iOS 掃一掃功能實(shí)現(xiàn)

1、iOS 掃一掃功能實(shí)現(xiàn)下面貼上代碼：AppDelegate.m：objc view plain copy 在CODE上查看代碼片派生到我的代碼片- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions self.window = UIWindow alloc initWithFrame:UIScreen mainScreen bounds; self.window.rootViewController = UINavigationCon

2、troller alloc initWithRootViewController:ViewController alloc init; self.window.backgroundColor = UIColor whiteColor; self.window makeKeyAndVisible; return YES; ViewController：objc view plain copy 在CODE上查看代碼片派生到我的代碼片#import <UIKit/UIKit.h> interface ViewController : UIViewController end /* -分割

3、線- */ #import "ViewController.h" #import "HWScanViewController.h" implementation ViewController - (void)viewDidLoad super viewDidLoad; self.view.backgroundColor = UIColor whiteColor; /創(chuàng)建控件 self creatControl; - (void)creatControl /掃一掃按鈕 UIButton *scanBtn = UIButton alloc initWithF

4、rame:CGRectMake(100, 100, 100, 44); scanBtn.backgroundColor = UIColor orangeColor; scanBtn setTitle:"掃一掃" forState:UIControlStateNormal; scanBtn addTarget:self action:selector(scanBtnOnClick) forControlEvents:UIControlEventTouchUpInside; self.view addSubview:scanBtn; - (void)scanBtnOnClick

5、 HWScanViewController *vc = HWScanViewController alloc init; self.navigationController pushViewController:vc animated:YES; end HWScanViewController：objc view plain copy 在CODE上查看代碼片派生到我的代碼片#import <UIKit/UIKit.h> interface HWScanViewController : UIViewController end /* -分割線- */ #import "HW

6、ScanViewController.h" #import <AVFoundation/AVFoundation.h> #define KMainW UIScreen mainScreen.bounds.size.width #define KMainH UIScreen mainScreen.bounds.size.height interface HWScanViewController ()<AVCaptureMetadataOutputObjectsDelegate, UINavigationControllerDelegate, UIImagePicker

7、ControllerDelegate> property (nonatomic, strong) NSTimer *timer; property (nonatomic, strong) AVCaptureDevice *device; property (nonatomic, strong) AVCaptureSession *session; property (nonatomic, strong) AVCaptureVideoPreviewLayer *preview; property (nonatomic, weak) UIImageView *line; property (

8、nonatomic, assign) NSInteger distance; end implementation HWScanViewController - (void)viewDidLoad super viewDidLoad; /初始化信息 self initInfo; /創(chuàng)建控件 self creatControl; /設(shè)置參數(shù) self setupCamera; /添加定時(shí)器 self addTimer; - (void)viewWillDisappear:(BOOL)animated super viewWillDisappear:animated; self stopScann

9、ing; - (void)initInfo /背景色 self.view.backgroundColor = UIColor blackColor; /導(dǎo)航標(biāo)題 self.navigationItem.title = "二維碼/條形碼" /導(dǎo)航右側(cè)相冊(cè)按鈕 self.navigationItem.rightBarButtonItem = UIBarButtonItem alloc initWithTitle:"相冊(cè)" style:UIBarButtonItemStylePlain target:self action:selector(photoBtnO

10、nClick); - (void)creatControl CGFloat scanW = KMainW * 0.65; CGFloat padding = 10.0f; CGFloat labelH = 20.0f; CGFloat tabBarH = 64.0f; CGFloat cornerW = 26.0f; CGFloat marginX = (KMainW - scanW) * 0.5; CGFloat marginY = (KMainH - scanW - padding - labelH) * 0.5; /遮蓋視圖 for (int i = 0; i < 4; i+) U

11、IView *cover = UIView alloc initWithFrame:CGRectMake(0, (marginY + scanW) * i, KMainW, marginY + (padding + labelH) * i); if (i = 2 | i = 3) cover.frame = CGRectMake(marginX + scanW) * (i - 2), marginY, marginX, scanW); cover.backgroundColor = UIColor blackColor colorWithAlphaComponent:0.5f; self.vi

12、ew addSubview:cover; /掃描視圖 UIView *scanView = UIView alloc initWithFrame:CGRectMake(marginX, marginY, scanW, scanW); self.view addSubview:scanView; /掃描線 UIImageView *line = UIImageView alloc initWithFrame:CGRectMake(0, 0, scanW, 2); self drawLineForImageView:line; scanView addSubview:line; self.line

13、 = line; /邊框 UIView *borderView = UIView alloc initWithFrame:CGRectMake(0, 0, scanW, scanW); borderView.layer.borderColor = UIColor whiteColor CGColor; borderView.layer.borderWidth = 1.0f; scanView addSubview:borderView; /掃描視圖四個(gè)角 for (int i = 0; i < 4; i+) CGFloat imgViewX = (scanW - cornerW) * (

14、i % 2); CGFloat imgViewY = (scanW - cornerW) * (i / 2); UIImageView *imgView = UIImageView alloc initWithFrame:CGRectMake(imgViewX, imgViewY, cornerW, cornerW); if (i = 0 | i = 1) imgView.transform = CGAffineTransformRotate(imgView.transform, M_PI_2 * i); else imgView.transform = CGAffineTransformRo

15、tate(imgView.transform, - M_PI_2 * (i - 1); self drawImageForImageView:imgView; scanView addSubview:imgView; /提示標(biāo)簽 UILabel *label = UILabel alloc initWithFrame:CGRectMake(0, CGRectGetMaxY(scanView.frame) + padding, KMainW, labelH); label.text = "將二維碼/條形碼放入框內(nèi)，即可自動(dòng)掃描" label.font = UIFont sys

16、temFontOfSize:16.0f; label.textAlignment = NSTextAlignmentCenter; label.textColor = UIColor whiteColor; self.view addSubview:label; /選項(xiàng)欄 UIView *tabBarView = UIView alloc initWithFrame:CGRectMake(0, KMainH - tabBarH, KMainW, tabBarH); tabBarView.backgroundColor = UIColor blackColor colorWithAlphaCom

17、ponent:0.8f; self.view addSubview:tabBarView; /開啟照明按鈕 UIButton *lightBtn = UIButton alloc initWithFrame:CGRectMake(KMainW - 100, 0, 100, tabBarH); lightBtn.titleLabel.font = UIFont systemFontOfSize:16.0f; lightBtn setTitle:"開啟照明" forState:UIControlStateNormal; lightBtn setTitle:"關(guān)閉照明&

18、quot; forState:UIControlStateSelected; lightBtn addTarget:self action:selector(lightBtnOnClick:) forControlEvents:UIControlEventTouchUpInside; tabBarView addSubview:lightBtn; - (void)setupCamera dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), /初始化相機(jī)設(shè)備 _device = AVCaptur

19、eDevice defaultDeviceWithMediaType:AVMediaTypeVideo; /初始化輸入流 AVCaptureDeviceInput *input = AVCaptureDeviceInput deviceInputWithDevice:_device error:nil; /初始化輸出流 AVCaptureMetadataOutput *output = AVCaptureMetadataOutput alloc init; /設(shè)置代理，主線程刷新 output setMetadataObjectsDelegate:self queue:dispatch_get

20、_main_queue(); /初始化鏈接對(duì)象 _session = AVCaptureSession alloc init; /高質(zhì)量采集率 _session setSessionPreset:AVCaptureSessionPresetHigh; if (_session canAddInput:input) _session addInput:input; if (_session canAddOutput:output) _session addOutput:output; /條碼類型（二維碼/條形碼） output.metadataObjectTypes = NSArray arra

21、yWithObjects:AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code, AVMetadataObjectTypeQRCode, nil nil; /更新界面 dispatch_async(dispatch_get_main_queue(), _preview = AVCaptureVideoPreviewLayer layerWithSession:_session; _preview.videoGravity = AVLayerVideoGravity

22、ResizeAspectFill; _preview.frame = CGRectMake(0, 0, KMainW, KMainH); self.view.layer insertSublayer:_preview atIndex:0; _session startRunning; ); ); - (void)addTimer _distance = 0; self.timer = NSTimer scheduledTimerWithTimeInterval:0.01f target:self selector:selector(timerAction) userInfo:nil repea

23、ts:YES; NSRunLoop mainRunLoop addTimer:self.timer forMode:NSRunLoopCommonModes; - (void)timerAction if (_distance+ > KMainW * 0.65) _distance = 0; _line.frame = CGRectMake(0, _distance, KMainW * 0.65, 2); - (void)removeTimer _timer invalidate; _timer = nil; /照明按鈕點(diǎn)擊事件 - (void)lightBtnOnClick:(UIBu

