自定义扫描二维码界面

由于项目需求,程序需要实现自定义界面二维码扫描功能,所以我找了一下系统二维码扫描的方法。

下面是我封装代码:
.h里的代码:

#import <Foundation/Foundation.h>
#import <AVFoundation/AVFoundation.h>
@interface ZHSearchScanHelper : NSObject <AVCaptureMetadataOutputObjectsDelegate>

@property (strong, nonatomic) void(^ScanBlock)(NSString * str);

/* 输入输出中间桥梁 */
@property (strong, nonatomic) AVCaptureSession           * session;
/* 设备 */
@property (strong, nonatomic) AVCaptureDevice            * device;
/* 采集设备输入 */
@property (strong, nonatomic) AVCaptureDeviceInput       * input;
/* 捕捉元数据输出 */
@property (strong, nonatomic) AVCaptureMetadataOutput    * output;
/* 扫描的View */
@property (strong, nonatomic) UIView                     * scanView;
/* 捕捉视频预览层 */
@property (strong, nonatomic) AVCaptureVideoPreviewLayer * layer;
/* 图层父类 */
@property (strong, nonatomic) UIView                     * superView;


/* 为了做扫描动画的定时器 */
@property (strong, nonatomic) NSTimer                    * timer;
/* 扫描动画的横线 */
@property (strong, nonatomic) UIImageView                * lineImage;

+(instancetype)manager;

-(void)startRunning;
-(void)stopRunning;
-(void)stopSetView;
-(void)showLayer:(UIView *)viewController;
-(void)setscanningRect:(CGRect)scanRect scanView:(UIView *)scanView;

@end

.m里的代码:

+(instancetype)manager
{
    static ZHSearchScanHelper * manager = nil;
    static dispatch_once_t once_Token;
    dispatch_once(&once_Token, ^{
        manager = [[ZHSearchScanHelper alloc]init];
    });
    return manager;
}


-(instancetype)init
{
    if (self = [super init]) {
    
        // Session初始化
        _session = [[AVCaptureSession alloc]init];
        // 高质量采样率
        [_session setSessionPreset:AVCaptureSessionPresetHigh];
        
        // 避免模拟器运行崩溃
        if (!TARGET_IPHONE_SIMULATOR) {
            
            // Device
            _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
            
            // Input 输入流
            _input = [AVCaptureDeviceInput deviceInputWithDevice:_device error:nil];
            if ([_session canAddInput:_input])
            {
                [_session addInput:_input];
            }
            
            // Output 输出流
            _output = [[AVCaptureMetadataOutput alloc]init];
            // 设置代理 在主线程刷新
            [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
            if ([_session canAddOutput:_output])
            {
                [_session addOutput:_output];
            }
            
            // 设置扫码支持的编码格式
            // 条码类型 AVMetadataObjectTypeQRCode
            _output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode,
                                           AVMetadataObjectTypeEAN13Code,
                                           AVMetadataObjectTypeEAN8Code,
                                           AVMetadataObjectTypeCode128Code];
            
            // 更新界面
            _layer = [AVCaptureVideoPreviewLayer layerWithSession:_session];
            _layer.videoGravity = AVLayerVideoGravityResizeAspectFill;
        }
    }
    return self;
}


#pragma mark 方法
// 开始
-(void)startRunning
{
    if (!TARGET_IPHONE_SIMULATOR) {
        [_session startRunning];
    }
}


// 停止
-(void)stopRunning
{
    if (!TARGET_IPHONE_SIMULATOR) {
        [_session stopRunning];
    }
}


#pragma mark delegate
-(void)captureOutput:(AVCaptureOutput *)output didOutputMetadataObjects:(NSArray<__kindof AVMetadataObject *> *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
    NSString *stringValue;
    
    if (metadataObjects.count > 0) {
        
        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
        stringValue = metadataObject.stringValue;
        // 传值
        if (self.ScanBlock) {
            self.ScanBlock(stringValue);
        }
        // 停止
        [self stopSetView];
        
        NSLog(@"%@",stringValue);
    }
}


/* 停止设置 */
-(void)stopSetView
{
    // 结束
    [_session stopRunning];
    // 移除界面
    for (UIView * view in self.superView.subviews) {
        [view removeFromSuperview];
    }
    // 计时器停止
    [_timer invalidate];
    _timer = nil;
}


/*
 设置扫描区域
 @param scanRect 扫描范围
 @param scanRect 扫描框
 */
-(void)setscanningRect:(CGRect)scanRect scanView:(UIView *)scanView
{
    CGFloat x,y,width,height;
    
    x = scanRect.origin.y / _layer.frame.size.height;
    y = scanRect.origin.x / _layer.frame.size.width;
    width = scanRect.size.height / _layer.frame.size.height;
    height = scanRect.size.width / _layer.frame.size.width;
    
