ios - 如何在 iOS 中设置缩放级别？

Question

我正在使用下面给出的代码在 map View 中设置区域:

    CLLocationCoordinate2D loc = (CLLocationCoordinate2D )[self geoCodeUsingAddress:searchBar.text];

    CLLocationDistance visibleDistance = 100000;
    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, visibleDistance, visibleDistance);
    MKCoordinateRegion adjustedRegion = [self.mapView regionThatFits:region];

    [self.mapView setRegion:adjustedRegion animated:YES];
    [self.mapView setCenterCoordinate:loc];
    [self.mapView setZoomEnabled:YES];

它在一个小区域内显示整个 map 。如何增加缩放级别？

Answer 1

您还可以借助 MapView 的 span 值。为那个小区域制作动画并跨度 map 以缩放所需的值。

使用下面的代码:

CLLocationCoordinate2D loc = (CLLocationCoordinate2D )[self geoCodeUsingAddress:searchBar.text];

[UIView animateWithDuration:1.5 animations:^{

    MKCoordinateRegion region;
    region.center.latitude = loc.latitude;
    region.center.longitude = loc.longitude;
    region.span.latitudeDelta = 0.15f;       // Decrement value to zoom
    region.span.longitudeDelta = 0.15f;      // Decrement value to zoom

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

} completion:^(BOOL finished) { }];