iOS didEnterRegion 从未调用过

Question

我在iOS和gefencing方面遇到了一些问题......

//
//  ViewController.m
//  
//
//  Created by me on 14.05.13.
//  Copyright (c) 2013 me. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()<CLLocationManagerDelegate>

{
    CLLocationManager *locationManager;
    CLRegion *testRegion;
}
#define METERS_PER_MILE 1609.344
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self initlocationManager];
//    [self startlocationManager];
}

// init location Manager Object, set delegation, result and accurate
- (void)initlocationManager {
    //create location manager object
    locationManager = [[CLLocationManager alloc]init];

    //this instance send its messages to our AppDelegate
    [locationManager setDelegate:self];

    //to get all results from the location manager
    [locationManager setDistanceFilter:kCLDistanceFilterNone];

    //be accurate as possible
    [locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
}

- (void)viewWillAppear:(BOOL)animated {

    CLLocationCoordinate2D startLocation;
    startLocation.latitude = +52.53753000;
    startLocation.longitude= +13.35971000;

    MKPointAnnotation *newLocation = [[MKPointAnnotation alloc] init];
    newLocation.coordinate = startLocation;
    newLocation.title = @"great title";
    newLocation.subtitle = @"great subtitle";
    MKCoordinateRegion startingRegion = MKCoordinateRegionMakeWithDistance(startLocation,                                                                              0.5*METERS_PER_MILE, 0.5*METERS_PER_MILE);
    testRegion = [[CLRegion alloc] initCircularRegionWithCenter:startLocation radius:500 identifier:@"TEST"];
    [_mapView addAnnotation:newLocation];
    [_mapView setRegion:startingRegion animated:YES];
    [locationManager startMonitoringForRegion:testRegion];
    NSLog(@"%@",locationManager.monitoredRegions);
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    NSLog(@"Error : %@",error);
}

- (void)locationManager:(CLLocationManager *)manager monitoringDidFailForRegion:(CLRegion *)region withError:(NSError *)error
{
    NSLog(@"Region monitoring failed with error: %@", [error localizedDescription]);
}

- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region {
     NSLog(@"Entered Region - %@", region.identifier);
//    [self showRegionAlert:@"Entering Region" forRegion:testRegion.identifier];
}

- (void)locationManager:(CLLocationManager *)manager didStartMonitoringForRegion:(CLRegion *)region {
    NSLog(@"Started monitoring %@ region", region.identifier);
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
@end

终端给我以下消息:

2013-05-15 00:24:47.739 [8712:13d03] {(
    (identifier TEST) <+52.53753000,+13.35972000> radius 500.00m
)}
2013-05-15 00:24:47.972 [8712:13d03] Started monitoring TEST region

这样区域就创建成功了，监控也开始了
但是 didEnterRegion从未调用过的函数。

帮助会很棒!

编辑:

目前我在 iphone 模拟器中使用该 gpx 文件，它工作正常。仅限 didEnterRegion永远不会被调用。

<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<gpx version="1.1" creator="http://www.geoplaner.com" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.topografix.com/GPX/1/1"  xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd">
    <wpt lat="52.53856" lon="13.3515">
        <ele>36.6</ele>
        <name>WP04-D</name>
    </wpt>
    <wpt lat="52.53753" lon="13.35972">
        <ele>35.1</ele>
        <name>WP05-E</name>
    </wpt>
    <wpt lat="52.538" lon="13.35788">
        <ele>34.1</ele>
        <name>WP06-F</name>
    </wpt>
    <wpt lat="52.53844" lon="13.35633">
        <ele>33.6</ele>
        <name>WP07-G</name>
    </wpt>
    <wpt lat="52.53895" lon="13.35392">
        <ele>34.7</ele>
        <name>WP08-H</name>
    </wpt>
    <wpt lat="52.53813" lon="13.34925">
        <ele>36</ele>
        <name>WP09-I</name>
    </wpt>
    <wpt lat="52.53794" lon="13.34667">
        <ele>36.3</ele>
        <name>WP10-J</name>
    </wpt>
    <wpt lat="52.53815" lon="13.34504">
        <ele>37.1</ele>
        <name>WP11-K</name>
    </wpt>
    <wpt lat="52.5369" lon="13.35938">
        <ele>39.3</ele>
        <name>WP12-L</name>
    </wpt>
    <wpt lat="52.53619" lon="13.35792">
        <ele>33.3</ele>
        <name>WP13-M</name>
    </wpt>
    <wpt lat="52.53468" lon="13.35508">
        <ele>37.3</ele>
        <name>WP14-N</name>
    </wpt>
    <wpt lat="52.53398" lon="13.35367">
        <ele>37</ele>
        <name>WP15-O</name>
    </wpt>
    <wpt lat="52.53781" lon="13.35862">
        <ele>33.7</ele>
        <name>WP16-P</name>
    </wpt>

</gpx>

Answer 1

你的代码看起来不错。只需确保 locationManager 被保留/强烈持有。

使用 iPhone 模拟器测试您的区域代码。在“调试”菜单上，从“位置”子菜单中选择一个位置。更改不同的位置将锻炼您的代码。

我刚刚使用 iPhone 模拟器并通过从子菜单中选择位置来测试您的代码。我为“自定义位置”输入了您代码的纬度/经度数字。这是输出:

2013-05-15 07:42:50.885 Location[69277:c07] {(
    (identifier home) <+37.26917400,-119.30660700> radius 100.00m
)}
2013-05-15 07:42:50.932 Location[69277:c07] Started monitoring TEST region
2013-05-15 07:44:01.103 Location[69277:c07] Entered Region - TEST
2013-05-15 07:44:59.573 Location[69277:c07] Entered Region - TEST

当我选择“自定义位置”时出现“输入区域”输出。我对您的代码所做的唯一更改是:1)注释掉“mapView”行，2)声明 ViewController 接口(interface)，如下所示。您使用了类扩展。

@interface ViewController : UIViewController
  <CLLocationManagerDelegate> 
{
  CLLocationManager *locationManager;
  CLRegion *testRegion;
}
@end

确保为您的应用启用位置服务。