CoreMotion框架的使用
CoreMotion框架十分强大,它不仅将加速度传感器和螺旋仪传感器进行了统一配置和管理,还为我们封装了许多算法,我们可以直接获取到设备的运动状态信息。
1、CoreMotion负责处理的数据
CoreMotion负责处理四种数据,一种是加速度数据,一种是螺旋仪数据,一种是磁感应数据,还有一种是前三种数据通过复杂运算得到的设备的运动数据。几个主要的类如下:
CMAccelerommterData:设备的加速度数据
typedef struct {
double x;
double y;
double z;
} CMAcceleration;
@interface CMAccelerometerData : CMLogItem
{
@private
id _internal;
}
//加速度的数据对象
@property(readonly, nonatomic) CMAcceleration acceleration;
@end
CMGyroData:设备的螺旋仪数据
typedef struct {
double x;
double y;
double z;
} CMRotationRate;
@interface CMGyroData : CMLogItem
{
@private
id _internal;
}
//螺旋仪数据对象
@property(readonly, nonatomic) CMRotationRate rotationRate;
@end
CMMagnetometerData:磁感应信息
typedef struct {
double x;
double y;
double z;
} CMMagneticField;
@interface CMMagnetometerData : CMLogItem
{
@private
id _internal;
}
//磁力对象
@property(readonly, nonatomic) CMMagneticField magneticField;
@end
CMDeviceMotion:设备的运动状态数据
@interface CMDeviceMotion : CMLogItem
{
@private
id _internal;
}
//设备的状态对象
@property(readonly, nonatomic) CMAttitude *attitude;
//设备的角速度
@property(readonly, nonatomic) CMRotationRate rotationRate;
//设备的重力加速度
@property(readonly, nonatomic) CMAcceleration gravity;
//用户嫁给设备的加速度 设备的总加速度为重力加速度叫上用户给的加速度
@property(readonly, nonatomic) CMAcceleration userAcceleration;
//设备的磁场矢量对象
@property(readonly, nonatomic) CMCalibratedMagneticField magneticField NS_AVAILABLE(NA,5_0);
相比之前两个类,这个就比较复杂了,attitude对象中又封装了许多设备的状态属性:
@interface CMAttitude : NSObject <NSCopying, NSSecureCoding>
2、CoreMotion的使用
{
@private
id _internal;
}
//设备的欧拉角roll
@property(readonly, nonatomic) double roll;
//设备的欧拉角pitch
@property(readonly, nonatomic) double pitch;
//设备的欧拉角yaw
@property(readonly, nonatomic) double yaw;
//设备状态的旋转矩阵
@property(readonly, nonatomic) CMRotationMatrix rotationMatrix;
//设备状态的四元数
@property(readonly, nonatomic) CMQuaternion quaternion;
@end
CoreMotion有两种使用方式,一种是我们主动向manager索取数据,一种是通过回调让manager将数据传给回调给我们,这两种方式分别称作pull方式和push方式。
pull方式:
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//创建管理对象
manager= [[CMMotionManager alloc]init];
//开启加速度更新
[manager startAccelerometerUpdates];
//开启螺旋仪更新
[manager startGyroUpdates];
//开启状态更新
[manager startMagnetometerUpdates];
//创建定时器
NSTimer * time = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(updata) userInfo:nil repeats:YES];
time.fireDate = [NSDate distantPast];
}
-(void)updata{
push方式:
//获取数据
NSLog(@"%f,%f,%f\n%f,%f,%f",manager.accelerometerData.acceleration.x,manager.accelerometerData.acceleration.y,manager.accelerometerData.acceleration.z,manager.gyroData.rotationRate.x,manager.gyroData.rotationRate.y,manager.gyroData.rotationRate.z);
}
//创建管理对象
3、CoreMotion的更多属性和方法
manager= [[CMMotionManager alloc]init];
//在当前线程中回调
[manager startAccelerometerUpdatesToQueue:[NSOperationQueue currentQueue] withHandler:^(CMAccelerometerData * _Nullable accelerometerData, NSError * _Nullable error) {
NSLog(@"%f,%f,%f\n%f,%f,%f",manager.accelerometerData.acceleration.x,manager.accelerometerData.acceleration.y,manager.accelerometerData.acceleration.z,manager.gyroData.rotationRate.x,manager.gyroData.rotationRate.y,manager.gyroData.rotationRate.z);
}];
@interface CMMotionManager : NSObject
{
@private
id _internal;
}
//设置加速度传感器更新帧率
@property(assign, nonatomic) NSTimeInterval accelerometerUpdateInterval __TVOS_PROHIBITED;
//加速度传感器是否可用
@property(readonly, nonatomic, getter=isAccelerometerAvailable) BOOL accelerometerAvailable __TVOS_PROHIBITED;
//加速度传感器是否激活
@property(readonly, nonatomic, getter=isAccelerometerActive) BOOL accelerometerActive __TVOS_PROHIBITED;
//加速度传感器数据对象
@property(readonly, nullable) CMAccelerometerData *accelerometerData __TVOS_PROHIBITED;
