二维码扫码和相册二维码提取的方法在原生系统 AVFoundation 的 SDK 中提供了摄像头设备扫描捕获和检测提取的相应方法，具体方法 code 如下：
注：如下方法需在 iOS7 系统之后，通过系统中 AVMetadataObject 提供的方法，从而解析二维码
首先，通过相机摄像头扫描部分
#pragma mark - 扫描
- (void)beginScanning {
//获取摄像设备
AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
//创建输入流
AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
if (!input) return;
//创建输出流
AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc]init];
//设置代理 在主线程里刷新
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
//设置有效扫描区域
CGRect scanCrop=[self getScanCrop:_scanWindow.bounds readerViewBounds:self.view.frame];
output.rectOfInterest = scanCrop;
//初始化链接对象
_session = [[AVCaptureSession alloc]init];
//高质量采集率
[_session setSessionPreset:AVCaptureSessionPresetHigh];
[_session addInput:input];
[_session addOutput:output];
//设置扫码支持的编码格式(如下设置条形码和二维码兼容)
output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode,
AVMetadataObjectTypeEAN13Code,
AVMetadataObjectTypeEAN8Code,
AVMetadataObjectTypeCode128Code
];
AVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
layer.videoGravity=AVLayerVideoGravityResizeAspectFill;
layer.frame=self.view.layer.bounds;
[self.view.layer insertSublayer:layer atIndex:0];
//开始捕获
[_session startRunning];
}
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
if (metadataObjects.count > 0) {
[_session stopRunning];
AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjects objectAtIndex:0];
self.result = metadataObject.stringValue;
[self.Args setValue:self.result forKey:@"QrCode"]; // 将结果拼装并回调
if (self.delegate && [self.delegate respondsToSelector:@selector(QRCScanCallBack:)]) {
[self.delegate QRCScanCallBack:self.Args];
}
}
}
其次，通过相册选择二维码图片后检测并校验提取其中的数据
#pragma mark - Delegate
- (void)YHCameraCallBack:(UIImage *)image {
NSLog(@"相册回调：%@", image);
// 初始化检测器
CIDetector*detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{ CIDetectorAccuracy : CIDetectorAccuracyHigh }];
// 监测到的结果数组
NSArray *features = [detector featuresInImage:[CIImage imageWithCGImage:image.CGImage]];
if (features.count >=1) {
/** 结果对象 */
CIQRCodeFeature *feature = [features objectAtIndex:0];
NSString *scannedRes = feature.messageString;
[self disMiss];
NSLog(@"二维码扫码结果：%@", scannedRes);
[self.Args setValue:scannedRes forKey:@"QrCode"]; // 将结果拼装并回调
if (self.delegate && [self.delegate respondsToSelector:@selector(QRCScanCallBack:)]) {
[self.delegate QRCScanCallBack:self.Args];
}
} else {
UIAlertView * alertView = [[UIAlertView alloc]initWithTitle:@"提示" message:@"该图片没有包含一个二维码" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
[alertView show];
}
}
通过如上两个 code 片段即可实现对二维码的识别和提取操作，具体还有一些详细的属性和方法可以从其提供的 SDK 接口中挑选配置；
最后，如下是一个完整的 demo 可供参考：
#import "FYHBaseViewController.h"
typedef void(^returnQRCScanRsultBlock)(NSString *result);
@protocol QRCScanViewControllerDelegate <NSObject>
- (void)QRCScanCallBack:(NSMutableDictionary *)Dic;
@end
@interface QRCScanViewController : FYHBaseViewController
@property (nonatomic, strong) NSMutableDictionary *Args;
@property (nonatomic, assign) id<QRCScanViewControllerDelegate>delegate;
@property (nonatomic, copy) returnQRCScanRsultBlock QRCScanRsultBlock;
- (void)setQRCScanRsultBlock:(returnQRCScanRsultBlock)QRCScanRsultBlock;
- (returnQRCScanRsultBlock)QRCScanRsultBlock;
@end
#import "QRCScanViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "UIView+Exttension.h"
#import "UIImage+FYH.h"
#import "YHCameraManager.h"
@interface QRCScanViewController () <AVCaptureMetadataOutputObjectsDelegate, UIAlertViewDelegate, YHCameraManagerDelegate>
@property (nonatomic, strong) AVCaptureSession *session;
@property (nonatomic, strong) UIImageView *scanLineImageView;
@property (nonatomic, strong) UIView *scanWindow;
@property (nonatomic, strong) UIView *maskView;
@property (nonatomic, copy) NSString *result;
@end
@implementation QRCScanViewController
- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
