为什么我无法从 mapview 中删除我的注释？

Question

为什么我无法从地图视图中删除我的注释？

我的代码：

• (void)viewDidAppear:(BOOL)动画{ [超级 viewDidAppear:动画]; [自己成为FirstResponder];

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

  NSString *path = [[NSBundle mainBundle] pathForResource:@"data" ofType:@"plist"]; NSDictionary *dict = [NSDictionary dictionaryWithContentsOfFile:path];

  if ([[NSUserDefaults standardUserDefaults] boolForKey:@"blackKey"]) { NSLog(@"Black is on");

  NSArray *ann = [dict objectForKey:@"Category1"];

  for(int i = 0; i

  NSString *coordinates = [[ann objectAtIndex:i] objectForKey:@"Coordinates"];
  
  double realLatitude = [[[coordinates componentsSeparatedByString:@","] objectAtIndex:1] doubleValue];
  double realLongitude = [[[coordinates componentsSeparatedByString:@","] objectAtIndex:0] doubleValue];
  
  MyAnnotation *myAnnotation = [[MyAnnotation alloc] init];
  CLLocationCoordinate2D theCoordinate;
  theCoordinate.latitude = realLatitude;
  theCoordinate.longitude = realLongitude;
  
  myAnnotation.coordinate=CLLocationCoordinate2DMake(realLatitude,realLongitude);
  
  myAnnotation.title = [[ann objectAtIndex:i] objectForKey:@"Name"];
  myAnnotation.subtitle = [[ann objectAtIndex:i] objectForKey:@"Address"];
  myAnnotation.icon = [[ann objectAtIndex:0] objectForKey:@"Icon"];
  
  if ([[NSUserDefaults standardUserDefaults] boolForKey:@"blackKey"])
  {
      NSLog(@"Black is on");
      [mapView addAnnotation:myAnnotation];
      [annotations addObject:myAnnotation];
  
  }   else 
      {
          NSLog(@"Black is off");
  
          [self.mapView removeAnnotation:myAnnotation];
  
  
      } 
  
  }
  

  }

  否则 { //没做什么 }

   }
  

[self.mapView removeAnnotation:myAnnotation]; 不适合我

Answer 1

没有什么可以删除的。您创建注释，然后根据对 blackKey 的检查，您可以添加或删除它。但是，当您删除它时，您之前从未添加过它。