因此,在我的应用程序中,我有一个 mapView,当屏幕被按下时,它会掉落针脚。一旦注释被删除,它们就会被放入一个数组中。地图上一次会有多个图钉,每个图钉都有一个标识符属性,即 NSNumber。当按下 annotationView 上的标注按钮时,我有另一个视图控制器被推送到堆栈上,并且该视图有一个按钮,我想在按下时从 mapView 中删除 pin。我的问题是,我不知道如何将引脚的标识符传递给第二个视图控制器。这是一些代码。
这是我放下别针的方法:
-(void)press:(UILongPressGestureRecognizer *)recognizer
{
CGPoint touchPoint = [recognizer locationInView:_worldView];
CLLocationCoordinate2D touchMapCoordinate = [_worldView convertPoint:touchPoint toCoordinateFromView:_worldView];
geocoder = [[CLGeocoder alloc]init];
CLLocation *location = [[CLLocation alloc]initWithCoordinate:touchMapCoordinate
altitude:CLLocationDistanceMax
horizontalAccuracy:kCLLocationAccuracyBest
verticalAccuracy:kCLLocationAccuracyBest
timestamp:[NSDate date]];
[geocoder reverseGeocodeLocation:location
completionHandler:^(NSArray *placemarks, NSError *error) {
NSLog(@"reverseGeocoder:completionHandler: called");
if (error) {
NSLog(@"Geocoder failed with error: %@", error);
} else {
CLPlacemark *place = [placemarks objectAtIndex:0];
geocodedAddress = [NSString stringWithFormat:@"%@ %@, %@ %@", [place subThoroughfare], [place thoroughfare], [place locality], [place administrativeArea]];
if (UIGestureRecognizerStateBegan == [recognizer state]) {
value = [number intValue];
number = [NSNumber numberWithInt:value + 1];
addressPin = [[MapPoint alloc]initWithAddress:geocodedAddress coordinate:touchMapCoordinate
title:geocodedAddress identifier:number];
NSLog(@"The identifier is %@", number);
[_annotationArray addObject:addressPin];
[_worldView addAnnotation:addressPin];
NSLog(@"The number of pins in the annotation array is: %u",_annotationArray.count);
}
}
}];
}
这是我创建第二个视图控制器的地方:
-(void)mapView:(MKMapView *)mapView
annotationView:(MKAnnotationView *)view
calloutAccessoryControlTapped:(UIControl *)control
{
PinViewController *pinViewController = [[PinViewController alloc]init];
[[self navigationController]pushViewController:pinViewController animated:YES];
pinViewController.label.text = view.annotation.title;
}
这是我的 MKAnnotation 类:
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>
@interface MapPoint : NSObject <MKAnnotation>
{
NSString *_address;
CLLocationCoordinate2D _coordinate;
NSNumber *_identifier;
}
- (id)initWithAddress:(NSString*)address
coordinate:(CLLocationCoordinate2D)coordinate
title:(NSString *)t
identifier:(NSNumber *)ident;
//This is a required property from MKAnnotation
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
//This is an optional property from MKAnnotataion
@property (nonatomic, copy) NSString *title;
@property (nonatomic, readonly, copy) NSString *subtitle;
@property (nonatomic) BOOL animatesDrop;
@property (nonatomic) BOOL canShowCallout;
@property (copy) NSString *address;
@property (copy, nonatomic) NSNumber *identifier;
@end
#import "MapPoint.h"
@implementation MapPoint
@synthesize title, subtitle, animatesDrop, canShowCallout;
@synthesize address = _address, coordinate = _coordinate, identifier = _identifier;
-(id)initWithAddress:(NSString *)address
coordinate:(CLLocationCoordinate2D)coordinate
title:(NSString *)t
identifier:(NSNumber *)ident
{
self = [super init];
if (self) {
_address = [address copy];
_coordinate = coordinate;
_identifier = ident;
[self setTitle:t];
NSDate *theDate = [NSDate date];
subtitle = [NSDateFormatter localizedStringFromDate:theDate
dateStyle:NSDateFormatterMediumStyle
timeStyle:NSDateFormatterMediumStyle];
}
return self;
}
@end