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iOS 定位和地图

發布時間：2024/1/8 编程问答 37 豆豆

生活随笔收集整理的這篇文章主要介紹了 iOS 定位和地图小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

iOS中有三個定位服務組件：

?? Wifi定位，通過查詢一個Wifi路由器的地理位置的信息。比較省電，iPod touch和iPad也可以采用。

?? 蜂窩基站定位，通過移動運用商基站定位。也適合有3G版本的iPod touch和iPad。

?? GPS衛星定位，通過3-4顆GPS定位位置定位，最為準確，但是耗電量大，不能遮擋。

Core Location

Core Location是iPhone、iPad等開發定位服務應用程序的框架。我們要在Xcode中添加“CoreLocation.framework”存在的框架。

主要使用的類是：CLLocationManager，通過CLLocationManager實現定位服務。

CoreLocation.framework

定位服務實例

項目WhereAmI：

WhereAmIViewController.h

#import <UIKit/UIKit.h> #import <CoreLocation/CoreLocation.h>@interface ViewController : UIViewController<CLLocationManagerDelegate> {CLLocationManager* locationManager; }@property (strong, nonatomic) CLLocationManager* locationManager; @property (retain, nonatomic) IBOutlet UILabel *longitudeText; @property (retain, nonatomic) IBOutlet UILabel *latituduText; @property (retain, nonatomic) IBOutlet UIActivityIndicatorView *activity; - (IBAction)findMe:(id)sender; - (IBAction)webMap:(id)sender;@end

CLLocationManagerDelegate是定位服務的委托，常用的位置變化回調方法是：

locationManager:didUpdateToLocation:fromLocation: locationManager:didFailWithError:

CLLocationManager 是定位服務管理類，通過它可以設置定位服務的參數、獲取經緯度等。

m中加載方法

- (IBAction)findMe:(id)sender {self.locationManager = [[[CLLocationManager alloc] init] autorelease];self.locationManager.delegate = self;self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;self.locationManager.distanceFilter = 1000.0f;[self.locationManager startUpdatingLocation];[activity startAnimating];NSLog(@"start gps"); }

CLLocationManager 是的startUpdatingLocation方法啟動所有定位硬件，對應的方法是stopUpdatingLocation，通過調用該方法關閉定位服務器更新，為了省電必須在不用的時候調用該方法關閉定位服務。

此外，我們還可以在這里設定定位服務的參數，包括：distanceFilter和desiredAccuracy。

distanceFilter，這個屬性用來控制定位服務更新頻率。單位是“米”。 desiredAccuracy，這個屬性用來控制定位精度，精度

越高耗電量越大。

定位精度?

desiredAccuracy精度參數可以iOS SDK通過常量實現：

? kCLLocationAccuracyNearestTenMeters，10米?

? kCLLocationAccuracyHundredMeters ，100米

? kCLLocationAccuracyKilometer ，1000米

? kCLLocationAccuracyThreeKilometers，3000米

? kCLLocationAccuracyBest ，最好的精度

? kCLLocationAccuracyBestForNavigation，導航情況下最好精度，iOS 4 SDK新增加。一般要有外接電源時候才能使用。

委托方法用于實現位置的更新

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {latituduText.text = [NSString stringWithFormat:@"%3.5f",newLocation.coordinate.latitude];longitudeText.text = [NSString stringWithFormat:@"%3.5f",newLocation.coordinate.longitude];[activity stopAnimating];[locationManager stopUpdatingLocation];NSLog(@"location ok"); }

該委托方法不僅可以獲得當前位置（newLocation），還可以獲得上次的位置（oldLocation ），CLLocation 對象coordinate.latitude屬性獲得經度，coordinate.longitude屬性獲得緯度。

[NSString stringWithFormat:@"%3.5f”, newLocation.coordinate.latitude]? 中的%3.5f是輸出整數部分是3位，小數部分是5位的浮點數。

11.2 iOS地圖

iOS應用程序中使用Map Kit API開發地圖應用程序。

其核心是MKMapView類使用。

多數情況下地圖會與定位服務結合使用。

地圖開發一般過程

添加MapKit類庫

MapKit.framework

MapMeViewController.h

#import <UIKit/UIKit.h> #import <MapKit/MapKit.h> #import <CoreLocation/CoreLocation.h> #import "MapLocation.h"@interface ViewController : UIViewController<CLLocationManagerDelegate, MKReverseGeocoderDelegate, MKMapViewDelegate> {}@property (retain, nonatomic) IBOutlet MKMapView *mapView; @property (retain, nonatomic) IBOutlet UIActivityIndicatorView *activity; - (IBAction)findMe:(id)sender; @end

