如何创建MKCoordinateRegion

Question

如何创建MKCoordinateRegion.

    NSString *latitudeString =  [locationString substringToIndex:startRange.location];
    NSString *longtitudeString = [locationString substringWithRange:NSMakeRange(startRange.location+2,((endRange.location-1)-(startRange.location+2)))];
    CLLocationCoordinate2D coord = CLLocationCoordinate2DMake((int)latitudeString, (int)longtitudeString);

    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(coord, 500, 500);`

我收到错误" 无效区域中心:+392128672.00000000,+ 392128704.00000000范围:+0.00448287,-0.01195557 "

Answer 1

删除类型铸件.使用以下代码.

CLLocationCoordinate2D coord = CLLocationCoordinate2DMake([latitudeString doubleValue], [longtitudeString doubleValue]);
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(coord, 500, 500);