Ios 不要重复添加注释

我插入了一些来自json服务器的注释，但是我想检查注释是否已经在地图上，如果已经在地图上，就不再添加它。因为它们是相互叠加的，有人帮我解决这个问题吗

我的代码：

  // adiciona produtos ao mapa
    - (void)adicionaAnnotationsNoMapa:(id)objetos{
        NSMutableArray *annotationsPins = [[NSMutableArray alloc] init];

    for (NSDictionary *annotationDeProdutos in objetos) {
        CLLocationCoordinate2D location;
        AnnotationMap *myAnn;
        myAnn = [[AnnotationMap alloc] init];
        location.latitude = [[annotationDeProdutos objectForKey:@"latitude"] floatValue];
        location.longitude = [[annotationDeProdutos objectForKey:@"longitude"] floatValue];
        myAnn.coordinate = location;
        myAnn.title = [annotationDeProdutos objectForKey:@"name"];
        myAnn.subtitle = [NSString stringWithFormat:@"R$ %@",[annotationDeProdutos objectForKey:@"price"]];
        myAnn.categoria = [NSString stringWithFormat:@"%@", [annotationDeProdutos objectForKey:@"id_categoria"]];
        myAnn.idProduto = [NSString stringWithFormat:@"%@", [annotationDeProdutos objectForKey:@"id"]];
        [annotationsPins addObject:myAnn];
    }

    [self.mapView addAnnotations:annotationsPins];
}

---

您可以遍历MkMapView上已经存在的注释，并查看它们是否已经存在：

NSArray * annotations = [self.mapView.annotations copy];
for (NSDictionary *annotationDeProdutos in objetos)
{
    // Check if annotation in annotations are duplicate of annotationDeProdutos.
    // You can match using name.
}

或者，如果只希望显示来自单个服务器调用的注释，则使用另一种方式：

[self.mapView removeAnnotations: self.mapView.annotations];
// Now add from JSON response.

---

您可以对每个批注执行此操作：

if(![self.mapView.annotations containsObject: myAnn]) {
    [self.mapView addAnnotations: myAnn];
}

---

我用这个代码解决了这个问题：

// adiciona produtos ao mapa
- (void)adicionaAnnotationsNoMapa:(id)objetos{
    NSMutableArray *annotationsPins = [[NSMutableArray alloc] init];

for (NSDictionary *annotationDeProdutos in objetos) {

    CLLocationCoordinate2D location;
    AnnotationMap *myAnn;
    myAnn = [[AnnotationMap alloc] init];
    location.latitude = [[annotationDeProdutos objectForKey:@"latitude"] floatValue];
    location.longitude = [[annotationDeProdutos objectForKey:@"longitude"] floatValue];
    myAnn.coordinate = location;
    myAnn.title = [annotationDeProdutos objectForKey:@"name"];
    myAnn.subtitle = [NSString stringWithFormat:@"R$ %@",[annotationDeProdutos objectForKey:@"price"]];
    myAnn.categoria = [NSString stringWithFormat:@"%@", [annotationDeProdutos objectForKey:@"id_categoria"]];
    myAnn.idProduto = [NSString stringWithFormat:@"%@", [annotationDeProdutos objectForKey:@"id"]];

    if (self.mapView.annotations.count <1) {
        [annotationsPins addObject:myAnn];
    } else {

        __block NSInteger foundIndex = NSNotFound;

        [annotationsPins enumerateObjectsUsingBlock:^(AnnotationMap *annotation, NSUInteger idx, BOOL *stop) {
            CLLocation *loc1 = [[CLLocation alloc] initWithLatitude:location.latitude longitude:location.longitude];
            CLLocation *loc2 = [[CLLocation alloc] initWithLatitude:annotation.coordinate.latitude longitude:annotation.coordinate.longitude];

            if ([loc1 distanceFromLocation:loc2] <= 1.0f) {
                foundIndex = idx;
                *stop = YES;
            }
        }];

        if (foundIndex != NSNotFound) {
            [annotationsPins addObject:myAnn];
        }
    }

}

[self.mapView addAnnotations:annotationsPins];

//adiciona produtos ao mapa
-（无效）adicionaAnnotationsNoMapa:（id）objetos{
NSMutableArray*annotationsPins=[[NSMutableArray alloc]init]；
for（NSDictionary*对象中的注释deProdutos）{
CLLOCATION坐标2D定位；
注释地图*myAnn；
myAnn=[[AnnotationMap alloc]init]；
location.latitude=[[annotationDeProdutos objectForKey:@“latitude”]floatValue]；
location.longitude=[[annotationDeProdutos objectForKey:@“longitude”]floatValue]；
myAnn.坐标=位置；
myAnn.title=[annotationDeProdutos objectForKey:@“name”]；
myAnn.subtitle=[NSString stringWithFormat:@“R$%@，[annotationDeProdutos objectForKey:@“price”]；
myAnn.categoria=[NSString stringWithFormat:@“%@，[annotationDeProdutos objectForKey:@“id_categoria”]；
myAnn.idProduto=[NSString stringWithFormat:@“%@，[annotationDeProdutos objectForKey:@“id”]；
如果（self.mapView.annotations.count如何检查NSArray*批注上的批注是否重复？通过这种方式，它们仍然一个放置在另一个上。这是因为它们不是同一个批注，只是位于同一位置的批注，但具有不同的对象。您可以删除地图批注，然后添加其他批注在添加新的注释之前，请编辑新闻或比较注释的位置。