自定义指南针的实现

#import "ViewController.h"

#import <CoreLocation/CoreLocation.h>

 

@interface ViewController ()<CLLocationManagerDelegate>

 

@property(nonatomic,strong)CLLocationManager*manager;

@property (weak, nonatomic) IBOutlet UIImageView *imageW;

 

 

 

@end

 

@implementation ViewController

 

-(CLLocationManager*)manager

{

    if (_manager==nil) {

        _manager=[[CLLocationManager alloc]init];

    }

    return _manager;

}

 

- (void)viewDidLoad {

    [super viewDidLoad];

    self.manager.delegate=self;

    //判断ios7 或者8

    if([[UIDevice currentDevice].systemVersion doubleValue]>8.0)

    {

        //[self.manager requestWhenInUseAuthorization];

        [self.manager requestAlwaysAuthorization];

    }

    [self.manager stopUpdatingHeading];

}

 

-(void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading

{

    CGFloat angle=newHeading.magneticHeading*M_PI/180;

    

    

    //旋转图片

    self.imageW.transform =CGAffineTransformMakeRotation(-angle);

    

    

    

}

 

 

 

 

 

 

 

@end