为什么iOS8中的CLLocationManager startUpdatingLocation没有？

概述我使用XCode 6附带的模拟器测试iOS 8.0中的现有位置功能.我无法获得 CLLocationManager.startUpdatingLocation触发 CLLocationManagerDelegate.locationManager:didUpdateLocations或 CLLocationManagerDelegate.locationManager:didFailWithErr 我使用XCode 6附带的模拟器测试iOS 8.0中的现有位置功能.我无法获得 CLLocationManager.startUpdatingLocation触发 CLLocationManagerDelegate.locationManager:didUpdateLocations或
CLLocationManagerDelegate.locationManager:didFailWithError.

我没有得到“”我的应用程序“想要使用您的当前位置”警报,就像我在iOS 7.0.3模拟器上做的那样.我已使用Google地图应用验证模拟的位置设置.

这在iOS 7.0.3模拟器中工作正常.

我哪里错了？

解决方法 iOS 8要求在调用CLLocationManager.startUpdatingLocation之前调用 CLLocationManager.requestWhenInUseAuthorization或 CLLocationManager.requestAlwaysAuthorization.

@interface MyVIEwController : UIVIEwController <CLLocationManagerDelegate>@property CLLocationManager *locationManager;@end

requestWhenInUseAuthorization和requestAlwaysAuthorization异步运行,因此您希望确保在使用之前不清除您的CLLocationManager对象,以响应警报.

- (voID) vIEwDIDAppear:(BOol)animated {    if ([CLLocationManager locationServicesEnabled]) {        self.locationManager = [CLLocationManager new];        self.locationManager.delegate = self;        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;        SEL selector = NSSelectorFromString(@"requestWhenInUseAuthorization");        if ([self.locationManager respondsToSelector:selector]) {            [self.locationManager requestWhenInUseAuthorization];        } else {            [self.locationManager startUpdatingLocation];        }    } else {        ...    }}- (voID)locationManager:(CLLocationManager *)manager dIDChangeAuthorizationStatus:(CLAuthorizationStatus)status {    if (status == kCLAuthorizationStatusAuthorizeDWhenInUse) {        [self.locationManager startUpdatingLocation];    } else if (status == kCLAuthorizationStatusAuthorized) {        // iOS 7 will redundantly call this line.        [self.locationManager startUpdatingLocation];    } else if (status > kCLAuthorizationStatusNotDetermined) {        ...    }}- (voID)locationManager:(CLLocationManager *)manager dIDUpdateLocations:(NSArray *)locations {    ...}- (voID)locationManager:(CLLocationManager *)manager dIDFailWithError:(NSError *)error {    ...}

实现CLLocationManagerDelegate时,您现在也需要实现locationManager:didChangeAuthorizationStatus:方法.在此方法中,您可以检查用户是否已授予应用程序权限,并采取相应措施.

如果[CLLocationManager authorizationStatus] = nil,则当authorizationStatus设置为kCLAuthorizationStatusNotDetermined时,将调用locationManager：dIDChangeAuthorizationStatus：当用户从警告对话框中进行选择时,将再次调用.

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