如何从 iOS 中的用户获取当前位置

如何从 iOS 中的用户获取当前位置？

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使用 CoreLocation 框架访问用户的位置信息。您将需要实例化一个 CLLocationManager对象并调用异步 StartUpdatingLocation消息。您将通过提供的 CLLocationManager 委托获得用户位置的回调。

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Xcode 文档拥有丰富的知识和示例应用程序——请查看 位置感知编程指南。

定位我示例项目说明了修改 CLLocationManager的不同精度设置的效果

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最佳答案

RedBlueThing 的答案对我来说非常有用。

头

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>


@interface yourController : UIViewController <CLLocationManagerDelegate> {
CLLocationManager *locationManager;
}


@end

主文件

在 init 方法中

locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];

回调功能

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
NSLog(@"OldLocation %f %f", oldLocation.coordinate.latitude, oldLocation.coordinate.longitude);
NSLog(@"NewLocation %f %f", newLocation.coordinate.latitude, newLocation.coordinate.longitude);
}

IOS6

在 iOS6中，不推荐使用委托函数

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations

因此得到新的位置使用

[locations lastObject]

IOS8

在 iOS8中，在开始更新位置之前，应该明确要求许可

locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;


if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
[self.locationManager requestWhenInUseAuthorization];


[locationManager startUpdatingLocation];

您还必须为应用程序的 Info.plist 中的 NSLocationAlwaysUsageDescription或 NSLocationWhenInUseUsageDescription键添加一个字符串。否则对 startUpdatingLocation的调用将被忽略，并且您的委托将不会收到任何回调。

并在结束时，您完成读取位置呼叫停止更新位置在合适的地方。

[locationManager stopUpdatingLocation];
小开

在 iOS6中,

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation

不推荐。

改为使用以下代码

- (void)locationManager:(CLLocationManager *)manager
didUpdateLocations:(NSArray *)locations {
CLLocation *location = [locations lastObject];
NSLog(@"lat%f - lon%f", location.coordinate.latitude, location.coordinate.longitude);
}

对于 iOS6 ~ 8，上述方法仍然是必要的，但你必须处理授权。

_locationManager = [CLLocationManager new];
_locationManager.delegate = self;
_locationManager.distanceFilter = kCLDistanceFilterNone;
_locationManager.desiredAccuracy = kCLLocationAccuracyBest;


if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0 &&
[CLLocationManager authorizationStatus] != kCLAuthorizationStatusAuthorizedWhenInUse
//[CLLocationManager authorizationStatus] != kCLAuthorizationStatusAuthorizedAlways
) {
// Will open an confirm dialog to get user's approval
[_locationManager requestWhenInUseAuthorization];
//[_locationManager requestAlwaysAuthorization];
} else {
[_locationManager startUpdatingLocation]; //Will update location immediately
}

这是处理用户授权的委托方法

#pragma mark - CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager*)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
switch (status) {
case kCLAuthorizationStatusNotDetermined: {
NSLog(@"User still thinking..");
} break;
case kCLAuthorizationStatusDenied: {
NSLog(@"User hates you");
} break;
case kCLAuthorizationStatusAuthorizedWhenInUse:
case kCLAuthorizationStatusAuthorizedAlways: {
[_locationManager startUpdatingLocation]; //Will update location immediately
} break;
default:
break;
}
}
小开

试试这个简单的步骤... 。

注意: 如果您使用模拟器方式，请检查设备位置纬度和经度。默认情况下它不仅。

步骤1: 导入. h 文件中的 CoreLocation框架

#import <CoreLocation/CoreLocation.h>

步骤2: 添加委托 CLLocationManagergenerate

@interface yourViewController : UIViewController<CLLocationManagerDelegate>
{
CLLocationManager *locationManager;
CLLocation *currentLocation;
}

步骤3: 在类文件中添加此代码

- (void)viewDidLoad
{
[super viewDidLoad];
[self CurrentLocationIdentifier]; // call this method
}

步骤4: 检测当前位置的方法

//------------ Current Location Address-----
-(void)CurrentLocationIdentifier
{
//---- For getting current gps location
locationManager = [CLLocationManager new];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
//------
}

步骤5: 使用此方法获取位置

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
currentLocation = [locations objectAtIndex:0];
[locationManager stopUpdatingLocation];
CLGeocoder *geocoder = [[CLGeocoder alloc] init] ;
[geocoder reverseGeocodeLocation:currentLocation completionHandler:^(NSArray *placemarks, NSError *error)
{
if (!(error))
{
CLPlacemark *placemark = [placemarks objectAtIndex:0];
NSLog(@"\nCurrent Location Detected\n");
NSLog(@"placemark %@",placemark);
NSString *locatedAt = [[placemark.addressDictionary valueForKey:@"FormattedAddressLines"] componentsJoinedByString:@", "];
NSString *Address = [[NSString alloc]initWithString:locatedAt];
NSString *Area = [[NSString alloc]initWithString:placemark.locality];
NSString *Country = [[NSString alloc]initWithString:placemark.country];
NSString *CountryArea = [NSString stringWithFormat:@"%@, %@", Area,Country];
NSLog(@"%@",CountryArea);
}
else
{
NSLog(@"Geocode failed with error %@", error);
NSLog(@"\nCurrent Location Not Detected\n");
//return;
CountryArea = NULL;
}
/*---- For more results
placemark.region);
placemark.country);
placemark.locality);
placemark.name);
placemark.ocean);
placemark.postalCode);
placemark.subLocality);
placemark.location);
------*/
}];
}
小开