// self.navigationController.navigationBar.hidden = YES;
// [self leftNavButtonType:NavLeftButtonTypeBack];
[self basicConfig];
[self resumeAnimation];
}
- (void)viewDidLoad {
[super viewDidLoad];
[self setupMaskView];
[self setupScanWindow];
[self beginScanning];
[kNotificationCenter addObserver:self
selector:@selector(resumeAnimation)
name:@"EnterForeground"
object:nil];
}
- (void)viewDidDisappear:(BOOL)animated{
[super viewDidDisappear:animated];
// self.navigationController.navigationBar.hidden = NO;
// [self.navigationController setNavigationBarHidden:YES animated:YES];
}
- (void)basicConfig {
// self.tabBarController.hidesBottomBarWhenPushed = YES;
// [self setupNavView]; // 自定义导航
[self.navigationController setNavigationBarHidden:NO animated:YES];
self.navigationController.navigationBar.translucent = NO;
[self.navigationController.navigationBar setBackgroundImage:[UIImage imageWithColor:[UIColor colorWithRed:0 green:0 blue:0 alpha:0.7]]
forBarMetrics:UIBarMetricsDefault];
[self leftNavButtonType:NavButtonStyleBackWhite];
[self settingNavRightButton];
}
- (void)settingNavRightButton {
UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
btn.titleLabel.font = [UIFont systemFontOfSize:14.f];
[btn setTitle:@"相册" forState:UIControlStateNormal];
[btn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[btn addTarget:self action:@selector(btnClickSelPhoto:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *item = [[UIBarButtonItem alloc] initWithCustomView:btn];
self.navigationItem.rightBarButtonItem = item;
}
- (void)btnClickSelPhoto:(UIButton *)btn {
NSLog(@"调用系统相册");
YHCameraManager *cameraMag = [YHCameraManager shareInstance];
cameraMag.delegate = self;
[cameraMag openPhotoLibraryWithController:self];
}
- (void)dealloc {
[kNotificationCenter removeObserver:self name:@"EnterForeground" object:nil];
}
#pragma mark - 自定义导航视图 Btn（注：若不需要相册二维码识别，也可使用该方法）
-(void)setupNavView {
UIView *bgView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.width, 64)];
bgView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7];
bgView.userInteractionEnabled = YES;
//1.返回
UIButton *backBtn=[UIButton buttonWithType:UIButtonTypeCustom];
backBtn.frame = CGRectMake(20, 30, 25, 25);
[backBtn setBackgroundImage:[[UIImage imageNamed:@"navBack"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]
forState:UIControlStateNormal];
// backBtn.contentMode = UIViewContentModeScaleAspectFit;
[backBtn addTarget:self action:@selector(disMiss) forControlEvents:UIControlEventTouchUpInside];
[bgView addSubview:backBtn];
[self.view addSubview:bgView];
}
#pragma mark - UI
- (void)setupMaskView {
CGFloat Margin = 30; //
CGFloat scanWindowH = self.view.width - 30 * 2;
// CGFloat scanWindowW = self.view.height - 30 * 2;
// UIView *topBackgroundView = [[UIView alloc]initWithFrame:CGRectMake(0, 64, self.view.width, 100)]; // 无系统导航版本
UIView *topBackgroundView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, self.view.width, 100)];
topBackgroundView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7];
[self.view addSubview:topBackgroundView];
UIView *leftBackgroundView = [[UIView alloc]initWithFrame:CGRectMake(0, CGRectGetMaxY(topBackgroundView.frame), Margin, scanWindowH)];
leftBackgroundView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7];
[self.view addSubview:leftBackgroundView];
UIView *rightBackgroundView = [[UIView alloc]initWithFrame:CGRectMake(self.view.width - Margin, leftBackgroundView.y, leftBackgroundView.width, leftBackgroundView.height)];
rightBackgroundView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7];
[self.view addSubview:rightBackgroundView];
UIView *bottmBackgroundView = [[UIView alloc]initWithFrame:CGRectMake(0, CGRectGetMaxY(rightBackgroundView.frame), self.view.width, self.view.height - CGRectGetMaxY(rightBackgroundView.frame))];
