iPhone应用程序 - 如何只获取当前位置一次并存储将用于另一个功能？ [英] iphone app - how to get the current location only once and store that to be used in another function?
问题描述
过去两周我一直在研究这个问题 - 我有一个应用程序，它在地图上显示从起点到目的地点的清晰路线。目标点是用户地址（由用户在我们设置的设置菜单中定义/输入），如果我硬编码起点，地图，路线和应用程序都可以正常工作。一旦我尝试实现任何涉及使用cllocation或cllocationmanager的东西，它崩溃并给我一个线程错误（有3个）。
I've been working on this for the past 2 weeks - i have an app that shows a legible route on a map that goes from a start point to a destination point. the destination point is the users address (as defined/entered by the user in the settings menu we have set up) and if i hard code the start point, the map, route and application all work fine. once i try to implement anything that involves using the cllocation or cllocationmanager, it crashes and gives me a thread error (there are 3).
这是当前的视图控制器标题&实现文件：
Here is the current view controller header & implementation file for this:
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import "MapView.h"
#import "Place.h"
#import <CoreLocation/CoreLocation.h>
@interface HomeMapViewController : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate>{
IBOutlet UILabel *HomeAddressLabel;
}
@property (weak, nonatomic) IBOutlet MKMapView *MapView;
@property (strong, nonatomic) IBOutlet CLLocationManager *location;
@end
实施档案：
#import "HomeMapViewController.h"
@interface HomeMapViewController ()
@end
@implementation HomeMapViewController
@synthesize MapView;
@synthesize location;
double lat = 37.331706;
double lon = -122.030598;
- (id)initWithNibNameNSString *)nibNameOrNil bundleNSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
//Retrieve saved address before view loads
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *HomeAddress = [defaults objectForKey:@"HomeAddress"];
NSString *HomeCity = [defaults objectForKey:@"HomeCity"];
NSString *HomeProvince = [defaults objectForKey:@"HomeProvince"];
NSString *HomeZip = [defaults objectForKey:@"HomeZip"];
NSString *HomeCountry = [defaults objectForKey:@"HomeCountry"];
NSString *HomeAddressFull = [NSString stringWithFormat:@"%@, %@, %@, %@, %@", HomeAddress, HomeCity, HomeProvince, HomeZip, HomeCountry];
//Set address label to saved address values
HomeAddressLabel.text = HomeAddressFull;
//Map Route Code
MapView* mapView = [[MapView alloc] initWithFrame:
CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
//Shows user location
[self.MapView setShowsUserLocation:YES];
//set which mapview to show
[self.MapView addSubview:mapView];
self.location = [[CLLocationManager alloc]init];
location.delegate = self;
location.desiredAccuracy=kCLLocationAccuracyBest;
location.distanceFilter = kCLLocationAccuracyBestForNavigation;//constant update of device location
[location startUpdatingLocation];
Place* start = [[Place alloc] init];
start.name = @"Start Location";
start.description = @"You started here.";
//^should be changed to current location once that is implemented
//start.latitude = 37.331706;
//start.longitude = -122.030598;
start.latitude = lat;
start.longitude = lon;
//start.latitude = location.location.coordinate.latitude;
//start.longitude = location.location.coordinate.longitude;
//Geocoder Code
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
[geocoder geocodeAddressString:HomeAddressFull completionHandler:^(NSArray *placemarks, NSError *error) {
if (error) {
NSLog(@"Error: %@", [error localizedDescription]);
return;
}
for (id object in placemarks) {
CLPlacemark *placemark = object;
Place* destination = [[Place alloc] init];
destination.name = @"Destination";
destination.description = [NSString stringWithFormat:@"%@, %@, %@", HomeAddress, HomeCity, HomeProvince];
destination.latitude = placemark.location.coordinate.latitude;
destination.longitude = placemark.location.coordinate.longitude;
[mapView showRouteFrom:start toestination];
}
}];
[super viewDidLoad];
}
- (void)locationManagerCLLocationManager *)manager didUpdateToLocationCLLocation *)newLocation fromLocationCLLocation *)oldLocation{
[manager stopUpdatingLocation];
}
//************NEW METHOD
-(void)locationManagerCLLocationManager *)manager didFailWithErrorNSError *)error{
NSString *msg = @"Error obtraining location:";
UIAlertView *alert;
alert = [[UIAlertView alloc]
initWithTitle:@"Error"
message:msg delegate:self
cancelButtonTitle:@"OK"
otherButtonTitles: nil];
[alert show];
}
- (void)viewDidUnload
{
[self setMapView:nil];
HomeAddressLabel = nil;
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientationUIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
@end
我' d基本上想问一下是否有人可以帮助我了解如何获取用户当前位置坐标并将其存储为start.latitude和start.longitude值，以便路径显示从用户当前位置到他们的路径目的地。当用户移动时，路线不应该更新自己，我只想在用户当前位置和目的地上有一个注释/地标（就像我有的那样）然后蓝点（也就是用户）将能够看到自己沿着他们要走的路线前进。我已经在这里尝试了所有的建议 - 有些人根本没有工作，有些人只工作过一次，之后又失败了（甚至在重置模拟器内容之后！）。一些链接是相关的，但非常过时，所以那里的方法不起作用。
I'd basically like to ask if anyone can help shed some light on how I might go about getting the users current location coordinates and storing them as the start.latitude and start.longitude values so the route shows a pathway from the users current location to their destination. the route is not supposed to update itself as the user moves, I would just like to have an annotation/placemark on the users current location and destination (as i do have) and then the blue point (aka the user) will be able to see themselves move along the route they are to take. I've tried all the suggestions on here - and some havent worked at all, some worked only once and then after that it failed to work again (even after resetting the simulator content!). some links are relevant but very outdated so the methods there don't work.
在这里，我认为让用户当前的位置坐标将是这个功能更容易的任务！
And here i was thinking getting the users current location coordinates would be the easier task of this function!
推荐答案
.h档案
#import <CoreLocation/CoreLocation.h>
@property (nonatomic,retain) CLLocationManager *locationManager;
.m文件
- (NSString *)deviceLocation
{
NSString *theLocation = [NSString stringWithFormat:@"latitude: %f longitude: %f", self.locationManager.location.coordinate.latitude, self.locationManager.location.coordinate.longitude];
return theLocation;
}
- (void)viewDidLoad
{
self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.distanceFilter = kCLDistanceFilterNone;
self.locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m
[self.locationManager startUpdatingLocation];
}
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