pragma mark - CLLocationManagerDelegate方法

Question

我正在尝试在MapView上显示我当前的位置。我在故事板上添加了一个按钮。

第一个问题：我的屏幕上没有显示当前位置。

第二个问题：如果我点击按钮，MapView就不会缩放到该位置。

我的ViewController.m：（按钮方法名称为：getLocation）

#import "ViewController.h"
@import CoreLocation;


@interface ViewController () <CLLocationManagerDelegate>
@property (strong, nonatomic) CLLocationManager *locationManager;

@end

@implementation ViewController
@synthesize mapview = _mapview;

- (void)viewDidLoad {

    [super viewDidLoad];


    self.locationManager = [[CLLocationManager alloc] init];
    self.locationManager.delegate = self;

    if ([self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
        [self.locationManager requestWhenInUseAuthorization];
    }
    mapview.showsUserLocation = YES;
    [self.locationManager startUpdatingLocation];

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(IBAction)setMap:(id)sender
{
    switch (((UISegmentedControl *) sender).selectedSegmentIndex) {
        case 0:
            mapview.mapType = MKMapTypeStandard;
            break;
        case 1:
            mapview.mapType = MKMapTypeSatellite;
            break;
        case 2:
            mapview.mapType = MKMapTypeHybrid;
            break;
        default:
            break;
    }
}


// The sender here are a Button on my Storyboard, who should show the current device Location if i click on it.
-(IBAction)getLocation:(id)sender
{
    mapview.showsUserLocation = YES;
    //NSLog(@"Koordinaten des Geräts: %@", mapview.userLocation.description );
    //[mapview setCenterCoordinate:mapview.userLocation.coordinate animated:YES];
}
@end

Answer 1

您可能缺少info.plist文件中的 NSLocationWhenInUseUsageDescription ，并且需要iOS 8以上版本，您可以选择将其值保留为空。在过去，可以选择包括一个NSLocationUsageDescription＆＃39; key，一个字符串，向用户解释计划使用位置服务的应用程序。现在它被分成两个单独的键（ NSLocationWhenInUseUsageDescription 和 NSLocationAlwaysUsageDescription ），现在是强制性的;如果您在没有相应密钥的情况下调用requestWhenInUseAuthorization或requestAlwaysAuthorization，则提示只是不会显示给用户。

请注意，如果您指定 requestAlwaysAuthorization 键，但您的应用始终没有使用定位器，最好是在后台，那么您可以在应用商店提交期间面临苹果的拒绝

Answer 2

pragma mark - CLLocationManagerDelegate方法

-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
   CLLocation *newLocation = locations.lastObject;
}
- (void)locationManager: (CLLocationManager *)manager didFailWithError: (NSError *)error
{
}

对于缩放试试这个

@property (weak, nonatomic) IBOutlet MKMapView *mapAllLocations;
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;

mapAllLocations.ZoomEnabled = true;
mapAllLocations.ScrollEnabled = true;
CLLocationCoordinate2D zoomLocation;

zoomLocation.latitude =newLocation.latitude;
zoomLocation.longitude=newLocation.longitude;

MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(zoomLocation,1000.0, 1000.0);
[self.mapAllLocations setRegion:viewRegion animated:YES];

MapView不会加载当前用户位置，也不会对其进行居中/缩放

2 个答案:

pragma mark - CLLocationManagerDelegate方法