如何使用 iPhone/iOS 编程（Objective-c）使用 wifi/3g IP 地址检索当前城市名称？

发布于 2024-10-30 15:03:26 字数 496 浏览 3 评论 0原文

我想使用设备的 IP 地址（wifi/3g）检索 iPhone 当前的“城市名称”。有什么办法可以做到吗？请帮帮我。

以下是我想要当前位置的地方。

-(BOOL)fetchAndParseRss{

NSString * CurrentLocation = <I want the retrieved Location here!!>;
NSString * URLrss = [NSString stringWithFormat:@"http://news.google.com/news?q=location:%@&output=rss", CurrentLocation];

NSURL *url = [NSURL URLWithString:URLrss]; 
NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:url];
}

实际上我正在为自己开发一个应用程序，显示当前城市的新闻。

原文

I want to retrieve the current "city name" of the iPhone using ip address of device (wifi/3g). Is there any way to do it? please help me out.

Following is the place where I want the current location.

-(BOOL)fetchAndParseRss{

NSString * CurrentLocation = <I want the retrieved Location here!!>;
NSString * URLrss = [NSString stringWithFormat:@"http://news.google.com/news?q=location:%@&output=rss", CurrentLocation];

NSURL *url = [NSURL URLWithString:URLrss]; 
NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:url];
}

Actually i am developing an app for myself that displays the news of current city.

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小鸟爱天空丶 2024-11-06 15:03:26

您可以使用CLLocationManager和MKReverseGeocoder来获取用户所在城市。

首先添加CLLocationManager并开始更新用户位置

- (void)startLocationManager 
{    
    if (locManager==nil)
        locManager = [[CLLocationManager alloc] init];
    if (locManager.locationServicesEnabled)
    {
        NSLog(@"User has opted out of service on it error");
    } else {
        locManager.delegate = self;
        locManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
        [locManager startUpdatingLocation];
    }
}

然后添加位置管理器委托方法以使用MKReverseGeocoder。

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    NSLog(@"Manager error: %@", [error description]);
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
    self.geocoder = [[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate];
    [geocoder release];
    geocoder.delegate = self;
    [geocoder start];
    [manager stopUpdatingLocation];
}

当然，您必须实现 MKReverseGeocoder 委托方法

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error
{
    NSLog(@"reverseGeocoder:%@ didFailWithError:%@", geocoder, error);
}

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark
{   
    // with the placemark you can now retrieve the city name
    NSString *city = [placemark.addressDictionary objectForKey:@"City"];
    NSLog(@"City is %@", city);
}

如果用户向您的应用程序授予位置管理器的权限，则可以使用此方法。

You can use CLLocationManager and MKReverseGeocoder to get users city.

First add CLLocationManager and start updating user location

- (void)startLocationManager 
{    
    if (locManager==nil)
        locManager = [[CLLocationManager alloc] init];
    if (locManager.locationServicesEnabled)
    {
        NSLog(@"User has opted out of service on it error");
    } else {
        locManager.delegate = self;
        locManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
        [locManager startUpdatingLocation];
    }
}

Then add location manager delegate methods to use MKReverseGeocoder.

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    NSLog(@"Manager error: %@", [error description]);
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
    self.geocoder = [[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate];
    [geocoder release];
    geocoder.delegate = self;
    [geocoder start];
    [manager stopUpdatingLocation];
}

and of course you have to implement MKReverseGeocoder Delegate methods

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error
{
    NSLog(@"reverseGeocoder:%@ didFailWithError:%@", geocoder, error);
}

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark
{   
    // with the placemark you can now retrieve the city name
    NSString *city = [placemark.addressDictionary objectForKey:@"City"];
    NSLog(@"City is %@", city);
}

This method can be use if user gives permission to your application for location manager.

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