我在我的应用上遇到了mapview
。加载mapview
时屏幕时,地图只会打开mapviews
的默认位置。但是,当我返回上一个scren然后第二次启动地图时,会显示正确的位置。
显然,这并不理想。
有什么建议吗?
我的代码是:
CLLocation *mapLocation = [[CLLocation alloc] initWithLatitude:latitude longitude:longitude];
[[self map] setCenterCoordinate:[mapLocation coordinate]];
[[self map] setRegion: MKCoordinateRegionMakeWithDistance([mapLocation coordinate], 1000, 1000)];
MapAnnotation *annotation = [[MapAnnotation alloc] init];
[annotation setCoordinate:[mapLocation coordinate]];
[[self map] addAnnotation:annotation];
谢谢!
答案 0 :(得分:0)
我像这样设置当前位置:
Location.h:
@interface WhereamiViewController : UIViewController <CLLocationManagerDelegate, MKMapViewDelegate, UITextFieldDelegate> {
CLLocationManager *locationManager;
MKMapView *worldView;
IBOutlet UIActivityIndicatorView *activityIndicator;
IBOutlet UITextField *locationTextField;
}
- (void)findLocation;
- (void)foundLocation:(CLLocation *)loc;
- (IBAction)setMapTyp:(id)sender;
@property MKMapType mapType;
@property (nonatomic, retain) IBOutlet MKMapView *worldView;
@property (nonatomic, readonly) NSDate *currentDate;
@end
Location.m:
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
NSLog(@"%@", newLocation);
NSTimeInterval t = [[newLocation timestamp] timeIntervalSinceNow];
if (t < -180) {
return;
}
[self foundLocation:newLocation];
}
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation {
CLLocationCoordinate2D loc = [userLocation coordinate];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, 250, 250);
[worldView setRegion:region animated:YES];
}
- (void)locationManager:(CLLocationManager *)manager
didFailWithError:(NSError *)error {
NSLog(@"Could not find location: %@", error);
}
- (void)findLocation {
[locationManager startUpdatingLocation];
[activityIndicator startAnimating];
[locationTextField setHidden:YES];
}
- (void)foundLocation:(CLLocation *)loc {
CLLocationCoordinate2D coord = [loc coordinate];
NSDateFormatter *format = [[NSDateFormatter alloc] init];
[format setDateFormat:@"HH:mm, dd. MMM. yyyy "];
NSDate *now = [[NSDate alloc] init];
NSString *dateString = [format stringFromDate:now];
MyOwnMapPoint *mp = [[MyOwnMapPoint alloc] initWithCoordinate:coord
title:[locationTextField text]
subtitle:dateString];
NSLog(@"Die Uhrzeit ist: %@", dateString);
[worldView addAnnotation:mp];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(coord, 250, 250);
[worldView setRegion:region animated:YES];
//Reset the UI
[locationTextField setText:@""];
[activityIndicator stopAnimating];
[locationTextField setHidden:NO];
[locationManager stopUpdatingLocation];
}
希望它给你一个想法!