简易地图(MKMapView,CLLocationManagerDelegate,CLGeocoder)

概要

       本章主要简示了IOS里面位置服务的使用，包括定位，地图，地图标记以及地图定位。由于现在的地图开发和以前的差别比较大，而且地图涉及的东西相对而言复杂点，所以本实验耗时比较多，有的地方还存在一些问题。

结果展示

       注意文本框的两个数字是当前的经纬度，地图视图切换是切换到该经纬度的位置，最后红色的那个标注即为地图中的经纬度，不过由于经纬度解析部分有问题，所以未能显示经纬度的对应地址是什么。（示例里面不是使用代理来解析经纬度的，使用的是CLGeocoder，因为以前使用的代理官方建议不再使用了。）

流程概要

1.在开始工程之前需要知道主要步骤：a.定位当前的地址 b.解析经纬度获取对应的地址，然后地图视图切换到该位置 c.在地图上标注该位置

2.定位部分因为看到的教程较老，所以实际操作有差别，最新的定位需要增加授权。其主要方法是在修改info.list文件，然后再代码里面添加授权代码。如下所示：

/*1.Info.plist中加入两个缺省没有的字段  NSLocationAlwaysUsageDescription  NSLocationWhenInUseUsageDescription  并设置值为YES*/  //2.在启动定位前设置授权// 开始定位-(void)onLocate{    self._textLocationInfo.text = @"";    self._locateManage = [[CLLocationManager alloc] init];    self._locateManage.delegate = self;    self._locateManage.desiredAccuracy = kCLLocationAccuracyBest;    self._locateManage.distanceFilter = 1000;       // 新版本需要授权    if ([[[UIDevice currentDevice] systemVersion] doubleValue] > 8.0)    {        [self._locateManage requestWhenInUseAuthorization];    }        [self._locateManage startUpdatingLocation];    [self._locateActivityIndicator startAnimating];}

3.实现定位代理的协议和地图代理协议，主要是完成以下方法：

#pragma 实现协议CLLocationManagerDelegate// 定位成功调用该方法，数组里面最后的成员为最新的地址- (void)locationManager:(CLLocationManager *)manager     didUpdateLocations:(NSArray *)locations// 授权完成调用该方法，可查看授权状态- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status;// 定位失败调用该方法- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error;#pragma 实现协议MKMapViewDelegate// 画标注- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation;

4.在获取地址成功后，根据地址中的经纬度设置地图视图，然后使用CLGeocoder解析经纬度地址。

5.解析出地址后需要在地图上标注出当前位置，此时需要新建一个类，实现标注的协议，指定标注的经纬度、标题以及子标题

6.完成后，停止定位

主要代码

h文件

////  ViewController.h//  FindMe////  Created by God Lin on 14/12/13.//  Copyright (c) 2014年 arbboter. All rights reserved.//#import <UIKit/UIKit.h>#import <MapKit/MapKit.h>#import <CoreLocation/CoreLocation.h>@interface ViewController : UIViewController <CLLocationManagerDelegate, MKMapViewDelegate>{    MKMapView* _mapView;    UIButton* _buttonLocate;    UITextView* _textLocationInfo;    UIActivityIndicatorView* _locateActivityIndicator;        CLLocationManager* _locateManage;}@property (nonatomic, retain) MKMapView* _mapView;@property (nonatomic, retain) UIButton* _buttonLocate;@property (nonatomic, retain) UITextView* _textLocationInfo;@property (nonatomic, retain) UIActivityIndicatorView* _locateActivityIndicator;@property (nonatomic, retain) CLLocationManager* _locateManage;@end

m文件

////  ViewController.m//  FindMe////  Created by God Lin on 14/12/13.//  Copyright (c) 2014年 arbboter. All rights reserved.//#import "ViewController.h"#import "MapLocation.h"@interface ViewController ()@end@implementation ViewController@synthesize _buttonLocate, _locateActivityIndicator, _mapView, _textLocationInfo;@synthesize _locateManage;// 界面控件布局-(void)autoLayout{    CGFloat _x = self.view.frame.origin.x;    CGFloat _y = self.view.frame.origin.y;    CGFloat _w = self.view.frame.size.width;    CGFloat _h = self.view.frame.size.height;        CGFloat xEdge = 10;    CGFloat yEdge = 10;    CGFloat x = _x + xEdge;    CGFloat y = _y + 2*yEdge;    CGFloat w = _w - 2*xEdge;    CGFloat h = 50;        self._mapView.frame = CGRectMake(x, y, w, _h - y - yEdge - h);        y = self._mapView.frame.origin.y + self._mapView.frame.size.height + yEdge;    h -= 5;    self._buttonLocate.frame = CGRectMake(x, y, w/5, h);    self._buttonLocate.layer.cornerRadius = 10;    self._buttonLocate.layer.borderWidth = 1;    [self._buttonLocate setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];    [self._buttonLocate setTitle:@"Locate" forState:UIControlStateNormal];        CGFloat xSameLevelEdge = 2;    x = x + self._buttonLocate.frame.size.width;    self._textLocationInfo.frame = CGRectMake(x+xSameLevelEdge, y, 4*w/5-xSameLevelEdge, h);    self._textLocationInfo.layer.borderWidth = 1;    self._textLocationInfo.layer.cornerRadius = 10;    self._textLocationInfo.editable = NO;        self._locateActivityIndicator.frame = CGRectMake(0,0, h*2, h*2);    [self._locateActivityIndicator setCenter:CGPointMake(_w/2, _h/2)];    [self._locateActivityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleWhiteLarge];    self._locateActivityIndicator.color = [UIColor blackColor];}// 开始定位-(void)onLocate{    self._textLocationInfo.text = @"";    self._locateManage = [[CLLocationManager alloc] init];    self._locateManage.delegate = self;    self._locateManage.desiredAccuracy = kCLLocationAccuracyBest;    self._locateManage.distanceFilter = 1000;       // 新版本需要授权    if ([[[UIDevice currentDevice] systemVersion] doubleValue] > 8.0)    {        [self._locateManage requestWhenInUseAuthorization];    }        [self._locateManage startUpdatingLocation];    [self._locateActivityIndicator startAnimating];}-(void)stopLocate{    if(self._locateManage)    {        [self._locateManage stopUpdatingLocation];        self._locateManage.delegate = nil;        [self._locateManage release];        self._locateManage = nil;        [self._locateActivityIndicator stopAnimating];    }}- (void)viewDidLoad{    [super viewDidLoad];        self._mapView = [[MKMapView alloc] init];    [self.view addSubview:self._mapView];        self._buttonLocate = [[UIButton alloc] init];    [self._buttonLocate addTarget:self action:@selector(onLocate) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:self._buttonLocate];        self._textLocationInfo = [[UITextView alloc] init];    [self.view addSubview:self._textLocationInfo];        self._locateActivityIndicator = [[UIActivityIndicatorView alloc] init];    [self.view addSubview:self._locateActivityIndicator];        [self autoLayout];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}-(void)dealloc{    [_locateActivityIndicator release];    [_mapView release];    [_textLocationInfo release];    [_buttonLocate release];    [super dealloc];}#pragma 实现协议CLLocationManagerDelegate- (void)locationManager:(CLLocationManager *)manager     didUpdateLocations:(NSArray *)locations{    NSLog(@"%@", locations);    CLLocation* curLocation = [locations lastObject];        // 地图定位到当前位置    MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(curLocation.coordinate, 1000, 1000);    viewRegion = [self._mapView regionThatFits:viewRegion];    [self._mapView setRegion:viewRegion animated:YES];        // 解析经纬度为地址，在地图上添加标注    MapLocation* annotation = [[MapLocation alloc] init];    annotation.coordinate = curLocation.coordinate;    CLGeocoder* geoCoder = [[CLGeocoder alloc] init];    [geoCoder reverseGeocodeLocation:curLocation completionHandler:^(NSArray *placemarks, NSError *error)    {        if(error)        {            NSLog(@"CLGeocoder error -> %@", [error localizedDescription]);        }        else        {            CLPlacemark *placemark = [placemarks lastObject];            NSString* startAddressString = [NSString stringWithFormat:@"%@ %@ %@ %@ %@ %@",                                            placemark.subThoroughfare, placemark.thoroughfare,                                            placemark.postalCode, placemark.locality,                                            placemark.administrativeArea,                                            placemark.country];            NSLog(@"地址为:%@", startAddressString);                                    annotation._city = placemark.locality;            annotation._country = placemark.country;            annotation._streetAddrerss = placemark.thoroughfare;            annotation._zip = placemark.postalCode;            annotation._state = placemark.name;        }    }];    [self._mapView addAnnotation:annotation];    [geoCoder release];        // 设置文本信息    NSString* stringLocation = [[NSString alloc] initWithFormat:@"%@\n%@", annotation.subtitle, annotation.title];    self._textLocationInfo.text = stringLocation;    [stringLocation release];        [annotation release];    [self stopLocate];}- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status{    NSLog(@"Authorization finished. status = %d", status);}- (void)locationManager:(CLLocationManager *)manager       didFailWithError:(NSError *)error{    UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"Locate Failed" message:[error description] delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];    NSLog(@"%@", [error description]);    [alert show];    [alert release];    [self._locateActivityIndicator stopAnimating];        [self stopLocate];}#pragma 实现协议MKMapViewDelegate// 画标注- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation;{    MKPinAnnotationView* annotationView = (MKPinAnnotationView*)[self._mapView dequeueReusableAnnotationViewWithIdentifier:@"annotationView"];    if(annotationView == nil)    {        annotationView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"annotationView"] autorelease];    }    annotationView.canShowCallout = YES;    annotationView.pinColor = MKPinAnnotationColorRed;    annotationView.animatesDrop = YES;    return annotationView;}@end

（实现标注协议的类见工程代码）

项目工程