我真的不太确定如何把这个词输入谷歌，所以我会尝试在这里问它。我正试图使用MapKit在地图上显示仅一个城市的不同路线。有没有办法限制API中可以使用的世界地图数量？
欢迎提出任何建议。
如果将其添加到viewDidLoad中：
MKCoordinateRegion region={{0.0,0.0,},{0,0.0}};
region.center.latitude = 30.44;
region.center.longitude = -84.31;
region.span.latitudeDelta=0.03;
region.span.longitudeDelta=0.03;
[mapView setRegion:region animated:YES];
[mapView setMapType:MKMapTypeStandard];
[mapView setZoomEnabled:YES];
[mapView setScrollEnabled:NO];
[mapView setDelegate:self];
它将以lat和long为中心，放大倍数由latDelta和longDelta指定。这些值越低，缩放的距离就越近。
MKMapView will notify its delegate whenever the map is scrolled (via delegate methods -mapView:regionWillChangeAnimated: and
– mapView:regionDidChangeAnimated:). Perhaps you could write some code in those methods to check and see whether the user has scrolled outside of the city, and if so, use setRegion:animated: to move the map back into the correct bounds.
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