如何向MKAnnotation添加公开按钮？

Question

我想向MKAnnotation添加一个公开按钮以转到另一个视图。

按钮应如下所示：

Image

这是我的 .h 和 .m 文件。

---

.h文件

//
//  POI.h
//

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

@interface POI : NSObject <MKAnnotation> {

    NSString *title;
    NSString *subtitle;
    CLLocationCoordinate2D coordinate;
}

@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *subtitle;
@property (nonatomic, assign) CLLocationCoordinate2D coordinate;

- (id)initWithCoordinate:(CLLocationCoordinate2D)_coordinate title:(NSString *)_titolo andSubTitle:(NSString *)_sottotitolo;


@end

---

.m文件

//
//  POI.m

#import "POI.h"



@implementation POI

@synthesize title, subtitle, coordinate;
-(id)initWithCoordinate:(CLLocationCoordinate2D)_coordinate title:(NSString *)_titolo andSubTitle:(NSString *)_sottotitolo {

    [self setTitle:_titolo];
    [self setSubtitle:_sottotitolo];
    [self setCoordinate:_coordinate];



    return self;
}

@end

在我的ViewController中我使用：

调用它

  pinLocation.latitude = 4.8874;
    pinLocation.longitude = 1.400;
    POI *poi = [[POI alloc] initWithCoordinate:pinLocation title:@"foo" andSubTitle:@"bar"];
    [_mapView addAnnotation:poi];

Answer 1

三个步骤。

1）在头文件（.h）或中，您的实现文件（.m）类扩展符合MKMapViewDelegate：

@interface ViewController : UIViewController <MKMapViewDelegate> { ... } 

2）将视图控制器设置为MKMapViewDelegate的委托，以接收委托回调。通常在viewDidLoad中完成：

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.mapView.delegate = self;
}

3）实现以下委托功能以显示披露按钮：

- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation
{   
    MKPinAnnotationView *newAnnotation = [[MKPinAnnotationView alloc]     initWithAnnotation:annotation reuseIdentifier:@"pinLocation"];

    newAnnotation.canShowCallout = YES;
    newAnnotation.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

    return newAnnotation;
}

以下功能将有助于确定在触摸公开按钮时采取的操作（在您的情况下，呈现视图）。

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    //launch a new view upon touching the disclosure indicator
    TestVCViewController *tvc = [[TestVCViewController alloc] initWithNibName:@"TestVCViewController" bundle:nil];
    [self presentViewController:tvc animated:YES completion:nil];
}

Answer 2

在您的- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation方法中使用此：

annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

其中annotationView是要返回的视图。