iOS 跳转设置定位

//在app中有方法跳转本app的设置开启定位，openURL方法在iOS2.0以上系统均支持
          NSURL *url = [[NSURL alloc] initWithString:UIApplicationOpenSettingsURLString];
           
          if( [[UIApplication sharedApplication] canOpenURL:url]) {
           
          [[UIApplication sharedApplication] openURL:url];