ios - 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 跨度:+0.00448287，-0.01195557”

Answer 1

移除类型转换。使用以下代码。

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