iPhone开发之CoreLocation定位效能(6)

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：

#import &lt;UIKit/UIKit.h&gt;#import &lt;CoreLocation/CoreLocation.h&gt;@interface ViewController : UIViewController&lt;CLLocationManagerDelegate&gt;{    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：

#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：

iPhone开发之CoreLocation定位效能(6)

iPhone开发之CoreLocation定位效能(6)

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