IOS 监听摇一摇

监听设备摇一摇行为，其做法相对较为简单，利用CMMotionManager监听设备，导入如下库文件：

#import <CoreMotion/CMMotionManager.h>

ShakeUtil.h

#import <UIKit/UIKit.h>

#define SHAKE_NOTIFY @"shake_notify"

@interface ShakeUtil : NSObject

+(instancetype)shake;

// 开始监听摇一摇
-(BOOL)startMonitorShake;

// 停止监听摇一摇
-(void)stopMonitorShake;

@end

ShakeUtil.m

#import <Foundation/Foundation.h>
#import "ShakeUtil.h"
#import <CoreMotion/CMMotionManager.h>

@interface ShakeUtil()

@property(nonatomic, strong) CMMotionManager *motionManager;
// 记录上次发生摇一摇时间，防止频繁响应
@property(nonatomic, strong) NSDate *lastShakeDate;

@end

@implementation ShakeUtil

- (instancetype)init
{
    self = [super init];
    if (self) {
        // 为了防止频繁响应摇一摇，间隔一段时间再进行响应摇一摇
        self.lastShakeDate = [NSDate distantPast];
    }
    return self;
}

+ (instancetype)shake{
    static ShakeUtil *instance;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        instance = [[ShakeUtil alloc] init];
    });
    return instance;
}

- (void)initMotionManager{
    if (!self.motionManager) {
        self.motionManager = [[CMMotionManager alloc] init];
        if (self.motionManager.accelerometerAvailable) {
            self.motionManager.accelerometerUpdateInterval = 0.1;
        }
    }
}

- (BOOL)startMonitorShake{
    [self initMotionManager];
    if (self.motionManager && self.motionManager.accelerometerAvailable) {
        // 正在监听中
        if (!self.motionManager.isAccelerometerActive) {
            [self.motionManager startAccelerometerUpdates];
            [self.motionManager startAccelerometerUpdatesToQueue:[[NSOperationQueue alloc] init] withHandler:^(CMAccelerometerData * _Nullable accelerometerData, NSError * _Nullable error) {
                if (accelerometerData) {
                    CMAcceleration acceleration = accelerometerData.acceleration;
                    // 综合x、y两个方向的加速度，当综合加速度大于2.5时，就响应摇一摇
                    double accelerameter = sqrt(pow(acceleration.x, 2) + pow(acceleration.y, 2));
                    if (accelerameter > 2.5) {
                        // 响应间隔时间设定为：1秒
                        NSDate *curDate = [NSDate date];
                        if ([curDate timeIntervalSinceDate:self.lastShakeDate] < 1) {
                            self.lastShakeDate = curDate;
                            return;
                        }
                        self.lastShakeDate = curDate;
                        [[NSNotificationCenter defaultCenter] postNotificationName:SHAKE_NOTIFY object:nil];
                    }
                }
            }];
        }
        return YES;
    }
    return NO;
}

- (void)stopMonitorShake{
    if (self.motionManager) {
        [self.motionManager stopAccelerometerUpdates];
        self.motionManager = nil;
    }
}

@end