Question

我想为应用设置默认区域，每次打开地图时都应该显示一个区域。例如，每次打开地图时，都应显示“伦敦”。

我这样做了，但它没有居中

@interface AppleMapViewController ()

@end

@implementation TicinoWineAppleMapViewController
@synthesize mapView = _mapView;

#define DEFAULT_LATITUDE 46.006512
#define DEFAULT_LONGITUDE 8.952312

#define THE_SPAN 10.0f


- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {

    }
    return self;
}


- (void)viewWillAppear:(BOOL)animated
{
    NSLog(@"ViewWillAppear");

}

- (void)createDefaultRegion
{
    MKCoordinateRegion defaultRegion;

    CLLocationCoordinate2D center;
    center.latitude = DEFAULT_LATITUDE;
    center.longitude = DEFAULT_LONGITUDE;

    MKCoordinateSpan span;
    span.latitudeDelta = THE_SPAN;
    span.longitudeDelta = THE_SPAN;

  //  defaultRegion.center = center;
  //  defaultRegion.span = span;

    defaultRegion = MKCoordinateRegionMake(center, span);

    TicinoWineMapViewAnnotation *annotation = [[TicinoWineMapViewAnnotation alloc]initWithTitle:@"ciao" andCoordinate:center];
    [_mapView addAnnotation:annotation];


    [_mapView setRegion:defaultRegion animated:YES];
    [_mapView setCenterCoordinate:center animated:YES];

}

- (void)viewDidLoad
{
    [super viewDidLoad];

    [self createDefaultRegion];


}


@end

我尝试了两种方法：

    [_mapView setRegion:defaultRegion animated:YES];
    [_mapView setCenterCoordinate:center animated:YES];

但它不是以我想要的为中心。这可能是模拟器的问题？

Answer 1

您可以尝试此功能。它对我有用。

（无效）recenterMap
{

NSArray * coordinates = [Mapsview valueForKeyPath：@“annotations.coordinate”];

CLLocationCoordinate2D maxCoord = { - 90.0f，-180.0f};
CLLocationCoordinate2D minCoord = {90.0f，180.0f};

for（NSValue *坐标中的值）{
```
CLLocationCoordinate2D coord = {0.0f, 0.0f};

[value getValue:&coord];

if(coord.longitude > maxCoord.longitude) {            
    maxCoord.longitude = coord.longitude;            
}        
if(coord.latitude > maxCoord.latitude) {            
    maxCoord.latitude = coord.latitude;            
}        
if(coord.longitude < minCoord.longitude) {            
    minCoord.longitude = coord.longitude;            
}        
if(coord.latitude < minCoord.latitude) {            
    minCoord.latitude = coord.latitude;
}        
```
}

MKCoordinateRegion region = {{0.0f，0.0f}，{0.0f，0.0f}};

// region.center.longitude =（minCoord.longitude + maxCoord.longitude）/ 2.0; // region.center.latitude =（minCoord.latitude + maxCoord.latitude）/ 2.0;

region.center.longitude = minCoord.longitude +（maxCoord.longitude - minCoord.longitude）/2.0f; region.center.latitude = minCoord.latitude +（maxCoord.latitude - minCoord.latitude）/2.0f;

region.span.longitudeDelta =（maxCoord.longitude - minCoord.longitude）* 1.5; region.span.latitudeDelta =（maxCoord.latitude - minCoord.latitude）* 1.5;

[Mapsview setRegion：region animated：YES];

}

Apple地图显示默认区域

1 个答案: