IOS8上定位问题

在ios7之前，我们进入程序提示用户开启定位是这样做的，如下：

        CLLocationManager * locationManager = [[CLLocationManager alloc] init];//创建位置管理器

        //locationManager.delegate=_instance;

        locationManager.desiredAccuracy=kCLLocationAccuracyBest;

        locationManager.distanceFilter=100.0f;

        //定位服务是否可用

        BOOL enable=[CLLocationManager locationServicesEnabled];

        //是否具有定位权限

        int status=[CLLocationManager authorizationStatus];

        if(!enable || status<3){

            //请求权限

            [locationManager requestWhenInUseAuthorization];

        }

但是到了ios8后，发现定位压根就不起作用，老是提示：

ios8定位解决如下：

先在info.plist定义key：（总是授权）NSLocationAlwaysUsageDescription或者使用时授权NSLocationWhenInUseUsageDescription

在.h里面

  继承代码CLLocationManagerDelegate

   定义CLLocationManager *_locationManager;

在.m里面定义：

- (void)startTrackingLocation {

    CLAuthorizationStatus status = [CLLocationManager authorizationStatus];

    if (status == kCLAuthorizationStatusNotDetermined) {

        //总是授权

        [_locationManager requestAlwaysAuthorization];

        //每次授权一次

        //[_locationManager requestWhenInUseAuthorization];

    }

    else if (status == kCLAuthorizationStatusAuthorizedWhenInUse || status == kCLAuthorizationStatusAuthorizedAlways) {

        [_locationManager startUpdatingLocation];

    }

}

//实现代码回调

#pragma mark - CLLocationManager Delegate Methods

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

    switch (status) {

        case kCLAuthorizationStatusAuthorizedAlways:

        case kCLAuthorizationStatusAuthorizedWhenInUse:

            NSLog(@"Got authorization, start tracking location");

            [self startTrackingLocation];

            break;

        case kCLAuthorizationStatusNotDetermined:

            [_locationManager requestAlwaysAuthorization];

            break;

        default:

            break;

    }

}

调用如下：   

    if (IOS8) {

        _locationManager = [[CLLocationManager alloc] init];

        _locationManager.delegate = self;

        [self startTrackingLocation];

    }

最后实现效果如下图，点击Allow即可定位了：