在iOS 6中以编程方式打开地图应用程序

Question

NSURL *url = [NSURL URLWithString:@"http://maps.google.com/?q=New+York"];
[[UIApplication sharedApplication] openURL:url];

现在有了新的苹果地图实现，这只是向谷歌地图开放了移动Safari。我如何用iOS 6完成同样的行为？我如何以编程方式打开地图应用程序，并让它指向特定的位置/地址/搜索/什么？

Answer 1

以下是苹果官方的方式：

// Check for iOS 6
Class mapItemClass = [MKMapItem class];
if (mapItemClass && [mapItemClass respondsToSelector:@selector(openMapsWithItems:launchOptions:)]) 
{
    // Create an MKMapItem to pass to the Maps app
    CLLocationCoordinate2D coordinate = 
                CLLocationCoordinate2DMake(16.775, -3.009);
    MKPlacemark *placemark = [[MKPlacemark alloc] initWithCoordinate:coordinate 
                                            addressDictionary:nil];
    MKMapItem *mapItem = [[MKMapItem alloc] initWithPlacemark:placemark];
    [mapItem setName:@"My Place"];
    // Pass the map item to the Maps app
    [mapItem openInMapsWithLaunchOptions:nil];
}

如果您想要获取到该位置的驾驶或行走指令，可以在+OpenMapsWithItems:LaunchOptions:的数组中包含MapItemForCurrentLocation和MkMapItem，并适当设置启动选项。

// Check for iOS 6
Class mapItemClass = [MKMapItem class];
if (mapItemClass && [mapItemClass respondsToSelector:@selector(openMapsWithItems:launchOptions:)]) 
{
    // Create an MKMapItem to pass to the Maps app
    CLLocationCoordinate2D coordinate = 
                CLLocationCoordinate2DMake(16.775, -3.009);
    MKPlacemark *placemark = [[MKPlacemark alloc] initWithCoordinate:coordinate 
                                            addressDictionary:nil];
    MKMapItem *mapItem = [[MKMapItem alloc] initWithPlacemark:placemark];
    [mapItem setName:@"My Place"];

    // Set the directions mode to "Walking"
    // Can use MKLaunchOptionsDirectionsModeDriving instead
    NSDictionary *launchOptions = @{MKLaunchOptionsDirectionsModeKey : MKLaunchOptionsDirectionsModeWalking};
    // Get the "Current User Location" MKMapItem
    MKMapItem *currentLocationMapItem = [MKMapItem mapItemForCurrentLocation];
    // Pass the current location and destination map items to the Maps app
    // Set the direction mode in the launchOptions dictionary
    [MKMapItem openMapsWithItems:@[currentLocationMapItem, mapItem] 
                    launchOptions:launchOptions];
}

您可以在if之后的els语句中保留原始的iOS5和更低版本的代码。注意，如果颠倒OpenMapsWithItems:数组中项的顺序，您将得到从坐标到当前位置的方向。通过传递构造的mkmapite而不是当前的位置映射项，您可能可以使用它来获取任意两个位置之间的方向。我没试过。

// Check for iOS 6
Class mapItemClass = [MKMapItem class];
if (mapItemClass && [mapItemClass respondsToSelector:@selector(openMapsWithItems:launchOptions:)])
{
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    [geocoder geocodeAddressString:@"Piccadilly Circus, London, UK" 
        completionHandler:^(NSArray *placemarks, NSError *error) {

        // Convert the CLPlacemark to an MKPlacemark
        // Note: There's no error checking for a failed geocode
        CLPlacemark *geocodedPlacemark = [placemarks objectAtIndex:0];
        MKPlacemark *placemark = [[MKPlacemark alloc]
                                  initWithCoordinate:geocodedPlacemark.location.coordinate
                                  addressDictionary:geocodedPlacemark.addressDictionary];

        // Create a map item for the geocoded address to pass to Maps app
        MKMapItem *mapItem = [[MKMapItem alloc] initWithPlacemark:placemark];
        [mapItem setName:geocodedPlacemark.name];

        // Set the directions mode to "Driving"
        // Can use MKLaunchOptionsDirectionsModeWalking instead
        NSDictionary *launchOptions = @{MKLaunchOptionsDirectionsModeKey : MKLaunchOptionsDirectionsModeDriving};

        // Get the "Current User Location" MKMapItem
        MKMapItem *currentLocationMapItem = [MKMapItem mapItemForCurrentLocation];

        // Pass the current location and destination map items to the Maps app
        // Set the direction mode in the launchOptions dictionary
        [MKMapItem openMapsWithItems:@[currentLocationMapItem, mapItem] launchOptions:launchOptions];

    }];
}