我目前有一张显示用户当前位置的地图,还有几个注释标记(我还没有把它们放在一个数组中,但很快就会)。我试图让我的 iphone 应用程序在用户到达某些位置时触发警报。我怎么做?这就是我现在所拥有的...
视图控制器.h
#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>
#import "MapAnnotation.h"
@interface ViewController : UIViewController <CLLocationManagerDelegate, MKMapViewDelegate>
{
CLLocationManager *locationManager;
IBOutlet MKMapView *worldView;
}
@end
视图控制器.m
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
[worldView setShowsUserLocation:YES];
}
- (void)mapView:(MKMapView *)mapView
didUpdateUserLocation:(MKUserLocation *)userLocation
{
CLLocationCoordinate2D loc = [userLocation coordinate];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, 250, 250);
[worldView setRegion:region animated:YES];
MKCoordinateRegion pin = { {0.0, 0.0 }, {0.0, 0.0 } };
pin.center.latitude = 53.363581;
pin.center.longitude = -6.258183;
pin.span.longitudeDelta = 0.01f;
pin.span.latitudeDelta = 0.01f;
[worldView setRegion:pin animated:YES];
MapAnnotation *stage1 = [[MapAnnotation alloc] init];
stage1.title = @"Quinn's";
stage1.coordinate = pin.center;
[worldView addAnnotation:stage1];
MKCoordinateRegion pin2 = { {0.0, 0.0 }, {0.0, 0.0 } };
pin2.center.latitude = 53.364678;
pin2.center.longitude = -6.263009;
pin2.span.longitudeDelta = 0.01f;
pin2.span.latitudeDelta = 0.01f;
[worldView setRegion:pin2 animated:YES];
MapAnnotation *stage2 = [[MapAnnotation alloc] init];
stage2.title = @"Neighbour";
stage2.coordinate = pin2.center;
[worldView addAnnotation:stage2];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Create location manager object
locationManager = [[CLLocationManager alloc] init];
// Setting Delegate as AnotherMapFirstViewController
[locationManager setDelegate:self];
// And we want it to be as accurate as possible
// regardless of how much time/power it takes
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
self.title = NSLocalizedString(@"First", @"First");
self.tabBarItem.image = [UIImage imageNamed:@"first"];
}
return self;
}
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
{
NSLog(@"%@", newLocation);
}
- (void)locationManager:(CLLocationManager *)manager
didFailWithError:(NSError *)error
{
NSLog(@"Could not find location: %@", error);
}
- (void)dealloc
{
// Tell the location manager to stop sending us messages
[locationManager setDelegate:nil];
}
@end