检查用户是否允许该应用使用其位置

Question

当应用程序第一次尝试获取用户位置时,系统会提示"想要使用您当前的位置",他们可以点击"不允许"或"确定".有没有办法找出用户是否已经确定或不允许？我正在尝试让MKMapView显示用户当前位置,但我想根据用户选择采取不同的操作.

通常你会认为有一个代表来获取这些信息,但似乎没有.

在此先感谢您的帮助.

Answer 1

您第一次获取用户位置的调用将失败,并显示一条错误消息,告知您用户已拒绝了位置服务.您的CLLocationManagerDelegate方法didFailWithError将被调用,如下所示.(常量定义在CLError.h)

- (void)locationManager:(CLLocationManager*)aManager didFailWithError:(NSError*)anError
{
    switch([anError code])
    {
    case kCLErrorLocationUnknown: // location is currently unknown, but CL will keep trying
    break;

    case kCLErrorDenied: // CL access has been denied (eg, user declined location use)
    message = @"Sorry, flook has to know your location in order to work. You'll be able to see some cards but not find them nearby";
    break;

    case kCLErrorNetwork: // general, network-related error
    message = @"Flook can't find you - please check your network connection or that you are not in airplane mode";
    }
}