CLLocationManagerDelegate是定位服務委托。

MKMapViewDelegate是地圖視圖委托，主要方法：

?? -mapView:viewForAnnotation:

?? -mapViewDidFailLoadingMap:withError:

MKReverseGeocoderDelegate是給地理坐標獲得標志點信息的委托，用于地理信息編碼（即：從坐標獲得地點獲得信息），主要委托方法：

?? – reverseGeocoder:didFindPlacemark:

?? – reverseGeocoder:didFailWithError:

m文件中的視圖加載和卸載

- (void)viewDidLoad {[super viewDidLoad];mapView.mapType = MKMapTypeStandard;//mapView.mapType = MKMapTypeSatellite;//mapView.mapType = MKMapTypeHybrid;mapView.delegate = self; }

mapView.mapType = MKMapTypeStandard;是指定地圖的類型，iOS提供了三種風格的地圖:

? MKMapTypeStandard標準地圖模式

? MKMapTypeSatellite衛星地圖模式

? MKMapTypeHybrid具有街道等信息的衛星地圖模式

mapView.delegate = self;是將委托對象指定為自身。

按鈕事件

- (IBAction)findMe:(id)sender {CLLocationManager *lm = [[CLLocationManager alloc] init];lm.delegate = self;lm.desiredAccuracy = kCLLocationAccuracyBest;[lm startUpdatingLocation];activity.hidden = NO;[activity startAnimating]; }

點擊按鈕時候通過定位服務獲取當前位置信息。

通過lm.delegate = self;是將委托對象指定為自身。

因此，點擊事件發生時候將會回調CLLocationManagerDelegate委托的

-locationManager:didUpdateToLocation:fromLocation:方法。

回調位置更新方法

#pragma mark CLLocationManagerDelegate Methods - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(newLocation.coordinate, 2000, 2000); //[mapView setRegion:viewRegion animated:YES];MKCoordinateRegion adjustedRegion = [mapView regionThatFits:viewRegion];[mapView setRegion:adjustedRegion animated:YES];manager.delegate = nil;[manager stopUpdatingLocation];MKReverseGeocoder *geocoder = [[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate];geocoder.delegate = self;[geocoder start]; }

MKCoordinateRegionMakeWithDistance(newLocation.coordinate, 2000, 2000); 該函數能夠創建一個MKCoordinateRegion結構體，第一個參數是一個CLLocationCoordinate2D結構指定了目標區域的中心點，第二個是目標區域南北的跨度單位是米，第三個是目標區域東西的跨度單位是米。后兩個參數的調整會影響地圖縮放。

[[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate]; 創建地理編碼對象geocoder，通過該對象可以把坐標轉換成為地理信息的描述。

geocoder.delegate = self;指定編碼的處理是自身對象。

? [geocoder start];開始編碼處理。

? MKReverseGeocoderDelegate

是地理編碼委托對象，該委托的方法：

? 成功時候調用-reverseGeocoder:didFindPlacemark:

? 失敗時候調用-reverseGeocoder:didFailWithError:

成功編碼回調方法

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark {MapLocation *annotation = [[MapLocation alloc] init];annotation.streetAddress = placemark.thoroughfare;annotation.city = placemark.locality;annotation.state = placemark.administrativeArea;annotation.zip = placemark.postalCode;annotation.coordinate = geocoder.coordinate;[mapView addAnnotation:annotation]; [annotation release]; geocoder.delegate = nil;[geocoder autorelease];[activity stopAnimating];activity.hidden = YES; }

成功編碼后需要在該方法中創建標注對象（MapLocation）。MapLocation 是我們自定義的實現MKAnnotation協議標注對象。該方法的placemark是MKPlacemark獲得很多地理信息，詳細見下表。

[mapView addAnnotation:annotation]; 為地圖添加標注，該方法將會觸發mapView:viewForAnnotation:方法回調。

MKPlacemark類屬性

addressDictionary? 地址信息的dictionary

thoroughfare? 指定街道級別信息

subThoroughfare? 指定街道級別的附加信息

locality? 指定城市信息

subLocality? 指定城市信息附加信息

administrativeArea? 行政區域

subAdministrativeArea? 行政區域附加信息

country? 國家信息

countryCode? 國家代號

postalCode? 郵政編碼

失敗編碼回調方法

- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error {UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"地理解碼錯誤息"message:@"地理代碼不能識別" delegate:nilcancelButtonTitle:@"Ok"otherButtonTitles:nil];[alert show];[alert release];geocoder.delegate = nil;[geocoder autorelease];[activity stopAnimating]; }

MKMapViewDelegate

是地圖視圖委托對象，本例子我們使用的方法：

? - mapView:viewForAnnotation:為地圖設置標注時候回調方法。

? -mapViewDidFailLoadingMap:withError:地圖加載錯誤時候回調方法。

地圖標注回調方法

#pragma mark Map View Delegate Methods - (MKAnnotationView *) mapView:(MKMapView *)theMapView viewForAnnotation:(id <MKAnnotation>) annotation {MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"PIN_ANNOTATION"];if(annotationView == nil) {annotationView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotationreuseIdentifier:@"PIN_ANNOTATION"] autorelease];}annotationView.canShowCallout = YES;annotationView.pinColor = MKPinAnnotationColorRed;annotationView.animatesDrop = YES;annotationView.highlighted = YES;annotationView.draggable = YES;return annotationView; }

與表格視圖單元格處理類似，地圖標注對象由于會很多，因此需要重復利用，通過

dequeueReusableAnnotationViewWithIdentifier方法可以查找可重復利用的標注對象，以達到節省內存的目的。

annotationView.canShowCallout = YES;指定標注上的插圖，點擊圖釘有氣泡顯示。

annotationView.pinColor 設置圖釘的顏色。

annotationView.animatesDrop動畫效果。

地圖加載失敗回調方法

- (void)mapViewDidFailLoadingMap:(MKMapView *)theMapView withError:(NSError *)error {UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"地圖加載錯誤"message:[error localizedDescription] delegate:nil cancelButtonTitle:@"Ok"otherButtonTitles:nil];[alert show];[alert release]; }

自定義地圖標注對象?

#import <Foundation/Foundation.h> #import <MapKit/MapKit.h>@interface MapLocation : NSObject <MKAnnotation, NSCoding> {NSString *streetAddress;NSString *city;NSString *state;NSString *zip;CLLocationCoordinate2D coordinate; } @property (nonatomic, copy) NSString *streetAddress; @property (nonatomic, copy) NSString *city; @property (nonatomic, copy) NSString *state; @property (nonatomic, copy) NSString *zip; @property (nonatomic, readwrite) CLLocationCoordinate2D coordinate; @end

作為地圖標注對象實現MKAnnotation協議是必須的，只有實現該協議才能使該類成為標注類。實現NSCoding協議是可選的，實現該協議可以使標注對象能夠復制。里面的屬性有哪些要看你自己的需要。

MapLocation.m

- (NSString *)title {return @"您的位置!"; } - (NSString *)subtitle {NSMutableString *ret = [NSMutableString string];if (streetAddress)[ret appendString:streetAddress]; if (streetAddress && (city || state || zip)) [ret appendString:@" ? "];if (city)[ret appendString:city];if (city && state)[ret appendString:@", "];if (state)[ret appendString:state];if (zip)[ret appendFormat:@", %@", zip];return ret; }

title 和subtitle 是MKAnnotation協議要求實現的方法。

MapLocation.m

#pragma mark - - (void)dealloc {[streetAddress release];[city release];[state release];[zip release];[super dealloc]; } #pragma mark - #pragma mark NSCoding Methods - (void) encodeWithCoder: (NSCoder *)encoder {[encoder encodeObject: [self streetAddress] forKey: @"streetAddress"];[encoder encodeObject: [self city] forKey: @"city"];[encoder encodeObject: [self state] forKey: @"state"];[encoder encodeObject: [self zip] forKey: @"zip"]; } - (id) initWithCoder: (NSCoder *)decoder {if (self = [super init]) {[self setStreetAddress: [decoder decodeObjectForKey: @"streetAddress"]];[self setCity: [decoder decodeObjectForKey: @"city"]];[self setState: [decoder decodeObjectForKey: @"state"]];[self setZip: [decoder decodeObjectForKey: @"zip"]];}return self; }

encodeWithCoder：和initWithCoder：是NSCoding協議要求實現方法。

11.3 Web地圖

在iOS中我們還可以使用Web地圖。

- (IBAction)webMap:(id)sender {CLLocation *lastLocation = [locationManager location];if(!lastLocation) {UIAlertView *alert;alert = [[UIAlertView alloc] initWithTitle:@"系統錯誤" message:@"還沒有接收到數據！" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil];[alert show];[alert release];return;}NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps?q=Here+I+Am!@%f,%f", lastLocation.coordinate.latitude, lastLocation.coordinate.longitude];NSURL *url = [NSURL URLWithString:urlString];[[UIApplication sharedApplication] openURL:url]; }

與iOS6的蘋果didUpdateLocations代替didUpdateToLocation的釋放。任何人都可以解釋如何didUpdateLocations？
本文地址：CodeGo.net/507856/?

-------------------------------------------------------------------------------------------------------------------------

1. 我以下的委托，以獲得最后一個位置？
- (void)locationManager:(CLLocationManager *)manager?
?didUpdateToLocation:(CLLocation *)newLocation?
? ?fromLocation:(CLLocation *)oldLocation

上述委托棄用的iOS 6。現在，下面應該
- (void)locationManager:(CLLocationManager *)manager?
? didUpdateLocations:(NSArray *)locations

為了獲得最后的位置，只需獲取數組的最后一個對象：
[locations lastObject]

換句話說，[locations lastObject]（新代表）等于newLocation（老代表）。?

2. 它給你的對象數組來訪問最后一個位置你
[locations lastObject]

由此
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations

3. 這里沒有其他的答案中解釋了為什么有一個位置陣列，以及如何將新didUpdateLocations：提供的數組。貶低的目的locationManager:didUpdateToLocation:fromLocation:和發送位置一個NSArray，而不是在后臺運行時降低功耗。與iPhone 5開始時，GPS芯片具有存儲位置的一段，然后傳送在一次陣列中的他們所有的能力。這被稱為延遲的位置更新。這允許主CPU進入睡眠狀態，而在背景中較長的時間。的iOS不具備啟動主CPU的每個位置更新時，CPU可以睡，而GPS芯片集的位置。您可以檢查這個deferredLocationUpdatesAvailable方法。如果可用，您可以啟用allowDeferredLocationUpdatesUntilTraveled:timeout:方法。條件適用，看到這個答案的細節。?

4. 如果你支持的iOS 5和6，你應該叫
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations,?

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

功能，通過建立的位置的陣列。

本文標題：didUpdateLocations代替didUpdateToLocation
本文地址：CodeGo.net/507856/?
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IOS定位核心與地圖

? ? ? ? ? ? ???

Core Location以及Map框架包通常能給我們的應用程序添加定位和地圖相關的服務。Core Location框架包通常是使用硬件設備來進行定位服務的，Map框架包通常能夠使你的應用程序做一些地圖展示與交互的相關功能。地圖的定位服務一般需要依賴設備的硬件組成部分。如果有定位的硬件設備，那么肯定是可以利用地圖框架包來進行地圖的一些相關的操作。?

為了能夠在項目中使用到位置服務以及地圖展示的相關功能，你必須要導入Core Location?和Map這兩個框架包。如果你不知道怎么做，那么請參照如下步驟。?

1.點擊你的項目工程圖標文件。?

2.然后選擇target選項，如圖1所示。?

3.然后選擇Build Phase模塊欄。?

4.然后點開Link Binary With Libraries欄目，在點擊+號按鈕。

圖1?添加相關的框架包

5.添加MapKit.framework和CoreLocation.framework這兩個庫

6.在使用地圖和定位的地方，導入：

#import <CoreLocation/CoreLocation.h>

#import <MapKit/MapKit.h>

MKMapView是UIView的子類，所以可以像一個普通的View一樣添加到ViewController的View當中。

以下是相關的代碼

ViewController.h

#import?<UIKit/UIKit.h>?

#import?<CoreLocation/CoreLocation.h>?

#import?<MapKit/MapKit.h>?

#import?"MyAnnotation.h"?

@interface?ViewController : UIViewController <MKMapViewDelegate,CLLocationManagerDelegate>?

// MapView

@property (nonatomic,strong) MKMapView *myMapView;// 地圖控件?

// LocationManager

@property (nonatomic,strong) CLLocationManager *myLocationManager;// 位置管理器?

@property (nonatomic,strong) CLGeocoder *myGeoCoder ;// 地理位置和真實地址轉換?

@end?

ViewController.m

#import?"ViewController.h"?

#import?"MKMapView+ZoomLevel.h"?

@interface?ViewController ()?

@end?

@implementation ViewController?

