CLLocationManager用法示例

概述MyCLController.h #import <CoreLocation/CoreLocation.h>// This is hoping that in the future (beyond SDK 2.0) we can access SystemConfiguration info#import <SystemConfiguration/SCNetworkConnection.h>

MyCLController.h

#@R_404_5565@ <CoreLocation/CoreLocation.h>// This is hoPing that in the future (beyond SDK 2.0) we can access SystemConfiguration info#@R_404_5565@ <SystemConfiguration/SCNetworkConnection.h>// This protocol is used to send the info for location updates back to another vIEw controller@protocol MyCLControllerDelegate <NSObject>@required-(voID)gpsUpdate:(CLLocation *)aLoc;@end// Class deFinition@interface MyCLController : NSObject <CLLocationManagerDelegate> {	CLLocationManager *locationManager;	CLLocation *myCurrentLoc;	BOol findShouldStop;	ID delegate;}@property (nonatomic,retain) CLLocationManager *locationManager;@property (nonatomic,assign) ID <MyCLControllerDelegate> delegate;@property (nonatomic,assign) CLLocation *myCurrentLoc;- (voID)locationManager:(CLLocationManager *)manager	dIDUpdatetoLocation:(CLLocation *)newLocation		   fromLocation:(CLLocation *)oldLocation;- (voID)locationManager:(CLLocationManager *)manager	   dIDFailWithError:(NSError *)error;+ (MyCLController *)sharedInstance;@end

MyCLController.m

#@R_404_5565@ "MyCLController.h"// This is a singleton class,see belowstatic MyCLController *sharedCLDelegate = nil;@implementation MyCLController@synthesize delegate,locationManager,myCurrentLoc;- (ID) init {		self = [super init];	if (self != nil) {		self.locationManager = [[CLLocationManager alloc] init];		self.locationManager.delegate = self; // Tells the location manager to send updates to this object		self.myCurrentLoc = [[CLLocation alloc] initWithLatitude:0 longitude:0];		[self.locationManager startUpdatingLocation];	}	return self;}// Called when the location is updated- (voID)locationManager:(CLLocationManager *)manager    dIDUpdatetoLocation:(CLLocation *)newLocation           fromLocation:(CLLocation *)oldLocation{				// Horizontal coordinates	if (signbit(newLocation.horizontalAccuracy)) {		// Negative accuracy means an invalID or unavailable measurement		[self.delegate gpsUpdate:nil];		return;	}    	//	// Altitude (we don't care about it)	//	if (signbit(newLocation.verticalAccuracy)) {	//		// Negative accuracy means an invalID or unavailable measurement	//	}    	// Check the timestamp,see if it's an hour old or more. If so,don't send an update	if (ABS([newLocation.timestamp timeIntervalSinceNow]) > 3600) {		[self.delegate gpsUpdate:nil];		return;	}		[myCurrentLoc release];    myCurrentLoc = [newLocation copy]; // Todo: Why does this increment the retain count? We should be manually retaining		// Looks like the loc is good	[self.delegate gpsUpdate:myCurrentLoc];	return;}// Called when there is an error getting the location// Todo: Update this function to return the proper info in the proper UI fIElds- (voID)locationManager:(CLLocationManager *)manager       dIDFailWithError:(NSError *)error{		NSMutableString *errorString = [[[NSMutableString alloc] init] autorelease];	BOol shouldQuit;    	if ([error domain] == kCLErrorDomain) {        		// We handle CoreLocation-related errors here        		switch ([error code]) {                // This error code is usually returned whenever user taps "Don't Allow" in response to                // being told your app wants to access the current location. Once this happens,you cannot                // attempt to get the location again until the app has quit and @R_970_4404@ed.                //                // "Don't Allow" on two successive app launches is the same as saying "never allow". The user                // can reset this for all apps by going to Settings > General > reset > reset Location Warnings.                //			case kCLErrorDenIEd:				[errorString appendFormat:@"%@\n",NSLocalizedString(@"LocationDenIEd",nil)];				[errorString appendFormat:@"%@\n",NSLocalizedString(@"AppWillQuit",nil)];				shouldQuit = YES;				break;                                // This error code is usually returned whenever the device has no data or WiFi connectivity,// or when the location cannot be determined for some other reason.                //                // CoreLocation will keep trying,so you can keep waiting,or prompt the user.                //			case kCLErrorLocationUnkNown:				[errorString appendFormat:@"%@\n",NSLocalizedString(@"LocationUnkNown",nil)];				shouldQuit = YES;				break;                                // We shouldn't ever get an unkNown error code,but just in case...                //			default:				[errorString appendFormat:@"%@ %d\n",NSLocalizedString(@"GenericLocationError",nil),[error code]];				shouldQuit = NO;				break;		}	} else {		// We handle all non-CoreLocation errors here		// (we depend on localizedDescription for localization)		[errorString appendFormat:@"Error domain: \"%@\"  Error code: %d\n",[error domain],[error code]];		[errorString appendFormat:@"Description: \"%@\"\n",[error localizedDescription]];		shouldQuit = NO;	}    	// Todo: Send the delegate the alert?	if (shouldQuit) {		// do nothing	}}#pragma mark ---- singleton object methods ----// See "Creating a Singleton Instance" in the Cocoa Fundamentals GuIDe for more info+ (MyCLController *)sharedInstance {    @synchronized(self) {        if (sharedCLDelegate == nil) {            [[self alloc] init]; // assignment not done here        }    }    return sharedCLDelegate;}+ (ID)allocWithZone:(NSZone *)zone {    @synchronized(self) {        if (sharedCLDelegate == nil) {            sharedCLDelegate = [super allocWithZone:zone];            return sharedCLDelegate;  // assignment and return on first allocation        }    }    return nil; // on subsequent allocation attempts return nil}- (ID)copyWithZone:(NSZone *)zone{    return self;}- (ID)retain {    return self;}- (unsigned)retainCount {    return UINT_MAX;  // denotes an object that cannot be released}- (voID)release {    //do nothing}- (ID)autorelease {    return self;}@end

在用MKReverseGeocoder的时候是不是经常crash呀，那是因为在同一时刻只能存在一个MKReverseGeocoder实例。

参考资料：

http://evilrockhopper.com/2010/01/iphone-development-reverse-geocoding/

http://www.iphonedevsdk.com/forum/iphone-sdk-development/31883-pbrequestererrordomain-errors-reverse-geocoding.html

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