IOS7自带的二维码扫描功能

#pragma mark AVCaptureMetadataOutputObjectsDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection
{
    
    NSString *stringValue;
    
    if ([metadataObjects count] >0)
    {
        AVMetadataMachineReadableCodeObject * metadataObject = [metadataObjects objectAtIndex:0];
        stringValue = metadataObject.stringValue;
        _readStr=stringValue;
        if ([_readStr hasPrefix:@"##px"])
        {
            //            NSLog(@"是");
            _friend_id = [_readStr substringFromIndex:4];
            [self requestHTTPWithNum:1];
        }
        else
        {
            //            NSLog(@"不是");
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:_readStr delegate:self cancelButtonTitle:@"取消" otherButtonTitles:@"确定", nil];
            [alert show];
        }

    }
    
    [_session stopRunning];

IOS7自带的二维码扫描功能

原文：http://8287272.blog.51cto.com/8277272/1659554