位置处理 - 涉及的步骤
步骤 1 - 创建一个简单的基于视图的应用程序。
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 -
步骤 3 - 在中添加两个标签 ViewController.xib 并创建 ibOutlets 将标签命名为 latitudeLabel 和 longitudeLabel 分别。
步骤 4 − 通过选择 File → New → File... 创建一个新文件 → select Objective C class 然后点击下一步。
步骤 5 - 将类命名为 LocationHandler 和 "sub class of" 作为 NSObject。
步骤 6 − 选择创建。
步骤 7 − 更新 LocationHandler.h 如下 -
#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(nonatomic,strong) id<LocationHandlerDelegate> delegate;
+(id)getSharedInstance;
-(void)startUpdating;
-(void) stopUpdating;
@end
步骤 8 − 更新 LocationHandler.m 如下 -
#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 − 更新 ViewController.h 如下我们已经实现了 LocationHandler delegate 并创建两个 ibOutlets -
#import <UIKit/UIKit.h>
#import "LocationHandler.h"
@interface ViewController : UIViewController<LocationHandlerDelegate> {
IBOutlet UILabel *latitudeLabel;
IBOutlet UILabel *longitudeLabel;
}
@end
步骤 10 − 更新 ViewController.m 如下 -
#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