Question

这应该很容易弄清楚我认为...... 我有一个工作的mapview，它将一系列带编号的pin标记放到地图上。我正在从一个plist调用该引脚的图像，然而，当引脚掉落时，它们都具有与最后一个引脚相同的数字。（而不是1,2,3 ..）

违规代码如下，我只是不确定如何解决它...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），当前注释视图以最后一个点的图像结束。 annotationView对象在该循环内没有改变。

我假设第二个循环和最后一行在viewForAnnotation方法中。

不是循环遍历所有点，而应仅从当前注释对象获取routeDict，并将annotationView的图像设置一次。

假设您在AllAnnotations类中添加了routeDict作为属性，您可以执行以下操作：

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];

<小时/> 修改
根据您的问题和评论中的更新代码，以下是您需要进行的更改。

在AllAnnotations.h中，添加一个ivar来存储注释的图像文件名：

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

在AllAnnotations.m中，为新的ivar添加合成并更新initWithDictionary和dealloc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，您可以在注释中存储POINT_KEY和COLOR_KEY对象的值，并在viewForAnnotation方法中生成文件名。

顺便说一下，“AllAnnotations”不是这个代表单个注释的类的好名字。也许“RouteAnnotation”会更好。

最后，viewForAnnotation方法应如下所示：

- (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; }

mapkit多点显示不同的图像

1 个答案: