学步园

******************************

二维码扫描时刚开始用了布尔变量去判断闪光灯，结果闪光灯只能闪一下就灭掉了，如何单击按钮时让闪光灯常亮

*****************************

ZBarReaderView *readerView;

- (void)changeLight:(id)sender{

    UIButton *btn = (UIButton *)sender;

    if (btn.selected) {

          //判断按钮是否被点击

        btn.selected = NO;

        readerView.torchMode = 0;

    }else{

        btn.selected = YES;

        readerView.torchMode = 1;

    }

}