iOS实现“摇一摇”与“扫一扫”功能示例代码

“摇一摇”功能的实现：

iPhone对 “摇一摇”有很好的支持，总体说来就两步：

在视图控制器中打开接受“摇一摇”的开关;

 - (void)viewDidLoad {
  // 设置允许摇一摇功能
  [UIApplication sharedApplication].applicationSupportsShakeToEdit = YES;
  // 并让自己成为第一响应者
  [self becomeFirstResponder];
}

在“摇一摇”触发的制定的方法中实现需要实现的功能（”摇一摇“检测方法）。

// 摇一摇开始摇动 
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event { 
  NSLog(@"开始摇动");
  //添加“摇一摇”动画
  [self addAnimations];
  //音效
  AudioServicesPlaySystemSound (soundID); 
  return; 
} 

// “摇一摇”取消摇动 
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event { 
  NSLog(@"取消摇动"); 
  return; 
} 

// “摇一摇”摇动结束 
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event { 
  if (event.subtype == UIEventSubtypeMotionShake) { // 判断是否是摇动结束 
    NSLog(@"摇动结束"); 
  } 
  return; 
} 

”摇一摇“的动画效果：

- (void)addAnimations {
  //音效
  AudioServicesPlaySystemSound (soundID);
  //让上面图片的上下移动
  CABasicAnimation *translation2 = [CABasicAnimation animationWithKeyPath:@"position"];
  translation2.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
  translation2.fromValue = [NSValue valueWithCGPoint:CGPointMake(160, 115)];
  translation2.toValue = [NSValue valueWithCGPoint:CGPointMake(160, 40)];
  translation2.duration = 0.4;
  translation2.repeatCount = 1;
  translation2.autoreverses = YES;

  //让下面的图片上下移动
  CABasicAnimation *translation = [CABasicAnimation animationWithKeyPath:@"position"];
  translation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
  translation.fromValue = [NSValue valueWithCGPoint:CGPointMake(160, 345)];
  translation.toValue = [NSValue valueWithCGPoint:CGPointMake(160, 420)];
  translation.duration = 0.4;
  translation.repeatCount = 1;
  translation.autoreverses = YES;

  [imgDown.layer addAnimation:translation forKey:@"translation"];
  [imgUp.layer addAnimation:translation2 forKey:@"translation2"];  
}

注意：在模拟器中运行时，可以通过「Hardware」-「Shake Gesture」来测试「摇一摇」功能。如下:

“扫一扫”功能的实现：

基于AVCaptureDevice做的二维码扫描器，基本步骤如下：

初始化相机，生成扫描器

 设置参数

 - (void)setupCamera {

  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

    _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    _input = [AVCaptureDeviceInput deviceInputWithDevice:_device error:nil];

    _output = [[AVCaptureMetadataOutput alloc]init];
    [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

    _session = [[AVCaptureSession alloc]init];
    [_session setSessionPreset:AVCaptureSessionPresetHigh];
    if ([_session canAddInput:self.input])
    {
      [_session addInput:self.input];
    }

    if ([_session canAddOutput:self.output])
    {
      [_session addOutput:self.output];
    }

    // 条码类型 AVMetadataObjectTypeQRCode
    _output.metadataObjectTypes = [NSArray arrayWithObjects:AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code, AVMetadataObjectTypeQRCode, nil];

    dispatch_async(dispatch_get_main_queue(), ^{
      //更新界面
      _preview =[AVCaptureVideoPreviewLayer layerWithSession:self.session];
      _preview.videoGravity = AVLayerVideoGravityResizeAspectFill;
      _preview.frame = CGRectMake(0, 0, CGRectGetWidth(self.centerView.frame), CGRectGetHeight(self.centerView.frame));
      [self.centerView.layer insertSublayer:self.preview atIndex:0];
      [_session startRunning];
    });
  });
}

在viewWillAppear和viewWillDisappear里对session做优化（timer是个扫描动画的计时器）

 - (void)viewWillAppear:(BOOL)animated {
  [super viewWillAppear:animated];

  if (_session && ![_session isRunning]) {
    [_session startRunning];
  }
  timer = [NSTimer scheduledTimerWithTimeInterval:0.02 target:self selector:@selector(scanningAnimation) userInfo:nil repeats:YES];
  [self setupCamera];
}

 - (void)viewWillDisappear:(BOOL)animated {
  [super viewWillDisappear:animated];
  _count = 0;
  [timer invalidate];
  [self stopReading];
}

