我有这段代码要等待一段时间才能获得高精度数据：
-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
if((newLocation.horizontalAccuracy < 150 && newLocation.horizontalAccuracy > 0 /* valid */ && abs(howRecent) < 15.0 /*If it's a relatively recent event less than 15 seconds */))
}
我的应用程序其他部分的问题我需要等待这个方法回来，所以我使用了：
[NSThread sleepForTimeInterval:5]; // wait 5 seconds
这是一个好的做法，还是有更好的方法来等待另一个任务执行。
Apple 已经提供了一个示例项目来演示这个确切的场景。该项目被调用LocateMe，可以在这里找到。
您可以在 中找到相关方法GetLocationViewController.m。
简而言之，其背后的逻辑是丢弃任何缓存值并累积位置读数，直到horizontalAccuracy满足desiredAccuracy要求。我希望这会让你走上正轨。
#import "LocationTracker.h"
#define LATITUDE @"latitude"
#define LONGITUDE @"longitude"
#define ACCURACY @"theAccuracy"
#define IS_OS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
@implementation LocationTracker
AppDelegate *objApp;
+ (CLLocationManager *)sharedLocationManager {
static CLLocationManager *_locationManager;
@synchronized(self) {
if (_locationManager == nil) {
_locationManager = [[CLLocationManager alloc] init];
_locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
}
}
return _locationManager;
}
- (id)init {
if (self==[super init]) {
//Get the share model and also initialize myLocationArray
self.shareModel = [LocationShareModel sharedModel];
self.shareModel.myLocationArray = [[NSMutableArray alloc]init];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(applicationEnterBackground) name:UIApplicationDidEnterBackgroundNotification object:nil];
objApp = (AppDelegate *)[[UIApplication sharedApplication] delegate];
}
return self;
}
-(void)applicationEnterBackground{
CLLocationManager *locationManager = [LocationTracker sharedLocationManager];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
locationManager.distanceFilter = kCLDistanceFilterNone;
if(IS_OS_8_OR_LATER) {
[locationManager requestAlwaysAuthorization];
}
[locationManager startUpdatingLocation];
//Use the BackgroundTaskManager to manage all the background Task
self.shareModel.bgTask = [BackgroundTaskManager sharedBackgroundTaskManager];
[self.shareModel.bgTask beginNewBackgroundTask];
}
- (void) restartLocationUpdates
{
NSLog(@"restartLocationUpdates");
if (self.shareModel.timer) {
[self.shareModel.timer invalidate];
self.shareModel.timer = nil;
}
CLLocationManager *locationManager = [LocationTracker sharedLocationManager];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
locationManager.distanceFilter = kCLDistanceFilterNone;
if(IS_OS_8_OR_LATER) {
[locationManager requestAlwaysAuthorization];
}
[locationManager startUpdatingLocation];
}
- (void)startLocationTracking {
NSLog(@"startLocationTracking");
if ([CLLocationManager locationServicesEnabled] == NO) {
NSLog(@"locationServicesEnabled false");
UIAlertView *servicesDisabledAlert = [[UIAlertView alloc] initWithTitle:@"Location Services Disabled" message:@"You currently have all location services for this device disabled" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[servicesDisabledAlert show];
} else {
CLAuthorizationStatus authorizationStatus= [CLLocationManager authorizationStatus];
if(authorizationStatus == kCLAuthorizationStatusDenied || authorizationStatus == kCLAuthorizationStatusRestricted){
NSLog(@"authorizationStatus failed");
} else {
NSLog(@"authorizationStatus authorized");
CLLocationManager *locationManager = [LocationTracker sharedLocationManager];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
locationManager.distanceFilter = kCLDistanceFilterNone;
if(IS_OS_8_OR_LATER) {
[locationManager requestAlwaysAuthorization];
}
[locationManager startUpdatingLocation];
}
}
}
- (void)stopLocationTracking {
NSLog(@"stopLocationTracking");
if (self.shareModel.timer) {
[self.shareModel.timer invalidate];
self.shareModel.timer = nil;
}
CLLocationManager *locationManager = [LocationTracker sharedLocationManager];
[locationManager stopUpdatingLocation];
}
#pragma mark - CLLocationManagerDelegate Methods
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
NSLog(@"locationManager didUpdateLocations");
for(int i=0;i<locations.count;i++){
CLLocation * newLocation = [locations objectAtIndex:i];
CLLocationCoordinate2D theLocation = newLocation.coordinate;
CLLocationAccuracy theAccuracy = newLocation.horizontalAccuracy;
NSTimeInterval locationAge = -[newLocation.timestamp timeIntervalSinceNow];
if (locationAge > 30.0)
{
continue;
}
//Select only valid location and also location with good accuracy
if(newLocation!=nil&&theAccuracy>0
&&theAccuracy<2000
&&(!(theLocation.latitude==0.0&&theLocation.longitude==0.0))){
