これに関するいくつかのチュートリアルと質問がありますが、特定のアプリにそれらを実装する方法を理解するにはまだ十分な知識がありません. URL から JSON 注釈データを取得して解析し、各注釈を for ループに追加します。各注釈にリンクを追加して、マップを開いてルートを表示したいと考えています。
これが私のViewController.Hです
#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
そして私の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