我正在开发一个 iOS 应用程序,该应用程序专注于建筑物(校园)中的行人。我已经开发了一个足够好的(我相信)用户的位置更新,但是,我希望比我更专业的人给我一些提示,关于准确位置的建议,电池问题等。此外,是否可以停止位置更新和n秒后重新启动?是我为了节省能源而做的一个想法。就目前而言,应用程序正在检测当前位置,但是,蓝点(用户)仍在四处移动,我不喜欢这样。有什么可以做的吗?
下面是我的 didUpdateToLocation 方法:
应用程序正在从文件中读取建筑物的信息(存储在设备上)
- (void)viewDidLoad{
[super viewDidLoad];
if ([self checkForInternet]) {
_locationManager = [[CLLocationManager alloc] init];
_locationManager.delegate = self;
_locationManager.distanceFilter = 10.0f;
_locationManager.desiredAccuracy = 20.0f;
[_locationManager startUpdatingLocation];
}
}
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
if (newLocation.horizontalAccuracy > manager.desiredAccuracy) return;
[self.mapView removeAnnotations:listOfAnn];
[listOfAnn removeAllObjects];
if ([manager locationServicesEnabled]) {
for (NSString* row in rows){
NSArray* cells = [row componentsSeparatedByString:@"\t"];
CLLocationCoordinate2D newCoord;
newCoord.latitude = [[cells objectAtIndex:5]floatValue];
newCoord.longitude = [[cells objectAtIndex:6]floatValue];
CLLocation *locB = [[CLLocation alloc] initWithLatitude:newLocation.coordinate.latitude longitude:newLocation.coordinate.longitude];
CLLocation *centerLoc = [[CLLocation alloc] initWithLatitude:CAMPUS_LATITUDE longitude:CAMPUS_LONGITUDE];
CLLocationDistance borders = [locB distanceFromLocation:centerLoc];
if ((int)round(borders) > 500) {
BuildingViewController *newBuilding = [[BuildingViewController alloc] initBuildingWithName:[cells objectAtIndex:2] coordinates:newCoord shortDescription:[cells objectAtIndex:4] image:(NSString*)[cells objectAtIndex:3] inDistance: borders];
if ([[prefs stringForKey:newBuilding.title] isEqualToString:[prefs stringForKey:@"userName"]]) {
[newBuilding retrieveID];
[listOfAnn addObject:newBuilding];
}
} else{
CLLocation *locA = [[CLLocation alloc] initWithLatitude:newCoord.latitude longitude:newCoord.longitude];
CLLocationDistance distance = [locA distanceFromLocation:locB];
BuildingViewController *newBuilding = [[BuildingViewController alloc] initBuildingWithName:[cells objectAtIndex:2]
coordinates:newCoord shortDescription:[cells objectAtIndex:4] image:(NSString*)[cells objectAtIndex:3]
inDistance: distance];
if ((int)round(distance) < 100 ||
[[prefs stringForKey:newBuilding.title] isEqualToString:[prefs stringForKey:@"userName"]]){
[newBuilding retrieveID];
[listOfAnn addObject:newBuilding];
}
}
}
[self.mapView addAnnotations:listOfAnn];
}
}