最近在做一个有意思的App，需要用到iPhone或者手表的加速度数据
首先引用头文件：
#import <CoreMotion/CoreMotion.h>
使用加速度数据非常简单，首先在当前的ViewController中添加一个strong属性的CMMotionManager实例
@property (nonatomic, strong) CMMotionManager *manager;
之所以强调使用强引用，是因为我一开始就入坑了，如果是局部变量，这个实例就会在数据反馈前被销毁，导致一直没有反馈数据。
然后初始化manager对象：
_manager = [[CMMotionManager alloc] init];
之后判断能不能用加速度传感器（陀螺仪传感器同理）
if (_manager.accelerometerAvailable) {
//可以使用加速度传感器
}
然后，设置加速度数据获取的时间间隔：
_manager.accelerometerUpdateInterval = 0.1;
我们这里取100ms
最后，就是更新数据了：
[_manager startAccelerometerUpdatesToQueue:[[NSOperationQueue alloc]init] withHandler:^(CMAccelerometerData * _Nullable accelerometerData, NSError * _Nullable error) {
CMAcceleration acc = accelerometerData.acceleration;
//NSLog(@"%f,%f,%f",acc.x,acc.y,acc.x);
NSString* x = [NSString stringWithFormat:@"x:%lf",acc.x];
NSString* y = [NSString stringWithFormat:@"y:%lf",acc.y];
NSString* z = [NSString stringWithFormat:@"z:%lf",acc.z];
}];
这就是整个获取的过程，非常简单
附上全部代码:
//
// InterfaceController.m
// WatchMeature WatchKit Extension
//
// Created by Realank on 16/1/25.
// Copyright © 2016年 realank. All rights reserved.
//
#import "InterfaceController.h"
#import <CoreMotion/CoreMotion.h>
#import <WatchConnectivity/WatchConnectivity.h>
#import <HealthKit/HealthKit.h>
@interface InterfaceController()<WCSessionDelegate,HKWorkoutSessionDelegate>
@property (unsafe_unretained, nonatomic) IBOutlet WKInterfaceLabel *xLabel;
@property (unsafe_unretained, nonatomic) IBOutlet WKInterfaceLabel *yLabel;
@property (unsafe_unretained, nonatomic) IBOutlet WKInterfaceLabel *zLabel;
@property (nonatomic, strong) CMMotionManager *manager;
@property (nonatomic, strong) HKHealthStore *healthStore;
@end
@implementation InterfaceController
- (void)awakeWithContext:(id)context {
[super awakeWithContext:context];
HKWorkoutSession *session = [[HKWorkoutSession alloc]initWithActivityType:HKWorkoutActivityTypeRunning locationType:HKWorkoutSessionLocationTypeOutdoor];
session.delegate = self;
[self.healthStore startWorkoutSession:session];
}
- (void)willActivate {
// This method is called when watch view controller is about to be visible to user
[super willActivate];
WCSession* session = [WCSession defaultSession];
session.delegate = self;
[session activateSession];
_manager = [[CMMotionManager alloc] init];
if (_manager.accelerometerAvailable) {
NSLog(@"accelerometerAvailable");
_manager.accelerometerUpdateInterval = 0.1;
__block BOOL sendSuccess = YES;
[_manager startAccelerometerUpdatesToQueue:[[NSOperationQueue alloc]init] withHandler:^(CMAccelerometerData * _Nullable accelerometerData, NSError * _Nullable error) {
CMAcceleration acc = accelerometerData.acceleration;
//NSLog(@"%f,%f,%f",acc.x,acc.y,acc.x);
NSString* x = [NSString stringWithFormat:@"x:%lf",acc.x];
NSString* y = [NSString stringWithFormat:@"y:%lf",acc.y];
NSString* z = [NSString stringWithFormat:@"z:%lf",acc.z];
dispatch_async(dispatch_get_main_queue(), ^{
[self.xLabel setText:x];
[self.yLabel setText:y];
[self.zLabel setText:z];
if (sendSuccess) {
sendSuccess = NO;
NSDictionary *dict = [NSDictionary dictionaryWithObjects:@[x,y,z] forKeys:@[@"x",@"y",@"z"]];
[session sendMessage:dict replyHandler:^(NSDictionary<NSString *,id> * _Nonnull replyMessage) {
sendSuccess = YES;
} errorHandler:^(NSError * _Nonnull error) {
}];
}
});
}];
}
}
- (void)didDeactivate {
// This method is called when watch view controller is no longer visible
[super didDeactivate];
}
- (void)session:(WCSession *)session didReceiveMessage:(NSDictionary<NSString *,id> *)message {
}
- (void)workoutSession:(HKWorkoutSession *)workoutSession didFailWithError:(NSError *)error {
}
@end
