Xcode 6 为啥 CLLocationManager 没有返回纬度和经度

Posted 2023-03-05

【中文标题】Xcode 6 为啥 CLLocationManager 没有返回纬度和经度

【英文标题】：Xcode 6 why CLLocationManager didn't return latitude and longitudeXcode 6 为什么 CLLocationManager 没有返回纬度和经度

【发布时间】：2015-03-14 09:41:50

【问题描述】：

为什么我能得到方向，却不能得到经纬度？ 我需要获取用户的位置信息准入并写入我的代码吗？

这是我的代码

#import "ViewController.h"

@interface ViewController ()<CLLocationManagerDelegate>

@end

@implementation ViewController

- (void)viewDidLoad 
    [super viewDidLoad];
    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;
    [self.locationManager startMonitoringSignificantLocationChanges];

    [self.locationManager startUpdatingLocation];
    [self.locationManager startUpdatingHeading];

// Do any additional setup after loading the view, typically from a nib.

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 
    [self.locationManager stopUpdatingLocation];
    self.Lat.text = [NSString stringWithFormat:@"%f", manager.location.coordinate.latitude];
    NSLog(@"%f",manager.location.coordinate.longitude);
    self.Long.text = [NSString stringWithFormat:@"%f", manager.location.coordinate.longitude];


-(void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading 
    self.Mag_heading.text = [NSString stringWithFormat:@"%f",newHeading.magneticHeading];
    self.True_heading.text = [NSString stringWithFormat:@"%f", newHeading.trueHeading];


- (void)didReceiveMemoryWarning 
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.

【问题讨论】：

@DipenChudasama 如何接受

只需按“右”刻度标记..它以灰色显示在答案下方。

【参考方案1】：

配置后，位置管理器必须“启动” 对于 ios 8，需要特定的用户级别权限， “使用时”授权授予对用户位置的访问权限 重要：一定要包括 NSLocationWhenInUseUsageDescription 及其 Info.plist 或 startUpdatingLocation 中的解释字符串将不起作用。

if ([self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) 

    [self.locationManager requestWhenInUseAuthorization];

【参考方案2】：

你必须替换下面的代码。

使用newLocation 而不是manager

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

    self.Lat.text = [NSString stringWithFormat:@"%f", newLocation.coordinate.latitude];
    NSLog(@"%f",newLocation.coordinate.latitude);
    self.Long.text = [NSString stringWithFormat:@"%f", newLocation.coordinate.longitude];
    [self.locationManager stopUpdatingLocation];