cllocation 和 mkreversegeocoder
我尝试使用 cllocation 和 mkreversegeocoder 检索城市名称。 在我的 viewdidload 方法中，我 istance cllocationmanager:
self.locManager = [[CLLocationManager alloc] init];
locManager.delegate = self;
locManager.desiredAccuracy = kCLLocationAccuracyBest;
[locManager startUpdatingLocation];
和之后：
- (void) locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation
*)newLocation
fromLocation:(CLLocation *)oldLocation {
//some code to retrieve my information
MKReverseGeocoder *geoCoder = [[MKReverseGeocoder alloc]
initWithCoordinate:newLocation.coordinate ];
geoCoder.delegate = self;
[geoCoder start];
}
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark
*)placemark
{
MKPlacemark *myPlacemark = placemark;
citta.text = [placemark locality];
}
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error{
citta.text =@ "Unknow";
应用程序仅在我第一次获得值时才起作用。在第二次应用程序崩溃时。 我认为是因为地理编码器已启动，并且我认为我必须运行一个且只有一个实例。 （但我真的对此不确定......）。我可以通过什么方式控制地理编码器的运行？
我发现我可以使用 cllocationcoordinate2d 在我的 viewdidload 中使用 mkreversegeocoder 但是...我可以通过哪种方式检索 newlocation.coordinate ？
我已经部分解决了将地理编码器声明为类变量并检查
if (self.geocoder != nil) {
[geocoder release];
}
但是....如果在我
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark
*)placemark
或我的
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailedWithError:(@NSError
*)error
我中释放或取消我的对象？ 我感觉自己好傻 :D
i'm try to retreiving city name with cllocation and mkreversegeocoder.
in my viewdidload method i istance cllocationmanager:
self.locManager = [[CLLocationManager alloc] init];
locManager.delegate = self;
locManager.desiredAccuracy = kCLLocationAccuracyBest;
[locManager startUpdatingLocation];
and after:
- (void) locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation
*)newLocation
fromLocation:(CLLocation *)oldLocation {
//some code to retrieve my information
MKReverseGeocoder *geoCoder = [[MKReverseGeocoder alloc]
initWithCoordinate:newLocation.coordinate ];
geoCoder.delegate = self;
[geoCoder start];
}
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark
*)placemark
{
MKPlacemark *myPlacemark = placemark;
citta.text = [placemark locality];
}
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error{
citta.text =@ "Unknow";
Application works only the first time i get my value. on the second time app crash.
I think is because geocoder is started and i think i must have one and only one istance running. (but i'm really not shure of this...). in which way i can controll geocoder is running?
I've see that i can istance mkreversegeocoder in my viewdidload using cllocationcoordinate2d but ... in which way i can retreive newlocation.coordinate?
I've partially resolve declaring geocoder as class variable and checking
if (self.geocoder != nil) {
[geocoder release];
}
but.... if in my
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark
*)placemark
or in my
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailedWithError:(@NSError
*)error
i release or cancel my object?
I'm feeling so stupid :D
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不要将反向地理编码器创建为局部变量。
查看 CurrentAddress 示例应用中的 MKReverseGeocoder 示例由苹果公司提供。请参阅 MapViewController.h 和 MapViewController.m。
在您的代码中遵循相同的模式。
Don't create the reverse geocoder as a local variable.
Look at the MKReverseGeocoder example in the CurrentAddress sample app provided by Apple. See MapViewController.h and MapViewController.m.
Follow the same pattern in your code.