使用系统提供的AVFoundation 实现二维码扫描(带动画)
2015-10-06 00:35
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注意这里的扫描必须真机测试
模拟器上是看不出来效果的
//4.输入和输出设备的桥梁,负责input和output数据交互 if ([self.session canAddInput:input]) { //添加输入设备 [self.session addInput:input]; } if ([self.session canAddOutput:output]) { //添加输出设备 [self.session addOutput:output]; } //可用类型 //[output availableMetadataObjectTypes]; //5. /*
AVMetadataObjectTypeQRCode 二维码 */ //6.初始化要显示图像的layer //显示拍摄视频图像 AVCaptureVideoPreviewLayer *layer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session]; layer.frame = self.view.bounds; layer.contentsGravity = kCAGravityResizeAspectFill; [self.view.layer
insertSublayer:layer atIndex:0]; } //7.开始扫描 [self.session startRunning]; [self animationScan];}#pragma mark - 代理方法(可能会调用多次)- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection
*)connection{ //扫描成功 if (metadataObjects.count > 0) { //如果扫描成功就停止扫描 [self.session stopRunning]; //结果类 AVMetadataMachineReadableCodeObject *object = metadataObjects[0]; //获取扫描的数据 NSString *value = [object stringValue]; UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@"提示" message:value delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles:nil, nil]; [alert show]; } }#pragma mark -/** * 扫描动画 */- (void)animationScan{ [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(updateScanLineFrame)
userInfo:nil repeats:YES];}bool upMove;/** * 更新线的坐标 */- (void)updateScanLineFrame{ if (self.scanLineImageView.frame.origin.y <= 20) { //向下移动 upMove = NO; } else if(self.scanLineImageView.frame.origin.y >= self.backgroundImageView.frame.size.height - 20) {
//向上移动 upMove = YES; } CGRect frame = self.scanLineImageView.frame; if (upMove) { frame.origin.y--; } else { frame.origin.y++; } //重新修改坐标 self.scanLineImageView.frame = frame; }- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of
any resources that can be recreated.}@end
模拟器上是看不出来效果的
#import "ViewController.h" #import <AVFoundation/AVFoundation.h> @interface ViewController ()<AVCaptureMetadataOutputObjectsDelegate> //输入和输出设备的桥梁 @property (nonatomic, strong) AVCaptureSession *session; /** * <#Description#> */ @property (nonatomic, weak) UIImageView *backgroundImageView; /** * 线 */ @property (nonatomic, weak) UIImageView *scanLineImageView; @end @implementation ViewController - (UIImageView *)scanLineImageView { if (!_scanLineImageView) { UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"qr_scan_line"]]; imageView.frame = CGRectMake(0, 0, self.backgroundImageView.frame.size.width, 1); [self.backgroundImageView addSubview:imageView]; _scanLineImageView = imageView; } return _scanLineImageView; } - (UIImageView *)backgroundImageView { if (!_backgroundImageView) { int space = 40; UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"smk"]]; imageView.frame = CGRectMake(space, space, self.view.frame.size.width - 2 * space, self.view.frame.size.width - 2 * space); [self.view addSubview:imageView]; _backgroundImageView = imageView; } return _backgroundImageView; } - (AVCaptureSession *)session { if (!_session) { _session = [[AVCaptureSession alloc] init]; } return _session; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. /* AVCaptureDevice 设备 AVCaptureDeviceInput 输入设备 AVCaptureMetadataOutput 输出设备 AVCaptureSession 输入和输出设备的桥梁,负责input和output数据交互。 */ } /** * 开始扫描 * * @param sender <#sender description#> */ - (IBAction)startScan:(id)sender { if (!_session) { //1.设备 AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; //2.输入设备 AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil]; //3.输出设备 AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init]; //设置代理 [output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()]; <pre name="code" class="objc"> output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode,AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypeCode128Code];
//4.输入和输出设备的桥梁,负责input和output数据交互 if ([self.session canAddInput:input]) { //添加输入设备 [self.session addInput:input]; } if ([self.session canAddOutput:output]) { //添加输出设备 [self.session addOutput:output]; } //可用类型 //[output availableMetadataObjectTypes]; //5. /*
AVMetadataObjectTypeQRCode 二维码 */ //6.初始化要显示图像的layer //显示拍摄视频图像 AVCaptureVideoPreviewLayer *layer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session]; layer.frame = self.view.bounds; layer.contentsGravity = kCAGravityResizeAspectFill; [self.view.layer
insertSublayer:layer atIndex:0]; } //7.开始扫描 [self.session startRunning]; [self animationScan];}#pragma mark - 代理方法(可能会调用多次)- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection
*)connection{ //扫描成功 if (metadataObjects.count > 0) { //如果扫描成功就停止扫描 [self.session stopRunning]; //结果类 AVMetadataMachineReadableCodeObject *object = metadataObjects[0]; //获取扫描的数据 NSString *value = [object stringValue]; UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@"提示" message:value delegate:nil cancelButtonTitle:@"Cancel" otherButtonTitles:nil, nil]; [alert show]; } }#pragma mark -/** * 扫描动画 */- (void)animationScan{ [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(updateScanLineFrame)
userInfo:nil repeats:YES];}bool upMove;/** * 更新线的坐标 */- (void)updateScanLineFrame{ if (self.scanLineImageView.frame.origin.y <= 20) { //向下移动 upMove = NO; } else if(self.scanLineImageView.frame.origin.y >= self.backgroundImageView.frame.size.height - 20) {
//向上移动 upMove = YES; } CGRect frame = self.scanLineImageView.frame; if (upMove) { frame.origin.y--; } else { frame.origin.y++; } //重新修改坐标 self.scanLineImageView.frame = frame; }- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of
any resources that can be recreated.}@end
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