Question

在我的应用程序中，我添加了一个MKMapView作为UITableView的顶视图。 MapView的高度为250，可见区域为80。每当找到一个位置时，我想将该位置（注释）置于可见区域中，即MapView的底部80px。

这是我到目前为止：https://dl.dropbox.com/u/3077127/MapViewDemo.mov

我尝试了很多不同的东西，但我找不到解决方案。我删除了我现在测试的东西。这是我的代码：

float kMapHeaderHeight = 250.0f;
float kMapContentInset = 80.0f;
BOOL favFirstPositionFound = NO;

- (void)viewDidLoad {
    [super viewDidLoad];
    [self setTitle:NSLocalizedString(@"Favorites", @"FavoritesViewController")];

    // Set up the edit and add buttons.
    self.navigationItem.leftBarButtonItem = self.editButtonItem;

    self.mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, -kMapHeaderHeight, self.tableView.frame.size.width, kMapHeaderHeight)];
    [self.mapView setShowsUserLocation:YES];
    [self.mapView setDelegate:self];
    [self.mapView setUserInteractionEnabled:NO];

    [self.tableView addSubview:self.mapView];

    self.tableView.contentInset = UIEdgeInsetsMake(kMapContentInset, 0.0f, 0.0f, 0.0f);
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    if (scrollView.isDragging) {
        if (self.tableView.contentOffset.y < kMapContentInset-((self.view.bounds.size.height/3)*2))
        {
            NSLog(@"Far enough!");
        }
    }
}
[...]
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
    location=newLocation.coordinate;

    MKCoordinateRegion region;
    region.center=location;

    MKCoordinateSpan span;

    if (!favFirstPositionFound)
    {
        span.latitudeDelta=.010;
        span.longitudeDelta=.010;
    }
    else {
        span.latitudeDelta = self.mapView.region.span.latitudeDelta;
        span.longitudeDelta = self.mapView.region.span.longitudeDelta;
    }

    region.span=span;

    favFirstPositionFound = YES;
    [self.mapView setRegion:region animated:YES];

    [self.locationManager stopUpdatingLocation];
}

Answer 1

好吧，花了一段时间......但我自己想出来了。

我现在所做的是使用当前位置CLLocationCoordinate2D并从中获取相应的地图点。然后我使用地图可见矩形的宽度和高度调整定位。

https://dl.dropbox.com/u/3077127/MapViewDemoResult.mov

代码尚未重构，因为我刚刚找到了解决方案......但你可以随意自己做;）

最终结果：

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    float offset = fabs(self.tableView.contentOffset.y);
    float diff = (1.0 - ((offset/2) / kMapHeaderHeight));

    MKMapRect r = [self.mapView visibleMapRect];
    MKMapPoint pt = MKMapPointForCoordinate(location);

    r.origin.x = pt.x - r.size.width * 0.50;
    r.origin.y = pt.y - r.size.height * diff;
    [self.mapView setVisibleMapRect:r animated:NO];

    MKCoordinateRegion region = self.mapView.region;

    MKCoordinateSpan span;
    span.latitudeDelta=.010;
    span.longitudeDelta=.010;

    region.span=span;

    [self.mapView setRegion:region animated:NO];

    if (scrollView.isDragging) {
        if (self.tableView.contentOffset.y < kMapContentInset-((self.view.bounds.size.height/3)*2))
        {
            NSLog(@"Halfway there!");
        }
    }
}

将地图居中到可见区域

1 个答案: