ios - 当点击注释时用户位置的脉冲将显示警报

Question

我已经能够通过使用 https://github.com/TransitApp/SVPulsingAnnotationView 来增加用户位置注释的半径
现在，如果我在 map 上放置一个自定义注释，并且如果这个脉冲命中那个符号，我想显示一些东西，比如一个 AlertView。 我该怎么做？以下是我更改默认 userLocation 注释的方法。

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

    if (annotation==(mapView.userLocation)) {

    static NSString *identifier = @"currentLocation";
    SVPulsingAnnotationView *pulsingView = (SVPulsingAnnotationView *)[self.mapView dequeueReusableAnnotationViewWithIdentifier:identifier];

    if(pulsingView == nil) {
        pulsingView = [[SVPulsingAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
        pulsingView.pulseScaleFactor= 40.0;//Change pulseScaleFactor as required
        pulsingView.outerPulseAnimationDuration = 1.5;
        pulsingView.canShowCallout = YES;
        pulsingView.centerOffset = CGPointMake(0, 250);
    }

    return pulsingView;

    }
    else return nil;
}

Answer 1

尝试将地理围栏添加到该注释，并为脉冲注释指定半径。

    NSString *title = "annotationTitle";
    CLLocationCoordinate2D centerCoordinate = CLLocationCoordinate2DMake(annotationLatitude, annotationLongitude);
    CLLocationDistance regionRadius = [@"radius" doubleValue]; // Here radius is in meters, say @"500"
    CLCircularRegion *geofence = [[CLCircularRegion alloc] initWithCenter:centerCoordinate radius:regionRadius identifier:title];

    [_locationManager startMonitoringForRegion:geofence];

当您的位置/脉冲注释进入该注释的指定半径时，将触发两个重要的方法。

    //triggers when entering in region
        - (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region{

            UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Your Title" message:@"YourMessage" delegate:APP_DELEGATE cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [message show];
        }

    //triggers when exiting from region
        - (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region {
            UIAlertView *message = [[UIAlertView alloc] initWithTitle:@"Your Title" message:@"YourMessage" delegate:APP_DELEGATE cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [message show];
        }

这看起来就像脉冲命中注释然后触发警报。

希望这对您有所帮助。