iOS之 CoreMotion 框架

在项目中经常会使用到重力加速度，陀螺仪，最近在一个项目中使用到了CoreMotion 框架，需求是：上下摇摆手机控制智能椅子的角度调节，该项目是使用蓝牙4.0进行通讯的，在iOS 内已经封装好了CoreBluetooth 框架，不过需要iPHone4s 以上的手机，和iPad min 以上的平板电脑才有蓝牙4.0.

今天在这里先记录一下CoreMotion 框架的使用.

主要的类：CMMotionManager , NSOperationQueue.

下面是一个被我封装过的一个类。

项目需要导入CoreMotion.Framework

在.h 文件需要#import <CoreMotion/CoreMotion.h>

.h文件代码:

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#import <Foundation/Foundation.h>
#import <CoreMotion/CoreMotion.h>

typedef enum _MotionDirection {UNKNOWDIRECTION=0,UP,DOWN}MotionDirection;
@interface iCtrlCMManager : NSObject
@property (nonatomic,retain) CMMotionManager * ictrlCMManager;
@property (nonatomic,assign) MotionDirection motionDirection;
+(id)sharedInstance;
-(void)startMotion;
-(void)stopMotion;
@end
.m文件代码:
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#import "iCtrlCMManager.h"

@implementation iCtrlCMManager
#pragma mark -
#pragma mark life cycle
+(id)sharedInstance
{
static iCtrlCMManager *this = nil;
if(!this)
{
this = [[iCtrlCMManager alloc] init];

}

return this;

}

-(id)init
{
self = [super init];
if(self)
{

_ictrlCMManager = [[CMMotionManager alloc] init];

}
return self;
}

-(void)dealloc
{
[_ictrlCMManager release];
[super dealloc];
}

#pragma mark
#pragma mark instance methods
-(void)startMotion
{
_motionDirection = UNKNOWDIRECTION;
if(_ictrlCMManager.accelerometerAvailable)
{
NSOperationQueue *queue = [[[NSOperationQueue alloc] init] autorelease];
_ictrlCMManager.accelerometerUpdateInterval = 1.0/60.0;

__block float y = 0.0;
__block int i = 0;
[_ictrlCMManager startAccelerometerUpdatesToQueue:queue withHandler:^(CMAccelerometerData *accelerometerData, NSError *error) {
if (error)
{
NSLog(@"CoreMotion Error : %@",error);
[_ictrlCMManager stopAccelerometerUpdates];
}
if(i == 0)
{
y = accelerometerData.acceleration.y;

}

i++;
if(fabs(y - accelerometerData.acceleration.y) > 0.4)
{

if(y > accelerometerData.acceleration.y)
{
NSLog(@"UP");
_motionDirection = UP;
}
else
{
NSLog(@"Down");
_motionDirection = DOWN;
}

y = accelerometerData.acceleration.y;

}

}];
}
else
{
NSLog(@"The accelerometer is unavailable");
}
}

-(void)stopMotion
{
_motionDirection = UNKNOWDIRECTION;
[_ictrlCMManager stopAccelerometerUpdates];

}

@end