ios - CLLocation didupdatetolocation 未调用

Question

花了几天时间试图解决这个问题，但找不到任何有效的解决方案。我检查了 stackoverflow 上的所有帖子并尝试了他们所有的解决方案，但似乎没有任何效果。我还尝试了 CLLocation 的苹果测试项目，它对我来说效果很好。我使用了苹果测试项目中的点点滴滴

https://developer.apple.com/library/ios/samplecode/LocateMe/Listings/README_md.html

但是我的代码根本不起作用。 DidupdateToLocation 永远不会被调用。

这是我的代码(在 viewDidLoad 中)

_locationManager = [[CLLocationManager alloc] init];

self.locationManager.delegate = self;



// This is the most important property to set for the manager. It ultimately determines how the manager will

// attempt to acquire location and thus, the amount of power that will be consumed.

self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;



// Once configured, the location manager must be "started"

//

// for iOS 8, specific user level permission is required,

// "when-in-use" authorization grants access to the user's location

//

// important: be sure to include NSLocationWhenInUseUsageDescription along with its

// explanation string in your Info.plist or startUpdatingLocation will not work.

//

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

    [self.locationManager requestWhenInUseAuthorization];

}

[self.locationManager startUpdatingLocation];



[self performSelector:@selector(stopUpdatingLocationWithMessage:)

           withObject:@"Timed Out"

           afterDelay:30];

我已检查以确保 locationServicesEnabled 已启用。

我已将 NSLoationWhenInUseUsageDescription 属性添加到 info.plist 文件中。我是否需要添加任何其他属性或启用任何服务？？

看在上帝的份上，我无法弄清楚我做错了什么。有人可以帮我解决这个问题吗？

Answer 1

在 iOS8 上收到 didChangeAuthorization Status 回调后，您必须调用 startUpdatingLocation。

//iOS 8 API change
if([self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]){
    [self.locationManager requestWhenInUseAuthorization];
}else{
    [self.locationManager startUpdatingLocation];
}

实现这个委托(delegate)方法:

-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
    switch (status) {
        case kCLAuthorizationStatusNotDetermined:
        case kCLAuthorizationStatusRestricted:
        case kCLAuthorizationStatusDenied:
        {
            // do some error handling
        }
            break;
        default:{
            [self.locationManager startUpdatingLocation];
        }
            break;
    }
}