你可以用我写的 这项服务为你处理一切。

此服务将请求权限并处理 CLLocationManager 的处理，因此您不必这样做。

使用方法如下:

LocationService.getCurrentLocationOnSuccess({ (latitude, longitude) -> () in
//Do something with Latitude and Longitude


}, onFailure: { (error) -> () in


//See what went wrong
print(error)
})
小开

在 Swift 中(适用于 iOS8 +)。

Info.plist

要事第一。您需要在 info.plist 文件中为键 NSLocationWhenInUseUsageDescription或 NSLocationAlwaysUsageDescription添加描述性字符串，具体取决于请求的服务类型

密码

import Foundation
import CoreLocation


class LocationManager: NSObject, CLLocationManagerDelegate {
    

let manager: CLLocationManager
var locationManagerClosures: [((userLocation: CLLocation) -> ())] = []
    

override init() {
self.manager = CLLocationManager()
super.init()
self.manager.delegate = self
}
    

//This is the main method for getting the users location and will pass back the usersLocation when it is available
func getlocationForUser(userLocationClosure: ((userLocation: CLLocation) -> ())) {
        

self.locationManagerClosures.append(userLocationClosure)
        

//First need to check if the apple device has location services availabel. (i.e. Some iTouch's don't have this enabled)
if CLLocationManager.locationServicesEnabled() {
//Then check whether the user has granted you permission to get his location
if CLLocationManager.authorizationStatus() == .NotDetermined {
//Request permission
//Note: you can also ask for .requestWhenInUseAuthorization
manager.requestWhenInUseAuthorization()
} else if CLLocationManager.authorizationStatus() == .Restricted || CLLocationManager.authorizationStatus() == .Denied {
//... Sorry for you. You can huff and puff but you are not getting any location
} else if CLLocationManager.authorizationStatus() == .AuthorizedWhenInUse {
// This will trigger the locationManager:didUpdateLocation delegate method to get called when the next available location of the user is available
manager.startUpdatingLocation()
}
}
        

}
    

//MARK: CLLocationManager Delegate methods
    

@objc func locationManager(manager: CLLocationManager, didChangeAuthorizationStatus status: CLAuthorizationStatus) {
if status == .AuthorizedAlways || status == .AuthorizedWhenInUse {
manager.startUpdatingLocation()
}
}
    

func locationManager(manager: CLLocationManager, didUpdateToLocation newLocation: CLLocation, fromLocation oldLocation: CLLocation) {
//Because multiple methods might have called getlocationForUser: method there might me multiple methods that need the users location.
//These userLocation closures will have been stored in the locationManagerClosures array so now that we have the users location we can pass the users location into all of them and then reset the array.
let tempClosures = self.locationManagerClosures
for closure in tempClosures {
closure(userLocation: newLocation)
}
self.locationManagerClosures = []
}
}

用法

self.locationManager = LocationManager()
self.locationManager.getlocationForUser { (userLocation: CLLocation) -> () in
print(userLocation)
}
小开

IOS 11.x Swift 4.0 Plist 需要这两个属性

<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>We're watching you</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>Watch Out</string>

还有这段代码... ... 确保你的代码是 CLLocationManager 委托

let locationManager = CLLocationManager()


// MARK location Manager delegate code + more


func locationManager(_ manager: CLLocationManager, didChangeAuthorization status: CLAuthorizationStatus) {
switch status {
case .notDetermined:
print("User still thinking")
case .denied:
print("User hates you")
case .authorizedWhenInUse:
locationManager.stopUpdatingLocation()
case .authorizedAlways:
locationManager.startUpdatingLocation()
case .restricted:
print("User dislikes you")
}

当然，这段代码也可以放到 viewDidLoad ()中。

locationManager.delegate = self
locationManager.requestAlwaysAuthorization()
locationManager.distanceFilter = kCLDistanceFilterNone
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestLocation()

这两个是为了请求位置让你动起来，也就是省得你离开座位:)

func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {
print(error)
}


func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
print(locations)
}
小开

对于 Swift 5，这里有一个简短的课程来获取位置:

class MyLocationManager: NSObject, CLLocationManagerDelegate {
let manager: CLLocationManager


override init() {
manager = CLLocationManager()
super.init()
manager.delegate = self
manager.distanceFilter = kCLDistanceFilterNone
manager.desiredAccuracy = kCLLocationAccuracyBest
manager.requestWhenInUseAuthorization()
manager.startUpdatingLocation()
}


func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
// do something with locations
}
}

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