处理扫描结果

 - (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {

  NSString *stringValue;
  if ([metadataObjects count] >0){
    AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
    stringValue = metadataObject.stringValue;
    NSLog(@"%@",stringValue);
  }
  [_session stopRunning];
  [timer invalidate];
  _count ++ ;
  [self stopReading];
  if (stringValue && _count == 1) {
    //扫描完成
  }
}

用二维码扫描器扫描自己的二维码：

NSString *url = [NSURL URLWithString:@"html/judgement.html" relativeToURL:[ZXApiClient sharedClient].baseURL].absoluteString;

  if ([stringValue hasPrefix:url]) {
    //如果扫出来的url是自己的域名开头的，那么做如下的处理
  }

最后附上自己完整的源码：

// Created by Ydw on 16/3/15. 
// Copyright © 2016年 IZHUO.NET. All rights reserved. 
//

import “ViewController.h” 
import <AVFoundation/AVFoundation.h>

@interface ViewController () 
{ 
int number; 
NSTimer *timer; 
NSInteger _count; 
BOOL upOrdown; 
AVCaptureDevice *lightDevice; 
}

@property (nonatomic,strong) UIView *centerView;//扫描的显示视图

/** 
* 二维码扫描参数 
*/ 
@property (strong,nonatomic) AVCaptureDevice *device; 
@property (strong,nonatomic) AVCaptureDeviceInput *input; 
@property (strong,nonatomic) AVCaptureMetadataOutput *output; 
@property (strong,nonatomic) AVCaptureSession *session; 
@property (strong,nonatomic) AVCaptureVideoPreviewLayer *preview; 
@property (nonatomic,retain) UIImageView *imageView;//扫描线

(void)setupCamera;
(void)stopReading;
@end 

@implementation ViewController

- (void)viewWillAppear:(BOOL)animated {
  [super viewWillAppear:animated];

  if (_session && ![_session isRunning]) {
    [_session startRunning];
  }
  timer = [NSTimer scheduledTimerWithTimeInterval:0.02 target:self selector:@selector(scanningAnimation) userInfo:nil repeats:YES];
  [self setupCamera];
}

- (void)viewDidLoad {
  [super viewDidLoad];

  self.view.backgroundColor = [UIColor clearColor];
  self.automaticallyAdjustsScrollViewInsets = NO;

  _count = 0 ;
  //初始化闪光灯设备
  lightDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
  //扫描范围
  _centerView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, CGRectGetWidth(self.view.frame), CGRectGetHeight(self.view.frame))];
  _centerView.backgroundColor = [UIColor clearColor];
  [self.view addSubview:_centerView];

  //扫描的视图加载
  UIView *scanningViewOne = [[UIView alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 120)];
  scanningViewOne.backgroundColor= [[UIColor blackColor] colorWithAlphaComponent:0.4];
  [self.centerView addSubview:scanningViewOne];

  UIView *scanningViewTwo = [[UIView alloc]initWithFrame:CGRectMake(0, 120, (self.view.frame.size.width-300)/2, 300)];
  scanningViewTwo.backgroundColor= [[UIColor blackColor] colorWithAlphaComponent:0.4];
  [self.centerView addSubview:scanningViewTwo];

  UIView *scanningViewThree = [[UIView alloc]initWithFrame:CGRectMake(CGRectGetWidth(self.view.frame)/2+150, 120, (self.view.frame.size.width-300)/2, 300)];
  scanningViewThree.backgroundColor= [[UIColor blackColor] colorWithAlphaComponent:0.4];
  [self.centerView addSubview:scanningViewThree];

  UIView *scanningViewFour = [[UIView alloc]initWithFrame:CGRectMake(0, 420, self.view.frame.size.width,CGRectGetHeight(self.view.frame)- 420)];
  scanningViewFour.backgroundColor= [[UIColor blackColor] colorWithAlphaComponent:0.4];
  [self.centerView addSubview:scanningViewFour];


  UILabel *labIntroudction= [[UILabel alloc] initWithFrame:CGRectMake(15, 430, self.view.frame.size.width - 30, 30)];
  labIntroudction.backgroundColor = [UIColor clearColor];
  labIntroudction.textAlignment = NSTextAlignmentCenter;
  labIntroudction.textColor = [UIColor whiteColor];
  labIntroudction.text = @"请将企业邀请码放入扫描框内";
  [self.centerView addSubview:labIntroudction];

