iOS 原生二维码扫描和生成
一、效果预览：
功能描述:WSLNativeScanTool是在利用原生API的条件下封装的二维码扫描工具，支持二维码的扫描、识别图中二维码、生成自定义颜色和中心图标的二维码、监测环境亮度、打开闪光灯这些功能；WSLScanView是参照微信封装的一个扫一扫界面，支持线条颜色、大小、动画图片、矩形扫描框样式的自定义；这个示例本身就是仿照微信的扫一扫功能实现的。
二、实现
主要代码如下：
- 初始化扫描识别对象
- (AVCaptureSession *)session{
if (_session == nil){
//获取摄像设备
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
//创建输入流
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
if (!input){
return nil;
}
//创建二维码扫描输出流
AVCaptureMetadataOutput *output = [[AVCaptureMetadataOutput alloc] init];
//设置代理 在主线程里刷新
[output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
//设置采集扫描区域的比例 默认全屏是（0，0，1，1）
//rectOfInterest 填写的是一个比例，输出流视图preview.frame为 x , y, w, h, 要设置的矩形快的scanFrame 为 x1, y1, w1, h1. 那么rectOfInterest 应该设置为 CGRectMake(y1/y, x1/x, h1/h, w1/w)。
CGFloat x = CGRectGetMinX(self.scanFrame)/ CGRectGetWidth(self.preview.frame);
CGFloat y = CGRectGetMinY(self.scanFrame)/ CGRectGetHeight(self.preview.frame);
CGFloat width = CGRectGetWidth(self.scanFrame)/ CGRectGetWidth(self.preview.frame);
CGFloat height = CGRectGetHeight(self.scanFrame)/ CGRectGetHeight(self.preview.frame);
output.rectOfInterest = CGRectMake(y, x, height, width);
// 创建环境光感输出流
AVCaptureVideoDataOutput *lightOutput = [[AVCaptureVideoDataOutput alloc] init];
[lightOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];
_session = [[AVCaptureSession alloc] init];
//高质量采集率
[_session setSessionPreset:AVCaptureSessionPresetHigh];
[_session addInput:input];
[_session addOutput:output];
[_session addOutput:lightOutput];
//设置扫码支持的编码格式(这里设置条形码和二维码兼容)
output.metadataObjectTypes = @[AVMetadataObjectTypeQRCode,
AVMetadataObjectTypeEAN13Code,
AVMetadataObjectTypeEAN8Code,
AVMetadataObjectTypeCode128Code];
}
return _session;
}
- 扫描出结果的代理方法
#pragma mark -- AVCaptureMetadataOutputObjectsDelegate
//扫描完成后执行
-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{
if (metadataObjects.count > 0){
AVMetadataMachineReadableCodeObject *metadataObject = [metadataObjects firstObject];
// 扫描完成后的字符
// NSLog(@"扫描出 %@",metadataObject.stringValue);
if(self.scanFinishedBlock != nil){
self.scanFinishedBlock(metadataObject.stringValue);
}
}
}
#pragma mark- AVCaptureVideoDataOutputSampleBufferDelegate的方法
//扫描过程中执行，主要用来判断环境的黑暗程度
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection{
if (self.monitorLightBlock == nil) {
return;
}
CFDictionaryRef metadataDict = CMCopyDictionaryOfAttachments(NULL,sampleBuffer, kCMAttachmentMode_ShouldPropagate);
NSDictionary *metadata = [[NSMutableDictionary alloc] initWithDictionary:(__bridge NSDictionary*)metadataDict];
CFRelease(metadataDict);
NSDictionary *exifMetadata = [[metadata objectForKey:(NSString *)kCGImagePropertyExifDictionary] mutableCopy];
float brightnessValue = [[exifMetadata objectForKey:(NSString *)kCGImagePropertyExifBrightnessValue] floatValue];
// NSLog(@"环境光感 ： %f",brightnessValue);
// 根据brightnessValue的值来判断是否需要打开和关闭闪光灯
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
BOOL result = [device hasTorch];// 判断设备是否有闪光灯
if ((brightnessValue < 0) && result) {
// 环境太暗，可以打开闪光灯了
}else if((brightnessValue > 0) && result){
// 环境亮度可以
}
if (self.monitorLightBlock != nil) {
self.monitorLightBlock(brightnessValue);
}
}
三、用法
- 实例化WSLNativeScanTool工具类和WSLScanView界面类；用法很简单，头文件里注释的也挺详细的。
//输出流视图
UIView *preview = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height - 0)];
[self.view addSubview:preview];
__weak typeof(self) weakSelf = self;
//构建扫描样式视图
_scanView = [[WSLScanView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height - 0)];
_scanView.scanRetangleRect = CGRectMake(60, 120, (self.view.frame.size.width - 2 * 60), (self.view.frame.size.width - 2 * 60));
_scanView.colorAngle = [UIColor greenColor];
_scanView.photoframeAngleW = 20;
_scanView.photoframeAngleH = 20;
_scanView.photoframeLineW = 2;
_scanView.isNeedShowRetangle = YES;
_scanView.colorRetangleLine = [UIColor whiteColor];
_scanView.notRecoginitonArea = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.5];
_scanView.animationImage = [UIImage imageNamed:@"scanLine"];
_scanView.myQRCodeBlock = ^{
[WSLNativeScanTool createQRCodeImageWithString:@"https://www.jianshu.com/u/e15d1f644bea" andSize:CGSizeMake(250, 250) andBackColor:[UIColor whiteColor] andFrontColor:[UIColor orangeColor] andCenterImage:[UIImage imageNamed:@"piao"]];
createQRCodeController.qrString = @"https://www.jianshu.com/u/e15d1f644bea";
};
_scanView.flashSwitchBlock = ^(BOOL open) {
[weakSelf.scanTool openFlashSwitch:open];
};
[self.view addSubview:_scanView];
//初始化扫描工具
_scanTool = [[WSLNativeScanTool alloc] initWithPreview:preview andScanFrame:_scanView.scanRetangleRect];
_scanTool.scanFinishedBlock = ^(NSString *scanString) {
NSLog(@"扫描结果 %@",scanString);
[weakSelf.scanTool sessionStopRunning];
[weakSelf.scanTool openFlashSwitch:NO];
};
_scanTool.monitorLightBlock = ^(float brightness) {
NSLog(@"环境光感 ： %f",brightness);
if (brightness < 0) {
// 环境太暗，显示闪光灯开关按钮
[weakSelf.scanView showFlashSwitch:YES];
}else if(brightness > 0){
// 环境亮度可以,且闪光灯处于关闭状态时，隐藏闪光灯开关
if(!weakSelf.scanTool.flashOpen){
[weakSelf.scanView showFlashSwitch:NO];
}
}
};
[_scanTool sessionStartRunning];
[_scanView startScanAnimation];
四、项目结构
五、其他补充
暂没
iOS 原生二维码扫描和生成
注：本文著作权归作者，由demo大师代发，拒绝转载，转载需要作者授权
