xcode - 如何在按下按钮时同时传递纬度和经度坐标并在下一个地图视图上放置图钉？

Question

如果有人能在最后一段帮助我，我觉得我已经接近了！

目前我有以下内容：

{
   CLLocationCoordinate2D location;
   location.latitude = (double) 44.4758;
   location.longitude = (double) -73.2125;

   str = [[NSNumber numberWithDouble:location.longitude] stringValue];

   viewController.stringToDisplay = str;
}

现在，这是通过经度值，但它当然不会让我包括纬度。我可以写什么以将两者包含在同一行中？

谢谢！

Answer 1

例如：

 str = [NSString stringWithFormat:@"%f, %f", location.latitude, location.longitude];

或更易于阅读：

 str = [NSString stringWithFormat:@"%.2f, %.2f", location.latitude, location.longitude];

Answer 2

做到了！！很高兴。我根据按下的按钮从前一个视图传递不同的坐标，并使用 IF 语句将这些坐标固定在下一个视图上。对于编程大师来说，这无疑是一件简单的事情，但我没有经验，所以我很高兴:)

-(void)viewWillAppear:(BOOL)animated

{
  CLLocationCoordinate2D location;
  NSLog(@"self.stringToDisplay = %@", self.stringToDisplay);

  if ([self.stringToDisplay isEqualToString: @"44.48, -73.21"])
  {
    location.latitude = (double) 44.4758;
    location.longitude = (double) -73.2125;

    MapViewAnnotation *newAnnotation = [[MapViewAnnotation alloc] initWithTitle:@"Burlington, VT" andCoordinate:location];
    [self.mapView addAnnotation:newAnnotation];
  }

  if ([self.stringToDisplay isEqualToString: @"51.50, -0.14"])
  {
    location.latitude = (double) 51.5010;
    location.longitude = (double) -0.1425;

    MapViewAnnotation *newAnnotation = [[MapViewAnnotation alloc] initWithTitle:@"Buckingham Palace" andCoordinate:location];
    [self.mapView addAnnotation:newAnnotation];
  }
}