CLLocationManager 没有收到更新

Posted 2023-02-23

【中文标题】CLLocationManager 没有收到更新

【英文标题】：CLLocationManager don't receive updates

【发布时间】：2013-09-20 20:09:08

【问题描述】：

我是 Objective-C 世界的新手。我尝试在模拟器上的 ios 6.1 上开发简单的定位应用程序。但是当我尝试模拟位置时，它根本不起作用。我没有收到任何事件，但delegate 对象已正确注册并且PositionProvider 是startUpdate。

怎么了？

我有以下代码：

位置提供者

#import <Foundation/Foundation.h>
#import <CoreLocation/CoreLocation.h>
#import "LocationListener.h"

@interface PositionProvider : NSObject

    @public
    LocationListener<CLLocationManagerDelegate> *listener;
    @protected
    CLLocationManager *manager;


#pragma mark -
#pragma mark on/off

-(void) startUpdate;

-(void) stopUpdate;

@end

实施

    @implementation PositionProvider

@private
    CLLocation *lastLocation;


-(void) startUpdate
    manager = [[CLLocationManager alloc] init];

    LocationListener *listener2 = [[LocationListener alloc]init];

    manager.delegate = listener2;
    manager.desiredAccuracy = kCLLocationAccuracyBest;

    if(manager == nil)
        NSLog(@"Manager is NULL");

    if(listener == nil || manager.delegate == nil)
        NSLog(@"Listener is NULL");

    NSLog(@"startUpdate");

    if ([CLLocationManager locationServicesEnabled]) 
        NSLog(@"Location Services Enabled");
        switch ([CLLocationManager authorizationStatus]) 
            case kCLAuthorizationStatusAuthorized:
                NSLog(@"We have access to location services");
                break;
            case kCLAuthorizationStatusDenied:
                NSLog(@"Location services denied by user");
                break;
            case kCLAuthorizationStatusRestricted:
                NSLog(@"Parental controls restrict location services");
                break;
            case kCLAuthorizationStatusNotDetermined:
                NSLog(@"Unable to determine, possibly not available");
                break;
            default:
                break;
        
    
    else 
        NSLog(@"Location Services Are Disabled");
    

    [manager startUpdatingHeading];
    [manager startUpdatingLocation];



-(void) stopUpdate





@end

位置监听器

@interface LocationListener : NSObject<CLLocationManagerDelegate>

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

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



    - (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status;

@end

实施

@implementation LocationListener 

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

//    newLocation.coordinate;

    NSLog(@"Logging Location");


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

    NSLog(@"Logging Location");


- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus) status


    NSLog(@"Status");


@end

【问题讨论】：

为什么他是一个名为 listener2 的变量和另一个 (ivar) 名为 listener 的变量？

@tdelepine 仅出于调试目的而更改。但是还是不行。

您是否使用wifi网络有时用户位置错误？在这种情况下，有必要进入模拟器菜单并设置更多次位置

@tdelepin 位置没有错，根本没有更新。我尝试多次更改位置，更改 GPS“路线”。它根本不起作用。

【参考方案1】：

你试过了吗

[manager setDelegate:listener2];

或者，您可能遇到内存管理问题。尝试使用 debugger-breakpoint 添加 dealloc 方法，看看它是否在您预期之前被调用：

- (void)dealloc 
    NSLog(@"Dealloc called");

    self.locationManager = nil;