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#import "BZViewController.h"
#import <AVFoundation/AVFoundation.h>
@interface BZViewController ()<AVCaptureMetadataOutputObjectsDelegate>
@property (strong,nonatomic)AVCaptureDevice *device;
@property (strong,nonatomic)AVCaptureDeviceInput *input;//调用所有的输入硬件。例如摄像头和麦克风
@property (strong,nonatomic)AVCaptureMetadataOutput *output;
@property (strong,nonatomic)AVCaptureSession *session;// 控制输入和输出设备之间的数据传递
@property (strong,nonatomic)AVCaptureVideoPreviewLayer *preview;//镜头捕捉到得预览图层
@end

@implementation BZViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];
    view.backgroundColor = [UIColor greenColor];
    [self.view addSubview:view];
   
    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(50, 50, 100, 40)];
    button.backgroundColor = [UIColor redColor];
    [button setTitle:@"btn" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
    [view addSubview:button];
}

- (void)btnClick{
    // Device
    self.device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
   
    // Input
    self.input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];
   
    // Output
    self.output = [[AVCaptureMetadataOutput alloc]init];
    [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
   
    // Session
    self.session = [[AVCaptureSession alloc]init];
    [self.session setSessionPreset:AVCaptureSessionPresetHigh];
    if ([self.session canAddInput:self.input])
    {
        [self.session addInput:self.input];
    }
    if ([self.session canAddOutput:self.output])
    {
        [self.session addOutput:self.output];
    }
   
    // 条码类型
    self.output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];
   
    // Preview
    self.preview = [AVCaptureVideoPreviewLayer layerWithSession:self.session];
    self.preview.videoGravity =AVLayerVideoGravityResizeAspectFill;
    self.preview.frame =CGRectMake(0,0,self.view.frame.size.width,self.view.frame.size.height);
    [self.view.layer addSublayer:self.preview];
   
    // Start
    [self.session startRunning];
}

#pragma mark AVCaptureMetadataOutputObjectsDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
    NSString *stringValue;
   
    if ([metadataObjects count] >0) {
        AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjects objectAtIndex:0];
        stringValue = metadataObject.stringValue;
    }
   
    [_session stopRunning];
    NSLog(@"%@",stringValue);
  
}