MKCoordinateRegion未以正确的方式显示在地图上

Question

我使用以下代码在地图MKMapView上进行缩小。

float zoom=1.5;
MKCoordinateRegion region;
//Set Zoom level using Span
MKCoordinateSpan span;  
region.center=mapView.region.center;
span.latitudeDelta=mapView.region.span.latitudeDelta *zoom;
span.longitudeDelta=mapView.region.span.longitudeDelta *zoom;
region.span=span;
[mapView setRegion:region animated:TRUE];

但在zoom=1.1、zoom=1.3或zoom=1.5的情况下，map在所有3种情况下都显示相同的区域。此区域看起来与zoom=2时相同。

如何显示地图，以便在这些情况下都能显示正确的区域？

Answer 1

试试这个……

region.span.longitudeDelta = 0.01f;
region.span.latitudeDelta = 0.01f;
[mapView setRegion:region animated:YES]; 

您可以设置span.longitudeDelta和span.latitudeDelta作为您想要放大或缩小的程度。并初始化MKCoordinateRegion..

MKCoordinateRegion region = { {0.0, 0.0 }, { 0.0, 0.0 } } 

将delegate设置为mapView

[mapView setDelegate:self];

Answer 2

尝尝这个

MKCoordinateSpan span; 
//You can set span for how much Zoom to be display
span.latitudeDelta=.005;
span.longitudeDelta=.005;

//set Region to be display on MKMapView
MKCoordinateRegion cordinateRegion;
cordinateRegion.center=latAndLongLocation.coordinate;
//latAndLongLocation coordinates to be display 
cordinateRegion.span=span;

[mapView setRegion:cordinateRegion animated:YES];
//mapView MkMapView

它肯定能行得通。