前言
首先說明的是:原生的二維碼掃描有一個坑,那就是掃描范圍的確定。只要記得掃描范圍是X與Y互換位置,W與H互換位置,就沒有什麼問題了。
下面進入正題:
1.因為使用原生二維碼掃描,所以需要加入頭文件添加delegate
#import <AVFoundation/AVFoundation.h> <AVCaptureMetadataOutputObjectsDelegate>
2.接著是使用到的類
@property (strong,nonatomic)AVCaptureDevice * device; @property (strong,nonatomic)AVCaptureDeviceInput * input; @property (strong,nonatomic)AVCaptureMetadataOutput * output; @property (strong,nonatomic)AVCaptureSession * session; @property (weak, nonatomic) IBOutlet UIView *outputView;//xib中掃描的View @property (strong,nonatomic)AVCaptureVideoPreviewLayer * preview; @property (strong, nonatomic) NSTimer * timer;//為了做掃描動畫的定時器 @property (strong, nonatomic) UIImageView * lineImage;//掃描動畫的橫線
3.懶加載一個掃描動畫的圖片
-(UIImageView *)lineImage{ if (!_lineImage) { CGFloat outputW = self.outputView.frame.size.width; _lineImage = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0,outputW, 2)]; _lineImage.image = [UIImage imageNamed:@"ray"]; } return _lineImage; }
4.使用前的設置,我將它設置在了viewDidLoad當中
-viewDidLoad{ [super viewDidLoad]; // Device _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; // Input _input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil]; // Output _output = [[AVCaptureMetadataOutput alloc]init]; [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()]; // Session _session = [[AVCaptureSession alloc]init]; [_session setSessionPreset:AVCaptureSessionPresetHigh]; //連接輸入和輸出 if ([_session canAddInput:self.input]) { [_session addInput:self.input]; } if ([_session canAddOutput:self.output]) { [_session addOutput:self.output]; } //設置條碼類型 _output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode]; //設置條碼位置 CGFloat X = (ScreenW/2-100)/ScreenW; CGFloat Y = (ScreenH/2-100)/ScreenH; CGFloat W = 200/ScreenW; CGFloat H = 200/ScreenH; //設置掃描范圍(注意,X與Y交互,W與H交換) [_output setRectOfInterest:CGRectMake(Y, X, H, W)]; //添加掃描畫面 _preview =[AVCaptureVideoPreviewLayer layerWithSession:_session]; _preview.videoGravity =AVLayerVideoGravityResizeAspectFill; _preview.frame = CGRectMake(0, 0, ScreenW, ScreenH);//self.view.layer.bounds; [self.view.layer insertSublayer:_preview atIndex:0]; //開始掃描 [_session startRunning]; //添加掃描動畫定時器 [self.outputView addSubview:self.lineImage]; // Do any additional setup after loading the view from its nib. _timer = [NSTimer scheduledTimerWithTimeInterval:2.5f target:self selector:@selector(lineAction) userInfo:nil repeats:YES]; }
5.二維碼掃描的代理事件
-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection { NSString *stringValue; if ([metadataObjects count] >0){ //停止掃描 [_session stopRunning]; AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0]; stringValue = metadataObject.stringValue;//stringValue是掃描拿到的內容,更具內容進行後續工作。 } }
6.添加掃描動畫的事件
- (void)lineAction{ CGFloat outputW = self.outputView.frame.size.width; CGFloat outputH = self.outputView.frame.size.height; [UIView animateWithDuration:2.4f animations:^{ CGRect frame = CGRectMake(0, outputH, outputW, 2); self.lineImage.frame = frame; } completion:^(BOOL finished) { CGRect frame = CGRectMake(0, 0, outputW, 2); self.lineImage.frame = frame; }]; }
搞定......最後放上一張效果圖
總結
以上就是這篇文章的全部內容了,希望本文的內容對大家的學習或者工作能帶來一定的幫助,如果有疑問大家可以留言交流。