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iOS 仿百度外卖-首页重力感应的实例

时间:2021-02-28 14:30     来源/作者:Amydom

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)

iOS 仿百度外卖-首页重力感应的实例

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)

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//
// 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..

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。

原文链接:http://blog.csdn.net/amydom/article/details/53991332

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