如何阻止viewForAnnotation方法覆盖iOS中的默认用户位置蓝色信标 [英] How to stop the viewForAnnotation method from overriding the default user location blue beacon in iOS

问题描述

现在我正在使用注释填充地图视图，并显示用户的当前位置。使用viewForAnnotation方法，它会使用默认的红色引脚覆盖所有注释，但我想返回其他注释的视图，但将用户位置保留为默认的蓝色信标。有没有办法简单地做到这一点，还是我必须创建一个新的注释视图并根据注释返回正确的注释视图？

Right now I am populating a map view with annotations, and also displaying the user's current location. With the viewForAnnotation method, it overrides all annotations with the default red pin, but I want to return the views for the other annotations, but keep the user location the default blue beacon. Is there a way to do this simply or do I have to create a new annotation view and return the right one depending on the annotation?

现在我有类似的东西：

Right now I have something like:

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    if (annotation.coordinate == locationManager.location.coordinate) {

return nil;

    }else {

    MKAnnotationView *annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"Beacon"];

    // Button
    UIButton *button = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    button.frame = CGRectMake(0, 0, 23, 23);
    annotationView.rightCalloutAccessoryView = button;


    annotationView.canShowCallout = YES;

    return annotationView;
}
}

但我无法将两者等同于因为我可以不要从注释参数中获取坐标属性。

But I can't equate the two because I can't get the coordinate property out of the annotation argument.

有人知道任何解决方案吗？

Anybody know any solutions to this?

推荐答案

查看此处的文档：

http://developer.apple.com/library/ios/#documentation/MapKit/Reference/MKMapViewDelegate_Protocol/MKMapViewDelegate/MKMapViewDelegate.html

正如它所述：

如果注释中的对象参数是
MKUserLocation 类的实例，您可以提供自定义视图来表示
用户的位置。要使用默认的
系统视图显示用户的位置，请返回nil。

If the object in the annotation parameter is an instance of the MKUserLocation class, you can provide a custom view to denote the user’s location. To display the user’s location using the default system view, return nil.

因此您可以添加条件以进行检查这个：

So you can add a conditional to check for this:

if([annotation isKindOfClass: [MKUserLocation class]]) {
  return nil;
}

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