iOS-仿微信扫一扫、长按识别二维码，以及一句话生成二维码

作者: 东方诗空 | 来源:发表于2016-11-10 22:51 被阅读3865次

iOS-仿微信扫一扫、长按识别二维码，以及一句话生成二维码
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二维码分享跳转的配置与实现
2017年中茶寿眉_茶寿茶_
微信小程序研究

1、二维码简介
在iOS中二维码的实质是一个字符串，一般用于制作名片，手机电商购物链家、微信扫一扫，微信支付，QQ加好友，以及移动支付等。其中用的最广的当然是大家熟知的支付宝，微信和QQ了。既然二维码用途这么广，很多APP里面都或多或少有二维码的存在，那么下面就扫一扫二维码，长按识别二维码，以及生成二维码从无到有的过程，和遇到的坑分享给大家。

2、进入主题
在一定的程度之后，相信大家都有封装的思想，那么本文有几个分装介绍给大家：
JWDQRCodeViewController.h 扫一扫控制器分装
JWDPreView.h 扫一扫动画界面封装
JWDCreatQRCodeView.h 生成二维码封装
下面就这三个类进行介绍

3、JWDQRCodeViewController 扫一扫控制器分装

JWDQRCodeViewController.h
.h 没什么可说的，给外界的接口

#import <UIKit/UIKit.h>

@interface JWDQRCodeViewController : UIViewController
- (instancetype)initWithFrame:(CGRect)frame;
@end

JWDQRCodeViewController.m
导入相应的头文件，必须的变量
其中SafariServices/SafariServices.h框架用于url跳转控制器，是iOS9之后的新特性，可以方便打开相应的网页界面。

#import "JWDQRCodeViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "JWDPreView.h"
#import <SafariServices/SafariServices.h>

@interface JWDQRCodeViewController ()<AVCaptureMetadataOutputObjectsDelegate>
@property(nonatomic, strong)AVCaptureDeviceInput        *deviceInput;//!< 摄像头输入
@property(nonatomic, strong)AVCaptureMetadataOutput     *metadataOutput;//!< 输出
@property(nonatomic, strong)AVCaptureSession            *session;//!< 会话
@property(nonatomic, strong)AVCaptureVideoPreviewLayer  *previewLayer;//!< 预览
@property(nonatomic, strong)JWDPreView                  *preView;//!< <#value#>

@end

@implementation JWDQRCodeViewController

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super init];
    if (self) {
        self.view.frame = frame;
        [self initUiConfig];
    }
    return self;
}

-(void)initUiConfig {

    // 默认为后置摄像头
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    self.deviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:device error:NULL];
    // 解析输入的数据
    self.metadataOutput = [[AVCaptureMetadataOutput alloc] init];
    [self.metadataOutput setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    // 会话
    self.session = [[AVCaptureSession alloc] init];
    if ([self.session canAddInput:self.deviceInput]){
        [self.session addInput:self.deviceInput];
    }
    if([self.session canAddOutput:self.metadataOutput]){
        [self.session addOutput:self.metadataOutput];
    }
    // 设置数据采集质量
    self.session.sessionPreset = AVCaptureSessionPresetHigh;
    // 设置需要解析的数据类型，二维码
    self.metadataOutput.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];
    JWDPreView *preView = [[JWDPreView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];
    self.preView = preView;
    [self.view addSubview:preView];
    preView.session = self.session;
    preView.backPreView = ^(JWDPreView *backPreView){
        [self.session stopRunning];
        [self dismissViewControllerAnimated:YES completion:nil];
        // 销毁定时器
        if (backPreView.timer){
            [backPreView.timer invalidate];
            backPreView.timer = nil;
        }
    };
    [self.session startRunning];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
}

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
    
    for (AVMetadataMachineReadableCodeObject *obj in metadataObjects) {
        SFSafariViewController *safariVC = [[SFSafariViewController alloc] initWithURL:[NSURL URLWithString:obj.stringValue]];
        [self presentViewController:safariVC animated:YES completion:nil];
    }
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

