AVCaptureMetadataOutput這個(gè)類的 rectOfInterest 屬性是基于橫屏的坐標(biāo)(橫屏坐標(biāo)原點(diǎn)也在左上方,但是寬高互換,橫縱坐標(biāo)互換)
初始化視頻捕獲
//獲取攝像設(shè)備
AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
//創(chuàng)建輸入流
AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
if (!input) return;
//創(chuàng)建輸出流
AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc]init];
//設(shè)置代理
dispatch_queue_t dispatchSerialQueue = dispatch_queue_create("OutputQueue", DISPATCH_QUEUE_SERIAL);
[output setMetadataObjectsDelegate:self queue:dispatchSerialQueue];
//設(shè)置有效掃描區(qū)域
CGRect scanCrop=[self getScanCrop:_scanWindow.bounds readerViewBounds:self.view.frame];
output.rectOfInterest = scanCrop;
//初始化鏈接對(duì)象
AVCaptureSession * session = [[AVCaptureSession alloc]init];
//高質(zhì)量采集率
[session setSessionPreset:AVCaptureSessionPreset1920x1080];
[session addInput:input];
[session addOutput:output];
//設(shè)置掃碼支持的編碼格式(如下設(shè)置條形碼和二維碼兼容),EAN碼符號(hào)有標(biāo)準(zhǔn)版（EAN-13）和縮短版（EAN-8）兩種倒慧。標(biāo)準(zhǔn)版表示13位數(shù)字灾票，又稱為EAN13碼，縮短版表示8位數(shù)字览祖，又稱EAN8
output.metadataObjectTypes=@[AVMetadataObjectTypeQRCode,//QR Code
AVMetadataObjectTypeEAN13Code,//EAN-13
AVMetadataObjectTypeEAN8Code,//EAN-8
AVMetadataObjectTypeCode128Code];//Code-128
//用于展示被輸入設(shè)備捕獲的視頻
AVCaptureVideoPreviewLayer * layer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
layer.videoGravity=AVLayerVideoGravityResizeAspectFill;
layer.frame=self.view.layer.bounds;
[self.view.layer insertSublayer:layer atIndex:0];
//開始捕獲
[session startRunning];
- 采集到的數(shù)據(jù)通過AVCaptureMetadataOutputObjectsDelegate 協(xié)議里方法
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
來獲取.
- 從相冊(cè)中讀取二維碼
//初始化一個(gè)監(jiān)測(cè)器
CIDetector*detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:@{ CIDetectorAccuracy : CIDetectorAccuracyHigh }];
//讀取圖片里的 features
NSArray *features = [detector featuresInImage:[CIImage imageWithCGImage:image.CGImage]];
//讀取第一個(gè) feature
CIQRCodeFeature *feature = [features objectAtIndex:0];
//再讀取各項(xiàng)所需要的屬性
NSString *scannedResult = feature.messageString;//掃描的 QRCode 的信息
......
- 打開手電筒
//獲取設(shè)備
BOOL on = NO//默認(rèn)是關(guān)閉手電筒的
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if ([device hasTorch] && [device hasFlash])//先判斷是否有閃光燈且是否有手電筒
{
//在嘗試配置設(shè)備的硬件相關(guān)屬性之前嫉鲸，必須調(diào)用此方法为牍。 當(dāng)成功鎖定設(shè)備以供您的代碼配置時(shí)馅精，此方法返回YES次慢。 配置設(shè)備屬性后旁涤，請(qǐng)調(diào)用unlockForConfiguration以釋放配置鎖定翔曲，并允許其他應(yīng)用程序進(jìn)行更改。
[device lockForConfiguration:nil];
if (on) {
[device setTorchMode:AVCaptureTorchModeOn];
[device setFlashMode:AVCaptureFlashModeOn];
} else {
[device setTorchMode:AVCaptureTorchModeOff];
[device setFlashMode:AVCaptureFlashModeOff];
}
[device unlockForConfiguration];
}
