iOS 二维码扫描

最新推荐文章于 2025-07-21 12:17:10 发布

原创最新推荐文章于 2025-07-21 12:17:10 发布 · 227 阅读

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#二维码

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原生二维码扫描

个人是比较支持用原生二维码扫描的，这里也就仅仅以原生二维码扫面为范例

1.原生扫描用到的几个类

@property (strong,nonatomic)AVCaptureDevice * device;
@property (strong,nonatomic)AVCaptureDeviceInput * input;
@property (strong,nonatomic)AVCaptureMetadataOutput * output;
@property (strong,nonatomic)AVCaptureSession * session;
@property (strong,nonatomic)AVCaptureVideoPreviewLayer * preview;

2.在viewDidLoad里创建它们

// Device
_device = [AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];

// Input
_input = [AVCaptureDeviceInputdeviceInputWithDevice:self.deviceerror:nil];

// Output
_output = [[AVCaptureMetadataOutputalloc]init];
[_outputsetMetadataObjectsDelegate:selfqueue:dispatch_get_main_queue()];

// Session
_session = [[AVCaptureSessionalloc]init];
[_sessionsetSessionPreset:AVCaptureSessionPresetHigh];

连接输入和输出

if ([_sessioncanAddInput:self.input])
{
    [_sessionaddInput:self.input];
}

if ([_sessioncanAddOutput:self.output])
{
    [_sessionaddOutput:self.output];
}

设置条码类型

_output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];

添加扫描画面

_preview =[AVCaptureVideoPreviewLayerlayerWithSession:_session];
_preview.videoGravity =AVLayerVideoGravityResizeAspectFill;
_preview.frame =self.view.layer.bounds;
[self.view.layerinsertSublayer:_previewatIndex:0];

开始扫描

[_sessionstartRunning];

最后实现协议AVCaptureMetadataOutputObjectsDelegate
- (void)captureOutput:(AVCaptureOutput )captureOutput didOutputMetadataObjects:(NSArray )metadataObjects fromConnection:(AVCaptureConnection *)connection
{
NSString *stringValue;
if ([metadataObjectscount] >0){
//停止扫描
[_sessionstopRunning];
AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjectsobjectAtIndex:0];
stringValue = metadataObject.stringValue;
}
}