上面建立采集二维码的过滤器，和基本的输入和输出的建立，链接输入和输出的会话建立，以及开启和适当的时候关闭会话的处理。

切记这里要使用摄像头，所以要者info.plist 里面设置访问权限

Paste_Image.png

在解析获取捕捉到的信息后会在代理 AVCaptureMetadataOutputObjectsDelegate的下面方法里面获取信息

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
    
    for (AVMetadataMachineReadableCodeObject *obj in metadataObjects) {
        SFSafariViewController *safariVC = [[SFSafariViewController alloc] initWithURL:[NSURL URLWithString:obj.stringValue]];
        [self presentViewController:safariVC animated:YES completion:nil];
    }
}

获取到相应的数据后可以在这里面做一些业务逻辑，本人在这里就用到SFSafariViewController控制器来代开网页

好了下面介绍扫描界面
4.JWDPreView 扫一扫动画界面封装

JWDPreView.h

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>
@class JWDPreView;

typedef void(^backPreView) (JWDPreView *preView);

@interface JWDPreView : UIView

- (instancetype)initWithFrame:(CGRect)frame;

@property(nonatomic, strong)AVCaptureSession    *session;//!< 渲染会话层
@property (nonatomic, copy) backPreView         backPreView;//!< 返回按钮回调
@property(nonatomic, strong)NSTimer             *timer;//!< <#value#>

@end

JWDPreView.m

#import "JWDPreView.h"

@interface JWDPreView ()
{
    UIImageView   *_imageView;
    UIImageView   *_lineImageView;
    UIButton      *_backBtn;
}

@end

@implementation JWDPreView

// 修改当前View 的图层类别
+(Class)layerClass {

    return [AVCaptureVideoPreviewLayer class];
}

-(void)setSession:(AVCaptureSession *)session {

    _session = session;
    AVCaptureVideoPreviewLayer *layer = (AVCaptureVideoPreviewLayer *)self.layer;
    layer.session = session;
}

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        [self initUiConfig];
    }
    return self;
}
- (void)initUiConfig {
    
    _backBtn = [[UIButton alloc] initWithFrame:CGRectMake(30, 50, 40, 20)];
    [_backBtn setTitle:@"返回" forState:UIControlStateNormal];
    [_backBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [_backBtn addTarget:self action:@selector(backButtonDid) forControlEvents:UIControlEventTouchUpInside];
    [self addSubview:_backBtn];
    
    _imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"pick_bg.png"]];
    _imageView.frame = CGRectMake(self.bounds.size.width * 0.5 - 140, self.bounds.size.height * 0.5 - 140, 280, 280);
    [self addSubview:_imageView];
    
    _lineImageView = [[UIImageView alloc] initWithFrame:CGRectMake(30, 10, 220, 2)];
    _lineImageView.image = [UIImage imageNamed:@"line.png"];
    [_imageView addSubview:_lineImageView];
    
    _timer = [NSTimer scheduledTimerWithTimeInterval:3 target:self selector:@selector(animation) userInfo:nil repeats:YES];
}
- (void)animation
{
    [UIView animateWithDuration:2.8 delay:0 options:UIViewAnimationOptionCurveLinear animations:^{
        
        _lineImageView.frame = CGRectMake(30, 260, 220, 2);
        
    } completion:^(BOOL finished) {
        _lineImageView.frame = CGRectMake(30, 10, 220, 2);
    }];
}

- (void)backButtonDid {

    if (self.backPreView){
        self.backPreView(self);
    }
}

@end

在.m中一个重点就是扫一扫界面浏览layer的修改

Paste_Image.png

在UIView中默认的为 [CALayer class]而这不是二维码扫描所需的layer，所以修改。这样强转后的layer才有session的会话设置

// 修改当前View 的图层类别
+(Class)layerClass {

   return [AVCaptureVideoPreviewLayer class];
}

-(void)setSession:(AVCaptureSession *)session {

   _session = session;
   AVCaptureVideoPreviewLayer *layer = (AVCaptureVideoPreviewLayer *)self.layer;
   layer.session = session;
}

