我在我的应用程序中使用拆分视图控制器。左侧面板(主视图控制器)保存带有酒店列表的表视图,在右侧,详细视图控制器包含用于显示位置的MapView。最初我在应用程序启动时显示当前位置。然后从表视图中选择一个值后,我试图在地图中显示酒店位置。不幸的是,即使通过适当的纬度和经度值,我仍然无法改变地区,我根本看不到位置的任何变化。
以下是用于理解!!
的实现代码段- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *hotelInfo = [self.hotelDetails objectAtIndex:indexPath.row];
NSString *placeLatitude = [hotelInfo valueForKey:@"Latitude"];
NSString *placeLongitude = [hotelInfo valueForKey:@"Longitude"];
CLLocationCoordinate2D location;
location.latitude = [placeLatitude doubleValue];
location.longitude = [placeLongitude doubleValue];
[self setMapViewLocation:location];
}
-(void)setMapViewLocation:(CLLocationCoordinate2D)location
{
[[MapView sharedMapInstance] updateMapViewWithLocation:location];
}
以下是我如何利用位置值为MapView设置区域:
-(void)updateMapViewWithLocation:(CLLocationCoordinate2D)location
{
// [self.locationManager startUpdatingLocation];
// NSLog(@"latitude:%f,longitude:%f",location.latitude,location.longitude);
//
// MKCoordinateRegion region;
// region.center = location;
//
// MKCoordinateSpan span;
// span.latitudeDelta = 0.015;
// span.longitudeDelta = 0.015;
// region.span = span;
// NSLog(@"Center (%f, %f) span (%f, %f) user: (%f, %f)| IN!", region.center.latitude, region.center.longitude, region.span.latitudeDelta, region.span.longitudeDelta, location.latitude, location.longitude);
//
// [self.locationView setRegion:region animated:YES];
// MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(location, 800, 800);
// MKCoordinateSpan span = {.latitudeDelta = 0.015, .longitudeDelta = 0.015};
MKCoordinateRegion region;
region.center = location;
[self.locationView setRegion:[self.locationView regionThatFits:region] animated:NO];
}
评论的行是我尝试的各种解决方案组合,但似乎没有任何效果。
注意:我能够准确传递坐标值,因为我在日志中找到了正确的值。
有人可以帮助我,谢谢:)
答案 0 :(得分:1)
感谢安娜先生指出我朝着正确的方向前进。不是通过单例访问详细视图类或实例化类对象,而是使用 UISplitViewController的viewControllers 数组访问detailView然后进行更改,即:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSDictionary *hotelInfo = [self.hotelDetails objectAtIndex:indexPath.row];
NSString *placeLatitude = [hotelInfo valueForKey:@"Latitude"];
NSString *placeLongitude = [hotelInfo valueForKey:@"Longitude"];
CLLocationCoordinate2D location;
location.latitude = [placeLatitude doubleValue];
location.longitude = [placeLongitude doubleValue];
[self setMapViewLocation:location];
}
-(void)setMapViewLocation:(CLLocationCoordinate2D)location
{
self.dvc = [self.splitViewController.viewControllers lastObject];
MKCoordinateRegion region;
region.center = location;
MKCoordinateSpan span;
span.latitudeDelta = 0.015;
span.longitudeDelta = 0.015;
region.span = span;
[self.dvc.locationView setRegion:[self.dvc.locationView regionThatFits:region] animated:NO];
}
希望它有所帮助,谢谢:)