iphone - -[CLLocationManager requestWhenInUseAuthorization] 或 -[CLLocationManager requestAlwaysAuthorization] 错误

Question

这是我的代码，显示 map 上当前位置的警报和蓝点:

MapName.h

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>


@interface MapName : UIViewController <MKMapViewDelegate, CLLocationManagerDelegate>

@property (strong, nonatomic) IBOutlet MKMapView *MapName;
@property (strong, nonatomic) CLLocationManager *locationManager;

@end

map 名称.m

- (void)viewDidLoad
{
[super viewDidLoad];

self.locationManager = [[CLLocationManager alloc]init];
self.locationManager.delegate = self;
if ([self.locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) {
    [self.locationManager requestWhenInUseAuthorization];
}
[self.locationManager startUpdatingLocation];

//Center the map
[self gotoLocation];

//Show current position
_MapName.showsUserLocation = YES;

}

我已将键 NSLocationWhenIsUseUsageDescription 作为字符串添加到 Info.plist 中。我在 Xcode 上仍然遇到同样的错误。

Answer 1

这是由于:

[self.locationManager startUpdatingLocation];

和

_MapName.showsUserLocation = YES;

在调用这些之前，您需要检查用户是否已授予权限。还要确保关闭 Storyboard 上 MKMapKit 中的用户位置(这花了我几天时间才找到)。

做类似的事情:

CLAuthorizationStatus authorizationStatus= [CLLocationManager authorizationStatus];

if (authorizationStatus == kCLAuthorizationStatusAuthorized ||
    authorizationStatus == kCLAuthorizationStatusAuthorizedAlways ||
    authorizationStatus == kCLAuthorizationStatusAuthorizedWhenInUse) {

    [self.locationManager startUpdatingLocation];       
    _MapName.showsUserLocation = YES;        

}

根据您的应用，您可能不想在启动时请求用户的许可，因为不建议这样做。