IOS CoreLocation

環境：
I5、4G
Win7旗艦版 64
Vm 8.0
Mac OS X Lion 10.7.2 VMware Image
Xcode 4.3
IOS SDK 5.0

Ipad2 5.1.1

要利用CoreLocation，必須在frameworks裏面加入“CoreLocation.framework”。在最新版本的Xcode（4.x）中加入新的framework步驟如下：
單擊項目的target =>在出來的xcodeproj面板中點擊“Link Binary With Libraries” =>點擊“+”，然後選擇需要的framework即可。
首先建立一個Single View Application工程，然後引入CoreLocation.framework,並在ViewController.h中修改如下：

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>

@interface XViewController : UIViewController
{
    CLLocationManager *locManager;
    
}

@property (retain, nonatomic) IBOutlet UILabel *lonLabel;
@property (retain, nonatomic) IBOutlet UILabel *latLabel;
@property (retain, nonatomic) CLLocationManager *locManager;

- (IBAction)StartLocation:(id)sender;
@end

.m文件的實現如下，具體解釋在代碼註釋中說明

- (void)dealloc {
    [lonLabel release];
    [latLabel release];
    [locManager release];
    [super dealloc];
}

//協議中的方法，作用是每當位置發生更新時會調用的委託方法  
-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation  
{  
    //結構體，存儲位置座標  
    CLLocationCoordinate2D loc = [newLocation coordinate];  
    float longitude = loc.longitude;  
    float latitude = loc.latitude;  
    self.lonLabel.text = [NSString stringWithFormat:@"%f",longitude];  
    self.latLabel.text = [NSString stringWithFormat:@"%f",latitude];  
    
}  

//當位置獲取或更新失敗會調用的方法  
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error  
{  
    NSString *errorMsg = nil;  
    if ([error code] == kCLErrorDenied) {  
        errorMsg = @"訪問被拒絕";  
    }  
    if ([error code] == kCLErrorLocationUnknown) {  
        errorMsg = @"獲取位置信息失敗";  
    }  
    
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Location"   
                                                   message:errorMsg   
                                                  delegate:self   
                                         cancelButtonTitle:@"Cancel"   
                                         otherButtonTitles:@"OtherBtn",nil];  
    [alert show];  
    [alert release];  
}  

- (IBAction)StartLocation:(id)sender {
    //初始化位置管理器  
    locManager = [[CLLocationManager alloc]init];  
    //設置代理  
    locManager.delegate = self;  
    //設置位置經度  
    locManager.desiredAccuracy = kCLLocationAccuracyBest;  
    //設置每隔100米更新位置  
    locManager.distanceFilter = 100;  
    //開始定位服務  
    [locManager startUpdatingLocation];  
    
}