@synthesize myMapView;?

@synthesize myLocationManager;?

@synthesize myGeoCoder;?

- (void)viewDidLoad?

????[super?viewDidLoad];?

???// Do any additional setup after loading the view, typically from a nib.

????// 設置根View的背景顏色

????self.view.backgroundColor = [UIColor colorWithRed:0x33 / 255.0f green:0x66 / 255.0f blue:0x99 / 255.0f alpha:0xFF / 255.0f];?

????// 初始化MapView并且設置MapView顯示的邊界

????self.myMapView = [[MKMapView alloc]initWithFrame:self.view.bounds];?

// self.myMapView.mapType = MKMapTypeSatellite;

// self.myMapView.mapType = MKMapTypeHybrid;

????self.myMapView.mapType = MKMapTypeStandard;?

????self.myMapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;?

????self.myMapView.delegate?= self;?

????CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(40.034122, 116.289574);?

????MyAnnotation *annotation = [[MyAnnotation alloc]initWithCoordinate:coordinate title:@"我的位置" subTitle:@"這里就是寡人的位置，嘿嘿！"];?

????annotation.pinColor = MKPinAnnotationColorPurple;?

????[self.myMapView addAnnotation:annotation];?

????[self.myMapView setShowsUserLocation:YES];?

????[self.myMapView setCenterCoordinate:coordinate zoomLevel:15 animated:YES];?

????[self.view addSubview:myMapView];?

????if([CLLocationManager locationServicesEnabled]){?

????????self.myLocationManager = [[CLLocationManager alloc]init];?

????????self.myLocationManager.delegate?= self;?

// // 提示用戶是否允許當前應用使用地理位置，已過時，在Info.plist中使用NSLocationUsageDescription鍵值替換

// self.myLocationManager.purpose = @"提示用戶是否允許當前應用使用位置，已過時";

????????[self.myLocationManager startUpdatingLocation];?

????}else{?

????????NSLog(@">>>>>>>>>> 位置服務不可用 <<<<<<<<<<<<");?

????????UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示" message:@"您的位置服務當前不可用，請打開位置服務后重試"?delegate:nil cancelButtonTitle:@"確定" otherButtonTitles:nil, nil];?

????????[alertView show];?

????}?

????CLLocation *location = [[CLLocation alloc]initWithLatitude:40.034122 longitude:116.289574];?

????self.myGeoCoder = [[CLGeocoder alloc]init];?

????[self.myGeoCoder reverseGeocodeLocation:location completionHandler:^(NSArray *placemarks,NSError *error){?

????????if(error == nil && [placemarks count] > 0){?

????????????CLPlacemark *pm = [placemarks objectAtIndex:0];?

????????????NSLog(@"國家：%@" ,pm.country);?

????????????NSLog(@"郵編：%@",pm.postalCode);?

????????????NSLog(@"Locality:%@",pm.locality);?

????????}else?if(error == nil && [placemarks count] == 0){?

????????????NSLog(@"沒有地址返回");?

????????}else?if(error != nil){?

????????????NSLog(@"出錯了：%@",error);?

????????}?

????}];?

????[self.myGeoCoder geocodeAddressString:@"中國北京市海淀區花園東路10號高德大廈" completionHandler:^(NSArray *placemarks,NSError *error){?

????????if(nil == error && [placemarks count] > 0){?

????????????NSLog(@"placemarks count:%i",[placemarks count]);?

????????????CLPlacemark *pm = [placemarks objectAtIndex:0];?

????????????NSLog(@"longitude=%f",pm.location.coordinate.longitude);?

????????????NSLog(@"latitude=%f",pm.location.coordinate.latitude);?

????????}else?if([placemarks count] == 0 && error == nil){?

????????????NSLog(@"找不到給定地址的經緯度");?

????????}else?if(nil != nil){?

????????????NSLog(@"發生了錯誤:%@",error);?

????????}?

????}];?

- (void)didReceiveMemoryWarning?

????[super?didReceiveMemoryWarning];?

????// Dispose of any resources that can be recreated.

-(void)viewDidUnload?

????[super?viewDidUnload];?

????self.myMapView = nil;?

????[self.myLocationManager stopUpdatingLocation];?

????self.myLocationManager = nil;?

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation?

????return?YES;?

/*******************************************************************************************/

/*************************** MapView的Delegate的方法，全部都是Option的 *************************/

/*******************************************************************************************/

- (void)mapView:(MKMapView *)mapView regionWillChangeAnimated:(BOOL)animated {?

