版本記錄

前言

??我們的app很多都需要獲取使用者的動作古今、方向以及其他和方位或者位置有關的參數(shù)，在ios中對應的框架就是CoreMotion娇钱，而在硬件對應的就是集成的加速計和陀螺儀柳畔。這幾篇我們就從基礎原理理論出發(fā)，講一下相關的知識钾麸。關于這個框架的了解感興趣的可以看這幾篇。
1. CoreMotion框架（一）—— 基礎理論
2. CoreMotion框架（二）—— 利用加速度計獲取設備的方向

功能要求

利用陀螺儀獲取設備的方向炕桨。

功能實現(xiàn)

??同利用加速度計獲取設備的方向一樣饭尝，利用陀螺儀獲取數(shù)據(jù)同樣也存在pull和push兩種情況。這兩種方式的異同點我就不說了献宫，具體可以參考我前面寫的那篇加速度計獲取設備的方向钥平。

push

下面我們就看一下push方式的代碼。

1. JJGyroPushVC.m

#import "JJGyroPushVC.h"
#import <CoreMotion/CoreMotion.h>

@interface JJGyroPushVC ()

@property (nonatomic, strong) CMMotionManager *manager;


@end

@implementation JJGyroPushVC

#pragma mark - Override Base Function

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor greenColor];
    
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    self.manager = [[CMMotionManager alloc] init];
    self.manager.gyroUpdateInterval = 1.0/30;
    if ([self.manager isGyroAvailable]) {
        if (![self.manager isGyroActive]) {
            [self.manager startGyroUpdatesToQueue:queue withHandler:^(CMGyroData * _Nullable gyroData, NSError * _Nullable error) {
                
                //每秒變化的弧度遵蚜，符合右手定則
                CGFloat x = gyroData.rotationRate.x;
                CGFloat y = gyroData.rotationRate.y;
                CGFloat z = gyroData.rotationRate.z;
                
                NSLog(@"x = %lf, y = %lf, z = %lf",x, y, z);
            }];
        }
    }
}

@end

下面我們看一下輸出結(jié)果帖池。

2017-08-05 22:20:14.368629+0800 JJOC[7836:3048233] x = 0.010673, y = -0.021204, z = 0.001318
2017-08-05 22:20:14.399169+0800 JJOC[7836:3048129] x = 0.010674, y = -0.022264, z = 0.001327
2017-08-05 22:20:14.428550+0800 JJOC[7836:3048233] x = 0.012812, y = -0.022258, z = 0.000276
2017-08-05 22:20:14.488608+0800 JJOC[7836:3048129] x = 0.008549, y = -0.022260, z = 0.000249
2017-08-05 22:20:14.518637+0800 JJOC[7836:3048233] x = 0.011745, y = -0.021198, z = 0.000260
2017-08-05 22:20:14.578544+0800 JJOC[7836:3048129] x = 0.009609, y = -0.022265, z = 0.001321
2017-08-05 22:20:14.608607+0800 JJOC[7836:3048233] x = 0.010673, y = -0.021204, z = 0.001318
2017-08-05 22:20:14.638713+0800 JJOC[7836:3048129] x = 0.010680, y = -0.022259, z = 0.000262
2017-08-05 22:20:14.698805+0800 JJOC[7836:3048233] x = 0.013879, y = -0.023318, z = 0.000292
2017-08-05 22:20:14.728615+0800 JJOC[7836:3048129] x = 0.009615, y = -0.022259, z = 0.000256
2017-08-05 22:20:14.788792+0800 JJOC[7836:3048233] x = 0.010680, y = -0.022259, z = 0.000262
2017-08-05 22:20:14.818813+0800 JJOC[7836:3048129] x = 0.009613, y = -0.021199, z = 0.000246
2017-08-05 22:20:14.878883+0800 JJOC[7836:3048233] x = 0.010674, y = -0.022264, z = 0.001327
2017-08-05 22:20:14.908880+0800 JJOC[7836:3048129] x = 0.009615, y = -0.022259, z = 0.000256
2017-08-05 22:20:14.938906+0800 JJOC[7836:3048233] x = 0.012814, y = -0.024378, z = 0.000294
2017-08-05 22:20:14.998943+0800 JJOC[7836:3048129] x = 0.005342, y = -0.019086, z = 0.001266
2017-08-05 22:20:15.029091+0800 JJOC[7836:3048233] x = 0.013873, y = -0.023323, z = 0.001357
2017-08-05 22:20:15.089012+0800 JJOC[7836:3048129] x = 0.010676, y = -0.023324, z = 0.001337
2017-08-05 22:20:15.118899+0800 JJOC[7836:3048233] x = 0.011748, y = -0.024379, z = 0.000288

pull

下面我們就看一下pull的方式。

直接看代碼吧吭净。

1. JJGyroPullVC.m

#import "JJGyroPullVC.h"
#import <CoreMotion/CoreMotion.h>

@interface JJGyroPullVC ()

@property (nonatomic, assign) CMRotationRate rotationRate;
@property (nonatomic, strong) CMMotionManager *manager;


@end

@implementation JJGyroPullVC

#pragma mark - Override Base Function

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor greenColor];
    
    self.manager = [[CMMotionManager alloc] init];
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    if ([self.manager isGyroAvailable]) {
            [self.manager startGyroUpdates];
            self.rotationRate = self.manager.gyroData.rotationRate;
            [self startUpdate];
    }
}

#pragma mark - Object Private Function

- (void)startUpdate
{
    //每秒變化的弧度睡汹，符合右手定則
    CGFloat x = self.rotationRate.x;
    CGFloat y = self.rotationRate.y;
    CGFloat z = self.rotationRate.z;
    
    NSLog(@"x = %lf, y = %lf, z = %lf",x, y, z);
}

@end

下面看輸出結(jié)果

2017-08-05 23:15:26.294232+0800 JJOC[7846:3054718] x = 0.226450, y = -0.247746, z = -0.042202
2017-08-05 23:15:26.925388+0800 JJOC[7846:3054718] x = 0.275163, y = -0.208465, z = 0.588230
2017-08-05 23:15:27.646075+0800 JJOC[7846:3054718] x = 1.572780, y = -0.181166, z = -0.281448
2017-08-05 23:15:27.927991+0800 JJOC[7846:3054718] x = 0.182105, y = -0.206188, z = -0.513569
2017-08-05 23:15:28.109596+0800 JJOC[7846:3054718] x = 0.428629, y = -0.804868, z = 0.511360
2017-08-05 23:15:28.361899+0800 JJOC[7846:3054718] x = 0.593156, y = -0.215569, z = 0.134465
2017-08-05 23:15:28.627982+0800 JJOC[7846:3054718] x = 0.176530, y = -0.114000, z = -0.292897
2017-08-05 23:15:28.877916+0800 JJOC[7846:3054718] x = -0.080725, y = 0.066879, z = -0.450517

后記

未完，待續(xù)~~~

冰雪