如何在加载地图时直接显示多个注释的标题 [英] How to display title for multiple annotations directly when map loaded

问题描述

我正在将多个注释加载到我的地图视图中。加载地图时，这些注释显示为图钉。

I am loading Multiple annotations onto my map view. These annotations displays as a pin when the map is loaded.

通过使用以下代码，我可以直接显示一个注释的标题，但对于剩余的注释，用户需要点击在要查看标题的引脚上。

By using the below code i can display title directly for one annotation, but for remaining annotations user is required to tap on the pin for title to see.

我想在没有触及注释引脚的情况下显示Mapview加载时所有注释的标题

I want to display the title for all the annotations when the Mapview Loaded without touching the annotation pin

NSMutableArray * locations = [[NSMutableArray alloc] init];

_myAnn = [[MKPointAnnotation alloc] init];
_locationCoordinate.latitude = 27.175015;
_locationCoordinate.longitude = 78.042155;
_myAnn.coordinate = _locationCoordinate;
_myAnn.title = @"A";
[locations addObject:_myAnn];

_myAnn = [[MKPointAnnotation alloc] init];
_locationCoordinate.latitude = 28.171391;
_locationCoordinate.longitude = 79.037090;
_myAnn.coordinate = _locationCoordinate;
_myAnn.title = @"B";
[locations addObject:_myAnn];

_myAnn = [[MKPointAnnotation alloc] init];
_locationCoordinate.latitude = 29.169005;
_locationCoordinate.longitude = 80.043206;
_myAnn.coordinate = _locationCoordinate;
_myAnn.title = @"C ";
[locations addObject:_myAnn];

[self.map_View addAnnotations:locations];

  // i am using below method to display title for one annotation

      // [self.map_View selectAnnotation:_myAnn animated:YES];

     for (MKPointAnnotation *annotation in locations) {
  [self.map_View selectAnnotation:annotation animated:NO];
  }

MKCoordinateSpan span;
Span. latitudeDelta = 10;
Span. longitudeDelta = 10;

MKCoordinateRegion region;

region.span = span;
region.center = _locationCoordinate;

[self.map_View setRegion:region animated:YES];

先谢谢..

推荐答案

更新这似乎确实无法做到 - 至少没有地图视图注释API。尽管存在select和deselect方法，并且选定的annotations属性是一个数组，但似乎一次只能选择一个注释。

Update It does indeed seem that this isn't possible - at least not with the map view annotation APIs. Despite the existence of the select and deselect methods and the selected annotations property being an array, it seems that only a single annotation can be selected at a time.

它看起来像您将需要按照本答案中的建议创建自定义注释视图 - 多个注释标注显示在MKMapView

It looks like you will need to create a custom annotation view as suggested in this answer - Multiple annotation callouts displaying in MKMapView

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