mapkit多点显示不同的图像

Question

这应该是相当容易弄清楚我认为... 我有一个工作mapview，它将一系列编号引脚标记放到地图上。我打电话给plist的pin图像，但是，当引脚掉落时，它们的数量都与最后一个引脚的数量相同。 （而不是1,2,3 ..）

有问题的代码在下面，我只是不知道如何解决它...谢谢。

NSString *path = [[NSBundle mainBundle] pathForResource:[route objectForKey:NAME_KEY] ofType:@"plist"]; 
NSMutableArray* array = [[NSMutableArray alloc] initWithContentsOfFile:path]; 
points = array; 

for (NSDictionary *routeDict in points){ 
AllAnnotations *Annotation = [[AllAnnotations alloc] initWithDictionary:routeDict]; 
[mapView addAnnotation:Annotation]; 
[Annotation release]; 
} 



    for (NSDictionary *routeDict in points){ 
    NSString *first = [routeDict objectForKey: POINT_KEY]; 
    NSString *getNum = [routeDict objectForKey: COLOR_KEY]; 
    NSString *again = [getNum stringByAppendingString:first]; 
    NSString *imgValue = [again stringByAppendingString:@".png"]; 
    annotationView.image = [UIImage imageNamed:imgValue]; 
    } 

    annotationView.canShowCallout = YES; 

AllAnnotations.m 
------------------------------------------------------------------------------------------ 
- (id) initWithDictionary:(NSDictionary *) dict 
{ 
    self = [super init]; 
    if (self != nil) { 
     coordinate.latitude = [[dict objectForKey:@"latitude"] doubleValue]; 
     coordinate.longitude = [[dict objectForKey:@"longitude"] doubleValue]; 
     self.title = [dict objectForKey:@"name"]; 
     self.subtitle = [dict objectForKey:@"subname"]; 

    } 
    return self; 
} 

Answer 1

第二个循环遍历所有点（注释），当前注释视图以图像为最后一点结束。 annotationView对象在该循环内部没有更改。

我假设第二个循环和最后一行都在viewForAnnotation方法中。

除了循环遍历所有点，您应该只从当前注释对象获取routeDict，并设置annotationView的图像一次。

假设你已经添加routeDict作为AllAnnotations类的属性，你会做这样的事情：

NSDictionary *routeDict = ((AllAnnotations *)annotation).routeDict; 
NSString *first = [routeDict objectForKey: POINT_KEY]; 
NSString *getNum = [routeDict objectForKey: COLOR_KEY]; 
NSString *again = [getNum stringByAppendingString:first]; 
NSString *imgValue = [again stringByAppendingString:@".png"]; 
annotationView.image = [UIImage imageNamed:imgValue]; 

---

编辑：
根据您的问题和评论更新的代码，这里是你需要做的改变。

在AllAnnotations.h，添加伊娃保存图像文件名注释：

@interface AllAnnotations : NSObject <MKAnnotation> { 
    //existing ivars here 
    NSString *imageFileName; 
} 
//existing properties here 
@property (copy) NSString *imageFileName; 
//existing method headers here 
@end 

在AllAnnotations.m，添加合成为新的伊娃和更新initWithDictionary和dealloc的方法：

@synthesize imageFileName; 

- (id) initWithDictionary:(NSDictionary *) dict 
{ 
    self = [super init]; 
    if (self != nil) { 
     coordinate.latitude = [[dict objectForKey:@"latitude"] doubleValue]; 
     coordinate.longitude = [[dict objectForKey:@"longitude"] doubleValue]; 
     self.title = [dict objectForKey:@"name"]; 
     self.subtitle = [dict objectForKey:@"subname"]; 

     //set this annotation's image file name... 
     NSString *first = [dict objectForKey: POINT_KEY]; 
     NSString *getNum = [dict objectForKey: COLOR_KEY]; 
     NSString *again = [getNum stringByAppendingString:first]; 
     self.imageFileName = [again stringByAppendingString:@".png"]; 
    } 
    return self; 
} 

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

或者，您可以将POINT_KEY和COLOR_KEY对象的值存储在注释中，并在viewForAnnotation方法中生成文件名。

顺便说一句，“AllAnnotations”并不是这个类的好名字，它代表了单个注释。也许“RouteAnnotation”会更好。

最后，viewForAnnotation方法应该是这样的：

- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation 
{ 
    MKAnnotationView * annotationView = (MKAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"annot"]; 
    if (!annotationView) { 
     annotationView = [[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"annot"] autorelease]; 
     annotationView.canShowCallout = YES; 
    } 
    else { 
     annotationView.annotation = annotation; 
    } 

    AllAnnotations *routeAnnotation = (AllAnnotations *)annotation; 
    annotationView.image = [UIImage imageNamed:routeAnnotation.imageFileName]; 

    return annotationView; 
}