iphone - locationManager didFailWithError 重复调用

Question

当位置管理器无法找到当前位置时，我正在显示 alertViews。我是这样做的

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {

[manager stopUpdatingLocation];

switch([error code])
{
    case kCLErrorNetwork: // general, network-related error
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Please check your network connection or that you are not in airplane mode" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    }
        break;
    case kCLErrorDenied:{
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"User has denied to use current Location " delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    }
        break;
    default:
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Unknown network error" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
        [alert show];
        [alert release];
    }
        break;
}

}

我的问题是locationManager didFailWithError 方法被重复调用。所以我的 alertviews 反复显示。

我该如何解决这个问题？

Answer 1

Apple 文档指出:

If the location service is unable to retrieve a location right away, it reports a kCLErrorLocationUnknown error and keeps trying. In such a situation, you can simply ignore the error and wait for a new event.

If the user denies your application’s use of the location service, this method reports a kCLErrorDenied error. Upon receiving such an error, you should stop the location service.

因此您可能会跳过某些停止更新并显示警报的情况，尤其是默认情况。