????NSLog(@"mapView:regionWillChangeAnimated:方法被調用");?

// 用戶的地理位置發生改變的時候調用

- (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated {?

????NSLog(@"mapView:regionDidChangeAnimated：方法被調用");?

// 當地圖界面將要加載的時候將會調用這個方法

- (void)mapViewWillStartLoadingMap:(MKMapView *)mapView{?

????NSLog(@"mapViewWillStartLoadingMap:方法被調用");?

// 當地圖界面加載完成的時候將要調用這個方法

- (void)mapViewDidFinishLoadingMap:(MKMapView *)mapView{?

????NSLog(@"mapViewDidFinishLoadingMap:方法被調用");?

// 當地圖界面加載失敗的時候調用這個方法

- (void)mapViewDidFailLoadingMap:(MKMapView *)mapView withError:(NSError *)error{?

????NSLog(@"mapViewDidFailLoadingMap:withError:方法被調用，error is:%@" , [error description]);?

// 添加到地圖的Annotation

// mapView:viewForAnnotation: provides the view for each annotation.

// This method may be called for all or some of the added annotations.

// For MapKit provided annotations (eg. MKUserLocation) return nil to use the MapKit provided annotation view.

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation?

????MKAnnotationView *view = nil;?

????if([annotation isKindOfClass:[MyAnnotation?class]] == NO){?

????????return?view;?

????}?

????if([mapView isEqual:self.myMapView] == NO){?

????????return?view;?

????}?

????MyAnnotation *senderAnnotation = (MyAnnotation*)annotation;?

????NSString *pinReusableIdentifier = [MyAnnotation reusableIdentifierForPinColor:senderAnnotation.pinColor];?

????MKPinAnnotationView *annotationView = (MKPinAnnotationView*)[mapView dequeueReusableAnnotationViewWithIdentifier:pinReusableIdentifier];?

????if(annotationView == nil){?

????????annotationView = [[MKPinAnnotationView alloc]initWithAnnotation:senderAnnotation reuseIdentifier:pinReusableIdentifier];?

????????[annotationView setCanShowCallout:YES];?

????}?

????annotationView.pinColor = senderAnnotation.pinColor;?

????NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);?

????NSString *documentPath = [paths objectAtIndex:0];?

????NSString *cachePath = [documentPath stringByAppendingString:@"/images"];?

????NSString *cacheFile = [cachePath stringByAppendingString:@"icon.image"];?

????if([[NSFileManager defaultManager]fileExistsAtPath:cacheFile]){?

????????UIImage *image = [UIImage imageWithContentsOfFile:cacheFile];?

????????if(image != nil){?

????????????annotationView.image = image;?

????????????NSLog(@"通過本地設置圖片");?

????????}else{?

????????????[self setAnnotionImageByUrl:annotationView cacheFile:cacheFile];?

????????}?

????}else{?

????????[self setAnnotionImageByUrl:annotationView cacheFile:cacheFile];?

????}?

????view = annotationView;?

????return?view;?

-(void) setAnnotionImageByUrl:(MKPinAnnotationView *)annotationView cacheFile:(NSString *) cacheFile{?

????NSLog(@"通過網絡設置文件");?

????dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);?

????dispatch_async(queue, ^{?

????????NSURL *url = [NSURL URLWithString:@"http://www.baidu.com/img/duanwulogo_94a0060bda0885d1c2320ca0d7d7c342.gif"];?

????????NSData *data = [NSData dataWithContentsOfURL:url];?

????????if(data != nil){?

????????????[data writeToFile:cacheFile atomically:YES];?

????????????UIImage *image = [UIImage imageWithData:data];?

????????????dispatch_queue_t mainQueue = dispatch_get_main_queue();?

????????????dispatch_async(mainQueue, ^{?

????????????????if(image != nil){?

????????????????????annotationView.image = image;?

????????????????}?

????????????});?

????????}?

????});?

/**?

// mapView:didAddAnnotationViews: is called after the annotation views have been added and positioned in the map.?

// The delegate can implement this method to animate the adding of the annotations views.?

// Use the current positions of the annotation views as the destinations of the animation.?

- (void)mapView:(MKMapView *)mapView didAddAnnotationViews:(NSArray *)views;?

// mapView:annotationView:calloutAccessoryControlTapped: is called when the user taps on left & right callout accessory UIControls.?

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control;?

- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view NS_AVAILABLE(NA, 4_0);?

- (void)mapView:(MKMapView *)mapView didDeselectAnnotationView:(MKAnnotationView *)view NS_AVAILABLE(NA, 4_0);?

- (void)mapViewWillStartLocatingUser:(MKMapView *)mapView NS_AVAILABLE(NA, 4_0);?

- (void)mapViewDidStopLocatingUser:(MKMapView *)mapView NS_AVAILABLE(NA, 4_0);?

- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation NS_AVAILABLE(NA, 4_0);?

- (void)mapView:(MKMapView *)mapView didFailToLocateUserWithError:(NSError *)error NS_AVAILABLE(NA, 4_0);?

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view didChangeDragState:(MKAnnotationViewDragState)newState?

fromOldState:(MKAnnotationViewDragState)oldState NS_AVAILABLE(NA, 4_0);?

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay NS_AVAILABLE(NA, 4_0);?

// Called after the provided overlay views have been added and positioned in the map.?

- (void)mapView:(MKMapView *)mapView didAddOverlayViews:(NSArray *)overlayViews NS_AVAILABLE(NA, 4_0);?

- (void)mapView:(MKMapView *)mapView didChangeUserTrackingMode:(MKUserTrackingMode)mode animated:(BOOL)animated NS_AVAILABLE(NA, 5_0);?

/*******************************************************************************************/

/*************************** 位置相關 *************************/

/*******************************************************************************************/

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

????NSLog(@"Latitude=%f",newLocation.coordinate.latitude);?

????NSLog(@"Longitude=%f",newLocation.coordinate.longitude);?

-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error?

????NSLog(@"獲得位置失敗");?

@end?

MKMapView+ZoomLevel.h

#import?<MapKit/MapKit.h>?

@interface?MKMapView (ZoomLevel)?

- (void)setCenterCoordinate:(CLLocationCoordinate2D)centerCoordinate?

??????????????????zoomLevel:(NSUInteger)zoomLevel?

???????????????????animated:(BOOL)animated;?

@end?

MKMapView+ZoomLevel.m

#import?"MKMapView+ZoomLevel.h"?

@implementation MKMapView (ZoomLevel)?

#define MERCATOR_OFFSET 268435456?

#define MERCATOR_RADIUS 85445659.44705395?

#pragma mark -?

#pragma mark Map conversion methods?

- (double)longitudeToPixelSpaceX:(double)longitude?

????return?round(MERCATOR_OFFSET + MERCATOR_RADIUS * longitude * M_PI / 180.0);?

- (double)latitudeToPixelSpaceY:(double)latitude?

????return?round(MERCATOR_OFFSET - MERCATOR_RADIUS * logf((1 + sinf(latitude * M_PI / 180.0)) / (1 - sinf(latitude * M_PI / 180.0))) / 2.0);?

- (double)pixelSpaceXToLongitude:(double)pixelX?

????return?((round(pixelX) - MERCATOR_OFFSET) / MERCATOR_RADIUS) * 180.0 / M_PI;?

- (double)pixelSpaceYToLatitude:(double)pixelY?

????return?(M_PI / 2.0 - 2.0 * atan(exp((round(pixelY) - MERCATOR_OFFSET) / MERCATOR_RADIUS))) * 180.0 / M_PI;?

#pragma mark -?

#pragma mark Helper methods?

- (MKCoordinateSpan)coordinateSpanWithMapView:(MKMapView *)mapView?

?????????????????????????????centerCoordinate:(CLLocationCoordinate2D)centerCoordinate?

?????????????????????????????????andZoomLevel:(NSUInteger)zoomLevel?

????// convert center coordiate to pixel space

????double?centerPixelX = [self longitudeToPixelSpaceX:centerCoordinate.longitude];?

????double?centerPixelY = [self latitudeToPixelSpaceY:centerCoordinate.latitude];?

????// determine the scale value from the zoom level

????NSInteger zoomExponent = 20 - zoomLevel;?

????double?zoomScale = pow(2, zoomExponent);?

????// scale the map's size in pixel space

????CGSize mapSizeInPixels = mapView.bounds.size;?

????double?scaledMapWidth = mapSizeInPixels.width * zoomScale;?

????double?scaledMapHeight = mapSizeInPixels.height * zoomScale;?

????// figure out the position of the top-left pixel

????double?topLeftPixelX = centerPixelX - (scaledMapWidth / 2);?

????double?topLeftPixelY = centerPixelY - (scaledMapHeight / 2);?

