Objective C，iOS 7 - CLLocationManager：didUpdateLocations只被调用一次 [英] Objective C, iOS 7 - CLLocationManager: didUpdateLocations is being called only once
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问题描述
嗨！我正在编写一个导航器应用程序，并且我需要在任何可能的时候更新用户位置。我有两个使用CLLocation manager的View Controller。在他们两人中，我都添加了这一行：
#import< CoreLocation / CoreLocation.h>
然后添加到接口声明中，并将其设置为。 h文件，然后合成：
@property（strong，nonatomic）CLLocationManager * locationManager;
之后，我将以这种方式在viewDidLoad中启动de locationManager：
if（self）{
locationManager = [[CLLocationManager alloc] init];
//locationManager.delegate = self;
[locationManager setDelegate：self];
[locationManager setDistanceFilter：kCLHeadingFilterNone];
[locationManager setDesiredAccuracy：kCLLocationAccuracyBestForNavigation];
[locationManager startUpdatingLocation];
}
以下是我的委托方法。
第一次查看：
#pragma mark - CLLocationManagerDelegate
- （void）locationManager：（CLLocationManager *）manager didFailWithError：（NSError *）error
{
NSLog（@didFailWithError：％@，error）;
UIAlertView * errorAlert = [[UIAlertView alloc]
initWithTitle：@错误消息：@无法获得您的位置委托：无cancelButtonTitle：@OKotherButtonTitles：nil];
[errorAlert show]; （CLLocationManager *）经理didUpdateToLocation：（CLLocation *）newLocation fromLocation：（CLLocation *）oldLocation
{
NSLog（@B
$ b - didUpdateToLocation：％@，newLocation）;
CLLocation * currentLocation = newLocation;
if（currentLocation！= nil）{
homeLatitude = [[NSString stringWithFormat：@％。8f，currentLocation.coordinate.latitude] doubleValue];
homeLongitude = [[NSString stringWithFormat：@％。8f，currentLocation.coordinate.longitude] doubleValue];
NSLog（@Updated！ - > hl =％f，hlg =％f，homeLatitude，homeLongitude）;
}
}
第二个视图。正如你所看到的，我用didUpdateLocations取代了旧的didUpdateToLocation，作为一个绝望的尝试。
#pragma mark - CLLocationManagerDelegate
- （void）locationManager：（CLLocationManager *）manager didFailWithError：（NSError *）error
{
NSLog（@didFailWithError：％@，error）;
UIAlertView * errorAlert = [[UIAlertView alloc]
initWithTitle：@错误消息：@无法获得您的位置委托：无cancelButtonTitle：@OKotherButtonTitles：nil];
[errorAlert show]; （CLLocationManager *）manager didUpdateToLocation：（CLLocation *）newLocation fromLocation：（CLLocation *）oldLocation
{
NSLog（$）
/ * - （void）locationManager： （@didUpdateToLocation：％@，newLocation）;
CLLocation * currentLocation = newLocation;
if（currentLocation！= nil）{
NSLog（@Tarzan boy）;
_testLabel.text = [NSString stringWithFormat：@Oh DAMN !!!!]; $（void）locationManager：（CLLocationManager *）manager didUpdateLocations：（NSArray *）locations {
NSLog（@didUpdateToLocation：％ @，[位置lastObject]）;
CLLocation * currentLocation = [locations lastObject];
if（currentLocation！= nil）{
currentLatitude = [[NSString stringWithFormat：@％。8f，currentLocation.coordinate.latitude] doubleValue];
currentLongitude = [[NSString stringWithFormat：@％。8f，currentLocation.coordinate.longitude] doubleValue];
NSLog（@Updated！（MapWithRoutesViewController） - > hl =％f，hlg =％f，currentLatitude，currentLongitude）;
_testLabel.text = [NSString stringWithFormat：@Update！ - > hl =％f，hlg =％f，currentLatitude，currentLongitude];
//Aquíes donde borramos el lugar al que llegaron。
if（mapView）{
if（followMe）{
CLLocationCoordinate2D * c =&（（CLLocationCoordinate2D）{。latitude = currentLatitude，.longitude = currentLongitude}）;
[mapView.mapView as_setCenterCoordinate：* c zoomLevel：32 animated：NO];
_ourStepper.value = [mapView.mapView as_zoomLevel];如果（[mapView getNearestDestinyDistance：currentLocation]< 150.0）{
NSLog（@Hay que eliminar el primer destino del MapView）;
}
if
mapView.destinoActual ++; （[mapView getNearestPointDistance：currentLocation]> 200.0）{
NSLog（@Hay que recalcular la ruta al destinoActual）;
}
if
SpinnerView * spinner = [SpinnerView loadSpinnerIntoView：self.view];
spinner.tag = 98;
while（！[mapView recalculateRoutesTo：currentLocation]）{
// dohinhin ...
