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;        }    }}