Zbar SDK

ZBar SDK有两种使用方式：

1）直接调用 ZBarReaderViewController 打开一个扫描界面；

2）ZBar SDK提供的可以嵌入其他视图的ZBarReaderView（建议使用该方式，高度可自定义界面）；

协议ZBarReaderViewDelegate

实现delegate  方法

-(void)readerView:(ZBarReaderView *)readerView didReadSymbols:(ZBarSymbolSet *)symbols fromImage:(UIImage *)image{
    const zbar_symbol_t *symbol = zbar_symbol_set_first_symbol(symbols.zbarSymbolSet);
    NSString *symbolStr = [NSString stringWithUTF8String: zbar_symbol_get_data(symbol)];
    NSLog(@"code : %@", symbolStr);
    if (zbar_symbol_get_type(symbol) == ZBAR_QRCODE) {
       //这里写获取qrcode数据后操作
       /* _imageView.image=image;
        _imageView.contentMode=UIViewContentModeScaleAspectFit;
        _lable.text=symbolStr;
        [self.codeReaderView stop];
        [self.codeReaderView removeFromSuperview];*/
    }
}
设置 
self.codeReaderView = [[ZBarReaderView alloc] init];
    self.codeReaderView.frame = CGRectMake(0, 0, frameWidth, frameHeight);
    self.codeReaderView.readerDelegate = self;
    self.codeReaderView.allowsPinchZoom = NO;
    self.codeReaderView.torchMode = 0;
    self.codeReaderView.tracksSymbols = NO;
[self.codeReaderView start];
    [self.view addSubview: self.codeReaderView];