• 輸入設備
• 輸出設備
• 會話
• 預覽圖層
• 開啟會話

導入框架 權限

#import <AVFoundation/AVFoundation.h>

    <key>NSCameraUsageDescription</key>
    <string></string>

輸入設備

//輸出設備
@property(strong,nonatomic)AVCaptureDeviceInput *deviceInput;
//----------------------------------------------------------------
    //1.1攝像頭的設備 默認后置攝像頭
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    //1.2創(chuàng)建攝像頭的輸入設備
    self.deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];

輸出設備

//輸出設備 Metadata元數(shù)據(jù)
@property(strong,nonatomic)AVCaptureMetadataOutput *output;
//----------------------------------------------------------------
//2.輸出設備 ->解析數(shù)據(jù)
    self.output = [[AVCaptureMetadataOutput alloc] init];
//設置代理 用來獲取數(shù)據(jù)
    [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

#pragma mark - AVCaptureMetadataOutputObjectsDelegate
//掃描到二維碼數(shù)據(jù)時調用
//metadataObjects:掃描到的數(shù)據(jù)
-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{
//掃描到數(shù)據(jù)之后 移除圖層
    [self.previewLayer removeFromSuperlayer];
    //停止會話
    [self.session stopRunning];
    for (AVMetadataMachineReadableCodeObject *objc in metadataObjects) {
        //二維碼掃描出來的結果是字符串
        NSLog(@"%@",objc.stringValue);
        //創(chuàng)建safari控制器#import <SafariServices/SafariServices.h>
        SFSafariViewController *safariVC = [[SFSafariViewController alloc] initWithURL:[NSURL URLWithString:objc.stringValue]];
        [self presentViewController:safariVC animated:YES completion:nil];
    }
}

會話

//會話
@property(nonatomic,strong)AVCaptureSession *session;
//----------------------------------------------------------------
    //3.會話 ->連接輸入和輸出設備
    self.session = [[AVCaptureSession alloc] init];
    //連接設備
    if([self.session canAddInput:self.deviceInput]){
        [self.session addInput:self.deviceInput];
    }
    if([self.session canAddOutput:self.output]){
        [self.session addOutput:self.output];
    }
    //設置輸出設備的解析數(shù)據(jù)的類型
    //AVMetadataObjectTypeQRCode 二維碼
    self.output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];

預覽圖層

//圖層
@property(nonatomic,strong)AVCaptureVideoPreviewLayer *previewLayer;
//-------------------------------------------------------------------------
    //4.預覽的圖層
    self.previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
    //添加圖層
    [self.view.layer addSublayer:self.previewLayer];
    //設置圖層的大小
    self.previewLayer.frame = self.view.bounds;

開啟會話

    //5.開啟會話
    [self.session startRunning];