iPhone开发之CoreLocation定位功能(6)

学了iPhone的CoreLocation之后，再回想Android的定位开发，真是省事了不少，iPhone对定位功能开发这一模块封装的很好，只需几步，便可以获取到设备所在的位置等多项参数！
        1.启动XCode4.3.2,单击菜单项File->New->Project...，以Sigle View Application模板新建项目，并命名为WhereAmI：
       
        2.单击ViewControler.h头文件，因为CoreLocation框架并不属于UIKit框架，所以需要另外引入，并添加协议：
[plain] 
#import <UIKit/UIKit.h> 
#import <CoreLocation/CoreLocation.h> 
 
@interface ViewController : UIViewController<CLLocationManagerDelegate> 
{ 
    CLLocationManager *locationManager; 
    CLLocation *startPoint; 
    UILabel *latLabel; 
    UILabel *lonLabel; 
    UILabel *distance; 
} 
 
@property(retain,nonatomic)CLLocationManager *locationManager; 
@property(retain,nonatomic)CLLocation *startPoint; 
 
@property(retain,nonatomic)IBOutlet UILabel *latLabel; 
@property(retain,nonatomic)IBOutlet UILabel *lonLabel; 
@property(retain,nonatomic)IBOutlet UILabel *distance; 
 
@end 

       3.单击ViewControler.m文件，添加以下代码：
[plain]
#import "ViewController.h" 
 
@interface ViewController () 
 
@end 
 
@implementation ViewController 
@synthesize startPoint; 
@synthesize locationManager; 
@synthesize latLabel; 
@synthesize lonLabel; 
@synthesize distance; 
 
- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 
    self.locationManager = [[CLLocationManager alloc]init]; 
    self.locationManager.delegate = self; 
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest; 
    [locationManager startUpdatingLocation]; 
} 
 
- (void)viewDidUnload 
{ 
    [super viewDidUnload]; 
    // Release any retained subviews of the main view. 
} 
 
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{ 
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown); 
} 
 
#pragma mark - 
#pragma mark CLLocationManagerDelegate Methods 
-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 
{ 
    if(startPoint==nil) 
        startPoint = newLocation; 
    //经度     
    NSString *lon = [[NSString alloc]initWithFormat:@"%g",newLocation.coordinate.longitude]; 
    self.lonLabel.text = lon; 
    [lon release]; 
    //纬度     
    NSString *lat = [[NSString alloc]initWithFormat:@"%g",newLocation.coordinate.latitude]; 
    self.latLabel.text = lat; 
    [lat release]; 
    //计算移动距离 
    CLLocationDistance ld = [newLocation distanceFromLocation:startPoint]; 
    NSString *distanceString = [[NSString alloc]initWithFormat:@"%gm",ld]; 
    self.distance.text = distanceString; 
    [distanceString release]; 
} 
 
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error 
{ 
    NSString *errorType = (error.code == kCLErrorDenied)?@"Access Denied":@"Unkown Error"; 
    UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Error getting location" message:errorType delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil]; 
    [alert show]; 
    [alert release]; 
} 
 
@end 
       4.运行，效果如下：

补充：移动开发 , IOS ,

上一个：iPhone开发之应用程序的沙盒(7)
下一个：iPhone开发之UITableView简单应用（5）