#import "ScanQRCoreViewController.h"
@import AVFoundation;
#define TOP (kScreenH-220-kNavbarHeight)/2
#define LEFT (kScreenW-220)/2
#define kScanRect CGRectMake(LEFT, TOP, 220, 220)
@interface ScanQRCoreViewController ()<AVCaptureMetadataOutputObjectsDelegate>{
int num;
BOOL upOrdown;
}
@property (nonatomic, strong) AVCaptureDevice * device;
@property (nonatomic, strong) AVCaptureDeviceInput * input;
@property (nonatomic, strong) AVCaptureMetadataOutput * output;
@property (nonatomic, strong) AVCaptureSession * session;
@property (nonatomic, strong) AVCaptureVideoPreviewLayer * preview;
@property (nonatomic, strong) NSTimer * timer;
@property (nonatomic, strong) UIImageView * line;
@property (nonatomic, strong) UILabel *descriptionLabel;
@end
@implementation ScanQRCoreViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.title = @"扫一扫";
self.view.backgroundColor = [UIColor whiteColor];
[self configView];
}
-(void)configView{
UIImageView * imageView = [[UIImageView alloc]initWithFrame:kScanRect];
imageView.image = [UIImage imageNamed:@"scan_border"];
[self.view addSubview:imageView];
upOrdown = NO;
num =0;
_line = [[UIImageView alloc] initWithFrame:CGRectMake(LEFT, TOP+10, 220, 2)];
_line.image = [UIImage imageNamed:@"scan_line"];
[self.view addSubview:_line];
_descriptionLabel = [[UILabel alloc] init];
_descriptionLabel.textColor = [UIColor whiteColor];
_descriptionLabel.font = [UIFont systemFontOfSize:14];
_descriptionLabel.textAlignment = NSTextAlignmentCenter;
_descriptionLabel.text = @"将二维码/条码放入框内，即可自动扫描";
[self.view addSubview:_descriptionLabel];
[_descriptionLabel mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(imageView.mas_bottom).offset(18);
make.centerX.equalTo(self.view);
}];
_timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(animation) userInfo:nil repeats:YES];
}
-(void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self setCropRect:kScanRect];//view添加遮罩效果
[self setupCamera];//启动摄像头
}
-(void)animation {//扫描条动画效果
if (upOrdown == NO) {
num ++;
_line.frame = CGRectMake(LEFT, TOP+10+2*num, 220, 2);
if (2*num == 200) {
upOrdown = YES;
}
}
else {
num --;
_line.frame = CGRectMake(LEFT, TOP+10+2*num, 220, 2);
if (num == 0) {
upOrdown = NO;
}
}
}
- (void)setCropRect:(CGRect)cropRect{
CAShapeLayer *cropLayer = [[CAShapeLayer alloc] init];
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:self.view.bounds cornerRadius:0];
UIBezierPath *rectPath = [UIBezierPath bezierPathWithRect:cropRect];
[path appendPath:rectPath];
[cropLayer setFillRule:kCAFillRuleEvenOdd];//生成空心遮罩
[cropLayer setPath:path.CGPath];
[cropLayer setFillColor:[UIColor blackColor].CGColor];
[cropLayer setOpacity:0.3];
[cropLayer setNeedsDisplay];
[self.view.layer addSublayer:cropLayer];
}
- (void)setupCamera {
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if (device==nil) {
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"设备没有摄像头" preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
}]];
[self presentViewController:alert animated:YES completion:nil];
return;
}
// 1.Device 获取摄像设备
_device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
// 2.Input 创建输入流
_input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];
// 3.Output 创建输出流
_output = [[AVCaptureMetadataOutput alloc]init];
// 4.设置代理 在主线程里刷新
[_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
// 设置扫描区域
CGFloat top = TOP/kScreenH;
CGFloat left = LEFT/kScreenW;
CGFloat width = 220/kScreenW;
CGFloat height = 220/kScreenH;
///top 与 left 互换 width 与 height 互换
[_output setRectOfInterest:CGRectMake(top,left, height, width)];
// 5.Session 初始化会话对象
_session = [[AVCaptureSession alloc]init];
// 高质量采集率
[_session setSessionPreset:AVCaptureSessionPresetHigh];
// 5.1 添加会话输入
if ([_session canAddInput:self.input]) {
[_session addInput:self.input];
}
// 5.2 添加会话输出
if ([_session canAddOutput:self.output]) {
[_session addOutput:self.output];
}
// 6.设置输出数据类型
// 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]];
// 7.Preview 实例化预览图层 传递_session是为了告诉图层将来显示什么内容
_preview =[AVCaptureVideoPreviewLayer layerWithSession:_session];
_preview.videoGravity = AVLayerVideoGravityResizeAspectFill;
_preview.frame =self.view.layer.bounds;
// 8.将图层插入当前视图
[self.view.layer insertSublayer:_preview atIndex:0];
// 9.Start 启动会话
[_session startRunning];
}
#pragma mark AVCaptureMetadataOutputObjectsDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
NSString *stringValue;
if ([metadataObjects count] >0) {
//停止扫描
[_session stopRunning];
[_timer setFireDate:[NSDate distantFuture]];
AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
stringValue = metadataObject.stringValue;
NSLog(@"扫描结果：%@",stringValue);
if ([stringValue isEqualToString:@""]) {
[self.view showMsg:@"无扫描信息"];
return;
}
if (_session != nil && _timer != nil) {
[_session startRunning];
[_timer setFireDate:[NSDate date]];
}
//扫描到二维码/条形码信息后返回上一界面并传回扫描结果
if (self.numBlock) {
self.numBlock(stringValue);
}
[self.navigationController popViewControllerAnimated:YES];
} else {
NSLog(@"无扫描信息");
return;
}
}
@end
ScanQRCore.gif