self.myLastLocation = theLocation;
self.myLastLocationAccuracy= theAccuracy;
NSMutableDictionary * dict = [[NSMutableDictionary alloc]init];
[dict setObject:[NSNumber numberWithFloat:theLocation.latitude] forKey:@"latitude"];
[dict setObject:[NSNumber numberWithFloat:theLocation.longitude] forKey:@"longitude"];
[dict setObject:[NSNumber numberWithFloat:theAccuracy] forKey:@"theAccuracy"];
//Add the vallid location with good accuracy into an array
//Every 1 minute, I will select the best location based on accuracy and send to server
[self.shareModel.myLocationArray addObject:dict];
}
}
//If the timer still valid, return it (Will not run the code below)
if (self.shareModel.timer) {
return;
}
self.shareModel.bgTask = [BackgroundTaskManager sharedBackgroundTaskManager];
[self.shareModel.bgTask beginNewBackgroundTask];
//Restart the locationMaanger after 1 minute
self.shareModel.timer = [NSTimer scheduledTimerWithTimeInterval:30 target:self
selector:@selector(restartLocationUpdates)
userInfo:nil
repeats:NO];
//Will only stop the locationManager after 10 seconds, so that we can get some accurate locations
//The location manager will only operate for 10 seconds to save battery
if (self.shareModel.delay10Seconds) {
[self.shareModel.delay10Seconds invalidate];
self.shareModel.delay10Seconds = nil;
}
self.shareModel.delay10Seconds = [NSTimer scheduledTimerWithTimeInterval:10 target:self
selector:@selector(stopLocationDelayBy10Seconds)
userInfo:nil
repeats:NO];
}
//Stop the locationManager
-(void)stopLocationDelayBy10Seconds{
CLLocationManager *locationManager = [LocationTracker sharedLocationManager];
[locationManager stopUpdatingLocation];
NSLog(@"locationManager stop Updating after 10 seconds");
}
- (void)locationManager: (CLLocationManager *)manager didFailWithError: (NSError *)error
{
// NSLog(@"locationManager error:%@",error);
switch([error code])
{
case kCLErrorNetwork: // general, network-related error
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Network Error" message:@"Please check your network connection." delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[alert show];
}
break;
case kCLErrorDenied:{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Enable Location Service" message:@"You have to enable the Location Service to use this App. To enable, please go to Settings->Privacy->Location Services" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
[alert show];
}
break;
default:
{
}
break;
}
}
//Send the location to Server
- (void)updateLocationToServer {
NSLog(@"updateLocationToServer");
// Find the best location from the array based on accuracy
NSMutableDictionary * myBestLocation = [[NSMutableDictionary alloc]init];
for(int i=0;i<self.shareModel.myLocationArray.count;i++){
NSMutableDictionary * currentLocation = [self.shareModel.myLocationArray objectAtIndex:i];
if(i==0)
myBestLocation = currentLocation;
else{
if([[currentLocation objectForKey:ACCURACY]floatValue]<=[[myBestLocation objectForKey:ACCURACY]floatValue]){
myBestLocation = currentLocation;
}
}
}
NSLog(@"My Best location:%@",myBestLocation);
//If the array is 0, get the last location
//Sometimes due to network issue or unknown reason, you could not get the location during that period, the best you can do is sending the last known location to the server
if(self.shareModel.myLocationArray.count==0)
{
NSLog(@"Unable to get location, use the last known location");
self.myLocation=self.myLastLocation;
self.myLocationAccuracy=self.myLastLocationAccuracy;
}else{
CLLocationCoordinate2D theBestLocation;
theBestLocation.latitude =[[myBestLocation objectForKey:LATITUDE]floatValue];
theBestLocation.longitude =[[myBestLocation objectForKey:LONGITUDE]floatValue];
self.myLocation=theBestLocation;
self.myLocationAccuracy =[[myBestLocation objectForKey:ACCURACY]floatValue];
}
NSLog(@"Send to Server: Latitude(%f) Longitude(%f) Accuracy(%f)",self.myLocation.latitude, self.myLocation.longitude,self.myLocationAccuracy);
//TODO: Your code to send the self.myLocation and self.myLocationAccuracy to your server
//After sending the location to the server successful, remember to clear the current array with the following code. It is to make sure that you clear up old location in the array and add the new locations from locationManager
[self.shareModel.myLocationArray removeAllObjects];
self.shareModel.myLocationArray = nil;
self.shareModel.myLocationArray = [[NSMutableArray alloc]init];
}
@end