    _output.rectOfInterest = CGRectMake(x, y, width, height);
    
    self.scanView = scanView;
    if (self.scanView) {
        self.scanView.frame = scanRect;
        if (self.superView) {
            [self.superView addSubview:_scanView];
            [self setCover:_scanView];
        }
    }
}


/* 添加图层 */
-(void)showLayer:(UIView *)viewController
{
    _superView = viewController;
    _layer.frame = _superView.layer.frame;
    [_superView.layer insertSublayer:_layer atIndex:0];
}


//    167 167 167   32   居上50
/* 设置覆盖层界面 */
-(void)setCover:(UIView *)view
{
    UIColor * color = [UIColor blackColor];
    
    UIView * view_1 = [[UIView alloc]initWithFrame:CGRectMake(0, 0, self.superView.bounds.size.width, view.frame.origin.y)];
    view_1.backgroundColor = color;
    view_1.alpha = 0.8;
    [self.superView addSubview:view_1];
    
    UIView * view_2 = [[UIView alloc]initWithFrame:CGRectMake(0, view.frame.origin.y+view.frame.size.height, self.superView.bounds.size.width, self.superView.bounds.size.height-(view.frame.origin.y+view.frame.size.height))];
    view_2.backgroundColor = color;
    view_2.alpha = 0.8;
    [self.superView addSubview:view_2];
    
    UIView * view_3 = [[UIView alloc]initWithFrame:CGRectMake(0, view.frame.origin.y, view.frame.origin.x, view.frame.size.height)];
    view_3.backgroundColor = color;
    view_3.alpha = 0.8;
    [self.superView addSubview:view_3];
    
    UIView * view_4 = [[UIView alloc]initWithFrame:CGRectMake(view.frame.origin.x+view.frame.size.width, view.frame.origin.y, view.frame.origin.x, view.frame.size.height)];
    view_4.backgroundColor = color;
    view_4.alpha = 0.8;
    [self.superView addSubview:view_4];
    
    UIImageView * imageV = [[UIImageView alloc]initWithFrame:view.bounds];
    imageV.image = [UIImage imageNamed:@"fo_bi"];
    imageV.backgroundColor = [UIColor clearColor];
    [view addSubview:imageV];
    
    UILabel * label = [[UILabel alloc]initWithFrame:CGRectMake(0, view.frame.origin.y+view.frame.size.height+50*kScale, self.superView.bounds.size.width, 50*kScale)];
    label.text = @"将二维码/条码放入框内,即可自动扫描";
    label.textColor = JMColor(167, 167, 167);
    label.font = [UIFont systemFontOfSize:32*kScale];
    label.textAlignment = NSTextAlignmentCenter;
    label.backgroundColor = [UIColor clearColor];
    [self.superView addSubview:label];
    
    _lineImage = [[UIImageView alloc]initWithFrame:CGRectMake(20*kScale, 30*kScale, view.bounds.size.width-40*kScale, 16*kScale)];
    _lineImage.image = [UIImage imageNamed:@"green_line"];
    _lineImage.backgroundColor = [UIColor clearColor];
    [view addSubview:_lineImage];
    
    NSTimer *timer = [NSTimer timerWithTimeInterval:2.5 target:self selector:@selector(timerLineChangeFrame:) userInfo:@(YES) repeats:YES];
    [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
    self.timer = timer;
}


-(void)timerLineChangeFrame:(NSTimer *)timer
{
    [self animated];
}


#pragma mark 动画
- (void)animated
{
    _lineImage.frame = CGRectMake(20*kScale, 30*kScale, _scanView.bounds.size.width-40*kScale, 16*kScale);
    [UIView animateWithDuration:2.5 animations:^{
        [UIView setAnimationCurve:UIViewAnimationCurveLinear];
        _lineImage.frame = CGRectMake(20*kScale, _scanView.bounds.size.height-30*kScale-16*kScale, _lineImage.superview.bounds.size.width-40*kScale, 8*kScale);
    }];
}

在父类使用:
设置扫描界面

-(void)setScanView
{
    WeakSelf(weakSelf);
    CGSize windowSize = [UIScreen mainScreen].bounds.size;
    CGSize scanSize = CGSizeMake(windowSize.width * 3/5, windowSize.width *3/5);
    CGRect scanRect = CGRectMake((windowSize.width-scanSize.width)/2, 300*kScale, scanSize.width, scanSize.height);
    UIView * scanRectView = [UIView new];
    scanRectView.layer.borderColor = [UIColor clearColor].CGColor;
    scanRectView.layer.borderWidth = 0;

    [[ZHSearchScanHelper manager] showLayer:self.view];
    [[ZHSearchScanHelper manager] setscanningRect:scanRect scanView:scanRectView];
    [[ZHSearchScanHelper manager] setScanBlock:^(NSString *scanResult)
    {
        NSLog(@"---%@", scanResult);
        
        // 根据自己的需要对扫描结果进行处理
        // 获取数据
        [weakSelf getProductionData:scanResult];

    }];
    [[ZHSearchScanHelper manager] startRunning];
}

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