how to check if Mapkit is available or not? - iphone

Question

I am building an application that is using Mapkit. I know that this is only available in IOS6.
So I should check if this is available or not. I am using the following code.
if(NSClassFromString(#"MKMapKit")) {
// MKMapKit is available in this OS
CLLocationCoordinate2D coords =
CLLocationCoordinate2DMake(51.097185,5.621653);
NSDictionary *address = #{
(NSString *)kABPersonAddressStreetKey: #"Weg naar oqdffds 59",
(NSString *)kABPersonAddressCityKey: #"Msfsf",
(NSString *)kABPersonAddressStateKey: #"Limbusqfqsdf",
(NSString *)kABPersonAddressZIPKey: #"3670",
(NSString *)kABPersonAddressCountryCodeKey: #"BE",
(NSString *)kABPersonPhoneMainLabel:#"04741234567"
};
MKPlacemark *place = [[MKPlacemark alloc]
initWithCoordinate:coords addressDictionary:address];
MKMapItem *mapItem = [[MKMapItem alloc]initWithPlacemark:place];
mapItem.phoneNumber = #"0141343252";
//current location
MKMapItem *mapItem2 = [MKMapItem mapItemForCurrentLocation];
NSArray *mapItems = #[mapItem, mapItem2];
NSDictionary *options = #{
MKLaunchOptionsDirectionsModeKey:MKLaunchOptionsDirectionsModeDriving,
MKLaunchOptionsMapTypeKey:
[NSNumber numberWithInteger:MKMapTypeStandard],
MKLaunchOptionsShowsTrafficKey:#YES
};
[MKMapItem openMapsWithItems:mapItems launchOptions:options];
}else {
NSLog(#"tot hier");
// MKMapKit is not available in this OS
locationController = [[MyCLController alloc] init];
locationController.delegate = self;
[locationController.locationManager startUpdatingLocation];
}
But for some reason or another it always use the google method.
Can anybody help!

Answer 1

As already mentioned, MapKit has been available well before iOS 6.
What you want to check for is MKMapItem (not "MKMapKit").
However, as the documentation for MKMapItem explains (with a code example):
To determine whether a class is available at runtime in a given iOS
release, you typically check whether that class is nil. Unfortunately,
this test is not cleanly accurate for MKMapItem. Although this class
was publicly available starting with iOS 6.0, it was in development
prior to that. Although the class exists in earlier releases, you
should not attempt to use it in those releases.
To determine at runtime whether you can use map items in your
application, test whether the class and the
openMapsWithItems:launchOptions: class method exist. That method was
not added to the class until iOS 6.0. The code might look like the
following:
Class itemClass = [MKMapItem class];
if (itemClass && [itemClass
respondsToSelector:#selector(openMapsWithItems:launchOptions:)]) {
// Use class
}
So this check:
if(NSClassFromString(#"MKMapKit")) {
should be:
Class itemClass = [MKMapItem class];
if (itemClass && [itemClass respondsToSelector:#selector(openMapsWithItems:launchOptions:)]) {
or:
Class itemClass = NSClassFromString(#"MKMapItem");
if (itemClass && [itemClass respondsToSelector:#selector(openMapsWithItems:launchOptions:)]) {

Answer 2

MkMapKit is available in ios 4.3, too, probably in 3.x, too!
What is new, is (like in all Releases), some new methods of MkMapKit:
You should better check for that specific method you need
(geocoding ?=
Look into the headers of MkMapKit you are importing (if i remeber correctly: MkMapKit.h), there are Macros defining the availability
of a specifc method, depending on the ios version.