如何在MKMapView上添加地图注释？ [英] How to add a Map annotation on MKMapView?

问题描述

嘿，我想在我的地图上添加注释。

   -  
 
 
 < （void）abreMapa：（NSString *）endereco {
 
 NSString * urlString = [NSString stringWithFormat：@http://maps.google.com/maps/geo?q=%@&output = csv，
 [endereco stringByAddingPercentEscapesUsingEncoding：NSUTF8StringEncoding]]; 
 NSString * locationString = [NSString stringWithContentsOfURL：[NSURL URLWithString：urlString]]; 
 NSArray * listItems = [locationString componentsSeparatedByString：@，]; 
 
 double latitude = 0.0; 
 double longitude = 0.0; 
 
 if（[listItems count]> = 4&& [[listItems objectAtIndex：0] isEqualToString：@200]）{
 latitude = [[listItems objectAtIndex：2 ] doubleValue]; 
 longitude = [[listItems objectAtIndex：3] doubleValue]; 
} 
 else {
 //显示错误
} 
 
 CLLocationCoordinate2D坐标; 
 coordinate.latitude = latitude; 
 coordinate.longitude = longitude; 
 myMap.region = MKCoordinateRegionMakeWithDistance（coordinate，2000，2000）; 
 
 [self.view addSubview：mapa]; 
 
 
} 
  

谢谢！

解决方案

由于MKAnnotation是一个协议，你必须定义自己的实现协议的类。例如，

  @interface SPAnnotation：NSObject< MKAnnotation> {
 CLLocationCoordinate2D coordinate; 
} 
 
 @property（nonatomic，readonly）CLLocationCoordinate2D coordinate; 
 
  - （id）initWithCoordinate：（CLLocationCoordinate2D）coordinate; 
  

如果您要映射的位置有纬度，经度：

  SPAnnotation * annotation = [[Annotation alloc] initWithCoordinate：CLLocationCoordinate2DMake（latitude，longitude）]; 
 [myMap addAnnotation：annotation]; 
  

Hey, im trying to add an annotation on my map. How can i do it?

Heres my code:

- (void)abreMapa:(NSString *)endereco {

NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=csv", 
                       [endereco stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString]];
NSArray *listItems = [locationString componentsSeparatedByString:@","];

double latitude = 0.0;
double longitude = 0.0;

if([listItems count] >= 4 && [[listItems objectAtIndex:0] isEqualToString:@"200"]) {
    latitude = [[listItems objectAtIndex:2] doubleValue];
    longitude = [[listItems objectAtIndex:3] doubleValue];
}
else {
    //Show error
}

CLLocationCoordinate2D coordinate;
coordinate.latitude = latitude;
coordinate.longitude = longitude;
myMap.region = MKCoordinateRegionMakeWithDistance(coordinate, 2000, 2000);

[self.view addSubview:mapa];


 }

Thanks!

解决方案

Since MKAnnotation is a protocol, you'll have to define your own class that implements the protocol. For example,

@interface SPAnnotation : NSObject <MKAnnotation> {
    CLLocationCoordinate2D coordinate;
}

@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;

- (id)initWithCoordinate:(CLLocationCoordinate2D)coordinate;

If you have a latitude, longitude for the location you'd like to map:

SPAnnotation *annotation = [[Annotation alloc] initWithCoordinate:CLLocationCoordinate2DMake(latitude, longitude)];
[myMap addAnnotation:annotation];

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