如何在地图视图中将标注添加到单个注释中

Question

我正在尝试为每个注释设置不同的标注详细信息。

目前，当我单击任何注释位置时，它会显示所有标注信息。

#import "AnnotationViewController.h"
#import "Annotation.h"

@implementation AnnotationViewController
@synthesize mapView;

-(void)viewDidLoad {

    [super viewDidLoad];
    [mapView setMapType:MKMapTypeStandard];
    [mapView setZoomEnabled:YES];
    [mapView setScrollEnabled:YES];
    [mapView setDelegate:self];

    MKCoordinateRegion TT = { {0.0, 0.0} , {0.0, 0.0} };
    TT.center.latitude = 43.65343;
    TT.center.longitude = -79.396311;
    TT.span.longitudeDelta = 0.02f;
    TT.span.latitudeDelta = 0.02f;
    [mapView setRegion:TT animated:YES];

    Annotation *ann1 = [[Annotation alloc] init];
    ann1.title = @"Annotation 01";
    ann1.subtitle = @"Message 01";
    ann1.coordinate = TT.center;
    [mapView addAnnotation:ann1];

    MKCoordinateRegion TTY = { {0.0, 0.0} , {0.0, 0.0} };
    TTY.center.latitude = 43.76919;
    TTY.center.longitude = -79.41245;
    TTY.span.longitudeDelta = 0.02f;
    TTY.span.latitudeDelta = 0.02f;
    [mapView setRegion:TTY animated:YES];

    Annotation *ann2 = [[Annotation alloc] init];
    ann2.title = @"Annotation 02";
    ann2.subtitle = @"Message 02";
    ann2.coordinate = TTY.center;
    [mapView addAnnotation:ann2];

}


-(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:id<MKAnnotation>)annotation
{
    MKPinAnnotationView *view = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pin"];
    view.pinColor = MKPinAnnotationColorPurple;
    view.enabled = YES;
    view.animatesDrop = YES;
    view.canShowCallout = YES;

    UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"GPSicon.png"]];
    view.leftCalloutAccessoryView = imageView;
    view.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

    return view;

}

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    NSString *msg = [@"Location 01" stringByAppendingFormat:@"Opening 01"];
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Plaza 01" message:msg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];

    NSString *msg02 = [@"Location 02" stringByAppendingFormat:@"Opening 02"];
    UIAlertView *alert02 = [[UIAlertView alloc] initWithTitle:@"Plaza 02" message:msg02 delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert02 show];

}


-(void)button:(id)sender {

    NSLog(@"Button action");

}

- (void)dealloc
{

}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

/*
 // Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
 - (void)viewDidLoad
 {
 [super viewDidLoad];
 }
 */

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

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

end

所以这就是发生的事情：当我点击“Annotation 01”时，会出现气泡。但是当我点击标注“详细图标”时，它会弹出位置 01 和位置 2 标题。

---

感谢安娜的帮助。但是当我检查一个注释时，我仍然得到 2 个标注。这是现在的代码..

#import "AnnotationViewController.h"
#import "Annotation.h"

@implementation AnnotationViewController
@synthesize mapView;

-(void)viewDidLoad {

[super viewDidLoad];
[mapView setMapType:MKMapTypeStandard];
[mapView setZoomEnabled:YES];
[mapView setScrollEnabled:YES];
[mapView setDelegate:self];

MKCoordinateRegion TT = { {0.0, 0.0} , {0.0, 0.0} };
TT.center.latitude = 43.65343;
TT.center.longitude = -79.396311;
TT.span.longitudeDelta = 0.02f;
TT.span.latitudeDelta = 0.02f;
[mapView setRegion:TT animated:YES];

Annotation *ann1 = [[Annotation alloc] init];
ann1.title = @"Annotation 01";
ann1.subtitle = @"Message 01";
ann1.coordinate = TT.center;
[mapView addAnnotation:ann1];

MKCoordinateRegion TTY = { {0.0, 0.0} , {0.0, 0.0} };
TTY.center.latitude = 43.76919;
TTY.center.longitude = -79.41245;
TTY.span.longitudeDelta = 0.02f;
TTY.span.latitudeDelta = 0.02f;
[mapView setRegion:TTY animated:YES];

Annotation *ann2 = [[Annotation alloc] init];
ann2.title = @"Annotation 02";
ann2.subtitle = @"Message 02";
ann2.coordinate = TTY.center;
[mapView addAnnotation:ann2];

}


-(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:id<MKAnnotation>)annotation
{
MKPinAnnotationView *view = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pin"];
view.pinColor = MKPinAnnotationColorPurple;
view.enabled = YES;
view.animatesDrop = YES;
view.canShowCallout = YES;

UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"GPSicon.png"]];
view.leftCalloutAccessoryView = imageView;
view.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];

return view;

}

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
//first make sure the annotation is our custom class...
if ([view.annotation isKindOfClass:[Annotation class]])
{
    //cast the object to our custom class...
    Annotation *ann1 = (Annotation *)view.annotation;

    //show one alert view with title set to annotation's title
    //and message set to annotation's subtitle...
    UIAlertView *alert = [[UIAlertView alloc] 
                             initWithTitle:ann1.title 
                             message:ann1.subtitle 
                             delegate:self 
                             cancelButtonTitle:@"OK" 
                             otherButtonTitles:nil];

    [alert show];
}
    //first make sure the annotation is our custom class...
if ([view.annotation isKindOfClass:[Annotation class]])
{
    //cast the object to our custom class...
    Annotation *ann2 = (Annotation *)view.annotation;

    //show one alert view with title set to annotation's title
    //and message set to annotation's subtitle...
    UIAlertView *alert2 = [[UIAlertView alloc] 
                             initWithTitle:ann2.title 
                             message:ann2.subtitle 
                             delegate:self 
                             cancelButtonTitle:@"OK" 
                             otherButtonTitles:nil];

    [alert show];
}
}


-(void)button:(id)sender {

NSLog(@"Button action");

}

- (void)dealloc
{

}

- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
}
*/

- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}

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

end

我的 Annotation.m 文件代码

#import "Annotation.h"


@implementation Annotation
@synthesize coordinate, title, subtitle;

-(void)dealloc {


}

@end

我的 Annotation.h 文件代码

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


@interface Annotation : NSObject <MKAnnotation> {

CLLocationCoordinate2D coordinate;
NSString *title;
NSString *subtitle;

}

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

@end

我是否必须为每个注释制作大量 h/m 文件才能使标注不同？我只是在这一点上跺脚。任何猜测都会很棒，谢谢！

Answer 1

在calloutAccessoryControlTapped 中，代码显示两个警报视图，其中一个接一个地显示标题和消息的硬编码文本。显然，这就是你得到的。

在calloutAccessoryControlTapped 方法中，可以通过view.annotation 获得点击了标注按钮的注释对象。

view 参数是MKAnnotationView，它有一个annotation 属性指向其相关的注解。

因此更改代码以仅显示一个警报视图，并根据注释对象的属性显示标题和消息。

检查注释的类以确保它是您期望的注释类型也是一个好主意。

例如：

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
{
    //first make sure the annotation is our custom class...
    if ([view.annotation isKindOfClass:[Annotation class]])
    {
        //cast the object to our custom class...
        Annotation *ann = (Annotation *)view.annotation;

        //show one alert view with title set to annotation's title
        //and message set to annotation's subtitle...
        UIAlertView *alert = [[UIAlertView alloc] 
                                 initWithTitle:ann.title 
                                 message:ann.subtitle 
                                 delegate:self 
                                 cancelButtonTitle:@"OK" 
                                 otherButtonTitles:nil];

        [alert show];
    }
}