如何在Mapview中使用图片和标签在iPhone中添加注释？

Question

我在我的iPhone应用程序中使用MKMapview。

如何在MKMapkit Framework的注解中分配值？

Answer 1

可以使用自定义视图每个注释与一个UIView，一个UIImageView和一个标签来显示不同的值。这将在方法- (MKAnnotationView *)mapView:(MKMapView *)newMapView viewForAnnotation:(id)newAnnotation内完成。你必须采取UIView尺寸的双倍透明颜色相对于UIImageView更准确地查看放大和缩小mapview。

代码-----

-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation 
{ 
    static NSString * const kPinAnnotationIdentifier = @"PinIdentifier"; 
    if(annotation == self._mapView.userLocation) 
    { 
     return nil; 
    } 

    MyAnnotation *myAnnotation = (MyAnnotation *)annotation; 
    MKAnnotationView *newAnnotation = (MKAnnotationView*)[self._mapView dequeueReusableAnnotationViewWithIdentifier:kPinAnnotationIdentifier]; 

    if(!newAnnotation){ 
     newAnnotation = [[MKAnnotationView alloc] initWithAnnotation:myAnnotation reuseIdentifier:@"userloc"]; 
    } 

    NSDictionary *dict=[alertInfoArray objectAtIndex:myAnnotation.ann_tag]; 
    UIView *anView=[[UIView alloc] init]; 
    anView.backgroundColor=[UIColor clearColor]; 

    UIImageView *bgImg=[[UIImageView alloc] init]; 
    bgImg.image=[UIImage imageNamed:@""]; 
    bgImg.backgroundColor=[UIColor clearColor]; 

    UIImageView *imgView=[[UIImageView alloc] init]; 
    imgView.tag=myAnnotation.ann_tag; 

    UILabel *lblName=[[UILabel alloc] init]; 
    lblName.font=[UIFont systemFontOfSize:12]; 
    lblName.textAlignment=UITextAlignmentCenter; 
    lblName.textColor=[UIColor whiteColor]; 
    lblName.backgroundColor=[UIColor clearColor]; 
    lblName.text=TEXT YOU WANT ; 

    newAnnotation.frame=CGRectMake(0, 0, 70, 212); 
    anView.frame=CGRectMake(0, 0, 70, 212); 
    bgImg.frame=CGRectMake(0, 0, 70, 106); 
    bgImg.image=[UIImage imageNamed:@"thumb-needhelp.png"]; 

    imgView.frame=CGRectMake(8,25,55,48); 
    imgView.image=[UIImage imageNamed:@"girl-default.png"]; 
    lblName.frame=CGRectMake(5,79,60,10); 



    [anView addSubview:bgImg]; 
    [bgImg release]; 
    [anView addSubview:imgView]; 
    [imgView release]; 
    [newAnnotation addSubview:anView]; 
    [anView release]; 

    newAnnotation.canShowCallout=YES; 
    [newAnnotation setEnabled:YES]; 

    return newAnnotation; 
} 

希望这有助于。

Answer 2

1. 创建一个自定义的注释类（MKAnnotation）
2. 创建自定义AnnotationView类（MKAnnotationView）

确保您在定义标题，背景图像和自定义注释的其他元素AnnotationView类作为属性。

1. 重写以下方法，并设置您在AnnotationView类中定义的属性的值。

   - (MKAnnotationView*) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{ 
   
   if ([<Object of CustomAnnotation class> isKindOfClass:[MKUserLocation class]]) 
       return nil; 
   
   CustomAnnotation* custom_anno = (CustomAnnotation*)[mapView dequeueReusableAnnotationViewWithIdentifier:@"custom_annotation"]; 
   
   if (!custom_anno){ 
   custom_anno = [[CustomAnnotation alloc] initWithAnnotation:annotation reuseIdentifier:@"custom_annotation"]; 
   custom_anno.frame = CGRectMake(0, 0, 250, 57.5); 
   
   custom_anno.canShowCallout = NO;//CHange if you want to change callout behaviour (thats is it's abilty to apper). I set it top no because i did not want a callout. 
   
   UIImageView* icon = [[UIImageView alloc] initWithFrame:CGRectMake(5, 5, 40, 40)]; 
   [icon setImageWithURL:<your image> placeholderImage:<your placeholder image>];//placeholder image = nil if you do not want one. 
   icon.backgroundColor = [UIColor lightGrayColor]; 
   
   UILabel* name = [[UILabel alloc] initWithFrame:CGRectMake(50, 5, 200, 20)]; 
   name.text = nameValue; 
   
   UILabel* category = [[UILabel alloc] initWithFrame:CGRectMake(50, 25, 200, 20)]; 
   category.text = otherValue; 
   
   [custom_anno addSubview:icon]; 
   [custom_anno addSubview:name]; 
   [custom_anno addSubview:category]; 
   } 
   return custom_anno; 
   } 
   

   我的自定义注释类是'Annotation'，自定义注释视图类是'CustomAnnotation'。根据您的需求改变。

之后，只需创建一个Annotation类的对象，并使用它。

编辑：

确保您覆盖follwing方法诠释他的自定义注解视图类：

在.H

：

- (id)initWithAnnotation:(id<MKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier; 

中的m：

- (id)initWithAnnotation:(id<MKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier{ 
self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier]; 
if (self) { 
} 
return self; 

}

编辑2：

你可以用它在你的视图控制器是这样的：

MKMapView* cellMap = [[MKMapView alloc] initWithFrame:CGRectMake(0, 0, 290, 100)]; 
cellMap.delegate = self; 
cellMap.userInteractionEnabled = NO; 

CLLocationCoordinate2D center = CLLocationCoordinate2DMake(<your coordinates>); 
MKCoordinateSpan span = MKCoordinateSpanMake(0.04, 0.04); 
MKCoordinateRegion region = MKCoordinateRegionMake(center, span); 
cellMap.showsUserLocation = NO; 
[cellMap setRegion:region animated:YES]; 

Annotation* anon = [[Annotation alloc] init]; 
anon.coordinate = center; 

[cellMap addAnnotation:anon]; 
[checkIn addSubview:cellMap];