如何在iPhone上的地图中获取当前位置
我正在创建一个应用程序,在其中我想要获取用户所在的当前位置并将其显示在地图上,当用户从当前位置到达目的地位置时,目的地位置也应该沿着方向在地图上指向的旅行。 在我的 xib 中,我添加了一个按钮 &在我称为地图的按钮的操作(showDirectionsToHere)上 我在我的 appdelegate 中添加了以下代码,但它给了我一个错误:
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation{
[manager stopUpdatingLocation];
printf("\n Latitude = " "\n Longitude = " " ",[NSString stringWithFormat:@"%.7f",newLocation.coordinate.latitude],[NSString stringWithFormat:@"%.7f",newLocation.coordinate.longitude]);
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
CLLocationManager *locationManager = [[[CLLocationManager alloc]init]autorelease];
locationManager.delegate = self;
[locationManager startUpdatingLocation];
//[self.window addSubview:viewController.view];
[self.window makeKeyAndVisible];
return YES;
}
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
printf("\nerror");
}
- (IBAction)showDirectionsToHere {
CLLocationCoordinate2D currentLocation = [self getCurrentLocation]; // LINE 1
NSString* url = [NSString stringWithFormat: @"http://maps.google.com/maps?saddr=old\%20Location&daddr=%f,%f", newLocation.latitude, newLocation.longitude];//Line 2
}
在 action(showDirectionsHere) 的第 1 行中,我收到无效初始化程序的错误 在第 2 行中,我收到 newLocation 未声明的错误。 请帮我
i am creating an application in which i want to get the current location of the user where he is and display it on the map and when the user reaches the destination location from current location the destination location should also be pointed in the map along the direction of travel.
In my xib i have added a button & on action(showDirectionsToHere) of button i have called map
I have added the following code in my appdelegate but it gives me an error:
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation{
[manager stopUpdatingLocation];
printf("\n Latitude = " "\n Longitude = " " ",[NSString stringWithFormat:@"%.7f",newLocation.coordinate.latitude],[NSString stringWithFormat:@"%.7f",newLocation.coordinate.longitude]);
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
CLLocationManager *locationManager = [[[CLLocationManager alloc]init]autorelease];
locationManager.delegate = self;
[locationManager startUpdatingLocation];
//[self.window addSubview:viewController.view];
[self.window makeKeyAndVisible];
return YES;
}
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
printf("\nerror");
}
- (IBAction)showDirectionsToHere {
CLLocationCoordinate2D currentLocation = [self getCurrentLocation]; // LINE 1
NSString* url = [NSString stringWithFormat: @"http://maps.google.com/maps?saddr=old\%20Location&daddr=%f,%f", newLocation.latitude, newLocation.longitude];//Line 2
}
in line 1 of action(showDirectionsHere) i get error of invalid initializer
in Line 2 i get error that newLocation undeclared.
Please help me
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您能否发布
getCurrentLocation
的代码,以便我们可以看到它返回的内容。变量
newLocation
未声明。我认为您的意思是函数中的currentLocation
。Can you post the code for
getCurrentLocation
so that we can see what it returns.The variable
newLocation
is undeclared. I think you meantcurrentLocation
in the function.