无涯教程-OC - 位置操作

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只要用户允许应用程序在核心位置框架的帮助下访问信息,无涯教程就可以在iOS中轻松找到用户的当前位置。

位置处理步骤

步骤1 - 创建一个基于View的简单应用程序。

步骤2 - 选择您的项目文件,然后选择目标,然后添加CoreLocation.framework,如下所示-

iOS Tutorial

步骤3 - 在 ViewController.xib 中添加两个标签,并创建ibOutlets,分别将标签命名为 latitudeLabel 和 longitudeLabel 。

步骤4 - 通过选择File→New→File...→Object C Class创建一个新文件,然后单击下一步。

步骤5 - 将类命名为 LocationHandler ,将"sub class of"作为NSObject。

步骤6 - 选择创建。

步骤7 - 如下更新 LocationHandler.h -

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

@protocol LocationHandlerDelegate <NSObject>

@required -(void) didUpdateToLocation:(CLLocation)newLocation fromLocation:(CLLocation)oldLocation; @end

@interface LocationHandler : NSObject<CLLocationManagerDelegate> { CLLocationManager *locationManager; } @property(nonatomicstrong) id<LocationHandlerDelegate> delegate;

+(id)getSharedInstance; -(void)startUpdating; -(void) stopUpdating;

@end

步骤8 - 如下更新 LocationHandler.m -

#import "LocationHandler.h"
static LocationHandler *DefaultManager = nil;

@interface LocationHandler()

-(void)initiate;

@end

@implementation LocationHandler

+(id)getSharedInstance{ if (!DefaultManager) { DefaultManager = [[self allocWithZone:NULL]init]; [DefaultManager initiate]; } return DefaultManager; }

-(void)initiate { locationManager = [[CLLocationManager alloc]init]; locationManager.delegate = self; }

-(void)startUpdating{ [locationManager startUpdatingLocation]; }

-(void) stopUpdating { [locationManager stopUpdatingLocation]; }

-(void)locationManager:(CLLocationManager )manager didUpdateToLocation: (CLLocation )newLocation fromLocation:(CLLocation *)oldLocation { if ([self.delegate respondsToSelector:@selector (didUpdateToLocation:fromLocation:)]) { [self.delegate didUpdateToLocation:oldLocation fromLocation:newLocation]; } } @end

步骤9 - 如下更新 ViewController.h ,在其中无涯教程实现了 LocationHandler委托并创建两个ibOutlet-

#import <UIKit/UIKit.h>
#import "LocationHandler.h"

@interface ViewController : UIViewController<LocationHandlerDelegate> { IBOutlet UILabel latitudeLabel; IBOutlet UILabel longitudeLabel; } @end

步骤10 - 如下更新 ViewController.m -

#import "ViewController.h"

@interface ViewController () @end

@implementation ViewController

- (void)viewDidLoad { [super viewDidLoad]; [[LocationHandler getSharedInstance]setDelegate:self]; [[LocationHandler getSharedInstance]startUpdating]; }

- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; //Dispose of any resources that can be recreated. }

-(void)didUpdateToLocation:(CLLocation )newLocation fromLocation:(CLLocation )oldLocation { [latitudeLabel setText:[NSString stringWithFormat: @"Latitude: %f"newLocation.coordinate.latitude]]; [longitudeLabel setText:[NSString stringWithFormat: @"Longitude: %f"newLocation.coordinate.longitude]]; } @end

运行应用程序时,将获得以下输出-

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参考链接

www.learnfk.com/ios/ios-loc…