浅谈iOS7 AVFoundation 二维码扫描
iOS7,AVFoundation中现在已经内置支持一维和二维码的扫瞄,iOS6及之前的想要扫瞄二维码,还是需要添加第三方库ZXing和ZBar。
ZBar生成二维码:http://blog.csdn.net/cafei111/article/details/8924297
先添加AVFoundation.framework
#import
<AVFoundation/AVFoundation.h>
@interface QRcodeViewController
:UIViewController<AVCaptureMetadataOutputObjectsDelegate>
@property
(strong,nonatomic)AVCaptureDevice *device;
@property
(strong,nonatomic)AVCaptureDeviceInput *input;
@property
(strong,nonatomic)AVCaptureMetadataOutput *output;
@property
(strong,nonatomic)AVCaptureSession *session;
@property
(strong,nonatomic)AVCaptureVideoPreviewLayer *preview;
@end
-
(void)setupCamera
{
// Device
self.device =
[AVCaptureDevicedefaultDeviceWithMediaType:AVMediaTypeVideo];
// Input
self.input =
[AVCaptureDeviceInputdeviceInputWithDevice:self.deviceerror:nil];
// Output
self.output =
[[AVCaptureMetadataOutputalloc]init];
[self.outputsetMetadataObjectsDelegate:selfqueue:dispatch_get_main_queue()];
// Session
self.session =
[[AVCaptureSessionalloc]init];
[self.sessionsetSessionPreset:AVCaptureSessionPresetHigh];
if
([self.sessioncanAddInput:self.input])
{
[self.sessionaddInput:self.input];
}
if
([self.sessioncanAddOutput:self.output])
{
[self.sessionaddOutput:self.output];
}
// 条码类型
self.output.metadataObjectTypes =@[AVMetadataObjectTypeQRCode];
// Preview
self.preview =
[AVCaptureVideoPreviewLayerlayerWithSession:self.session];
self.preview.videoGravity
=AVLayerVideoGravityResizeAspectFill;
self.preview.frame
=CGRectMake(0,0,self.view.frame.size.width,self.view.frame.size.height);
[self.view.layeraddSublayer:self.preview];
// Start
[self.sessionstartRunning];
}
条码类型有如下几种:
1
2
3
4
5
6
7
8
9
10
AVMetadataObjectTypeUPCECode
AVMetadataObjectTypeCode39Code
AVMetadataObjectTypeCode39Mod43Code
AVMetadataObjectTypeEAN13Code
AVMetadataObjectTypeEAN8Code
AVMetadataObjectTypeCode93Code
AVMetadataObjectTypeCode128Code
AVMetadataObjectTypePDF417Code
AVMetadataObjectTypeQRCode
AVMetadataObjectTypeAztecCode
扫瞄到二维码之后,会调用delegate
#pragma
mark AVCaptureMetadataOutputObjectsDelegate
-
(void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputMetadataObjects:(NSArray *)metadataObjects
fromConnection:(AVCaptureConnection *)connection
{
NSString
*stringValue;
if ([metadataObjectscount]
>0) {
AVMetadataMachineReadableCodeObject *metadataObject =
[metadataObjectsobjectAtIndex:0];
stringValue = metadataObject.stringValue;
}
[_sessionstopRunning];
[selfdismissViewControllerAnimated:YEScompletion:^{
UIAlertView *alert =
[[UIAlertViewalloc]initWithTitle:nil
message:stringValue
delegate:nil
cancelButtonTitle:@"OK"
otherButtonTitles:nil,nil];
[alertshow];
}];
}
这个委托方法里面的字符串stringValue就是二维码的内容
郑重声明:本站内容如果来自互联网及其他传播媒体,其版权均属原媒体及文章作者所有。转载目的在于传递更多信息及用于网络分享,并不代表本站赞同其观点和对其真实性负责,也不构成任何其他建议。