我正在尝试调整我的CLLocationManager设置，以便在调用startUpdatingLocation时立即调用委托。关于如何做到这一点的任何想法？
答案 0 :(得分：2)
多数民众赞成不可能。原因很简单，设备没有能够在整个时间内满足您所需精度的定位。它可能必须打开GPS芯片来执行此操作，这也需要一些时间来定位（没有额外的信息和过时的历书，在最坏的情况下这可能需要长达15分钟）。
答案 1 :(得分：0)
以这种方式调整CLLocationManger是不可能的。但是，你可以做的是在CLLocationManager周围编写一个包装器，它在启动时获取当前位置，并在每次请求时返回它。但是，可能存在位置尚未（现在）可用的情况，并且这种方法非常耗电，因为您始终使用GPS设备。
答案 2 :(得分：0)
到目前为止，这不是最佳方式（可能不是很好的方式）使用CLLocationManager，当我找到时间计划返回并更改我的代码时在我的AppDelegate中只有一个CLLocationManager并让所有子视图控制器调用AppDelegate以满足其位置需求。
我在视图控制器中有以下代码（不是主控制器或app委托），在我的主视图导航控制器推动视图控制器后约5-10秒，它开始写入{{1}我的位置有一个准确的long / lat（即委托方法NSLog开始被调用）：
locationManager:didUpdateToLocation:fromLocation:然后，在- (void)viewDidLoad {
[super viewDidLoad];
// ....
self.locationManager = [[[CLLocationManager alloc] init] autorelease];
[locationManager setDelegate:self];
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
[locationManager setDistanceFilter:kCLDistanceFilterNone];
[locationManager startUpdatingLocation];
// ....
}
// This will be called just a few seconds after the view appears and the
// location is accurate (if I have location services on and good sky-line of sight)
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
NSDate* eventDate = newLocation.timestamp;
NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
if (abs(howRecent) < 5.0) {
self.latitude = [NSNumber numberWithDouble:newLocation.coordinate.latitude];
self.longitude = [NSNumber numberWithDouble:newLocation.coordinate.longitude];
NSLog(@"New Latitude %+.6f, Longitude %+.6f", newLocation.coordinate.latitude, newLocation.coordinate.longitude);
}
}
// Then, tear down the location Manager (so I can use it in another view controller)
// A bit excessive possibly, but I like to be absolutely sure that my App does not use the GPS
// when it doesn't need it to save batter life.
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[locationManager stopMonitoringSignificantLocationChanges];
[locationManager stopUpdatingHeading];
[locationManager stopUpdatingLocation];
}
- (void)viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
[locationManager stopMonitoringSignificantLocationChanges];
[locationManager stopUpdatingHeading];
[locationManager stopUpdatingLocation];
}
- (void)viewDidUnload {
[locationManager stopUpdatingLocation];
[locationManager stopMonitoringSignificantLocationChanges];
[locationManager stopUpdatingHeading];
[locationManager setDelegate:nil];
self.locationManager = nil;
}
- (void)dealloc {
// ....
[locationManager stopUpdatingLocation];
[locationManager setDelegate:nil];
[locationManager release], locationManager = nil;
// ....
[super dealloc];
}
这样的地方，我可以使用actionSheet:clickedButtonAtIndex: / locationManager.location.coordinate.latitude或locationManager.location.coordinate.longitude / {{1获取位置值 on0demand }}