????// find delta between left and right longitudes

????CLLocationDegrees minLng = [self pixelSpaceXToLongitude:topLeftPixelX];?

????CLLocationDegrees maxLng = [self pixelSpaceXToLongitude:topLeftPixelX + scaledMapWidth];?

????CLLocationDegrees longitudeDelta = maxLng - minLng;?

????// find delta between top and bottom latitudes

????CLLocationDegrees minLat = [self pixelSpaceYToLatitude:topLeftPixelY];?

????CLLocationDegrees maxLat = [self pixelSpaceYToLatitude:topLeftPixelY + scaledMapHeight];?

????CLLocationDegrees latitudeDelta = -1 * (maxLat - minLat);?

????// create and return the lat/lng span

????MKCoordinateSpan span = MKCoordinateSpanMake(latitudeDelta, longitudeDelta);?

????return?span;?

#pragma mark -?

#pragma mark Public methods?

- (void)setCenterCoordinate:(CLLocationCoordinate2D)centerCoordinate?

??????????????????zoomLevel:(NSUInteger)zoomLevel?

???????????????????animated:(BOOL)animated?

????// clamp large numbers to 28

????zoomLevel = MIN(zoomLevel, 28);?

????// use the zoom level to compute the region

????MKCoordinateSpan span = [self coordinateSpanWithMapView:self centerCoordinate:centerCoordinate andZoomLevel:zoomLevel];?

????MKCoordinateRegion region = MKCoordinateRegionMake(centerCoordinate, span);?

????// set the region like normal

????[self setRegion:region animated:animated];?

@end?

MyAnnotation.h

#import?<Foundation/Foundation.h>?

#import?<CoreLocation/CoreLocation.h>?

#import?<MapKit/MapKit.h>?

#define REUSABLE_PIN_RED @"Red"?

#define REUSABLE_PIN_GREEN @"Green"?

#define REUSABLE_PIN_PURPLE @"Purple"?

@interface?MyAnnotation : NSObject <MKAnnotation>?

@property (nonatomic,readonly) CLLocationCoordinate2D coordinate;?

@property (nonatomic, readonly, copy) NSString *title;?

@property (nonatomic, readonly, copy) NSString *subtitle;?

@property (nonatomic,unsafe_unretained) MKPinAnnotationColor pinColor;?

-(id) initWithCoordinate:(CLLocationCoordinate2D) coordinate?

???????????????????title:(NSString*) paramTitle?

????????????????subTitle:(NSString*) paramSubTitle;?

// 得到顏色

+(NSString *) reusableIdentifierForPinColor:(MKPinAnnotationColor) paramColor;?

@end?

MyAnnotation.m

#import?"MyAnnotation.h"?

@implementation MyAnnotation?

@synthesize coordinate,title,subtitle,pinColor;?

-(id) initWithCoordinate?

:(CLLocationCoordinate2D) paramCoordinate title:(NSString *)paramTitle subTitle:(NSString *)paramSubTitle?

????self = [super?init];?

????if(self != nil){?

????????coordinate = paramCoordinate;?

????????title = paramTitle;?

????????subtitle = paramSubTitle;?

????????pinColor = MKPinAnnotationColorGreen;?

????}?

????return?self;?

+(NSString *)reusableIdentifierForPinColor:(MKPinAnnotationColor)paramColor?

????NSString *result = nil;?

????switch?(paramColor) {?

????????case?MKPinAnnotationColorRed:?

????????????result = REUSABLE_PIN_RED;?

????????????break;?

????????case?MKPinAnnotationColorGreen:?

????????????result = REUSABLE_PIN_GREEN;?

????????????break;?

????????case?MKPinAnnotationColorPurple:?

????????????result = REUSABLE_PIN_PURPLE;?

????}?

????return?result;?

@end?

注意，在使用用戶的位置的時候,系統會彈出是否允許應用使用位置的對話框，這個對話框中的提示文字，可以自己進行定義

在系統版本是6.0(包括6.0)以上的時候，在Info.plist文件中進行定義

<key>NSLocationUsageDescription</key>

<string>是否可以使用位置？如果需要使用本應用，是必須的！</string>

在6.0以下，這樣進行定義

// // 提示用戶是否允許當前應用使用地理位置，已過時，在Info.plist中使用NSLocationUsageDescription鍵值替換

// self.myLocationManager.purpose = @"提示用戶是否允許當前應用使用位置，已過時";

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