}
[spinner removeSpinner];
// [locationManager stopUpdatingLocation];
$ / code> 正如您所看到的那样，
// [locationManager stopUpdatingLocation];
会被评论。那么，这个问题让我感到疯狂的是，上面的代码在第一个视图控制器中起到了魅力的作用，并按我的预期定期更新。但在第二种观点中，它只是第一次运作，并且不会再更新。我在不同的时间对这些方法进行了编程，所以我不记得我是否对第一种观点做了些什么，但是我没有做到。但他们在同一个应用程序，所以我认为这是没有问题的库或权限。欢迎提供任何帮助或提示，谢谢！
发现解决方案这里。当我以这种方式启动locationManager时，locationManager会工作： if（self）{
locationManager = [[CLLocationManager alloc]在里面];
[locationManager setDelegate：self];
[locationManager setDistanceFilter：kCLHeadingFilterNone];
//将所需的精确度更改为kCLLocationAccuracyBest
[locationManager setDesiredAccuracy：kCLLocationAccuracyBest];
// SOLUTION：set setPausesLocationUpdatesAutomatically为NO
[locationManager setPausesLocationUpdatesAutomatically：NO];
[locationManager startUpdatingLocation];
}
无论如何，我会像Rob建议的那样表现工作。感谢所有人的帮助！
EDIT: Ok, I just have noticed that the problem is exclusive of iOS 7. I'm still being unable to solve it, however, so I suppouse I'll try with the sugestions bellow. Thanks to all!
¡Hi! I'm programming a navigator app, and I need to update the user position whenever is possible. I have two View Controllers that use CLLocation manager. In both of them I've added this line:
#import <CoreLocation/CoreLocation.h>
And then added the to the interface declaration, and I'm setting this as a property in the .h file, and synthetizing afterwards:
@property (strong, nonatomic) CLLocationManager *locationManager;
After that, I'm launching de locationManager in the viewDidLoad, this way:
if(self){
locationManager = [[CLLocationManager alloc] init];
//locationManager.delegate = self;
[locationManager setDelegate:self];
[locationManager setDistanceFilter:kCLHeadingFilterNone];
[locationManager setDesiredAccuracy:kCLLocationAccuracyBestForNavigation];
[locationManager startUpdatingLocation];
}
And here are my delegate methods.
For the first View:
#pragma mark - CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(@"didFailWithError: %@", error);
UIAlertView *errorAlert = [[UIAlertView alloc]
initWithTitle:@"Error" message:@"Failed to Get Your Location" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[errorAlert show];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(@"didUpdateToLocation: %@", newLocation);
CLLocation *currentLocation = newLocation;
if (currentLocation != nil) {
homeLatitude = [[NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude] doubleValue];
homeLongitude = [[NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude] doubleValue];
NSLog(@"Updated! -> hl = %f, hlg = %f", homeLatitude, homeLongitude);
}
}
For the second view. As you can see, I replaced the old didUpdateToLocation with didUpdateLocations, as a desperate try.
#pragma mark - CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(@"didFailWithError: %@", error);
UIAlertView *errorAlert = [[UIAlertView alloc]
initWithTitle:@"Error" message:@"Failed to Get Your Location" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[errorAlert show];
}
/*- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(@"didUpdateToLocation: %@", newLocation);
CLLocation *currentLocation = newLocation;
if (currentLocation != nil) {
NSLog(@"Tarzan boy");
_testLabel.text = [NSString stringWithFormat:@"Oh DAMN!!!!"];
}
}*/
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
NSLog(@"didUpdateToLocation: %@", [locations lastObject]);
CLLocation *currentLocation = [locations lastObject];
if (currentLocation != nil) {
currentLatitude = [[NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude] doubleValue];
currentLongitude = [[NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude] doubleValue];
NSLog(@"Updated! (MapWithRoutesViewController) -> hl = %f, hlg = %f", currentLatitude, currentLongitude);
_testLabel.text = [NSString stringWithFormat:@"Update! -> hl = %f, hlg = %f", currentLatitude, currentLongitude];
//Aquí es donde borramos el lugar al que llegaron.
if(mapView){
if(followMe){
CLLocationCoordinate2D *c = &((CLLocationCoordinate2D){.latitude = currentLatitude, .longitude = currentLongitude});
[mapView.mapView as_setCenterCoordinate:*c zoomLevel:32 animated:NO];
_ourStepper.value = [mapView.mapView as_zoomLevel];
}
if([mapView getNearestDestinyDistance:currentLocation] < 150.0){
NSLog(@"Hay que eliminar el primer destino del MapView");
mapView.destinoActual++;
}
if([mapView getNearestPointDistance:currentLocation] > 200.0){
NSLog(@"Hay que recalcular la ruta al destinoActual");
SpinnerView *spinner = [SpinnerView loadSpinnerIntoView:self.view];
spinner.tag = 98;
while (![mapView recalculateRoutesTo:currentLocation]) {
//do nothin...
}
[spinner removeSpinner];
}
}
}
//[locationManager stopUpdatingLocation];
}
As you can see, the line
//[locationManager stopUpdatingLocation];
is commented. Well, the problem is driving me crazy is that the code above works as a charm in the first view controller, and update periodically as I expected. But in the second view, it works only the first time, and never updates again. I programmed these methods in different times, so I can't remember if I did something to the first view I didn't to the second. But they are in the same app, so I assume there's no problem with libraries or permissions. Any help or hint is welcome, thanks!
解决方案
Found the solution here. The locationManager works when I launch it this way:
if(self){
locationManager = [[CLLocationManager alloc] init];
[locationManager setDelegate:self];
[locationManager setDistanceFilter:kCLHeadingFilterNone];
//change the desired accuracy to kCLLocationAccuracyBest
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
//SOLUTION: set setPausesLocationUpdatesAutomatically to NO
[locationManager setPausesLocationUpdatesAutomatically:NO];
[locationManager startUpdatingLocation];
}
I'll work anyway in performance like Rob suggested. Thanks to all for the help!
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