bottmBackgroundView.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7];
[self.view addSubview:bottmBackgroundView];
}
#pragma mark - 设置相机 UI
- (void)setupScanWindow {
CGFloat kMargin = 30;
CGFloat scanWindowH = self.view.width - kMargin * 2;
CGFloat scanWindowW = self.view.width - kMargin * 2;
_scanWindow = [[UIView alloc] initWithFrame:CGRectMake(kMargin, 100, scanWindowW, scanWindowH)];
_scanWindow.clipsToBounds = YES;
[self.view addSubview:_scanWindow];
self.scanLineImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"scan_net"]];
CGFloat buttonWH = 18;
UIButton *topLeft = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, buttonWH, buttonWH)];
[topLeft setImage:[UIImage imageNamed:@"scan_1"] forState:UIControlStateNormal];
[_scanWindow addSubview:topLeft];
UIButton *topRight = [[UIButton alloc] initWithFrame:CGRectMake(scanWindowW - buttonWH, 0, buttonWH, buttonWH)];
[topRight setImage:[UIImage imageNamed:@"scan_2"] forState:UIControlStateNormal];
[_scanWindow addSubview:topRight];
UIButton *bottomLeft = [[UIButton alloc] initWithFrame:CGRectMake(0, scanWindowH - buttonWH, buttonWH, buttonWH)];
[bottomLeft setImage:[UIImage imageNamed:@"scan_3"] forState:UIControlStateNormal];
[_scanWindow addSubview:bottomLeft];
UIButton *bottomRight = [[UIButton alloc] initWithFrame:CGRectMake(topRight.x, bottomLeft.y, buttonWH, buttonWH)];
[bottomRight setImage:[UIImage imageNamed:@"scan_4"] forState:UIControlStateNormal];
[_scanWindow addSubview:bottomRight];
UILabel * tipLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, CGRectGetMaxY(_scanWindow.frame) + 20, self.view.bounds.size.width, 12)];
tipLabel.text = @"将取景框对准二维码，即可自动扫描";
tipLabel.textColor = [UIColor whiteColor];
tipLabel.textAlignment = NSTextAlignmentCenter;
tipLabel.lineBreakMode = NSLineBreakByWordWrapping;
tipLabel.numberOfLines = 2;
tipLabel.font=[UIFont systemFontOfSize:12];
tipLabel.backgroundColor = [UIColor clearColor];
[self.view addSubview:tipLabel];
}
- (void)resumeAnimation {
CAAnimation *anim = [self.scanLineImageView.layer animationForKey:@"translationAnimation"];
if(anim){
// 1. 将动画的时间偏移量作为暂停时的时间点
CFTimeInterval pauseTime = self.scanLineImageView.layer.timeOffset;
// 2. 根据媒体时间计算出准确的启动动画时间，对之前暂停动画的时间进行修正
CFTimeInterval beginTime = CACurrentMediaTime() - pauseTime;
// 3. 要把偏移时间清零
[self.scanLineImageView.layer setTimeOffset:0.0];
// 4. 设置图层的开始动画时间
[self.scanLineImageView.layer setBeginTime:beginTime];
[self.scanLineImageView.layer setSpeed:1.0];
} else {
CGFloat scanNetImageViewH = 241;
CGFloat scanWindowH = self.view.width - 30 * 2;
CGFloat scanNetImageViewW = _scanWindow.width;
self.scanLineImageView.frame = CGRectMake(0, -scanNetImageViewH, scanNetImageViewW, scanNetImageViewH);
CABasicAnimation *scanNetAnimation = [CABasicAnimation animation];
scanNetAnimation.keyPath = @"transform.translation.y";
scanNetAnimation.byValue = @(scanWindowH);
scanNetAnimation.duration = 1.5;
scanNetAnimation.repeatCount = MAXFLOAT;
[self.scanLineImageView.layer addAnimation:scanNetAnimation forKey:@"translationAnimation"];
[_scanWindow addSubview:self.scanLineImageView];
}
}
#pragma mark - 扫描
- (void)beginScanning {
//获取摄像设备
AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
//创建输入流
AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
if (!input) return;
//创建输出流
AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc]init];
//设置代理 在主线程里刷新
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
//设置有效扫描区域
CGRect scanCrop=[self getScanCrop:_scanWindow.bounds readerViewBounds:self.view.frame];
output.rectOfInterest = scanCrop;
//初始化链接对象
_session = [[AVCaptureSession alloc]init];
//高质量采集率
[_session setSessionPreset:AVCaptureSessionPresetHigh];
[_session addInput:input];
[_session addOutput:output];
//设置扫码支持的编码格式(如下设置条形码和二维码兼容)
output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode,
AVMetadataObjectTypeEAN13Code,
AVMetadataObjectTypeEAN8Code,
AVMetadataObjectTypeCode128Code
];
AVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
layer.videoGravity=AVLayerVideoGravityResizeAspectFill;
layer.frame=self.view.layer.bounds;
[self.view.layer insertSublayer:layer atIndex:0];
//开始捕获
[_session startRunning];
}
#pragma mark - 获取扫描区域的比例关系
- (CGRect)getScanCrop:(CGRect)rect readerViewBounds:(CGRect)readerViewBounds {
CGFloat x,y,width,height;
x = (CGRectGetHeight(readerViewBounds)-CGRectGetHeight(rect))/2/CGRectGetHeight(readerViewBounds);
y = (CGRectGetWidth(readerViewBounds)-CGRectGetWidth(rect))/2/CGRectGetWidth(readerViewBounds);
width = CGRectGetHeight(rect)/CGRectGetHeight(readerViewBounds);
height = CGRectGetWidth(rect)/CGRectGetWidth(readerViewBounds);
return CGRectMake(x, y, width, height);
}
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {
if (metadataObjects.count > 0) {
[_session stopRunning];
AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjects objectAtIndex:0];
self.result = metadataObject.stringValue;
[self disMiss];
[self.Args setValue:self.result forKey:@"QrCode"];
if (self.delegate && [self.delegate respondsToSelector:@selector(QRCScanCallBack:)]) {
[self.delegate QRCScanCallBack:self.Args];
}
}
}
//- (void)setArgs:(NSMutableDictionary *)Args
//{
// if (self.Args != Args)
// {
// self.Args = Args;
// }
//
//}
- (void)setQRCScanRsultBlock:(returnQRCScanRsultBlock)QRCScanRsultBlock {
if (self.QRCScanRsultBlock != QRCScanRsultBlock) {
self.QRCScanRsultBlock = QRCScanRsultBlock;
}
}
- (returnQRCScanRsultBlock)QRCScanRsultBlock {
return self.QRCScanRsultBlock;
}
- (void)disMiss {
[self.navigationController popViewControllerAnimated:YES];
}
#pragma mark - 提示框
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex == 0) {
[_session startRunning];
} else if (buttonIndex == 1) {
[self disMiss];
[self.Args setValue:self.result forKey:@"QrCode"];
if (self.delegate && [self.delegate respondsToSelector:@selector(QRCScanCallBack:)]) {
[self.delegate QRCScanCallBack:self.Args];
}
}
}
#pragma mark - Delegate
- (void)YHCameraCallBack:(UIImage *)image {
NSLog(@"相册回调：%@", image);
// 初始化检测器
CIDetector*detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{ CIDetectorAccuracy : CIDetectorAccuracyHigh }];
// 监测到的结果数组
NSArray *features = [detector featuresInImage:[CIImage imageWithCGImage:image.CGImage]];
if (features.count >=1) {
/** 结果对象 */
CIQRCodeFeature *feature = [features objectAtIndex:0];
NSString *scannedRes = feature.messageString;
[self disMiss];
NSLog(@"二维码扫码结果：%@", scannedRes);
[self.Args setValue:scannedRes forKey:@"QrCode"];
if (self.delegate && [self.delegate respondsToSelector:@selector(QRCScanCallBack:)]) {
[self.delegate QRCScanCallBack:self.Args];
}
} else {
UIAlertView * alertView = [[UIAlertView alloc]initWithTitle:@"提示" message:@"该图片没有包含一个二维码" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
[alertView show];
}
}
@end
拓展：
1.实现中背景色部分应用到了 Color 转 Image 的方法具体如下：
+ (UIImage *)imageWithColor:(UIColor *)color {
CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
2.调用相册的功能封装成了单独的 基于 UIImagePickerController 的拓展封装 - iOS 类，具体方法实现如下：
/**
调用相册
@param controller 当前 VC 控件
*/
- (void)openPhotoLibraryWithController:(UIViewController *)controller {
if (@available(iOS 11, *)) {
UIScrollView.appearance.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentAutomatic;
}
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.allowsEditing = YES;
imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
imagePicker.delegate = self;
[controller presentViewController:imagePicker animated:YES completion:^{
NSLog(@"调用了 --- 相册");
}];
} else {
[MBProgressHUD showCommonHudWithAlertString:@"无法打开相册" afterDelay:2.0 toView:controller.view];
}
}
以上便是此次分享的全部内容，希望能对大家有所帮助！
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