一 生成二维码
20 某些二维码中间有图片，可以直接在imageView添加图片居中
//1.创建过滤器
CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
//2.恢复默认
[filter setDefaults];
//3.给过滤器添加数据
NSString *str = @"二维码学习"; //也直接输出网址，扫描会自动跳转
NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];
[filter setValue:data forKey:@"inputMessage"];
//4.获取输出二维码
CIImage *outputImage = [filter outputImage];
//5.显示二维码
self.imageView.image = [UIImage imageWithCIImage:outputImage];
//解决模糊方法
// self.imageView.image = [self createNonInterpolatedUIImageFromCIImage:outputImage withSize:200];
生成二维码解决方法
23 -(UIImage *)createNonInterpolatedUIImageFromCIImage:(CIImage *)image withSize:(CGFloat)size
{
CGRect extent = CGRectIntegral(image.extent);
CGFloat scale = MIN(size/CGRectGetWidth(extent), size/CGRectGetHeight(extent));
//1.创建bitmap
size_t width = CGRectGetWidth(extent) *scale;
size_t height = CGRectGetHeight(extent) *scale;
CGColorSpaceRef cs = CGColorSpaceCreateDeviceGray();
CGContextRef bitmapRef = CGBitmapContextCreate(nil, width, height, 8, 0, cs, (CGBitmapInfo)kCGImageAlphaNone);
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef bitmapImage = [context createCGImage:image fromRect:extent];
CGContextSetInterpolationQuality(bitmapRef, kCGInterpolationNone);
CGContextScaleCTM(bitmapRef, scale, scale);
CGContextDrawImage(bitmapRef, extent, bitmapImage);
//2.保存bitmap到图片
CGImageRef scaledImage = CGBitmapContextCreateImage(bitmapRef);
CGContextRelease(bitmapRef);
CGImageRelease(bitmapImage);
return [UIImage imageWithCGImage:scaledImage];
}
二 二维码识别
49 @interface ViewController ()<AVCaptureMetadataOutputObjectsDelegate>
@property (weak, nonatomic)AVCaptureSession *session;
@property (weak, nonatomic)AVCaptureVideoPreviewLayer *layer;
- (IBAction)scan:(UIButton *)sender {
//1.创建捕捉会话
AVCaptureSession *session = [[AVCaptureSession alloc] init];
self.session = session;
//2.设置输入设备 设置为摄像头
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
AVCaptureDeviceInput *inputDevice = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
[session addInput:inputDevice];
//3.设置输出方式 代理数据输出数据
AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
[session addOutput:output];
[output setMetadataObjectTypes:@[AVMetadataObjectTypeQRCode]];
//4.添加一个显示的layer 类似摄像头拍照阅览
AVCaptureVideoPreviewLayer *layer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
layer.frame = self.view.bounds;
[self.view.layer addSublayer:layer];
self.layer = layer;
//5.开始扫描
[session startRunning];
}
-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
if (metadataObjects.count > 0) {
//1.获取扫描结果
AVMetadataMachineReadableCodeObject *object = [metadataObjects lastObject];
self.outLabel.text = object.stringValue;
//2.停止扫描
[self.session stopRunning];
//3.移除图层
[self.layer removeFromSuperlayer];
}else{
NSLog(@"没有扫描到数据");
}
}
三 ZBarSDK的使用
导入必要的框架
1).快速集成
实现ZBarReaderDelegate协议
35 //二维码识别
-(void)sysbutbuttonclick{
//初始化相机控制器
ZBarReaderViewController *reader = [ZBarReaderViewController new];
//设置代理
reader.readerDelegate = self;
//基本适配
reader.supportedOrientationsMask = ZBarOrientationMaskAll;
//二维码/条形码识别设置
ZBarImageScanner *scanner = reader.scanner;
[scanner setSymbology: ZBAR_I25
config: ZBAR_CFG_ENABLE
to: 0];
//弹出系统照相机，全屏拍摄
[self presentViewController:reader animated:YES completion:nil];
}
- (void) imagePickerController: (UIImagePickerController*) reader
didFinishPickingMediaWithInfo: (NSDictionary*) info
{
NSLog(@"info=%@",info);
// 得到条形码结果
id<NSFastEnumeration> results =[info objectForKey: ZBarReaderControllerResults];
ZBarSymbol *symbol = nil;
for(symbol in results)
// EXAMPLE: just grab the first barcode
break;
NSLog(@"%@",symbol.data);
}
2).自定义窗口
实现ZBarReaderViewDelegate协议
38 //二维码识别
-(void)sysbutbuttonclick{
//初始化照相机窗口
ZBarReaderView *readview = [ZBarReaderView new];
//自定义大小
readview.frame = myScreen;
//自定义添加相关指示.........发挥各自的APP的想象力
//此处省略美化10000行代码...................
//………………………..
// 好进入正题—— 接着设置好代理
readview.readerDelegate = self;
//将其照相机拍摄视图添加到要显示的视图上
[self.view addSubview:readview];
//二维码/条形码识别设置
ZBarImageScanner *scanner = readview.scanner;
[scanner setSymbology: ZBAR_I25
config: ZBAR_CFG_ENABLE
to: 0];
//启动，必须启动后，手机摄影头拍摄的即时图像菜可以显示在readview上
[readview start];
}
-(void)readerView:(ZBarReaderView *)readerView didReadSymbols:(ZBarSymbolSet *)symbols fromImage:(UIImage *)image
{
ZBarSymbol *symbol = nil;
for (symbol in symbols) {
break;
}
NSLog(@"========%@==========",symbol.data);
}