//pull方式开始更新加速度数据
- (void)startAccelerometerUpdates __TVOS_PROHIBITED;
//push方式更新加速度数据
- (void)startAccelerometerUpdatesToQueue:(NSOperationQueue *)queue withHandler:(CMAccelerometerHandler)handler __TVOS_PROHIBITED;
//停止更新加速度数据
- (void)stopAccelerometerUpdates __TVOS_PROHIBITED;
//螺旋仪传感器刷新帧率
@property(assign, nonatomic) NSTimeInterval gyroUpdateInterval __TVOS_PROHIBITED;
//螺旋仪是否可用
@property(readonly, nonatomic, getter=isGyroAvailable) BOOL gyroAvailable __TVOS_PROHIBITED;
//螺旋仪是否激活
@property(readonly, nonatomic, getter=isGyroActive) BOOL gyroActive __TVOS_PROHIBITED;
//螺旋仪数据
@property(readonly, nullable) CMGyroData *gyroData __TVOS_PROHIBITED;
//pull方式开始更新螺旋仪
- (void)startGyroUpdates __TVOS_PROHIBITED;
//push方式开始更新螺旋仪
- (void)startGyroUpdatesToQueue:(NSOperationQueue *)queue withHandler:(CMGyroHandler)handler __TVOS_PROHIBITED;
//停止更新螺旋仪
- (void)stopGyroUpdates __TVOS_PROHIBITED;
//磁力传感更新帧率
@property(assign, nonatomic) NSTimeInterval magnetometerUpdateInterval NS_AVAILABLE(NA,5_0) __TVOS_PROHIBITED;
//设备磁力传感器是否可用
@property(readonly, nonatomic, getter=isMagnetometerAvailable) BOOL magnetometerAvailable NS_AVAILABLE(NA,5_0) __TVOS_PROHIBITED;
//设备磁力传感器是否激活
@property(readonly, nonatomic, getter=isMagnetometerActive) BOOL magnetometerActive NS_AVAILABLE(NA,5_0) __TVOS_PROHIBITED;
//设备磁力状态数据
@property(readonly, nullable) CMMagnetometerData *magnetometerData NS_AVAILABLE(NA,5_0) __TVOS_PROHIBITED;
//pull方式更新设备磁力状态
- (void)startMagnetometerUpdates NS_AVAILABLE(NA,5_0) __TVOS_PROHIBITED;
//push方式更新设备磁力状态
- (void)startMagnetometerUpdatesToQueue:(NSOperationQueue *)queue withHandler:(CMMagnetometerHandler)handler NS_AVAILABLE(NA,5_0) __TVOS_PROHIBITED;
//停止更新设备状态
- (void)stopMagnetometerUpdates NS_AVAILABLE(NA,5_0) __TVOS_PROHIBITED;
//设备状态更新帧率
@property(assign, nonatomic) NSTimeInterval deviceMotionUpdateInterval __TVOS_PROHIBITED;
//参考器枚举
+ (CMAttitudeReferenceFrame)availableAttitudeReferenceFrames NS_AVAILABLE(NA,5_0) __TVOS_PROHIBITED;
@property(readonly, nonatomic) CMAttitudeReferenceFrame attitudeReferenceFrame NS_AVAILABLE(NA,5_0) __TVOS_PROHIBITED;
//设备运动信息是否可用
@property(readonly, nonatomic, getter=isDeviceMotionAvailable) BOOL deviceMotionAvailable __TVOS_PROHIBITED;
//设备运动信息是否激活
@property(readonly, nonatomic, getter=isDeviceMotionActive) BOOL deviceMotionActive __TVOS_PROHIBITED;
//设备运动信息对象
@property(readonly, nullable) CMDeviceMotion *deviceMotion __TVOS_PROHIBITED;
//pull方式开始刷新运动信息
- (void)startDeviceMotionUpdates __TVOS_PROHIBITED;
//push方式开始刷新运动信息
- (void)startDeviceMotionUpdatesToQueue:(NSOperationQueue *)queue withHandler:(CMDeviceMotionHandler)handler __TVOS_PROHIBITED;
//使用某个参考系
- (void)startDeviceMotionUpdatesUsingReferenceFrame:(CMAttitudeReferenceFrame)referenceFrame NS_AVAILABLE(NA,5_0) __TVOS_PROHIBITED;
//push方式开始刷新设备运动信息
- (void)startDeviceMotionUpdatesUsingReferenceFrame:(CMAttitudeReferenceFrame)referenceFrame toQueue:(NSOperationQueue *)queue withHandler:(CMDeviceMotionHandler)handler NS_AVAILABLE(NA,5_0) __TVOS_PROHIBITED;
//停止刷新设备运动信息
- (void)stopDeviceMotionUpdates __TVOS_PROHIBITED;
距离传感器的应用
iPhone手机中内置了距离传感器,位置在手机的听筒附近,当我们在打电话的时候靠近听筒,手机的屏幕会自动熄灭,这就靠距离传感器来控制。
在我们开发app时,如果需要,也可以调用距离传感器的一些接口方法。距离传感器的接口十分简单,主要通过通知中心来对距离的改变进行通知。
首先,我们需要开启距离传感器应用:
[UIDevice currentDevice].proximityMonitoringEnabled=YES;
监听距离改变的通知:
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(notice) name:UIDeviceProximityStateDidChangeNotification object:nil];
在回调方法中,我们可以通过下面这个属性来监听距离状态:
-(void)notice{
if ([UIDevice currentDevice].proximityState) {
NSLog(@"近距离");
}else{
NSLog(@"远距离");
}
}