5.JWDCreatQRCodeView 生成二维码封装

JWDCreatQRCodeView.h

一句话生成二维码的接口

#import <UIKit/UIKit.h>

@interface JWDQRCodeViewController : UIViewController
- (instancetype)initWithFrame:(CGRect)frame;
@end

JWDCreatQRCodeView.m

#import "JWDQRCodeViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "JWDPreView.h"
#import <SafariServices/SafariServices.h>

@interface JWDQRCodeViewController ()<AVCaptureMetadataOutputObjectsDelegate>
@property(nonatomic, strong)AVCaptureDeviceInput        *deviceInput;//!< 摄像头输入
@property(nonatomic, strong)AVCaptureMetadataOutput     *metadataOutput;//!< 输出
@property(nonatomic, strong)AVCaptureSession            *session;//!< 会话
@property(nonatomic, strong)AVCaptureVideoPreviewLayer  *previewLayer;//!< 预览
@property(nonatomic, strong)JWDPreView                  *preView;//!< <#value#>

@end

@implementation JWDQRCodeViewController

- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super init];
    if (self) {
        self.view.frame = frame;
        [self initUiConfig];
    }
    return self;
}

-(void)initUiConfig {

    // 默认为后置摄像头
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    self.deviceInput = [[AVCaptureDeviceInput alloc] initWithDevice:device error:NULL];
    // 解析输入的数据
    self.metadataOutput = [[AVCaptureMetadataOutput alloc] init];
    [self.metadataOutput setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    // 会话
    self.session = [[AVCaptureSession alloc] init];
    if ([self.session canAddInput:self.deviceInput]){
        [self.session addInput:self.deviceInput];
    }
    if([self.session canAddOutput:self.metadataOutput]){
        [self.session addOutput:self.metadataOutput];
    }
    // 设置数据采集质量
    self.session.sessionPreset = AVCaptureSessionPresetHigh;
    // 设置需要解析的数据类型，二维码
    self.metadataOutput.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];
    JWDPreView *preView = [[JWDPreView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)];
    self.preView = preView;
    [self.view addSubview:preView];
    preView.session = self.session;
    preView.backPreView = ^(JWDPreView *backPreView){
        [self.session stopRunning];
        [self dismissViewControllerAnimated:YES completion:nil];
        // 销毁定时器
        if (backPreView.timer){
            [backPreView.timer invalidate];
            backPreView.timer = nil;
        }
    };
    [self.session startRunning];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
}

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
    
    for (AVMetadataMachineReadableCodeObject *obj in metadataObjects) {
        SFSafariViewController *safariVC = [[SFSafariViewController alloc] initWithURL:[NSURL URLWithString:obj.stringValue]];
        [self presentViewController:safariVC animated:YES completion:nil];
    }
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

Paste_Image.png

好了，这样介绍完了，上面的几个类就可以实现功能。

6.下面介绍
ViewController继承基本的全部功能

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "JWDPreView.h"
#import <SafariServices/SafariServices.h>
#import "JWDQRCodeViewController.h"
#import "JWDCreatQRCodeView.h"

@interface ViewController ()

@property(nonatomic, strong)UIButton              *code;//!< <#value#>
@property(nonatomic, strong)UIButton              *code1;//!< <#value#>
@property(nonatomic, strong)JWDCreatQRCodeView    *creatQRCodeView;//!< <#value#>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    CGFloat X = (self.view.frame.size.width - 2*100)/3.0;
    
    _code = [[UIButton alloc] initWithFrame:CGRectMake(X, 100, 100, 60)];
    _code.backgroundColor = [UIColor yellowColor];
    [_code setTitle:@"扫一扫" forState:UIControlStateNormal];
    [_code setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    [_code addTarget:self action:@selector(codeDidClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_code];
    
    
    _code1 = [[UIButton alloc] initWithFrame:CGRectMake(2*X + 100, 100, 100, 60)];
    _code1.backgroundColor = [UIColor yellowColor];
    [_code1 setTitle:@"生成二维码" forState:UIControlStateNormal];
    [_code1 setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
    [_code1 addTarget:self action:@selector(code1DidClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_code1];
    
