调用iOS自带地图应用查询路线

MapKit.framework自带的mapView只具备定位功能，不具备查询路线功能，所以调用系统iOS系统自带的地图程序来查询线路是很常见的做法，实际上要用到Google Map的API，这里先实现由一个经纬度到另一个经纬度路线的方法

 

代码很短：

    float latitude1 = 39.993638;

float longitude1 = 116.413156;

float latitude2 = 42.993638;

float longitude2 = 120.413156;

NSString *theString = [NSString stringWithFormat:@"http://maps.google.com/maps?saddr=%f,%f&daddr=%f,%f",latitude1,longitude1,latitude2, longitude2];

theString =  [theString stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];

NSURL *url = [[NSURL alloc] initWithString:theString];

[[UIApplication sharedApplication] openURL:url];

主要内容是这句话NSString *theString = [NSString stringWithFormat:@"http://maps.google.com/maps?saddr=%f,%f&daddr=%f,%f",sourceLatitude,sourceLongitude,destinyLatitude, destinyLongitude];

可以查看这个网址Google地图API，saddr是起始地址，daddr是目的地址，同理，不用坐标也可以用地名来搜索路线：

      NSString *sourcePlace=@”北京后海”;

NSString *destinyPlace=@”北京中关村图书大厦”;

NSString *theString = [NSString stringWithFormat:@"http://maps.google.com/maps?saddr=%@&daddr=%@",sourcePlace, destinyPlace];

theString =  [theString stringByAddingPercentEscapesUsingEncoding: NSUTF8StringEncoding];

NSURL *url = [[NSURL alloc] initWithString:theString];

[[UIApplication sharedApplication] openURL:url];