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////  ViewController.m//  扫描二维码////  Created by 高恒伟521 on 16/1/23.//  Copyright © 2016年 gds. All rights reserved.//#import "ViewController.h"#import <AVFoundation/AVFoundation.h>@interface ViewController ()<AVCaptureMetadataOutputObjectsDelegate>/** *  输入设备 */@property(nonatomic,strong)AVCaptureDeviceInput *input;/** *  输出设备 */@property(nonatomic,strong)AVCaptureMetadataOutput *output;/** *  会话 */@property(nonatomic,strong)AVCaptureSession *session;/** *  展示内容的图层特殊的图层.给用户看的 */@property(nonatomic,strong)AVCaptureVideoPreviewLayer *preiewLayer;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];    self.input = [[AVCaptureDeviceInput alloc]initWithDevice:[devices firstObject] error:nil];        self.output = [[AVCaptureMetadataOutput alloc]init];    self.session = [[AVCaptureSession alloc]init];        if ([self.session canAddInput:self.input]) {        [self.session addInput:self.input];    }    if ([self.session canAddOutput:self.output]) {        [self.session addOutput:self.output];    }    /**     *  输出设备的解析     */        [self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];    /**     *  设置解析类型     */     NSLog(@"%@",[self.output availableMetadataObjectTypes]);    self.output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];    /**     *  特使的layer展示.初始化     */    self.preiewLayer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:self.session];        self.preiewLayer.frame = self.view.layer.bounds;    [self.view.layer addSublayer:self.preiewLayer];        //设置扫描的大小    [self.session setSessionPreset:AVCaptureSessionPresetHigh];                [self.session startRunning];}//解析完毕就会调用- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection {        AVMetadataMachineReadableCodeObject *object = [metadataObjects firstObject];    NSLog(@"%@",object.stringValue);        [self.preiewLayer removeFromSuperlayer];    [self.session stopRunning];        }@end
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