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我想实现的目标：我想在视图中显示用户地址。视图由视图控制器处理。此 VC 正在使用 GeoAPI 来访问用户位置。GeoAPI 包裹在 LocationManager-Class 周围，后者又负责处理所有 locationmanager 的东西。在这个位置管理器类中，我想如上所述反向地理编码。

geoAPI 有一些方便的方法可以用来获取我想要的信息。

地理API：

#import <Foundation/Foundation.h>

@interface MFGeoAPI : NSObject
@property (nonatomic, strong) NSDictionary *userLocationInfoDict;

+ (MFGeoAPI *)sharedInstance;
- (CLLocation *)getCurrentUserLocation;

@end

@interface MFGeoAPI () {
    LocationManager *locationManager;
    MotionManager *motionManager;
}
@end

@implementation MFGeoAPI

+(MFGeoAPI *)sharedInstance {
    static MFGeoAPI *_sharedInstance = nil;
    static dispatch_once_t oncePredicate;
    dispatch_once(&oncePredicate, ^{
        _sharedInstance = [[MFGeoAPI alloc] init];
    });
    return _sharedInstance;
}

- (id)init {
    if (self = [super init]) {
        locationManager = [[LocationManager alloc] initLocationManager];
        motionManager = [[MotionManager alloc] initMotionManager];
    }
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getUserLocationInformation:) name:@"UserLocationInfo" object:nil];
    return self;
}

- (CLLocation *)getCurrentUserLocation {
    return [locationManager getCurrentUserLocation];
}

- (void)getUserLocationInformation:(NSNotification *)notification {
    NSLog(@"OK");
    self.userLocationInfoDict = [[NSDictionary alloc] initWithDictionary:notification.userInfo];
}


@end

现在..由于反向地理编码功能的异步字符的事实，我不确定何时可以使用带有用户地址的字典。

位置管理器类包含以下内容：

位置经理：

#import <Foundation/Foundation.h>
#import <CoreLocation/CoreLocation.h>

@interface LocationManager : NSObject <CLLocationManagerDelegate>
@property (nonatomic, strong) CLLocationManager *locationManager;
@property (nonatomic, strong) CLLocation *userLocation;
@property (nonatomic, strong) NSDictionary *userLocDict;

- (id)initLocationManager;
- (CLLocation *)getCurrentUserLocation;
@end

#import "LocationManager.h"

@implementation LocationManager
- (id)initLocationManager {
    if (self = [super init]) {
        if (self.locationManager == nil) {
            self.locationManager = [[CLLocationManager alloc] init];
            self.locationManager.delegate = self;

            if (![self.locationManager locationServicesEnabled]) {
                UIAlertView *servicesDisabledAlert = [[UIAlertView alloc] initWithTitle:@"Location Services Disabled" message:@"You currently have all location services for this device disabled. If you proceed, you will be asked to confirm whether location services should be reenabled." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
                [servicesDisabledAlert show];
            }
        }
        [self startUpdatingLocation];
        [self startFetchingCurrentUserLocationInformation];
    }
    return self;
}

- (void)startUpdatingLocation {
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    self.locationManager.headingFilter = kCLHeadingFilterNone;
    [self.locationManager startUpdatingHeading];
    [self.locationManager startUpdatingLocation];
    self.userLocation = self.locationManager.location;
}

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    NSLog(@"FAILED");
}

- (CLLocation *)getCurrentUserLocation {
    return self.userLocation;
}

- (void)startFetchingCurrentUserLocationInformation {
    [self delayedReverseGeocodeLocation];
}

- (void)delayedReverseGeocodeLocation {
    [NSObject cancelPreviousPerformRequestsWithTarget:self];
    [self reverseGeocodeLocation];
}
- (void)reverseGeocodeLocation {

    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    [geocoder reverseGeocodeLocation:self.userLocation completionHandler:^(NSArray *placemarks, NSError *error) {
        NSDictionary *dict = [[placemarks firstObject] addressDictionary];
        if (placemarks.count > 0) {
            NSDictionary *info = [NSDictionary dictionaryWithObject:dict forKey:@"transferDict"];
            [[NSNotificationCenter defaultCenter] postNotificationName:@"UserLocationInfo" object:self userInfo:info];
        }
    }];
}

在视图控制器中，我想访问我通过 API 传递的 userLocation 信息字典

视图控制器

- (id)init {
    if (self = [super init]) {
        self.userLocation = [[MFGeoAPI sharedInstance] getCurrentUserLocation];
        NSLog(@"%@", [[MFGeoAPI sharedInstance].userLocationInfoDict description]);
    }
    return self;
}

但是 userlocationInfoDict 是空的。我想这是因为我的函数调用“startFetchingCurrentUserLocationInformation”在异步块返回我需要的值之前返回。然后我想通过 NSNotificationCenter 处理这个问题，我会在数据可用时收到通知。但现在我被困住了：

我需要做什么才能访问 GeoAPI 传递的 userLocationInformation 以便在数据到达时及时执行此操作？

任何帮助表示赞赏！谢谢塞巴斯蒂安

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