IOS 二维码扫码

引言

最近公司项目需要自定义一个二维码扫描界面，提前写了个小demo，可以自定义二维码样式和添加按钮，文字等，有详细的注释，代码可直接复制。

代码

#import "CustomScanView.h"
#import <AVFoundation/AVFoundation.h>

#define screenBounds [UIScreen mainScreen].bounds
@interface CustomScanView ()<AVCaptureMetadataOutputObjectsDelegate>

@property (nonatomic, strong) AVCaptureSession *session;
@property (nonatomic, strong) AVCaptureVideoPreviewLayer *layer;
@property (nonatomic, strong) NSTimer *timer;
@property (nonatomic, strong) UIImageView *line;
@property (nonatomic, strong) UIImageView *backRect;
@property (nonatomic, strong) UILabel *explainLabel;
// 用于扫码的线条动画
@property int num;
@property BOOL upOrdown;
@end

@implementation CustomScanView

- (void)viewDidLoad {


    [self startScan];

}

- (void)startScan {

    //获取摄像设备
    AVCaptureDevice * device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    //创建输入流
    AVCaptureDeviceInput * input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
    //创建输出流
    AVCaptureMetadataOutput * output = [[AVCaptureMetadataOutput alloc]init];
    //设置代理 在主线程里刷新
    [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];

    //初始化链接对象
    self.session = [[AVCaptureSession alloc]init];
    //高质量采集率
    [self.session setSessionPreset:AVCaptureSessionPresetHigh];

    [self.session addInput:input];
    [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.metadataObjectTypes=@[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code];

    self.layer = [AVCaptureVideoPreviewLayer layerWithSession:self.session];
    self.layer.videoGravity=AVLayerVideoGravityResizeAspectFill;
    self.layer.frame=self.view.layer.bounds;// 设置照相显示的大小
    [self.view.layer insertSublayer:self.layer atIndex:2];// 设置层级，可以在扫码时显示一些文字

    //开始捕获
    [self.session startRunning];

    //边框
    self.backRect = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 232, 232)];
    self.backRect.center = self.view.center;
    self.backRect.image = [UIImage imageNamed:@"Rectangle"];
    [self.view addSubview:self.backRect];

    // 线条
    self.upOrdown = NO;
    self.num =0;
    self.line = [[UIImageView alloc] initWithFrame:CGRectMake((screenBounds.size.width-232)/2+10, self.backRect.frame.origin.y, self.backRect.frame.size.width - 20, 3)];
    self.line.image = [UIImage imageNamed:@"Line.png"];
    [self.view addSubview:self.line];

    //文字提示
    self.explainLabel = [[UILabel alloc] initWithFrame:CGRectMake(30, self.backRect.frame.size.height+self.backRect.frame.origin.y + 30, screenBounds.size.width - 60, 30)];
    self.explainLabel.text = @"将方框对准二维码、条形码进行扫描";
    self.explainLabel.textColor = [UIColor whiteColor];
    self.explainLabel.textAlignment = NSTextAlignmentCenter;
    [self.view addSubview:self.explainLabel];

    self.timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(animation) userInfo:nil repeats:YES];
}

//扫描时会调用以下方法
-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{
    if (metadataObjects.count>0) {
        //[session stopRunning];
        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex : 0 ];
        //输出扫描字符串
        NSLog(@"%@",metadataObject.stringValue);
        // 关闭扫描，退出扫描界面
        [self.session stopRunning];
        [self.layer removeFromSuperlayer];
    }
}

// 扫描线条动画
-(void)animation
{
    if (self.upOrdown == NO) {
        self.num ++;
        self.line.frame = CGRectMake((screenBounds.size.width-232)/2+10, self.backRect.frame.origin.y+2*self.num, self.backRect.frame.size.width - 20, 3);
        if (2*self.num == 232) {
            self.upOrdown = YES;
        }
    }
    else {
        self.num --;
        self.line.frame = CGRectMake((screenBounds.size.width-232)/2+10, self.backRect.frame.origin.y+2*self.num, self.backRect.frame.size.width - 20, 3);
        if (self.num == 0) {
            self.upOrdown = NO;
        }
    }
}