我试图在地图视图上放置多个图钉但出现错误

Posted 2023-03-12

【中文标题】我试图在地图视图上放置多个图钉但出现错误

【英文标题】：I am trying to drop multiple pins on a map view but getting error

【发布时间】：2012-06-27 07:26:27

【问题描述】：

for (int i = 0; i < self.businessArray.count; i++) 
        Business *business = [self.businessArray objectAtIndex:i];
        MapAnnotation *mapAnnotation = [[MapAnnotation alloc] init]; 
        NSLog(@"%f %f", business.coordinate.latitude, business.coordinate.longitude);
        mapAnnotation.title = business.name;
        mapAnnotation.subtitle = business.address1;
        mapAnnotation.coordinate = business.coordinate;
        [bMapView addAnnotation:mapAnnotation];
        NSLog(@"ti %@", mapAnnotation.title);
        NSLog(@"sub %@", mapAnnotation.subtitle);
        NSLog(@"coo %f %f", mapAnnotation.coordinate.latitude, mapAnnotation.coordinate.longitude);
    

- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation

    MKPinAnnotationView *pinView;

    if (annotation != mapView.userLocation) 
        static NSString *defauleID = @"myLocation";
        //        pinView = (MKPinAnnotationView*)[mapView dequeueReusableAnnotationViewWithIdentifier:defauleID];
        if (pinView == nil) 
            pinView = [[MKPinAnnotationView alloc] initWithAnnotation: annotation reuseIdentifier:defauleID];
        
        pinView.pinColor = MKPinAnnotationColorGreen;
        pinView.canShowCallout = YES;
        pinView.animatesDrop = YES;

        UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        [rightButton setTitle:annotation.title forState:UIControlStateNormal];
        [rightButton addTarget:self 
                        action:@selector(showDetails:) forControlEvents:UIControlEventTouchUpInside];
        pinView.rightCalloutAccessoryView = rightButton;
    

    return pinView;

错误： MapAnnotation 类的实例 0x1cdd97b0 已被释放，而键值观察者仍向其注册。观察信息被泄露，甚至可能被错误地附加到其他对象上。在 NSKVODeallocateBreak 上设置断点以在调试器中停止。这是当前的观察信息： ( 上下文：0x0，属性：0x1cd97a30>

【参考方案1】：

每次在循环内释放注解

    for (int i = 0; i < self.businessArray.count; i++) 
            Business *business = [self.businessArray objectAtIndex:i];
            MapAnnotation *mapAnnotation = [[MapAnnotation alloc] init]; 
            NSLog(@"%f %f", business.coordinate.latitude, business.coordinate.longitude);
            mapAnnotation.title = business.name;
            mapAnnotation.subtitle = business.address1;
            mapAnnotation.coordinate = business.coordinate;
            NSLog(@"ti %@", mapAnnotation.title);
            NSLog(@"sub %@", mapAnnotation.subtitle);
            NSLog(@"coo %f %f", mapAnnotation.coordinate.latitude, mapAnnotation.coordinate.longitude);
            [bMapView addAnnotation:mapAnnotation];
            [mapAnnotation release];
        

【讨论】：

我使用 ARC。但是，我使用 [bMapView mapAnnotations: arrayOfAnnotations];

解决了它

【参考方案2】：

我认为您已通过添加观察者收到通知.. 当您收到该通知并执行与该观察者相关联的函数时释放您的 MapAnnotation 但您没有删除该观察者请在 dealloc 中删除观察者...

 [[NSNotificationCenter defaultSenter] removeObserver:self];

希望对你有帮助..