Question

下面是我的CLLocationManagerDelegate的代码。我使用：

调用委托方法

locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;

[locationManager startUpdatingLocation];

委托方法：

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
    NSLog(@"didFailWithError: %@", error);
    UIAlertView *errorAlert = [[UIAlertView alloc]
                           initWithTitle:@"Error" message:@"Failed to Get Your Location" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [errorAlert show];
}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
    //get current location of phone:
    if (newLocation != nil) {
        _m.longitude = [NSString stringWithFormat:@"%.8f", newLocation.coordinate.longitude];
        _m.latitude = [NSString stringWithFormat:@"%.8f", newLocation.coordinate.latitude];
        _m.timestamp = newLocation.timestamp;
        NSLog(@"didUpdateToLocation: %@", newLocation);
    }
    CLLocation *currentLocation = newLocation;

}

当我调用didUpdateToLocation方法时，我已经通过调试验证了newLocation不是nil。 _m是在我的标题中声明的对象，也不是nil。对于locationManager也是如此。但是，当我尝试设置_m.latitude等和NSLog时，它们都显示为（null）。 didUpdateToLocation NSLog产生如下行：

didUpdateToLocation：＆lt; + 47.64312748，-122.12163262＆gt; +/- 65.00米（速度-1.00 mps /航向-1.00）@ 7/15 / 14,19：26：07太平洋夏令时

我不确定我哪里出错了。

Answer 1

您的代码看起来是正确的。所以你可能在日志中得到null，因为_m == nil。

CLLocation返回（null）坐标

1 个答案: