iOS 原生二维码的扫描详解(代码)

#import <AVFoundation/AVFoundation.h> // 要引入
static const CGFloat kBorderW = 100;
static const CGFloat kMargin = 30;
@interface Scan_VC ()<UIAlertViewDelegate,AVCaptureMetadataOutputObjectsDelegate,UINavigationControllerDelegate, UIImagePickerControllerDelegate>{

}
@property (nonatomic, strong) AVCaptureSession *session;
@property (nonatomic, weak)   UIView *maskView;
@property (nonatomic, strong) UIView *scanWindow;
@property (nonatomic, strong) UIImageView *scanNetImageView;
@end

@implementation Scan_VC
-(void)viewWillAppear:(BOOL)animated{

self.navigationController.navigationBar.hidden=YES;
[self resumeAnimation];

}
-(void)viewDidDisappear:(BOOL)animated{

self.navigationController.navigationBar.hidden=NO;

}
- (void)viewDidLoad {
[super viewDidLoad];
//这个属性必须打开否则返回的时候会出现黑边
self.view.clipsToBounds=YES;
//1.遮罩
[self setupMaskView];
//2.下边栏
[self setupBottomBar];
//3.提示文本
[self setupTipTitleView];
//4.顶部导航
[self setupNavView];
//5.扫描区域
[self setupScanWindowView];
//6.开始动画
[self beginScanning];

[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(resumeAnimation) name:@"EnterForeground" object:nil];

}
-(void)setupTipTitleView{

//1.补充遮罩

UIView*mask=[[UIView alloc]initWithFrame:CGRectMake(0, _maskView.sd_y+_maskView.sd_height, self.view.sd_width, kBorderW)];
mask.backgroundColor=[UIColor colorWithRed:0 green:0 blue:0 alpha:0.7];
[self.view addSubview:mask];

//2.操作提示
UILabel * tipLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, self.view.sd_height*0.9-kBorderW*2, self.view.bounds.size.width, kBorderW)];
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)setupNavView{

//1.返回

UIButton *backBtn=[UIButton buttonWithType:UIButtonTypeCustom];
backBtn.frame = CGRectMake(20, 30, 25, 25);
[backBtn setBackgroundImage:[UIImage imageNamed:@"qrcode_scan_titlebar_back_nor"] forState:UIControlStateNormal];
backBtn.contentMode=UIViewContentModeScaleAspectFit;
[backBtn addTarget:self action:@selector(disMiss) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:backBtn];

//2.相册

UIButton * albumBtn=[UIButton buttonWithType:UIButtonTypeCustom];
albumBtn.frame = CGRectMake(0, 0, 35, 49);
albumBtn.center=CGPointMake(self.view.sd_width/2, 20+49/2.0);
[albumBtn setBackgroundImage:[UIImage imageNamed:@"qrcode_scan_btn_photo_down"] forState:UIControlStateNormal];
albumBtn.contentMode=UIViewContentModeScaleAspectFit;
[albumBtn addTarget:self action:@selector(myAlbum) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:albumBtn];

//3.闪光灯

UIButton * flashBtn=[UIButton buttonWithType:UIButtonTypeCustom];
flashBtn.frame = CGRectMake(self.view.sd_width-55,20, 35, 49);
[flashBtn setBackgroundImage:[UIImage imageNamed:@"qrcode_scan_btn_flash_down"] forState:UIControlStateNormal];
flashBtn.contentMode=UIViewContentModeScaleAspectFit;
[flashBtn addTarget:self action:@selector(openFlash:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:flashBtn];

}
- (void)setupMaskView
{
UIView *mask = [[UIView alloc] init];
_maskView = mask;

mask.layer.borderColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.7].CGColor;
mask.layer.borderWidth = kBorderW;

mask.bounds = CGRectMake(0, 0, self.view.sd_width + kBorderW + kMargin , self.view.sd_width + kBorderW + kMargin);
mask.center = CGPointMake(self.view.sd_width * 0.5, self.view.sd_height * 0.5);
mask.sd_y = 0;

[self.view addSubview:mask];
}

- (void)setupBottomBar

{
//1.下边栏
UIView *bottomBar = [[UIView alloc] initWithFrame:CGRectMake(0, self.view.sd_height * 0.9, self.view.sd_width, self.view.sd_height * 0.1)];
bottomBar.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.8];

[self.view addSubview:bottomBar];

//2.我的二维码
UIButton * myCodeBtn=[UIButton buttonWithType:UIButtonTypeCustom];
myCodeBtn.frame = CGRectMake(0,0, self.view.sd_height * 0.1*35/49, self.view.sd_height * 0.1);
myCodeBtn.center=CGPointMake(self.view.sd_width/2, self.view.sd_height * 0.1/2);
[myCodeBtn setImage:[UIImage imageNamed:@"qrcode_scan_btn_myqrcode_down"] forState:UIControlStateNormal];

myCodeBtn.contentMode=UIViewContentModeScaleAspectFit;

