当前位置警报和点未显示在iOS8中

从iOS7移动到iOS8，我的应用程序不会显示当前位置的警报或蓝点。我试图根据我在这里读到的内容更改代码，现在警报正在显示，但只有一瞬间，没有机会选择任何内容。不用说，蓝点也不存在。 我的代码是：

MapName.h

MapName.m

我已将NSLOCATIONWHENISUSAGESCRIPTION字符串和我在警报中看到的消息添加到Info.plist中。问题已解决：

MapName.h

首先将密钥nsLocationWhenUsageDescription作为字符串添加到Info.plist

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

@interface MapName : UIViewController <MKMapViewDelegate>

@property (strong, nonatomic) IBOutlet MKMapView *MapName;
@property (nonatomic, retain) CLRegion *region;
@property (nonatomic) BOOL showsUserLocation;

@end

//in the (void)viewDiDLoad section
CLLocationManager *locationManager = [[CLLocationManager alloc]init];
locationManager.delegate = _MapName;  //Assigning to 'id<CLLocationManagerDelegate>' from incompatible type 'MKMapView*_strong' warning showing here
[locationManager requestWhenInUseAuthorization];
[locationManager startUpdatingLocation];
CLAuthorizationStatus status = [CLLocationManager authorizationStatus];
if (status == kCLAuthorizationStatusDenied ||
    status == kCLAuthorizationStatusAuthorizedWhenInUse) {
    //UIApplication -openUrl: UIApplicationOpenSettingsURLString //this is the example shown on WWDC
}

[locationManager requestWhenInUseAuthorization];
[locationManager startMonitoringForRegion:_region];

#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

- (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;

}