如何将"地图"应用链接添加到我的每个地图注释中

Question

有一些关于此的教程和问题,但我还不够了解如何将它们实现到我的特定应用程序中.我从URL获取JSON注释数据并解析它并在for循环中添加每个注释.我想在每个注释上添加一个链接,以打开地图的方向.

这是我的ViewController.H

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

//MAP Setup
@interface ViewController : UIViewController <MKMapViewDelegate>

//map setup
@property (weak, nonatomic) IBOutlet MKMapView *mapView;
@property (nonatomic, strong) NSMutableData *downloadData;
//- (IBAction)refreshTapped:(id)sender;


@end

和我的ViewController.m

- (void)viewDidLoad
{
    ////////////////////////
    //Connection to download JSON map info
    ////////////////////////
    self.downloadData = [NSMutableData new];

    NSURL *requestURL2 = [NSURL URLWithString:@"http:OMITTED"];
    NSURLRequest *request = [NSURLRequest requestWithURL:requestURL2];
    NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate:self];

    //scroller
    [scroller setScrollEnabled:YES];
    [scroller setContentSize:CGSizeMake(320,900)];

    [super viewDidLoad];    

//Map
    [self.mapView.userLocation addObserver:self
                                forKeyPath:@"location"
                                   options:(NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld)
                                   context:nil];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    [self.downloadData appendData:data];

}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection {

    id parsed = [NSJSONSerialization JSONObjectWithData:_downloadData options:kNilOptions error:nil];

    ////////////////////////
    //Iterating and adding annotations
    ////////////////////////
    for (NSDictionary *pointInfo in parsed)
    {
        NSLog([pointInfo objectForKey:@"name"]);
        double xCoord = [(NSNumber*)[pointInfo objectForKey:@"lat"] doubleValue];
        double yCoord = [(NSNumber*)[pointInfo objectForKey:@"lon"] doubleValue];
        CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(xCoord, yCoord);


        MKPointAnnotation *point = [MKPointAnnotation new];
        point.coordinate = coords;
        point.title = [pointInfo objectForKey:@"name"];

        [self.mapView addAnnotation:point];// or whatever your map view's variable name is
    }
}

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

//centers map on user loc and then allows for movement of map without re-centering on userlocation check.
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
    if ([self.mapView showsUserLocation])
    {
        MKCoordinateRegion region;
        region.center = self.mapView.userLocation.coordinate;

        MKCoordinateSpan span;
        span.latitudeDelta  = .50; // Change these values to change the zoom
        span.longitudeDelta = .50;
        region.span = span;

        [self.mapView setRegion:region animated:YES];

        self.mapView.showsUserLocation = NO;}
}

- (void)dealloc
{
    [self.mapView.userLocation removeObserver:self forKeyPath:@"location"];
    [self.mapView removeFromSuperview]; // release crashes app
    self.mapView = nil;
}

@end

Answer 1

启动地图应用的的位置感知编程指南说:

如果您希望在地图应用中显示地图信息而不是自己的应用,则可以使用以下两种技术之一以编程方式启动地图:

在iOS 6及更高版本中,使用MKMapItem对象打开地图.
在iOS 5及更早版本中,创建并打开特殊格式的地图URL,如Apple URL Scheme Reference中所述.
打开地图应用的首选方法是使用MKMapItem该类.此类提供用于打开应用程序和显示位置或方向的openMapsWithItems:launchOptions:类方法和openInMapsWithLaunchOptions:实例方法.

有关如何打开地图应用的示例,请参阅"要求地图应用显示路线".

所以,你应该:

1. 确保将视图控制器定义delegate为地图视图;

2. 写一个viewForAnnotation打开canShowCallout并打开标注附件视图:

   - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
   {
       if ([annotation isKindOfClass:[MKUserLocation class]])
           return nil;
   
       MKAnnotationView* annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation
                                                                       reuseIdentifier:@"MyCustomAnnotation"];
   
       annotationView.canShowCallout = YES;
       annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
   
       return annotationView;
   }
   

3. 然后calloutAccessoryControlTapped根据您支持的iOS版本编写一个打开上述地图的方法,例如,针对iOS 6:

   - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
   {
       id <MKAnnotation> annotation = view.annotation;
       CLLocationCoordinate2D coordinate = [annotation coordinate];
       MKPlacemark *placemark = [[MKPlacemark alloc] initWithCoordinate:coordinate addressDictionary:nil];
       MKMapItem *mapitem = [[MKMapItem alloc] initWithPlacemark:placemark];
       mapitem.name = annotation.title;
       [mapitem openInMapsWithLaunchOptions:nil];
   }
   

   我不知道你的KML中有哪些额外的地理信息,但你可以addressDictionary根据自己的意愿填写.

在回答有关如何使用您的后续问题addressDictionary的参数MKPlacemark初始化方法,initWithCoordinate如果您有NSString在街上变量address中,city中,state中,zip等等,它看起来像:

NSDictionary *addressDictionary = @{(NSString *)kABPersonAddressStreetKey : street,
                                    (NSString *)kABPersonAddressCityKey   : city,
                                    (NSString *)kABPersonAddressStateKey  : state,
                                    (NSString *)kABPersonAddressZIPKey    : zip};

对于这个工作,你必须在适当的框架中添加,AddressBook.framework以你的项目,并在您的.m文件导入头:

#import <AddressBook/AddressBook.h>

然而,真正的问题是如何设置它name,MKMapItem因此它不会在地图应用程序中显示为"未知位置".这就像设置name属性一样简单,可能只是抓住title你的annotation:

mapitem.name = annotation.title;