我尝试使用 MapKit 和 CoreLocation 获取用户当前位置。我对 Objective-C 真的很陌生。就我的研究而言,旧版 iOS 到 iOS 8.0 的实现略有不同。我已经正确地遵循了一切。它仍在获取当前位置。我的实际目标是在运行时当用户在文本字段中给出位置时在 mapKit 上获取固定用户位置。
filename.h
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
@interface LocationSelectionViewController : UIViewController <CLLocationManagerDelegate>
@property (weak, nonatomic) IBOutlet UITextField *insertLocation;
@property (strong, nonatomic) IBOutlet MKMapView *serviceLocation;
- (IBAction)next:(id)sender;
@end
#import "LocationSelectionViewController.h"
#import <CoreLocation/CoreLocation.h>
@interface LocationSelectionViewController () <CLLocationManagerDelegate>
@end
@implementation LocationSelectionViewController
CLLocationManager *locationManager;
@synthesize serviceLocation;
- (void)viewDidLoad {
[super viewDidLoad];
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
[locationManager requestAlwaysAuthorization];
[locationManager startUpdatingLocation];
// Do any additional setup after loading the view.
self.serviceLocation = [[MKMapView alloc] initWithFrame:self.view.bounds];
self.serviceLocation.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self.view addSubview:self.serviceLocation];
[self.serviceLocation.delegate self];
//[self.serviceLocation setShowsUserLocation:YES];
}
/*- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation{
CLLocationCoordinate2D loc=[userLocation coordinate];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, 100, 100);
[self.serviceLocation setRegion:region animated:YES];
}*/
-(void) locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations{
[locationManager requestAlwaysAuthorization];
[locationManager startUpdatingLocation];
}
-(void) locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status{
if(status == kCLAuthorizationStatusAuthorizedAlways || status == kCLAuthorizationStatusAuthorizedWhenInUse){
self.serviceLocation.showsUserLocation = YES;
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
- (IBAction)next:(id)sender {
}
@end
如图所示,我已根据 iOS 8 要求添加了两个属性。
任何人都可以建议我存档此内容:
- 获取用户当前位置。
- 在运行时从文本字段获取位置并固定在 MapKip 上。
您请求和开始位置更新的流程不正确。首先requestAlwaysAuthorization
不会立即改变授权状态,因为它需要用户按下Allow
or Don't Allow
警报中的按钮。因此,您应该在获得结果后才开始位置更新。然后在didUpdateLocations
无需重新请求/开始。
按照以下方式进行,
Dn your viewDidLoad
BOOL isAuthorized = [CLLocationManager authorizationStatus] == kCLAuthorizationStatusAuthorizedAlways;
if (isAuthorized) {
[locationManager startUpdatingLocation];
}
else {
[locationManager requestAlwaysAuthorization];
}
并实现委托方法,例如
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations {
CLLocation *current = locations.firstObject;
}
- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status{
if(status == kCLAuthorizationStatusAuthorizedAlways || status == kCLAuthorizationStatusAuthorizedWhenInUse){
self.serviceLocation.showsUserLocation = YES;
[locationManager startUpdatingLocation];
}
}
在 iOS 8 中,为了请求权限,您应该在info.plist
。在你的情况下关键是NSLocationAlwaysUsageDescription
.
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