#import "ViewController.h"
#import@interface ViewController ()/** 位置管理者 */
@property (nonatomic, strong) CLLocationManager *lM;
///指南针iv
@property (weak, nonatomic) IBOutlet UIImageView *compassView;
@end
@implementation ViewController
- (CLLocationManager *)lM
{
if (!_lM) {
_lM = [[CLLocationManager alloc] init];
_lM.delegate = self;
// 每隔多少度更新一次
_lM.headingFilter = 2;
}
return _lM;
}
- (void)viewDidLoad {
[super viewDidLoad];
// 开始监听设备朝向
[self.lM startUpdatingHeading];
}
#pragma mark - CLLocationManagerDelegate
/**
* 获取到手机朝向时调用
*
* @param manager 位置管理者
* @param newHeading 朝向对象
*/
-(void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading
{
/**
* CLHeading
* magneticHeading : 磁北角度
* trueHeading : 真北角度
*/
NSLog(@"%f", newHeading.magneticHeading);
CGFloat angle = newHeading.magneticHeading;
// 把角度转弧度
CGFloat angleR = angle / 180.0 * M_PI;
// 旋转图片
[UIView animateWithDuration:0.25 animations:^{
self.compassView.transform = CGAffineTransformMakeRotation(-angleR);
}];
}