  UIButton *openLight = [[UIButton alloc]initWithFrame:CGRectMake(CGRectGetWidth(self.view.frame)/2-25, 470, 50, 50)];
  [openLight setImage:[UIImage imageNamed:@"灯泡"] forState:UIControlStateNormal];
  [openLight setImage:[UIImage imageNamed:@"灯泡2"] forState:UIControlStateSelected];
  [openLight addTarget:self action:@selector(openLightWay:) forControlEvents:UIControlEventTouchUpInside];
  [self.centerView addSubview:openLight];

  //扫描线
  _imageView = [[UIImageView alloc] initWithFrame:CGRectMake(CGRectGetWidth(self.view.frame)/2-110, 130, 220, 5)];
  _imageView.image = [UIImage imageNamed:@"scanning@3x"];
  [self.centerView addSubview:_imageView];
}

- (void)viewWillDisappear:(BOOL)animated {
  _count= 0;
  [timer invalidate];
  [self stopReading];
}

pragma mark -- 设置参数
- (void)setupCamera {

  dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

    _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

    _input = [AVCaptureDeviceInput deviceInputWithDevice:_device error:nil];

    _output = [[AVCaptureMetadataOutput alloc]init];
    [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

    _session = [[AVCaptureSession alloc]init];
    [_session setSessionPreset:AVCaptureSessionPresetHigh];
    if ([_session canAddInput:self.input])
    {
      [_session addInput:self.input];
    }

    if ([_session canAddOutput:self.output])
    {
      [_session addOutput:self.output];
    }

    // 条码类型 AVMetadataObjectTypeQRCode
    _output.metadataObjectTypes = [NSArray arrayWithObjects:AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code, AVMetadataObjectTypeQRCode, nil];

    dispatch_async(dispatch_get_main_queue(), ^{
      //更新界面
      _preview =[AVCaptureVideoPreviewLayer layerWithSession:self.session];
      _preview.videoGravity = AVLayerVideoGravityResizeAspectFill;
      _preview.frame = CGRectMake(0, 0, CGRectGetWidth(self.centerView.frame), CGRectGetHeight(self.centerView.frame));
      [self.centerView.layer insertSublayer:self.preview atIndex:0];
      [_session startRunning];
    });
  });
}

//扫描动画
- (void)scanningAnimation {
  if (upOrdown == NO) {
    number ++;
    _imageView.frame = CGRectMake(CGRectGetWidth(self.view.frame)/2-115, 130+2*number, 230, 5);
    if (2*number == 280) {
      upOrdown = YES;
    }
  }
  else {
    number --;
    _imageView.frame = CGRectMake(CGRectGetWidth(self.view.frame)/2-115, 130+2*number, 230, 5);
    if (number == 0) {
      upOrdown = NO;
    }
  }
}

- (void)stopReading {
  [_session stopRunning];
  _session = nil;
  [_preview removeFromSuperlayer];
  [timer invalidate];
  timer = nil ;
}

-(void)openLightWay:(UIButton *)sender {

  if (![lightDevice hasTorch]) {//判断是否有闪光灯
    UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"当前设备没有闪光灯，不能提供手电筒功能" message:nil preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:nil];
    [alert addAction:sureAction];
    [self presentViewController:alert animated:YES completion:nil];
    return;
  }
  sender.selected = !sender.selected;
  if (sender.selected == YES) {
    [lightDevice lockForConfiguration:nil];
    [lightDevice setTorchMode:AVCaptureTorchModeOn];
    [lightDevice unlockForConfiguration];
  }
  else
  {
    [lightDevice lockForConfiguration:nil];
    [lightDevice setTorchMode: AVCaptureTorchModeOff];
    [lightDevice unlockForConfiguration];
  }
}

pragma mark -- AVCaptureMetadataOutputObjectsDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {

  NSString *stringValue;
  if ([metadataObjects count] >0){
    AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
    stringValue = metadataObject.stringValue;
    NSLog(@"%@",stringValue);
  }
  [_session stopRunning];
  [timer invalidate];
  _count ++ ;
  [self stopReading];
  if (stringValue && _count == 1) {
    //扫描完成
  }
}

- (void)didReceiveMemoryWarning {
  [super didReceiveMemoryWarning];
  // Dispose of any resources that can be recreated.
}

@end

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