我已经知道如何使用CLLocationManager，所以我可以用代表和所有这些来完成它。
I already know how to use the CLLocationManager, so I could do it the hard way, with delegates and all that.
但是我希望有一个方便的方法，只需获取当前位置一次，然后阻塞直到得到结果。
But I'd like to have a convenience method that just gets the current location, once, and blocks until it gets the result.
推荐答案我所做的是实现一个单例类来管理来自核心位置的更新。要访问我当前的位置，我执行 CLLocation * myLocation = [[LocationManager sharedInstance] currentLocation]; 如果要阻止主线程，可以执行以下操作：
What I do is implement a singleton class to manage updates from core location. To access my current location, I do a CLLocation *myLocation = [[LocationManager sharedInstance] currentLocation]; If you wanted to block the main thread you could do something like this:
while ([[LocationManager sharedInstance] locationKnown] == NO){ //blocking here //do stuff here, dont forget to have some kind of timeout to get out of this blocked //state }然而，正如已经指出的那样，阻止主线程可能不是一个好主意，但是当你正在构建一些东西时，这可能是一个很好的跳跃点。您还会注意到我编写的类检查位置更新的时间戳并忽略任何旧的，以防止从核心位置获取过时数据的问题。
However, as it has been already pointed out, blocking the main thread is probably not a good idea, but this can be a good jumping off point as you are building something. You will also notice that the class I wrote checks the timestamp on location updates and ignores any that are old, to prevent the problem of getting stale data from core location.
这是我写的单身课程。请注意，边缘有点粗糙：
This is the singleton class I wrote. Please note that it is a little rough around the edges:
#import <CoreLocation/CoreLocation.h> #import <Foundation/Foundation.h> @interface LocationController : NSObject <CLLocationManagerDelegate> { CLLocationManager *locationManager; CLLocation *currentLocation; } + (LocationController *)sharedInstance; -(void) start; -(void) stop; -(BOOL) locationKnown; @property (nonatomic, retain) CLLocation *currentLocation; @end @implementation LocationController @synthesize currentLocation; static LocationController *sharedInstance; + (LocationController *)sharedInstance { @synchronized(self) { if (!sharedInstance) sharedInstance=[[LocationController alloc] init]; } return sharedInstance; } +(id)alloc { @synchronized(self) { NSAssert(sharedInstance == nil, @"Attempted to allocate a second instance of a singleton LocationController."); sharedInstance = [super alloc]; } return sharedInstance; } -(id) init { if (self = [super init]) { self.currentLocation = [[CLLocation alloc] init]; locationManager = [[CLLocationManager alloc] init]; locationManager.delegate = self; [self start]; } return self; } -(void) start { [locationManager startUpdatingLocation]; } -(void) stop { [locationManager stopUpdatingLocation]; } -(BOOL) locationKnown { if (round(currentLocation.speed) == -1) return NO; else return YES; } - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { //if the time interval returned from core location is more than two minutes we ignore it because it might be from an old session if ( abs([newLocation.timestamp timeIntervalSinceDate: [NSDate date]]) < 120) { self.currentLocation = newLocation; } } - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error { UIAlertView *alert; alert = [[UIAlertView alloc] initWithTitle:@"Error" message:[error description] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release]; } -(void) dealloc { [locationManager release]; [currentLocation release]; [super dealloc]; } @end更多推荐
获取iPhone当前位置的最简单方法是什么？
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