iOS 仿百度外卖-首页重力感应的实例
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2023-12-22 09:45:10
今天带来的是仿百度外卖首页的重力感应..(由于只能真机测试,手里测试机只有5s,所以有些地方并没有适配其他机型,需要的还需要根据真机自行适配)
来简单说下实现吧,之前...
今天带来的是仿百度外卖首页的重力感应..(由于只能真机测试,手里测试机只有5s,所以有些地方并没有适配其他机型,需要的还需要根据真机自行适配)
来简单说下实现吧,之前重力感应都是用uiaccelerometer实现的,但是,好像是从ios 4 以后,这个方法就废弃了,它被直接封装到了coremotion框架中,所以现在有关重力感应,加速计什么的都需要通过coremotion框架实现,这也算是苹果对于重力感应的整合吧.本文对coremotion框架只是进行了简单的使用,想要更深的使用,还是请自行 google(百度上的文档非常少).
好了.下面就是实现代码
(注意这里需要导入系统框架coremotion.framework)
// // viewcontroller.m // 仿百度外卖首页-重力感应 // // created by amydom on 16/12/5. // copyright © 2016年 amydom. all rights reserved. // #import "viewcontroller.h" #import <coremotion/coremotion.h> @interface viewcontroller ()<uiscrollviewdelegate>{ nstimeinterval updateinterval; cgfloat setx;//scroll的动态偏移量 } @property (nonatomic,strong) cmmotionmanager *mmanager; @property (nonatomic , strong)uiscrollview *myscrollview; @property (nonatomic , assign)cgfloat offsetx;//初始偏移量 @property (nonatomic , assign)nsinteger offset; @end @implementation viewcontroller - (void)viewdidappear:(bool)animated_{ [super viewdidappear:animated_]; //在界面已经显示后在调用方法(优化) [self startupdateaccelerometerresult:0]; } - (void)viewdidload { [super viewdidload]; self.view.backgroundcolor = [uicolor whitecolor]; [self createview]; } - (void)createview{ //collectionview uicollectionviewflowlayout *flowlayout = [[uicollectionviewflowlayout alloc]init]; uicollectionview *mycollection = [[uicollectionview alloc]initwithframe:[uiscreen mainscreen].bounds collectionviewlayout:flowlayout]; mycollection.backgroundcolor = [uicolor whitecolor]; [self.view addsubview:mycollection]; _myscrollview = [[uiscrollview alloc]initwithframe:cgrectmake(0, 22, self.view.frame.size.width, 100)]; _myscrollview.backgroundcolor = [uicolor lightgraycolor]; _myscrollview.delegate = self; [self.view addsubview:_myscrollview]; for (int i = 0; i < 8; i ++) { nsstring *name = [nsstring stringwithformat:@"%d.jpg",i + 1]; uiimageview *image = [[uiimageview alloc]initwithframe:cgrectmake(5 + 885 * i, 10, 80, 80)]; image.image = [uiimage imagenamed:name]; image.backgroundcolor = [uicolor orangecolor]; image.layer.maskstobounds = yes; image.layer.cornerradius = 40; [_myscrollview addsubview:image]; //偏移量为最后 image 的 frame + origin _myscrollview.contentsize = cgsizemake (image.frame.size.width + image.frame.origin.x, 10); } } //手指触碰时 - (void)scrollviewwillbegindragging:(uiscrollview *)scrollview{ _offsetx = scrollview.contentoffset.x; [self stopupdate]; } - (void)scrollviewdidscroll:(uiscrollview *)scrollview{ //优化处理 setx = scrollview.contentoffset.x; _offset = scrollview.contentoffset.x - _offsetx; if (_offset > 0) { //left }else{ //right } } //手指离开时 - (void)scrollviewdidenddragging:(uiscrollview *)scrollview willdecelerate:(bool)decelerate{ [self startupdateaccelerometerresult:0]; } #pragma mark - 重力感应 - (cmmotionmanager *)mmanager { if (!_mmanager) { updateinterval = 1.0/15.0; _mmanager = [[cmmotionmanager alloc] init]; } return _mmanager; } //开始 - (void)startupdateaccelerometerresult:(void (^)(nsinteger))result { if ([self.mmanager isaccelerometeravailable] == yes) { //回调会一直调用,建议获取到就调用下面的停止方法,需要再重新开始,当然如果需求是实时不间断的话可以等离开页面之后再stop [self.mmanager setaccelerometerupdateinterval:updateinterval]; [self.mmanager startaccelerometerupdatestoqueue:[nsoperationqueue currentqueue] withhandler:^(cmaccelerometerdata *accelerometerdata, nserror *error) { double x = accelerometerdata.acceleration.x; double y = accelerometerdata.acceleration.y; if (fabs(y) >= fabs(x)) {//前后 if (y >= 0){ //down } else{ //portrait } } else { //左右 if (x >= 0){ setx += 10; if (setx <= 360) { //由于以10为单位改变 contentoffset, 会出现顿的现象,加上动画就可解决这个问题 [uiview animatewithduration:0.1 animations:^{ _myscrollview.contentoffset = cgpointmake(setx, 0); }]; //模仿 scroll 的回弹效果 if (setx == 360) { [uiview animatewithduration:0.5 animations:^{ _myscrollview.contentoffset = cgpointmake(setx + 50, 0); } completion:^(bool finished) { [uiview animatewithduration:0.5 animations:^{ _myscrollview.contentoffset = cgpointmake(setx , 0); }]; }]; } }else{ setx = 360; } }else{ setx -= 10; if (setx >= 0) { [uiview animatewithduration:0.1 animations:^{ _myscrollview.contentoffset = cgpointmake(setx, 0); }]; //模仿 scroll 的回弹效果 if (setx == 0) { [uiview animatewithduration:0.5 animations:^{ _myscrollview.contentoffset = cgpointmake(setx - 50, 0); } completion:^(bool finished) { [uiview animatewithduration:0.5 animations:^{ _myscrollview.contentoffset = cgpointmake(setx, 0); }]; }]; } }else{ setx = 0; } } } }]; } } //停止感应方法 - (void)stopupdate { if ([self.mmanager isaccelerometeractive] == yes) { [self.mmanager stopaccelerometerupdates]; } } //离开页面后停止(移除 mmanager) - (void)dealloc { //制空,防止野指针 _mmanager = nil; } - (void)didreceivememorywarning { [super didreceivememorywarning]; // dispose of any resources that can be recreated. } @end
到这里,就可以进行真机测试了..
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