获取当前用户所在位置的地址

Question

我遵循一些教程并混合了我糟糕的代码。现在我可以获得我当前的位置。当我点击按钮时，它会触发位于我当前位置的图钉。如果我点击图钉，该消息会显示我当前的地址。

我有两个问题：

1. 为什么我无法获得更精确的地址？现在我收到的地址包含国家、城市和地区，但没有道路名称。

2. 如何获取当前位置地址的“文本”？我想在其他地方的 UILabel 中显示地址，但不知道该怎么做。

非常感谢！

这是 .h

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

@interface UserLocationAddressViewController : UIViewController     <MKMapViewDelegate,MKReverseGeocoderDelegate>
{
    MKMapView *userLocationAddMapView;
    CLLocationManager *locationManager;
}

@property (nonatomic, retain) MKMapView *userLocationAddMapView;

-(IBAction)getUserLocationAddress:(id)sender;

@end

这是 .m

#import "UserLocationAddressViewController.h"

@implementation UserLocationAddressViewController

@synthesize userLocationAddMapView;

-(IBAction)getUserLocationAddress:(id)sender
{
    MKReverseGeocoder *geoCoder = [[MKReverseGeocoder alloc] initWithCoordinate:locationManager.location.coordinate];
    geoCoder.delegate = self;
    [geoCoder start]; 
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

-(void)dealloc
{
    [userLocationAddMapView release];
    [super dealloc];
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];

self.userLocationAddMapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
    userLocationAddMapView.showsUserLocation = YES;
    userLocationAddMapView.delegate = self;
    self.userLocationAddMapView.mapType = MKMapTypeStandard;

    locationManager = [[CLLocationManager alloc] init];
    [locationManager startUpdatingLocation];
    CLLocationCoordinate2D coordinate = locationManager.location.coordinate;

    MKCoordinateRegion mapRegion;
    mapRegion.center = coordinate;
    MKCoordinateSpan mapSpan;
    mapSpan.latitudeDelta = 0.006;
    mapSpan.longitudeDelta = 0.006;
    mapRegion.span = mapSpan;
    [userLocationAddMapView setRegion:mapRegion animated:YES];
    self.userLocationAddMapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    [self.view addSubview:self.userLocationAddMapView];

    self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"Get Add" style:UIBarButtonItemStylePlain target:self action:@selector(getUserLocationAddress:)] autorelease];  
}

-(void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark
{
    NSLog(@"placemark %f %f", placemark.coordinate.latitude, placemark.coordinate.longitude);
    NSLog(@"addressDictionary %@", placemark.addressDictionary);
    [userLocationAddMapView addAnnotations:[NSArray arrayWithObjects:placemark, nil]];
    [geocoder release];
}

-(void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error
{
    NSLog(@"reverseGeocoder fail");
    [geocoder release];
}

- (void)viewDidUnload
{
    [super viewDidUnload];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end

Answer 1

你不应该真正使用 MKReverseGeocoder，因为它已经被苹果在 iOS5 中贬值，你真的应该使用 CLGeocoder。下面的示例将返回基于 NSArray *placemarks 的一整吨信息，然后您可以迭代它们并调用 assoc 数组中的键。

#import "MapPoint.h"

@implementation MapPoint
@synthesize coordinate, title, dateAdded, subtitle, city, reverseGeo;

-(id)initWithCoordinates:(CLLocationCoordinate2D)c 
                   title:(NSString *)t {

    self = [super init];
    if (self) {

        coordinate = c;
        [self setTitle: t];
        [self setCurrentCity: [[CLLocation alloc] initWithLatitude:c.latitude longitude:c.longitude]];

        [self setDateAdded: [[NSDate alloc] init]];

    }
    return self;

}

-(void)setCurrentCity: (CLLocation *)loc {

    if (!self.reverseGeo) {
        self.reverseGeo = [[CLGeocoder alloc] init];
    }

    [self.reverseGeo reverseGeocodeLocation: loc completionHandler: 
     ^(NSArray *placemarks, NSError *error) {

         for (CLPlacemark *placemark in placemarks) {

             NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
             [formatter setTimeStyle:NSDateFormatterNoStyle];
             [formatter setDateStyle:NSDateFormatterLongStyle];

             NSString *dateString = [formatter stringFromDate: [self dateAdded]];
             [self setSubtitle: [dateString stringByAppendingString: [placemark locality] ] ];             

         }
     }];
}

@end

Answer 2

只需放置这个委托方法，我希望这可以帮助你。

-- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error {
    NSLog(@"MKReverseGeocoder has failed.");

}

-- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark {
    currentLocation = [placemark.locality stringByAppendingFormat:@", "];
    currentLocation = [currentLocation stringByAppendingString:placemark.country];
    [indicator stopAnimating];
    txtLocation.text = currentLocation;

}

Answer 3

我遇到了同样的问题，MKReverseGeocoder 并不总是返回完整的地址，因为有时坐标不够准确并且服务无法生成近似地址。
为了获得最佳结果，我针对雅虎实施了其他反向地理编码。所以基本上如果 MKReverseGeocoder (google) 没有返回完整的地址，我会查询 yahoo 谁可以生成一个近似的地址。

另一方面要小心 MKReverseGeocoder，它在 IOS 5 中已被弃用，他们建议使用 CLGeocoder 代替