CLLocationManager 位置定位

来源：互联网发布：带着淘宝穿古代txt下载编辑：程序博客网时间：2024/05/22 10:37

转：http://my.oschina.net/chengliqun/blog/147870

最近由于项目需要，需要使用LBS相关技术，但网上搜索了一圈，文章不是很多，故自己就从头整理记录些吧，以供日后温习参考；

下面就开始吧，首先，如标题，先定位吧。

第一步，新建一个singleView的空白工程,如果新建，这里不做赘述了。

第二步：因为地图开发相关的framework：MapKit.framework、CoreLocation.framework，至于如何添加，一般的ios相关博客都是有介绍。

在主界面的控制器 ViewController.h 文件中，我们啥也不做，.m文件中，我们需声明一个 CLLocationManager* locationManager的属性，我们让其实现CLLocationManagerDelegate的协议，并覆写其更新位置的方法，如下：

////  ViewController.m//  LBS_001_CLLocationManager////  Created by liqun on 13-7-17.//  Copyright (c) 2013年 Block Cheng. All rights reserved.//#import "ViewController.h"#import <CoreLocation/CoreLocation.h>@interface ViewController ()<CLLocationManagerDelegate>{    }@property (nonatomic,retain)CLLocationManager* locationManager;@end@implementation ViewController-(id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {        NSLog(@"nibName:  %@   bundle: %@",nibBundleOrNil,nibBundleOrNil);        _locationManager = [[CLLocationManager alloc] init];            }        return  self;}- (void)dealloc{    self.locationManager = nil;    [super dealloc];}- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.    //delegate    self.locationManager.delegate = self;    //The desired location accuracy.    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;    //Specifies the minimum update distance in meters.    self.locationManager.distanceFilter = kCLDistanceFilterNone;    self.locationManager.purpose = @"To provide functionality based on user's current location.";    [self.locationManager startUpdatingLocation];}- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {    NSLog(@"didChangeAuthorizationStatus---%u",status);}- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{    NSLog(@"didChangeAuthorizationStatus----%@",error);}- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{    UIAlertView* av = [[UIAlertView alloc] initWithTitle:@"update" message:[NSString stringWithFormat:@"didUpdateToLocation:  newLocation: %@  old:%@",newLocation,oldLocation] delegate:nil cancelButtonTitle:@"cancel" otherButtonTitles:@"ok", nil];    [av show];    [av release];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];}@end

程序启动后，系统会进行授权询问，如下：

点击好同意后，便能得到相应的位置信息，在代理的回调方法中，弹出信息

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation

效果如下：

其实，在给出获取位置信息前，我们应该给出用户以提示的，见上效果图：

self.locationManager.purpose = @"To provide functionality based on user's current location.";

如果用户拒绝后，我们应该做相应的提示处理，在代理方法中也需做相应的处理。

还有一种开去位置服务的方法，先检查位置服务是否可用，再获取：

if ([CLLocationManager locationServicesEnabled]){    self.locationManager = [[CLLocationManager alloc] init];    self.locationManager.delegate = self;    self.locationManager.purpose = @"To provide functionality based on user's current location.";    [self.locationManager startUpdatingLocation];} else {    /* Location services are not enabled.     Take appropriate action: for instance, prompt the user to enable location services */    NSLog(@"Location services are not enabled");}

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