功能“didUpdateToLocation”被召唤没有变化 [英] Function "didUpdateToLocation" being called without changes

问题描述

我用这种方式初始化locationManager：

I initialize the locationManager this way:

if (!self.locManager) 
{
    self.locManager = [[CLLocationManager alloc] init];
    self.locManager.delegate = self;
    [locManager startMonitoringSignificantLocationChanges];
}

我的设备没有移动，每次都会调用didUpdateToLocation。
有什么问题？
谢谢

my device is not moving and still "didUpdateToLocation" is being called every time. What could be a problem? Thanks

推荐答案

didUpdateToLocation 可能会更新一些原因是，处理这个问题的一个好策略是逐步根据时间戳过滤结果，然后按要求的准确度过滤。

didUpdateToLocation may update for a number of reasons, a good strategy for handling this is to gradually filter results based on timestamp, then required accuracy.

Apple在 LocateMe示例应用 ：

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
    // test the age of the location measurement to determine if the measurement is cached
    // in most cases you will not want to rely on cached measurements
    NSTimeInterval locationAge = -[newLocation.timestamp timeIntervalSinceNow];
    if (locationAge > 5.0) return;

    // test that the horizontal accuracy does not indicate an invalid measurement
    if (newLocation.horizontalAccuracy < 0) return;

    // test the measurement to see if it is more accurate than the previous measurement
    if (self.bestEffortAtLocation == nil || self.bestEffortAtLocation.horizontalAccuracy > newLocation.horizontalAccuracy)
    {
        // store the location as the "best effort"
        self.bestEffortAtLocation = newLocation;

        // test the measurement to see if it meets the desired accuracy
        //
        // IMPORTANT!!! kCLLocationAccuracyBest should not be used for comparison with location coordinate or altitidue 
        // accuracy because it is a negative value. Instead, compare against some predetermined "real" measure of 
        // acceptable accuracy, or depend on the timeout to stop updating. This sample depends on the timeout.
        //
        if (newLocation.horizontalAccuracy <= locationManager.desiredAccuracy) {
            // we have a measurement that meets our requirements, so we can stop updating the location
            // 
            // IMPORTANT!!! Minimize power usage by stopping the location manager as soon as possible.
            //
            [self stopUpdatingLocation:NSLocalizedString(@"Acquired Location", @"Acquired Location")];
        }
    }
}

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