定位-01-定位服務編程

//
//  ViewController.m
//  MyLocation
//
//  Created by JohnFighting on 16/11/2015.
//  Copyright © 2015 john. All rights reserved.
//

#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>

@interface ViewController ()<CLLocationManagerDelegate>
//經度
@property (weak, nonatomic) IBOutlet UITextField *txtLng;
//緯度
@property (weak, nonatomic) IBOutlet UITextField *txtLat;
//高度
@property (weak, nonatomic) IBOutlet UITextField *txtAlt;

@property (nonatomic, strong) CLLocationManager *locationManager;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    //定位服務管理對象初始化

    //創建並初始化locationManager屬性
    self.locationManager = [[CLLocationManager alloc]init];
    //設置定位服務委託對象爲self
    self.locationManager.delegate = self;
    //設置desiredAccuracy屬性(定位精度)
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    //設置distanceFilter屬性, 定義了設備移動後獲得位置信息的最小距離, 單位是米
    self.locationManager.distanceFilter = 1000.0f;

    //彈出用戶授權對話框
    [self.locationManager requestWhenInUseAuthorization];
    [self.locationManager requestAlwaysAuthorization];
}

//在視圖出現時調用
-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    //開始定位, 在視圖控制器的聲明週期方法viewWillAppear:中使用這個方法最爲合適
    [self.locationManager startUpdatingLocation];
}

//在視圖消失時調用
-(void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    //停止定位,
    [self.locationManager stopUpdatingLocation];
}

#pragma mark - CLLocationManagerDelegate
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations{
    CLLocation *currLocation = [locations lastObject];//獲得集合中的最後一個元素, 即爲設備的當前位置

    //coordinate封裝經度和緯度的結構體
    self.txtLat.text = [NSString stringWithFormat:@"%3.5f",currLocation.coordinate.latitude];//獲取設備當前的緯度
    self.txtLng.text = [NSString stringWithFormat:@"%3.5f",currLocation.coordinate.longitude];//獲取設備當前的經度
    self.txtAlt.text = [NSString stringWithFormat:@"%3.5f",currLocation.altitude];//獲取設備當前的高度
}

//定位失敗時調用
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
    NSLog(@"error: %@",error);
}

//授權狀態發生變化時調用
-(void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status{//status是獲得的授權信息, 也可以使用self.locationManager.authorizationStatus = kCLAuthorizationStatusNotDetermined;獲得授權信息
    if (status == kCLAuthorizationStatusAuthorizedAlways) {
        NSLog(@"Authorized");
    }else if (status == kCLAuthorizationStatusAuthorizedWhenInUse){
        NSLog(@"AuthorizedWhenInUse");
    }else if (status == kCLAuthorizationStatusDenied){
        NSLog(@"Denied");
    }else if (status == kCLAuthorizationStatusRestricted){
        NSLog(@"Restricted");
    }else if (status == kCLAuthorizationStatusNotDetermined){
        NSLog(@"Determined");
    }
}

@end