IOS：将图像添加到自定义MKAnnotationview [英] IOS: Adding image to custom MKAnnotationview

问题描述

我想将自定义图片添加到地图中的注释中。我做了以下自定义MapAnnotationView：

  #import< UIKit / UIKit.h> 
 #import< Foundation / Foundation.h> 
 #import< MapKit / MapKit.h> 
 #import< CoreLocation / CoreLocation.h> 
 @class POI; 
 
 @interface MapAnnotation：MKAnnotationView< MKAnnotation> 
 
 @property（非原子）CGFloat lat; 
 @property（非原子）CGFloat lon; 
 @property（非原子）CGFloat高度; 
 @property（非原子，复制）NSString * title; 
 @property（非原子，复制）NSString *副标题; 
 @property（nonatomic，retain）NSString * source; 
 @property（nonatomic，retain）UIImage * image; 
 
 @end 
 
 @implementation MapAnnotation 
 @synthesize coordinate; 
 @synthesize lat = _lat，lon = _lon，altitude = _altitude; 
 @synthesize subtitle = _subtitle，title = _title，source = _source，image = _img; 
 
 
  - （CLLocationCoordinate2D）坐标; {
 CLLocationCoordinate2D position; 
 if（_lat！= 0.0&& _lon！= 0.0）{
 position.latitude = _lat; 
 position.longitude = _lon; 
 
} else {
 position.latitude = 0.0; 
 position.longitude = 0.0; 
} 
 
返回头寸; 
} 
 
 @end 
 
  - （void）mapDataToMapAnnotations {
 
 NSMutableArray * toRemove = [NSMutableArray arrayWithCapacity：10]; 
（_map.annotations中的id注释）
 if（annotation！= _map.userLocation）
 [toRemove addObject：annotation]; 
 [_map removeAnnotations：toRemove]; 
 
 [_data removeAllObjects]; 
 
 [_data addObjectsFromArray：[UDdelegate naturArray]]; 
 
 
 if（_data！= nil）{
 MapAnnotation * tmpPlace; 
 // for（NSDictionary * poi in _data）{
 
 
 for（POI * poi in _data）{
 
 tmpPlace = [[MapAnnotation alloc ]在里面]; 
 
 tmpPlace.title = [poi title]; 
 tmpPlace.lat = [poi lat]; 
 tmpPlace.lon = [poi lon]; 
 tmpPlace.subtitle = [poi dist]; 
 tmpPlace.image = [poi poiIcon]; 
 
 [self.map addAnnotation：tmpPlace]; 
 [_map setNeedsLayout]; 
} 
} 
} 
  

问题在于引脚是标准的redPin ....我确信图标不为空，已经检查过。

谢谢

mapView：viewForAnnotation：。

   - （MKAnnotationView *）mapView：（MKMapView *）map viewForAnnotation：（id< MKAnnotation>）注释
 {
静态NSString * annotationViewReuseIdentifier = @annotationViewReuseIdentifier; 
 
 MKAnnotationView * annotationView =（MKAnnotationView *）[mapView dequeueReusableAnnotationViewWithIdentifier：annotationViewReuseIdentifier]; 
 
 if（annotationView == nil）
 {
 annotationView = [[[MKAnnotationView alloc] initWithAnnotation：annotation reuseIdentifier：annotationViewReuseIdentifier] autorelease]; 
} 
 
 annotationView.image = [UIImage imageNamed：@pin_image.png]; 
 annotationView.annotation =注解; 
 
返回annotationView; 
} 
  

为了封装更多，您应该像创建自定义注释视图一样创建并提供我们建议你重命名 MapAnnotation 类，因为它很混乱。 iOS中还有Annotations是这些注释视图的数据持有者。为了解决这个问题，我宁愿编写继承类的类型，在这个例子中，在你的自定义类的最后有 MKAnnotationView 。例如 CustomPinAnnotationView 。

I want to add a custom image to my annotations in the map. And i have made the following custom MapAnnotationView:

#import <UIKit/UIKit.h>
#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>
@class POI;

@interface MapAnnotation : MKAnnotationView <MKAnnotation >

@property (nonatomic) CGFloat lat; 
@property (nonatomic) CGFloat lon;
@property (nonatomic) CGFloat altitude; 
@property (nonatomic,  copy) NSString * title;
@property (nonatomic, copy) NSString * subtitle;
@property (nonatomic,retain) NSString *source;
@property (nonatomic,retain) UIImage  *image;

@end

@implementation MapAnnotation
@synthesize coordinate;
@synthesize lat=_lat,lon=_lon,altitude= _altitude;
@synthesize subtitle= _subtitle, title= _title, source=_source, image =_img;


- (CLLocationCoordinate2D)coordinate;{
    CLLocationCoordinate2D position;
    if (_lat != 0.0 && _lon != 0.0) {
        position.latitude = _lat;
        position.longitude = _lon;

    }else {
        position.latitude=0.0;
        position.longitude=0.0;
    }

    return position; 
}

@end

-(void) mapDataToMapAnnotations{

    NSMutableArray *toRemove = [NSMutableArray arrayWithCapacity:10];
    for (id annotation in _map.annotations)
        if (annotation != _map.userLocation)
            [toRemove addObject:annotation];
    [_map removeAnnotations:toRemove];

    [_data removeAllObjects];

    [_data addObjectsFromArray:[UDdelegate naturArray]];


    if(_data != nil){
        MapAnnotation * tmpPlace;
        //for(NSDictionary * poi in _data){


        for(POI* poi in _data){

            tmpPlace = [[MapAnnotation alloc]init];

            tmpPlace.title = [poi title];
            tmpPlace.lat = [poi lat];
            tmpPlace.lon = [poi lon];
            tmpPlace.subtitle = [poi dist];
            tmpPlace.image = [poi poiIcon];

            [self.map addAnnotation:tmpPlace];
            [_map setNeedsLayout];
        }
    }
}

The problem is that the pins is the standard redPin.... I am sure that the icons isn't null, have checked for that.

Thanks

解决方案

You have to serve the MapKit delegate method mapView:viewForAnnotation: with a custom view.

- (MKAnnotationView *)mapView:(MKMapView *)map viewForAnnotation:(id <MKAnnotation>)annotation
{
    static NSString *annotationViewReuseIdentifier = @"annotationViewReuseIdentifier";

    MKAnnotationView *annotationView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:annotationViewReuseIdentifier];

    if (annotationView == nil)
    {
        annotationView = [[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:annotationViewReuseIdentifier] autorelease];
    }

    annotationView.image = [UIImage imageNamed:@"pin_image.png"];
    annotationView.annotation = annotation;

    return annotationView;
}

To encapsulate more you should create a custom annotation view like you did and serve the delegate method above with your class.

I advise you to rename the MapAnnotation class because it is confusing. There are also Annotations in iOS which are the data holders for those annotation views. To solve this I would prefer to write the type of the inherited class, in this case MKAnnotationView at the end of your custom class. For example CustomPinAnnotationView.

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