CoreMotionManager的简单使用

根据CoreMotionManager可以获取一些角度，比如拍照时，相机的十字准星与地平线的夹角、手机水平放置时，绕长边抬起的角度（俯仰角）等。

#import "ViewController.h"
 
 
import 
 
 
@interface ViewController ()
 
 
@end
 
 
@implementation ViewController
 
 
 
  
(void)viewDidLoad
 {
 [super viewDidLoad];
 self.view.backgroundColor=[UIColor whiteColor];
 [ViewController getDegress];
 
 
 
 
}
 //各种角度信息
 +(void)getDegress
 {
 CMMotionManager *motionManager = [[CMMotionManager alloc] init];
 if (!motionManager.accelerometerAvailable) {
 NSLog(@"没有加速计");
 }
 //更新频率是10Hz
 motionManager.accelerometerUpdateInterval = 0.1;
 
 
[motionManager startDeviceMotionUpdatesToQueue:[NSOperationQueue mainQueue] withHandler:^(CMDeviceMotion *motion, NSError *error) {
    //地平线夹角
    NSLog(@"aaaaa%.0f",(M_PI_2-atan2(motionManager.deviceMotion.gravity.x, motionManager.deviceMotion.gravity.z))\*180/M_PI);
    //俯仰角
    NSLog(@"bbbbb%.0f",(atan2(motion.gravity.z, motion.gravity.x)+M_PI_2)\*180/M_PI);
}];
 
 
}
 @end