}
- (void)codeDidClick {
    
    JWDQRCodeViewController *QRCodeVC = [[JWDQRCodeViewController alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
    [self presentViewController:QRCodeVC animated:YES completion:nil];

}

- (void)code1DidClick {

    UIView *qrCodeView = [[UIView alloc] initWithFrame:CGRectMake((self.view.frame.size.width-200)*0.5, 250, 200, 220)];
    [self.view addSubview:qrCodeView];
    
    JWDCreatQRCodeView *creatQRCodeView = [[JWDCreatQRCodeView alloc] initWithFrame:CGRectMake(0, 0, 200, 200) withQRCodeString:@"http://www.jianshu.com/users/5b9953c3d3ad/latest_articles" withQRCodeCenterImage:@"me"];
    self.creatQRCodeView = creatQRCodeView;
    
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 200, 200, 20)];
    label.text = @"长按识别二维码，跳转网页";
    label.font = [UIFont systemFontOfSize:12];
    label.textAlignment = NSTextAlignmentCenter;
    [qrCodeView addSubview:label];
    
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressDid)];
    creatQRCodeView.userInteractionEnabled = YES;
    [creatQRCodeView addGestureRecognizer:longPress];
    
    [qrCodeView addSubview:creatQRCodeView];
    
}

- (void)longPressDid{
    
    // 0.创建上下文
    CIContext *context = [[CIContext alloc] init];
    
    // 1.创建一个探测器
    CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:context options:@{CIDetectorAccuracy: CIDetectorAccuracyLow}];
    
    // 2.直接开始识别图片,获取图片特征
    CIImage *imageCI = [[CIImage alloc] initWithImage:self.creatQRCodeView.image];
    NSArray<CIFeature *> *features = [detector featuresInImage:imageCI];
    CIQRCodeFeature *codef = (CIQRCodeFeature *)features.firstObject;
    
    // 弹框
    UIAlertController *alertC = [UIAlertController alertControllerWithTitle:@"识别图中二维码" message:nil preferredStyle:UIAlertControllerStyleAlert];
    [alertC addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
        NSLog(@"取消");
    }]];
    __weak ViewController *weakSelf = self;
    [alertC addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        SFSafariViewController *safariVC = [[SFSafariViewController alloc] initWithURL:[NSURL URLWithString:codef.messageString]];
        [weakSelf presentViewController:safariVC animated:YES completion:nil];
    }]];
    [self presentViewController:alertC animated:YES completion:nil];
    
}

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

@end

完结，小小的一个demo，可能还有不完善的地方，当你发现了还请不吝赐教，谢谢。
最后奉上demo 地址 https://github.com/weidongjiang/JWD-QRCode

如果对你有用，解决了你的问题，得到了帮助，还请star。相互学习。

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业务需要屏蔽微信浏览器下拉查看网址且页面有图片二维码需要识别，长按不识别二维码长按识别二维码
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网友评论

午马丶:你好你知道微信的二维码保存是如何实现的吗，他保存的会把上面的头像和姓名都保存在本地，
Sanchain:请问，中间图片可以加载的是网络URL吗？我试过加载之后，生成的二维码扫描不了，楼主可以试一下吗
Sanchain:@诗说穿石刚刚测试验证了中间图片小一点，就可以扫描到二维码的信息了，谢谢
Sanchain:@诗说穿石好好，我试试
东方诗空:可以。扫描不了，你可以调整一下二维码图片的生成质量。或者把中间图片方的小一点，如果中间图片区域太大会遮挡二维码的信息，导致扫描不出来。你可以试试!
B_C_H:微信扫码的时候，摄像头离得远会放大画面
东方诗空:@SMFly 太忙，没事时间细想
SMFly:@诗说穿石这个放大的思路你们有吗，分享下
东方诗空:这个还没有试过，你可以搞搞
ChooseYourself:请问微信那种多种风格的二维码怎么生成的
东方诗空:@ChooseYourself 是滴
ChooseYourself:@诗说穿石然后根据背景的颜色，来绘制不同颜色的二维码？
东方诗空:加一个假的背景图
August24:大牛

iOS-仿微信扫一扫、长按识别二维码，以及一句话生成二维码

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