[myCodeBtn addTarget:self action:@selector(myCode) forControlEvents:UIControlEventTouchUpInside];
[bottomBar addSubview:myCodeBtn];

}
- (void)setupScanWindowView
{
CGFloat scanWindowH = self.view.sd_width - kMargin * 2;
CGFloat scanWindowW = self.view.sd_width - kMargin * 2;
_scanWindow = [[UIView alloc] initWithFrame:CGRectMake(kMargin, kBorderW, scanWindowW, scanWindowH)];
_scanWindow.clipsToBounds = YES;
[self.view addSubview:_scanWindow];

_scanNetImageView = [[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.sd_x, bottomLeft.sd_y, buttonWH, buttonWH)];
[bottomRight setImage:[UIImage imageNamed:@"scan_4"] forState:UIControlStateNormal];
[_scanWindow addSubview:bottomRight];
}

- (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 ];

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"扫描结果" message:metadataObject.stringValue delegate:self cancelButtonTitle:@"退出" otherButtonTitles:@"再次扫描", nil];
[alert show];
}
}
#pragma mark-> 我的相册
-(void)myAlbum{

NSLog(@"我的相册");
if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]){
//1.初始化相册拾取器
UIImagePickerController *controller = [[UIImagePickerController alloc] init];
//2.设置代理
controller.delegate = self;
//3.设置资源：
/**
UIImagePickerControllerSourceTypePhotoLibrary,相册
UIImagePickerControllerSourceTypeCamera,相机
UIImagePickerControllerSourceTypeSavedPhotosAlbum,照片库
*/
controller.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
//4.随便给他一个转场动画
controller.modalTransitionStyle=UIModalTransitionStyleFlipHorizontal;
[self presentViewController:controller animated:YES completion:NULL];

}else{

UIAlertView * alert = [[UIAlertView alloc]initWithTitle:@"提示" message:@"设备不支持访问相册，请在设置->隐私->照片中进行设置！" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
[alert show];
}

}
#pragma mark-> imagePickerController delegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
//1.获取选择的图片
UIImage *image = info[UIImagePickerControllerOriginalImage];
//2.初始化一个监测器
CIDetector*detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{ CIDetectorAccuracy : CIDetectorAccuracyHigh }];

[picker dismissViewControllerAnimated:YES completion:^{
//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 *scannedResult = feature.messageString;
UIAlertView * alertView = [[UIAlertView alloc]initWithTitle:@"扫描结果" message:scannedResult delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
[alertView show];

}
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];

}

}];

}
#pragma mark-> 闪光灯
-(void)openFlash:(UIButton*)button{

NSLog(@"闪光灯");
button.selected = !button.selected;
if (button.selected) {
[self turnTorchOn:YES];
}
else{
[self turnTorchOn:NO];
}

}
#pragma mark-> 我的二维码
-(void)myCode{

NSLog(@"我的二维码");
ViewController2*vc=[[ViewController2 alloc]init];
[self.navigationController pushViewController:vc animated:YES];

}
#pragma mark-> 开关闪光灯
- (void)turnTorchOn:(BOOL)on
{

Class captureDeviceClass = NSClassFromString(@"AVCaptureDevice");
if (captureDeviceClass != nil) {
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

if ([device hasTorch] && [device hasFlash]){

[device lockForConfiguration:nil];
if (on) {
[device setTorchMode:AVCaptureTorchModeOn];
[device setFlashMode:AVCaptureFlashModeOn];

} else {
[device setTorchMode:AVCaptureTorchModeOff];
[device setFlashMode:AVCaptureFlashModeOff];
}
[device unlockForConfiguration];
}
}
}

#pragma mark 恢复动画
- (void)resumeAnimation
{
CAAnimation *anim = [_scanNetImageView.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 = _scanNetImageView.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
[_scanNetImageView.layer setTimeOffset:0.0];
// 4. 设置图层的开始动画时间
[_scanNetImageView.layer setBeginTime:beginTime];

[_scanNetImageView.layer setSpeed:1.0];

}else{

CGFloat scanNetImageViewH = 241;
CGFloat scanWindowH = self.view.sd_width - kMargin * 2;
CGFloat scanNetImageViewW = _scanWindow.sd_width;

_scanNetImageView.frame = CGRectMake(0, -scanNetImageViewH, scanNetImageViewW, scanNetImageViewH);
CABasicAnimation *scanNetAnimation = [CABasicAnimation animation];
scanNetAnimation.keyPath = @"transform.translation.y";
scanNetAnimation.byValue = @(scanWindowH);
scanNetAnimation.duration = 1.0;
scanNetAnimation.repeatCount = MAXFLOAT;
[_scanNetImageView.layer addAnimation:scanNetAnimation forKey:@"translationAnimation"];
[_scanWindow addSubview:_scanNetImageView];
}

}
#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);

}