的经纬度信息。 
四 ：最后将他们分别显示出来就可以了。</p><h2 id="三代码">三：代码</h2>

#<span class="hljs-keyword">import</span> <span class="hljs-string">"ViewController.h"</span>
#<span class="hljs-keyword">import</span> <CoreLocation/CoreLocation.h>

<span class="hljs-annotation">@interface</span> ViewController ()
#pragma mark - 地理编码
<span class="hljs-javadoc">/**
 *  监听地理编码点击事件
 */</span>
- (IBAction)geocodeBtnClick;
<span class="hljs-javadoc">/**
 *  需要编码的地址容器
 */</span>
<span class="hljs-annotation">@property</span> (weak, nonatomic) IBOutlet UITextField *addressField;
<span class="hljs-javadoc">/**
 *  经度容器
 */</span>
<span class="hljs-annotation">@property</span> (weak, nonatomic) IBOutlet UILabel *longitudeLabel;
<span class="hljs-javadoc">/**
 *  纬度容器
 */</span>
<span class="hljs-annotation">@property</span> (weak, nonatomic) IBOutlet UILabel *latitudeLabel;
<span class="hljs-javadoc">/**
 *  详情容器
 */</span>
<span class="hljs-annotation">@property</span> (weak, nonatomic) IBOutlet UILabel *detailAddressLabel;
<span class="hljs-javadoc">/**
 *  地理编码对象
 */</span>
<span class="hljs-annotation">@property</span> (nonatomic ,strong) CLGeocoder *geocoder;
<span class="hljs-annotation">@end</span>

<span class="hljs-annotation">@implementation</span> ViewController

- (<span class="hljs-keyword">void</span>)geocodeBtnClick
{
    <span class="hljs-comment">// 0.获取用户输入的位置</span>
    NSString *addressStr = self.addressField.text;
    <span class="hljs-keyword">if</span> (addressStr == nil || addressStr.length == <span class="hljs-number">0</span>) {
        NSLog(@<span class="hljs-string">"请输入地址"</span>);
        <span class="hljs-keyword">return</span>;
    }


    <span class="hljs-comment">// 1.创建地理编码对象</span>

    <span class="hljs-comment">// 2.利用地理编码对象编码</span>
    <span class="hljs-comment">// 根据传入的地址获取该地址对应的经纬度信息</span>
    [self.geocoder geocodeAddressString:addressStr completionHandler:^(NSArray *placemarks, NSError *error) {

        <span class="hljs-keyword">if</span> (placemarks.count == <span class="hljs-number">0</span> || error != nil) {
            <span class="hljs-keyword">return</span> ;
        }
        <span class="hljs-comment">// placemarks地标数组, 地标数组中存放着地标, 每一个地标包含了该位置的经纬度以及城市/区域/国家代码/邮编等等...</span>
        <span class="hljs-comment">// 获取数组中的第一个地标</span>
        CLPlacemark *placemark = [placemarks firstObject];
<span class="hljs-comment">//        for (CLPlacemark  *placemark in placemarks) {</span>
<span class="hljs-comment">//            NSLog(@"%@ %@ %f %f", placemark.name, placemark.addressDictionary, placemark.location.coordinate.latitude, placemark.location.coordinate.longitude);</span>
        self.latitudeLabel.text = [NSString stringWithFormat:@<span class="hljs-string">"%f"</span>, placemark.location.coordinate.latitude];
        self.longitudeLabel.text = [NSString stringWithFormat:@<span class="hljs-string">"%f"</span>, placemark.location.coordinate.longitude];
        NSArray *address = placemark.addressDictionary[@<span class="hljs-string">"FormattedAddressLines"</span>];
        NSMutableString *strM = [NSMutableString string];
        <span class="hljs-keyword">for</span> (NSString *str in address) {
            [strM appendString:str];
        }
        self.detailAddressLabel.text = strM;

<span class="hljs-comment">//        }</span>



    }];
}
- (CLGeocoder *)geocoder
{
    <span class="hljs-keyword">if</span> (!_geocoder) {
        _geocoder = [[CLGeocoder alloc] init];
    }
    <span class="hljs-keyword">return</span> _geocoder;
}

-(<span class="hljs-keyword">void</span>)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    <span class="hljs-comment">//隐藏键盘</span>
    [self.view endEditing:YES];
}

<span class="hljs-annotation">@end</span>

地理编码的实现

原文：http://blog.csdn.net/shuju345/article/details/47977725