iphone - 位置管理器 :didUpdateLocations: always be called several times

Question

我在 View 确实出现时开始更新当前位置，并在调用 locationManager:didUpdateLocations: 时停止更新位置。但为什么 locationManager:didUpdateLocations: 总是被调用多次？我错过了什么？

#import "ViewController.h"

@interface ViewController (){
    CLLocationManager *locationManager; // location manager for current location
}
@end

@implementation ViewController
- (void)viewDidLoad
{
    [super viewDidLoad];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    [self startUpdatingCurrentLocation];
}

- (void)startUpdatingCurrentLocation
{
    if (!locationManager)
    {
        locationManager = [[CLLocationManager alloc] init];
        [locationManager setDelegate:self];
        locationManager.distanceFilter = 10.0f; // we don't need to be any more accurate than 10m
    }
    [locationManager startUpdatingLocation];
}

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
    [locationManager stopUpdatingLocation];
}
@end

Answer 1

可能这取决于您为 locationManager 设置的准确性。你有 3 种 o 本地化手机 radio 、WiFi map 、GPS。如果您将精度设置为最佳，位置管理器将继续检查您的位置，如果精度更高的位置超出距离过滤器的范围，将再次调用委托(delegate)方法。