iOS7 自带的二维码扫描功能进行了封装
import "FJQRScanner.h"
FJQRScanner *scannerView = [FJQRScanner scannerWithFrame:self.view.bounds delegate:self];
[scannerView setCaptured:^(NSString *result) {
NSLog(@"block Capture : %@",result);
}];
[self.view addSubview:scannerView];
[scannerView start];
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