locationManager 定位地址不准，获取回调更准的方法

来源：互联网发布：算法工程师是程序员吗编辑：程序博客网时间：2024/05/17 04:38

原来的写法，这种写法获取第一次返回的结果，然后就会停止更新经纬度

- （void）operationLocations:(NSArray *)locations{    [self.locationManager stopUpdatingLocation];     ....     ....}- (void)locationManager:(CLLocationManager *)manager     didUpdateLocations:(NSArray *)locations   [self operationLocations:locations];}

猜想：LocationManager 定位回调会多次回调，及多次纠偏。所以，如果是最后一次，则是最准确的。

了解到：

// 延迟0.2s执行，如果有新任务，则取消原先的任务。最终只执行最后一次任务。

[[self class] cancelPreviousPerformRequestsWithTarget:self selector:@selector(todoSomething:) object:sender];

[self performSelector:@selector(todoSomething:) withObject:sender afterDelay:0.2f];

于是新写法如下：

- （void）operationLocations:(NSArray *)locations{    [self.locationManager stopUpdatingLocation];     ....     ....}- (void)locationManager:(CLLocationManager *)manager     didUpdateLocations:(NSArray *)locations{     [[self class] cancelPreviousPerformRequestsWithTarget:self selector:@selector(operationLocations:) object:locations];    [self performSelector:@selector(operationLocations:) withObject:locations afterDelay:0.2f];}

0 0