四、卫星定位《苹果iOS实例编程入门教程》

该app为应用的功能为用iPhone 显示你现在的位置

现版本 SDK 8.4 Xcode

运行Xcode 选择 Create a new Xcode project ->Single View Application 命名 WhereAmI

(1) 点击文件夹WhereAmI -> General->Linked Frameworks and Libraries -> "+"->  搜索 CoreLocation.framework ->add

(2)  打开 ViewController.h 文件,加入下面代码

#import <UIKit/UIKit.h>

#import <CoreLocation/CoreLocation.h>

#import <CoreLocation/CLLocationManagerDelegate.h>

@interface ViewController : UIViewController <CLLocationManagerDelegate>{

IBOutlet UITextField *altitude;

IBOutlet UITextField *latitude;

IBOutlet UITextField *longitude;

CLLocationManager *locmanager;

BOOL wasFound;

}

-(IBAction)update:(id)sender;

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

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

@end

(3)  打开 ViewController.m 文件,加入下面代码

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

-(IBAction)update:(id)sender{

locmanager = [[CLLocationManager alloc]init];

[locmanager setDelegate:self];

[locmanager setDesiredAccuracy:kCLLocationAccuracyBest];

locmanager.distanceFilter=10;

NSString *iOSVersion=[UIDevice currentDevice].systemVersion;

//NSLog(@"%@",iOSVersion);

if ((int)iOSVersion >= 8) {

[locmanager requestWhenInUseAuthorization];//使用程序其间允许访问位置数据（iOS8定位需要）

}

[locmanager startUpdatingLocation];

}

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

if(wasFound)return;

wasFound = YES;

CLLocationCoordinate2D loc = [newLocation coordinate];

latitude.text = [NSString stringWithFormat:@"%f",loc.latitude];

longitude.text = [NSString stringWithFormat:@"%f",loc.longitude];

altitude.text = [NSString stringWithFormat:@"%f",newLocation.altitude];

}

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

}

- (void)viewDidLoad {

[super viewDidLoad];

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

}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end

(3) 设置info.plist

点击info.plist，在右侧添加NSLocationWhenInUseUsageDescription和NSLocationAlwaysUsageDescription

将 Value设置为YES

(4) UIView 界面设置

点击Main.storyboard

加入三个Label 在 Attributes 下, Text 内填上"经度"，“纬度”，“海拔”；

加入 三个Text Field用于显示 "经度"，“纬度”，“海拔”；

鼠标右击Text Field控件 移动鼠标在"Referencing Outlets" 后面圆圈上; 圆圈变为(+); 拖动直线连接到"view controller";
放开鼠标选择键出现 "longitude","latitude","altitude"; 对应着"经度"，“纬度”，“海拔”三个Text Field ，分别选上它。

选择： File -> Save

最后在 xCode 选择 Build and then Running

(5)真机调试效果图

本文源于网上博客教程，经过本人修改和测试。原blog地址 http://blog.sina.com.cn/s/blog_5fae23350100e5fi.html