每一步：添加 AVFoundation.framework 库
General > Linked Frameworks and Libraries
第二步：代码集成
#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>
//1. 有个素材
@interface ViewController ()<AVCaptureMetadataOutputObjectsDelegate>
/** 2.输入设置 采集摄像头捕捉到的信息 */
@property (nonatomic, strong) AVCaptureDeviceInput *input;
/** 3.输出设备 解析输入设备采集到的信息 */
@property (nonatomic, strong) AVCaptureMetadataOutput *output;
/** 4. layer (特殊图层 能够展示摄像头采集到的画面) 展示输入设备采集到的信息 */
@property (nonatomic, strong) AVCaptureVideoPreviewLayer *layer;
/** 5.关联输入设备和输出设备 会话 */
@property (nonatomic, strong) AVCaptureSession *session;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
}
// 点击扫描二维码
- (IBAction)click:(id)sender {
// 1.创建输入设备
// AVMediaTypeVideo 摄像头
// AVMediaTypeAudio 麦克风
// AVCaptureDeviceInput 输入设备 default默认后置
// AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
NSArray *allDevice = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
self.input = [AVCaptureDeviceInput deviceInputWithDevice:[allDevice firstObject] error:nil];
//2. 创建输出设备
self.output = [[AVCaptureMetadataOutput alloc]init];
//解析 返回的数据
//设置输出设备的代理 返回解析后的数据
[self.output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
//3.创建会话
self.session = [[AVCaptureSession alloc]init];
//4.关联 会话和设备
if ([self.session canAddInput:self.input]) {
[self.session addInput:self.input];
}
if ([self.session canAddOutput:self.output]) {
[self.session addOutput:self.output];
}
//告诉数据类型 AVMetadataObjectTypeQRCode 二维码
self.output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];
// 扫描框大小 整个屏幕
[self.session setSessionPreset:AVCaptureSessionPreset640x480];
//5.指定layer 的 frame 然后添加到 view上
self.layer = [[AVCaptureVideoPreviewLayer alloc]initWithSession:self.session];
self.layer.frame = self.view.bounds;
[self.view.layer addSublayer:self.layer];
//开启会话
[self.session startRunning];
}
//扫描出结果后就会调用的方法
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{
AVMetadataMachineReadableCodeObject *objc = [metadataObjects firstObject];
NSString *str = objc.stringValue;
NSLog(@"%@",str);
//停止扫描
[self.session stopRunning];
//移除 layer
[self.layer removeFromSuperlayer];
}
@end