24、tton *)btn /判斷是否有閃光燈 if (!_device hasTorch) self showAlertWithTitle:"當(dāng)前設(shè)備沒(méi)有閃光燈，無(wú)法開啟照明功能" message:nil sureHandler:nil cancelHandler:nil; return; btn.selected = !btn.selected; _device lockForConfiguration:nil; if (btn.selected) _device setTorchMode:AVCaptureTorchModeOn; else _device setTorch

25、Mode:AVCaptureTorchModeOff; _device unlockForConfiguration; /進(jìn)入相冊(cè) - (void)photoBtnOnClick if (UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary) UIImagePickerController *controller = UIImagePickerController alloc init; controller.sourceType = UIImagePickerCo

26、ntrollerSourceTypePhotoLibrary; controller.delegate = lf; self presentViewController:controller animated:YES completion:nil; else self showAlertWithTitle:"當(dāng)前設(shè)備不支持訪問(wèn)相冊(cè)" message:nil sureHandler:nil cancelHandler:nil; #pragma mark - AVCaptureMetadataOutputObjectsDelegate - (void)captureOutput

27、:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection /掃描完成 if (metadataObjects count > 0) /停止掃描 self stopScanning; /顯示結(jié)果 self showAlertWithTitle:"掃描結(jié)果" message:metadataObjects firstObject stringValue sureH

28、andler:nil cancelHandler:nil; - (void)stopScanning _session stopRunning; _session = nil; _preview removeFromSuperlayer; self removeTimer; #pragma mark - UIImagePickerControllrDelegate - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSStr

29、ing *,id> *)info picker dismissViewControllerAnimated:YES completion: /獲取相冊(cè)圖片 UIImage *image = infoUIImagePickerControllerOriginalImage; /識(shí)別圖片 CIDetector *detector = CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:CIDetectorAccuracy:CIDetectorAccuracyHigh; NSArray *features = d

30、etector featuresInImage:CIImage imageWithCGImage:image.CGImage; /識(shí)別結(jié)果 if (features.count > 0) self showAlertWithTitle:"掃描結(jié)果" message:features firstObject messageString sureHandler:nil cancelHandler:nil; else self showAlertWithTitle:"沒(méi)有識(shí)別到二維碼或條形碼" message:nil sureHandler:nil ca

31、ncelHandler:nil; ; /提示彈窗 - (void)showAlertWithTitle:(NSString *)title message:(NSString *)message sureHandler:(void ()()sureHandler cancelHandler:(void ()()cancelHandler UIAlertController *alertController = UIAlertController alertControllerWithTitle:title message:message preferredStyle:UIAlertContro

32、llerStyleAlert; UIAlertAction *sureAction = UIAlertAction actionWithTitle:"確認(rèn)" style:UIAlertActionStyleDefault handler:sureHandler; UIAlertAction *cancelAction = UIAlertAction actionWithTitle:"取消" style:UIAlertActionStyleCancel handler:cancelHandler; alertController addAction:sur

33、eAction; alertController addAction:cancelAction; self presentViewController:alertController animated:YES completion:nil; /繪制角圖片 - (void)drawImageForImageView:(UIImageView *)imageView UIGraphicsBeginImageContext(imageView.bounds.size); /獲取上下文 CGContextRef context = UIGraphicsGetCurrentContext(); /設(shè)置線

34、條寬度 CGContextSetLineWidth(context, 6.0f); /設(shè)置顏色 CGContextSetStrokeColorWithColor(context, UIColor greenColor CGColor); /路徑 CGContextBeginPath(context); /設(shè)置起點(diǎn)坐標(biāo) CGContextMoveToPoint(context, 0, imageView.bounds.size.height); /設(shè)置下一個(gè)點(diǎn)坐標(biāo) CGContextAddLineToPoint(context, 0, 0); CGContextAddLineToPoint(context, imageView.bounds.size.width, 0); /渲染，連接起點(diǎn)和下一個(gè)坐標(biāo)點(diǎn) CGContextStrokePath(context); imageView.image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); /繪制線圖片 - (void)drawLineForI