有时需要在扫描界面显示应用程序的导航条和工具栏，而不是全屏都是扫描界面，此时就需要自定义扫描界面。

这时，用ZBarReaderView比较方便，比ZBarReaderViewcontroller方便控制界面。

1.将扫描视图加到当前需要扫描的界面上

    ZBarReaderView *readerView = [[ZBarReaderView alloc]init];
    readerView.frame = CGRectMake(0, 44, self.view.frame.size.width, self.view.frame.size.height – 88);
    ScanRegionView *scanView = [[ScanRegionView alloc] initWithFrame:CGRectMake(0, 0, 320, readerView.frame.size.height)];
    scanView.backgroundColor = [UIColor clearColor];
    readerView.readerDelegate = self;
    [readerView addSubview:scanView];
    //关闭闪光灯
    readerView.torchMode = 0;
  
    [self.view addSubview:readerView];
    //扫描区域计算
    readerView.scanCrop = [self getScanCrop:scanMaskRect readerViewBounds:readerView.bounds];
    
    [readerView start];

2、实现委托ZBarReaderViewDelegate委托方法

ZBarReaderViewDelegate

-(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)];
    
    //判断是否包含 头\’http:\’
    NSString *regex = @”http+:[^\\s]*”;
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@”SELF MATCHES %@”,regex];
    
    //判断是否包含 头\’ssid:\’
    NSString *ssid = @”ssid+:[^\\s]*”;;
    NSPredicate *ssidPre = [NSPredicate predicateWithFormat:@”SELF MATCHES %@”,ssid];
    
    if ([predicate evaluateWithObject:symbolStr]) {

    }
    else if([ssidPre evaluateWithObject:symbolStr]){
        
        NSArray *arr = [symbolStr componentsSeparatedByString:@”;”];
        
        NSArray * arrInfoHead = [[arr objectAtIndex:0] componentsSeparatedByString:@”:”];
        
        NSArray * arrInfoFoot = [[arr objectAtIndex:1] componentsSeparatedByString:@”:”];
        
        
        symbolStr = [NSString stringWithFormat:@”ssid: %@ \n password:%@”,
                            [arrInfoHead objectAtIndex:1],[arrInfoFoot objectAtIndex:1]];
        
        UIPasteboard *pasteboard=[UIPasteboard generalPasteboard];
        //然后，可以使用如下代码来把一个字符串放置到剪贴板上：
        pasteboard.string = [arrInfoFoot objectAtIndex:1];
    }
}

这样就能按自己的想法来设置扫描界面了。我试过将中间一小块区域设置成扫描区域，周围全是半透明的背景层，相对于使用ZBarReaderViewcontroller，更容易实现。