一 概述
加速计的作用 ：用于 检测设备的运动(比如摇晃)。本文介绍相关的两个示例
- 控制小球的移动
- 摇一摇
二 控制小球的移动
2.1 项目描述
- Storyboard上事先放置一个Ball
- 随着手机的移动，小球随着上下左右移动
- 超出边界检测(上下左右边界 )，放置到上下左右边界处
2.2 代码
项目代码
#import "ViewController.h"
#import <CoreMotion/CoreMotion.h>
#import "UIView+Extension.h"
@interface ViewController ()
//小球
@property (strong, nonatomic) IBOutlet UIView *imageBall;
//保存速度
@property(nonatomic,assign) CGPoint velocity;
@property(nonatomic,strong) CMMotionManager *mgr;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self push];
}
//-push方式采集
-(void)push
{
//1-创建CoreMotion管理者
//CMMotionManager *mgr=[[CMMotionManager alloc]init];
self.mgr=[[CMMotionManager alloc]init];
//2-判断加速计 是否可用
if (self.mgr.isAccelerometerActive) {
//3-设置采样时间
self.mgr.accelerometerUpdateInterval=1/30.0;
//4-开始采样
[self.mgr startAccelerometerUpdatesToQueue:[NSOperationQueue mainQueue] withHandler:^(CMAccelerometerData * _Nullable accelerometerData, NSError * _Nullable error) {
//这个block是采集到数据时就会调用
if (error) return;
CMAcceleration acceleration=accelerometerData.acceleration;
NSLog(@"x=%f,y=%f,z=%f",acceleration.x,acceleration.y,acceleration.z);
//移动速度
_velocity.x+=acceleration.x;
_velocity.y-=acceleration.y;
//移动距离
self.imageBall.x+=_velocity.x;
self.imageBall.y+=_velocity.y;
//边界检测
if (self.imageBall.x<=0) {
//矫正小球当前的位置
self.imageBall.x=0;
//超出了屏幕的左边
_velocity.x*=-0.5;
}
if (self.imageBall.y<=0) {
//矫正小球当前的位置
self.imageBall.y=0;
//超出屏幕的顶部
_velocity.y*=-0.5;
}
if (CGRectGetMaxY(self.imageBall.frame)>=self.view.height) {
//矫正小球当前的位置
self.imageBall.y=self.view.height-self.imageBall.height;
//超出屏幕的底部
_velocity.y*=-0.5;
}
if (CGRectGetMaxX(self.imageBall.frame)>=self.view.width) {
//矫正小球当前的位置
self.imageBall.x=self.view.width-self.imageBall.width;
//超出屏幕的右边
_velocity.x*=-0.5;
}
}];
}else{
NSLog(@"加速计不可用");
}
}
@end
UIView+Extension.h
#import <UIKit/UIKit.h>
@interface UIView (Extension)
@property (nonatomic, assign) CGFloat x;
@property (nonatomic, assign) CGFloat y;
@property (nonatomic, assign) CGFloat maxX;
@property (nonatomic, assign) CGFloat maxY;
@property (nonatomic, assign) CGFloat centerX;
@property (nonatomic, assign) CGFloat centerY;
@property (nonatomic, assign) CGFloat width;
@property (nonatomic, assign) CGFloat height;
@property (nonatomic, assign) CGSize size;
@end
UIView+Extension.m
#import "UIView+Extension.h"
@implementation UIView (Extension)
- (void)setX:(CGFloat)x
{
CGRect frame = self.frame;
frame.origin.x = x;
self.frame = frame;
}
- (CGFloat)x
{
return self.frame.origin.x;
}
- (void)setMaxX:(CGFloat)maxX
{
self.x = maxX - self.width;
}
- (CGFloat)maxX
{
return CGRectGetMaxX(self.frame);
}
- (void)setMaxY:(CGFloat)maxY
{
self.y = maxY - self.height;
}
- (CGFloat)maxY
{
return CGRectGetMaxY(self.frame);
}
- (void)setY:(CGFloat)y
{
CGRect frame = self.frame;
frame.origin.y = y;
self.frame = frame;
}
- (CGFloat)y
{
return self.frame.origin.y;
}
- (void)setCenterX:(CGFloat)centerX
{
CGPoint center = self.center;
center.x = centerX;
self.center = center;
}
- (CGFloat)centerX
{
return self.center.x;
}
- (void)setCenterY:(CGFloat)centerY
{
CGPoint center = self.center;
center.y = centerY;
self.center = center;
}
- (CGFloat)centerY
{
return self.center.y;
}
- (void)setWidth:(CGFloat)width
{
CGRect frame = self.frame;
frame.size.width = width;
self.frame = frame;
}
- (CGFloat)width
{
return self.frame.size.width;
}
- (void)setHeight:(CGFloat)height
{
CGRect frame = self.frame;
frame.size.height = height;
self.frame = frame;
}
- (CGFloat)height
{
return self.frame.size.height;
}
- (void)setSize:(CGSize)size
{
// self.width = size.width;
// self.height = size.height;
CGRect frame = self.frame;
frame.size = size;
self.frame = frame;
}
- (CGSize)size
{
return self.frame.size;
}
@end
2.3 预览
暂无设备，自行测试
三摇一摇
3.1 说明
- 在AppDelegate中重写：motionBegan(摇晃开始)、motionEnded(摇晃结束)、motionCancelled(摇晃取消)相关方法
- 安装到手机中，晃动手机，查看方法的执行结果
3.2 代码
#import "AppDelegate.h"
@interface AppDelegate ()
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
// Override point for customization after application launch.
return YES;
}
#pragma mark -摇一摇
//摇一摇开始
-(void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
NSLog(@"%s",__func__);
}
//摇一摇结束
-(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
NSLog(@"%s",__func__);
}
//摇一摇取消
-(void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
NSLog(@"%s",__func__);
}
@end
