iOS7 AVFoundation 二维码扫瞄
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];
}
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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];
}];
}