如何在用户当前位置设置图钉的位置？答案

【问题标题】：How do I set a pin's location on the user's current location?如何在用户当前位置设置图钉的位置？
【发布时间】：2014-08-14 00:39:06
【问题描述】：

//.h file
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
@interface MapMain : UIViewController <MKMapViewDelegate>
{
MKMapView *mapView;
CLLocationManager *locationManager;
}

@property (nonatomic, retain) IBOutlet MKMapView *mapView;

-(IBAction)GetLocation:(id)sender;
-(IBAction)SetPin:(id)sender;

@end

//code within .m

- (void)viewDidLoad
{
self.mapView.showsUserLocation = YES;
self.mapView.delegate = self;
[self.mapView setUserTrackingMode:MKUserTrackingModeFollow animated:YES];
// Do any additional setup after loading the view.
locationManager = [[CLLocationManager alloc] init];
locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m
[locationManager startUpdatingLocation];

}


-(NSString *)deviceLocation {
return [NSString stringWithFormat:@"latitude: %f longitude: %f",    locationManager.location.coordinate.latitude, locationManager.location.coordinate.longitude];
}


-(IBAction)SetPin:(id)sender
{
NSLog(@"%@", [self deviceLocation]);

Pin *newPin = [[Pin alloc]init];
newPin.coordinate = 
newPin.title = @"Title Tester";
newPin.subtitle = @"Sub Tester";
[self.mapView addAnnotation:newPin];

}

在“设置 Pin”中，我想将 newPin 的坐标设置为用户当前位置。我找到了函数“deviceLocation”，但不知道如何调用它并在我的 SetPin 函数中使用它。

请帮忙！！！

【问题讨论】：

标签： objective-c annotations location

【解决方案1】：

在 MKMapView.h 的 MKMapViewDelegate 部分查看以下方法

- (void)mapViewWillStartLocatingUser:(MKMapView *)mapView NS_AVAILABLE(10_9, 4_0);
- (void)mapViewDidStopLocatingUser:(MKMapView *)mapView NS_AVAILABLE(10_9, 4_0);
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation NS_AVAILABLE(10_9, 4_0);
- (void)mapView:(MKMapView *)mapView didFailToLocateUserWithError:(NSError *)error NS_AVAILABLE(10_9, 4_0);

特别是mapView:didUpdateUserLocation: 从那里您可以获取用户位置并为您的心脏内容设置注释。

【讨论】：