IOS8上定位問題

在ios7之前，我們進入程序提示用戶開啟定位是這樣做的，如下：

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

        //locationManager.delegate=_instance;

        locationManager.desiredAccuracy=kCLLocationAccuracyBest;

        locationManager.distanceFilter=100.0f;

        //定位服務是否可用

        BOOL enable=[CLLocationManager locationServicesEnabled];

        //是否具有定位權限

        int status=[CLLocationManager authorizationStatus];

        if(!enable || status<3){

            //請求權限

            [locationManager requestWhenInUseAuthorization];

        }

但是到了ios8后，發現定位壓根就不起作用，老是提示：

ios8定位解決如下：

先在info.plist定義key：（總是授權）NSLocationAlwaysUsageDescription或者使用時授權NSLocationWhenInUseUsageDescription

在.h里面

  繼承代碼CLLocationManagerDelegate

   定義CLLocationManager *_locationManager;

在.m里面定義：

- (void)startTrackingLocation {

    CLAuthorizationStatus status = [CLLocationManager authorizationStatus];

    if (status == kCLAuthorizationStatusNotDetermined) {

        //總是授權

        [_locationManager requestAlwaysAuthorization];

        //每次授權一次

        //[_locationManager requestWhenInUseAuthorization];

    }

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

        [_locationManager startUpdatingLocation];

    }

}

//實現代碼回調

#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;

    }

}

調用如下：   

    if (IOS8) {

        _locationManager = [[CLLocationManager alloc] init];

        _locationManager.delegate = self;

        [self startTrackingLocation];

    }

最后實現效果如下圖，點擊Allow即可定位了：