在所有州应用程序中捕获位置

Question

我想知道如何在应用程序未运行时捕获位置并保存数据库。已经遵循了几个教程，但没有一个有效。请在重复评分之前，请您阅读完整的问题，因为它不可能。

我尝试了以下教程：

• Getting Location Updates for iOS 7 and 8 when the App is Killed/Terminated/Suspended
• Background Modes Tutorial: Getting Started
• to run app continously in the background
• Not exactly what I need, but still I tried

假设我没有捕获位置的实现。我需要每天中午，捕获用户的位置并保存数据库，然后发送到 Web 服务。 无论应用在后台是否处于活动状态（中间按钮上的两个环和拖动），都必须创建此捕获位置。

我尝试了一些在互联网上找到的教程，甚至一些社区建议的教程，但仍然没有奏效。

• 我添加了背景模式 - 位置。
• 我允许获取位置requestAlwaysAuthorization。

语言可以是objective-c或swift，最重要的是，我学会了如何在应用处于所有状态时捕获这个位置。

Answer 1

好的，我将尽可能简单地做到这一点。启用后台模式并勾选后台获取，如下所示

每一步都遵循这个方法

应用终止时

AppDelegate.h

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

 @interface AppDelegate : UIResponder  <UIApplicationDelegate,CLLocationManagerDelegate>

  @property (strong, nonatomic) UIWindow *window;
  @property (strong,nonatomic) CLLocationManager *locationManager;

  @end

AppDelegate.m

#define userDef [NSUserDefaults standardUserDefaults]
#define IS_OS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)


#import "AppDelegate.h"
#import <CoreLocation/CoreLocation.h>
#import "AFNetworking.h"
#import <GoogleMaps/GoogleMaps.h>


@implementation AppDelegate{
    BOOL fromTerminated;
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{
   fromTerminated = NO;
if ([launchOptions objectForKey:UIApplicationLaunchOptionsLocationKey]) {
    fromTerminated = YES;
    self.locationManager = [[CLLocationManager alloc]init];
    self.locationManager.delegate = self;
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
    self.locationManager.activityType = CLActivityTypeOtherNavigation;
    [self.locationManager startUpdatingLocation];
}

    return YES;
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
if(self.locationManager){
    [self.locationManager stopMonitoringSignificantLocationChanges];
    self.locationManager = nil;
    self.locationManager.delegate = nil;

}

self.locationManager = [[CLLocationManager alloc]init];
self.locationManager.delegate = self;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
self.locationManager.activityType = CLActivityTypeOtherNavigation;

if(IS_OS_8_OR_LATER) {
    [self.locationManager requestAlwaysAuthorization];
}
[self.locationManager startMonitoringSignificantLocationChanges];
}

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

NSLog(@"locationManager didUpdateLocations: %@",locations);


if(fromTerminated){

    CLLocation * newLocation = [locations lastObject];
    CLLocationCoordinate2D theLocation = newLocation.coordinate;
    CLLocationAccuracy theAccuracy = newLocation.horizontalAccuracy;

    [userDef setObject:[NSString stringWithFormat:@"%f",theLocation.longitude] forKey:@"LONGITUDE"];
    [userDef setObject:[NSString stringWithFormat:@"%f",theLocation.latitude] forKey:@"LATITUDE"];
    self.myLocation = theLocation;
    self.myLocationAccuracy = theAccuracy;
    [self updateLocation];
   }
}


-(void)updateLocation{
// call your webservice for updating
}

@end

此代码将执行以下操作--> 后台获取将触发位置更改并启动应用程序，didFInishLaunchingWithOptions 将在选项字典中使用 UIApplicationLaunchOptionsLocationKey 调用。如果它发现这意味着应用程序已终止并被唤醒以进行后台提取。现在你有 30 秒左右的时间来做你的事情。因此，您创建一个位置管理器对象并开始更新，这将触发您的 didUpdateLocations 委托方法，然后您可以调用您的方法来触发服务器或数据库中更改的位置。

在您的普通 VC 中创建另一个位置管理器对象，就像您在 didFinishiLaunchingWithOptions 方法中创建的一样，并实现委托方法 didUpdateLocation 这将一直运行，直到应用程序处于前台或后台。应用程序委托方法 hack 将在应用程序终止时触发。

干杯:)

[编辑]

当应用在前台或后台时

#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>

@interface ViewController ()<CLLocationManagerDelegate>
@property (nonatomic,strong) CLLocationManager *locationManager;

@end

@implementation ViewController{
}


 -(void)viewDidAppear:(BOOL)animated{
   if(self.locationManager == nil){
    _locationManager = [CLLocationManager new];
   }
    _locationManager.delegate = self;
    _locationManager.distanceFilter = kCLDistanceFilterNone;
    _locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;

    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0 &&     [CLLocationManager authorizationStatus] != kCLAuthorizationStatusAuthorizedWhenInUse) {
    [_locationManager requestAlwaysAuthorization];
    } else {
        [_locationManager startUpdatingLocation];
     }
  }


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

    _locationManager = nil;
    CLLocation *location = [locations lastObject];
    theUser.latitude = [NSString stringWithFormat:@"%f",location.coordinate.latitude];
    theUser.longitude = [NSString stringWithFormat:@"%f",location.coordinate.longitude];

   }
}


- (void)locationManager:(CLLocationManager*)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
  {
switch (status) {
    case kCLAuthorizationStatusNotDetermined: {
    } break;
    case kCLAuthorizationStatusDenied: {
    } break;
    case kCLAuthorizationStatusAuthorizedWhenInUse:
    case kCLAuthorizationStatusAuthorizedAlways: {
        [_locationManager startUpdatingLocation]; //Will update location immediately
    } break;
    default:
        break;
   }
}


@end

[编辑]

要检查应用程序是否在终止状态后启动，请执行此更改并点击运行按钮并从情节提要中更改设备的位置

执行此更改，然后运行项目（在设备的调试模式下执行此操作） 并通过此更改位置，然后在applicationDidFinishLaunchingWithOptions 中设置断点，您将看到断点被命中，这意味着应用程序处于终止状态，但此位置更改已触发操作系统启动应用程序。

希望能让你明白