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objective-c二維碼的掃碼與生成

objective-c二維碼的掃碼與生成 掃描二維碼 生成二維碼

1.掃描二維碼

獲取輸出設備（以後是攝像頭）

AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

依據輸出設備獲取輸出對象

AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];

創立輸入對象

AVCaptureMetadataOutput *output = [AVCaptureMetadataOutput new];

設置代理監聽對象輸入的數據，在主線程回調

[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

創立會話

AVCaptureSession *session = [AVCaptureSession new];

//完成高質量的輸入和攝像，默許值為AVCaptureSessionPresetHigh，可以不寫
[session setSessionPreset:AVCaptureSessionPresetHigh];

添加輸出輸入到會話中（判別session能否已滿）

if ([session canAddInput:input]) {
    [session addInput:input];
}
if ([session canAddOutput:output]) {
    [session addOutput:output];
}

設置輸入對象的輸入什麼樣的數據（二維碼、條碼）

output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeCode128Code,AVMetadataObjectTypeCode93Code,AVMetadataObjectTypeCode39Code,AVMetadataObjectTypeCode39Mod43Code,AVMetadataObjectTypeEAN8Code,AVMetadataObjectTypeEAN13Code,AVMetadataObjectTypeUPCECode,AVMetadataObjectTypePDF417Code,AVMetadataObjectTypeAztecCode];

創立預覽圖層

AVCaptureVideoPreviewLayer *previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:session];
[previewLayer setVideoGravity:AVLayerVideoGravityResizeaspectFill];
previewLayer.frame = self.view.bounds;
[self.view.layer insertSublayer:previewLayer atIndex:0];

設置無效掃描區域

CGRect rect = CGRectMake(0.1,0.1,0.8,0.8);
output.rectOfInterest = rect;

設置周邊空白區域（兩頭掃描區域通明度比其他中央低）

UIView *maskView = [[UIView alloc] initWithFrame:self.view.bounds];
maskView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.4f];
[self.view addSubview:maskView];
UIBezierPath *rectPath = [UIBezierPath bezierPathWithRect:self.view.bounds];
[rectPath appendPath:[[UIBezierPath bezierPathWithRoundedRect:CGRectMake(20.0f, 20.0f, 200.0f, 200.0f) cornerRadius:1] bezierPathByReversingPath]];
CAShapeLayer *shapeLayer = [CAShapeLayer layer];
shapeLayer.path = rectPath.CGPath;
maskView.layer.mask = shapeLayer;

掃描成功後的回調

- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{
    if (metadataObjects.count > 0) {
        //取出掃描到得數據
        AVMetadataMachineReadableCodeObject *obj = [metadataObjects lastObject];
        if (obj) {
            NSLog(@"result = %@",[obj stringValue]);
        }
   }
}

2.生成二維碼

二維碼濾鏡

CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];

設置濾鏡的默許屬性

[filter setDefaults];

將字符串轉成二進制數據

NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];

經過KVO設置濾鏡inputmessage數據

[filter setValue:data forKey:@"inputMessage"];

獲取濾鏡輸入的圖片

CIImage *outputImage = [filter outputImage];

//轉成UIImage前往
UIImage *image = [UIImage imageWithCIImage:outputImage];

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