iOS---扫码(二维码/条形码)
我在两个项目中分别使用了ZBarSDK与系统自带的扫码，今天主要介绍一下系统自带的扫码（AVCaptureSession），需导入
#import <AVFoundation/AVFoundation.h>
1。系统自带的
（1）先声明两个属性
@property (nonatomic,strong)AVCaptureSession *session; //捕捉会话
@property (nonatomic,strong)AVCaptureVideoPreviewLayer *layer; //扫描图层
（2）添加输入设备并检查设备是否支持相机
//添加输入设备并创建捕捉会话
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
self.session = [[AVCaptureSession alloc] init];
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
NSError *error=nil;
if (input) {
[self.session addInput:input];
}else{
NSLog(@"获取摄像设备error:%@",[error localizedDescription]);
}
//检查相机状态
AVAuthorizationStatus status = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
if(status == AVAuthorizationStatusAuthorized) {
[self setupCamera];
} else {
[self showStr:@"您没有权限访问相机" withSelf:self withMinier:2.0];
}
(3)在能打开相机的情况下创扫描图层
//添加输出数据
AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
//高质量采集率
[self.session setSessionPreset:AVCaptureSessionPresetHigh];
[self.session addOutput:output];
//设置扫码支持的编码格式(如下设置条形码和二维码兼容)
[output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code]];
//添加扫描图层
self.layer = [AVCaptureVideoPreviewLayer layerWithSession:self.session];
self.layer.frame = CGRectMake((ScreenWidth-250)/2,ScreenHeight*0.25, 250, 250);
self.layer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[self.view.layer addSublayer:self.layer];
(4)开始扫描
[self.session startRunning];
(5)如果扫描到数据会调用代理方法 （遵守AVCaptureMetadataOutputObjectsDelegate协议）
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection { }
注意：xcode8的 用户在使用这个功能的时候要先再plist。info 中添加项： Privacy - Camera Usage Description 是否允许此App使用你的相机?
2.ZBarSDK
参考自：http://www.mincoder.com/article/4419.shtml
