Iphone 使用Plist数据在地图上显示多个管脚

我试图使用一系列字典中的纬度和经度在地图上显示多个PIN。问题是它总是只显示plist中最后一个字典的pin

以下是我的方法：

- (void)loadMapPins
{
MapAnnotation *annotation = [[MapAnnotation alloc] init];

for (int i=0; i<self.dataDictionary.count; i++){

    NSDictionary *dictionary = [NSDictionary dictionaryWithDictionary:[self.dataDictionary objectAtIndex:i]];

    double latitude = [[dictionary objectForKey:@"Latitude"] doubleValue];
    double longitude = [[dictionary objectForKey:@"Longitude"] doubleValue];

    CLLocationCoordinate2D coord = {.latitude =
        latitude, .longitude =  longitude};
    MKCoordinateRegion region = {coord};

    annotation.title = [dictionary objectForKey:@"Name"];
    annotation.subtitle = [dictionary objectForKey:@"Center Type"];
    annotation.coordinate = region.center;
    [mapView addAnnotation:annotation];
    }
}

-（无效）loadMapPins
{
MapAnnotation*annotation=[[MapAnnotation alloc]init]；
对于（int i=0；i我认为您希望将注释创建移动到循环中。从外观上看，您只创建了一个注释，然后在循环中反复对其进行变异。循环完成后，对注释变量的最后一次修改反映了您正在迭代的
self.dataDictionary
中的最后一项

下面的代码在每个循环迭代中创建一个新的注释对象

- (void)loadMapPins
{

    for (int i=0; i<self.dataDictionary.count; i++){

    NSDictionary *dictionary = [NSDictionary dictionaryWithDictionary:[self.dataDictionary objectAtIndex:i]];

    double latitude = [[dictionary objectForKey:@"Latitude"] doubleValue];
    double longitude = [[dictionary objectForKey:@"Longitude"] doubleValue];

    CLLocationCoordinate2D coord = {.latitude =
        latitude, .longitude =  longitude};
    MKCoordinateRegion region = {coord};

    MapAnnotation *annotation = [[MapAnnotation alloc] init];
    annotation.title = [dictionary objectForKey:@"Name"];
    annotation.subtitle = [dictionary objectForKey:@"Center Type"];
    annotation.coordinate = region.center;
    [mapView addAnnotation:annotation];
    }
}

-（无效）loadMapPins
{
对于（int i=0；就是这样！你知道有没有一种方法可以重用注释，就像我们在tableView中重用单元格一样？