cllocation和mkreversegeocoder

问题描述

我尝试使用cllocation和mkreversegeocoder来检索城市名称。我的viewdidload方法中的
我是cllocationmanager：

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];

以及之后：

- (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我的价值时才有效。在第二次应用程序崩溃。
我认为是因为地理编码器已启动，我认为我必须只有一个运行。 （但我真的不是这个......）。在哪种方式我可以控制地理编码器正在运行？

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?

我看到我可以使用cllocationcoordinate2d在我的viewdidload中使用mkreversegeocoder但是......我可以通过哪种方式来检索newlocation 。坐标？

I've see that i can istance mkreversegeocoder in my viewdidload using cllocationcoordinate2d but ... in which way i can retreive newlocation.coordinate?

我已部分解决将地理编码器声明为类变量并检查

I've partially resolve declaring geocoder as class variable and checking

if (self.geocoder != nil) {
   [geocoder release];
}

但....如果在我的

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark
*)placemark

或在我的

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailedWithError:(@NSError
*)error

我发布或取消我的对象？
我感觉很蠢：D

i release or cancel my object?I'm feeling so stupid :D

推荐答案

不要将反向地理编码器创建为局部变量。

Don't create the reverse geocoder as a local variable.

查看示例应用程序。请参阅MapViewController.h和MapViewController.m。

Look at the MKReverseGeocoder example in the CurrentAddress sample app provided by Apple. See MapViewController.h and MapViewController.m.

在代码中使用相同的模式。

Follow the same pattern in your code.

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