当用户每移动 50/100 米时通知 iOS

Question

嗨，我想在位置变化 50 米（不少于此）时调用网络服务。我尝试过使用重大更改，但它至少适用于 500 米，并且 startupdatelocations 会一直调用。那么我如何检测设备是否从该位置移动了 50 或 100 米。

我在许多 Whosebug 问题中都使用了 50 米的距离过滤器。但是在移动到 50 米之前它不起作用我在设备中获得了位置更新。

这里有人解释了距离过滤器 - iphone core location: distance filter how does it work?

Answer 1

非常简单。

首先在你的ViewDidload方法中写入Alloc CLLocationManager。

这里我设置了50M的距离。

locationManager = [[CLLocationManager alloc] init];

    //there will be a warning from this line of code
    [locationManager setDelegate:self];

    //and we want it to be as accurate as possible
    //regardless of how much time/power it takes
    [locationManager setDesiredAccuracy:kCLLocationAccuracyBest];

    //set the amount of metres travelled before location update is made
    [locationManager setDistanceFilter:50];
    [locationManager requestAlwaysAuthorization];
    [locationManager requestWhenInUseAuthorization];
    [locationManager startUpdatingLocation];

因此每 50 米更换设备此方法称为：

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
    if (locations.count > 0) {
        CLLocation *location = locations.lastObject;
        User_latitude = [NSString stringWithFormat:@"%f",location.coordinate.latitude];
        User_longitude = [NSString stringWithFormat:@"%f",location.coordinate.longitude];
        NSLog(@"latitude = %f",location.coordinate.latitude);
        NSLog(@"longitude = %f",location.coordinate.longitude);
        [self webservice_UpdateLocation];
    }
}

当用户每移动 50/100 米时通知 iOS

Notify when the user moved every 50/100 meters iOS

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