显示引脚兼容标题（注释）一次地图加载 [英] Displaying Pin with Title (annotation) once map loads

问题描述

我的工作我的第一个应用程序，并在其中我只是想有按钮单击显示用针（和标题该引脚的位置上）的地图。我能够加载的MapView，并把它显示我想要的坐标。但是，当试图显示引脚和注释我有问题。不知道从何处code这个问题以及如何使注释显示引脚。我搜索，看到很多教程，但大多数表现出不同的图形页面的风格，并显示在用户选择引脚，我想在地图上显示的负载引脚。

I am working on my first app and within it I'm just trying to have on button click show a map with a pin (and title on this pin of location). I was able to load the mapview and to have it show the coordinates I want. But when trying to display the pin and annotation I am having issues. Not sure where to code this and how to make annotation to display pin. I've searched and seen many tutorials, but most show a different mapview style and are showing pin on user selection, I want to show pin on load of map.

下面是code我必须证明这是工作的地图，但没有针显示或注释：

Here is the code I have to show the map which is working, but has no pin display or annotation:

FirstLocateViewController.m code：

FirstLocateViewController.m code:

#import "FirstLocateViewController.h"

@implementation FirstLocateViewController

@synthesize dismissViewButton;

-(IBAction)dismissView:(id)sender {
[self dismissModalViewControllerAnimated:YES];
}

- (void)viewDidLoad {
[super viewDidLoad];
CGRect frame = CGRectMake(0,0, 320,420);
mapView = [[MKMapView alloc] initWithFrame:frame];
mapView.mapType = MKMapTypeStandard;
CLLocationCoordinate2D coord = {latitude: 12.3456, longitude: -7.890};
MKCoordinateSpan span = {latitudeDelta: 0.05, longitudeDelta: 0.05};
MKCoordinateRegion region = {coord, span};
[mapView setRegion:region];
[self.view addSubview:mapView];

}

FirstLocateViewController.h code：

FirstLocateViewController.h code:

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


@interface FirstLocateViewController : UIViewController <MKMapViewDelegate> {
UIButton *dismissViewButton;
MKMapView *mapView;
}

@property (nonatomic, retain) IBOutlet UIButton *dismissViewButton;

- (IBAction)dismissViewButton:(id)sender;

@end

感谢您先进任何显著的帮助。

Thank you in advanced for any significant help.

推荐答案

对于您需要创建注释创建一个具有CLLocationCoordinate2D，标题，副标题这样一个类
.h文件中

For that you need to create annotation create one class which has CLLocationCoordinate2D,title,subtitle like this .h file

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


@interface DisplayMap : NSObject <MKAnnotation> {

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

@end

和.m文件

#import "DisplayMap.h"


@implementation DisplayMap

@synthesize coordinate,title,subtitle;


-(void)dealloc{
    [title release];
    [super dealloc];
}

@end

然后添加以下code到viewDidLoad中

and then add following code to viewdidload

DisplayMap *ann = [[DisplayMap alloc] init]; 
ann.title=@"put title here";
ann.coordinate = region.center; 
[mapView addAnnotation:ann];

和实现下面的方法

-(MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:
(id <MKAnnotation>)annotation {
    MKPinAnnotationView *pinView = nil; 
    if(annotation != mapView.userLocation) 
    {
        static NSString *defaultPinID = @"com.invasivecode.pin";
        pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
        if ( pinView == nil ) pinView = [[[MKPinAnnotationView alloc]
                                          initWithAnnotation:annotation reuseIdentifier:defaultPinID] autorelease];

        pinView.pinColor = MKPinAnnotationColorPurple; 
        pinView.canShowCallout = YES;
        pinView.animatesDrop = YES;
    } 
    else {
        [mapView.userLocation setTitle:@"I am here"];
    }
    return pinView;
}

按照此<一个href=\"http://www.edumobile.org/iphone/iphone-programming-tutorials/mapkit-example-in-iphone/\">tutorial:$c$c与给出的解释是：

Follow this tutorial:code with explanation is given:

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