ios - 条形码扫描器在 ios 中第一次使用时卡住，而在第二次单击时它工作正常

Question

您好，我正在使用 phonegap barcodeplugin wildabeast/BarcodeScanner 扫描条形码。

这是我的代码

$('#scanbtn').on( "tap", function(evt){

                    scanner = null;

                    if(ival == 0){
                        ival = 1;
                        scanaction();

                    }

            });

            function scanaction(){
                cordova.plugins.barcodeScanner.scan( function (result) {

                        scanText = result.text;
                        scanFormat = result.format;
                        scanCancelled = result.cancelled;

                    /* alert("We got a barcode\n" +
                                "Result: " + scanText + "\n" +
                                "Format: " + scanFormat + "\n" +
                                "Cancelled: " + scanCancelled); */

                                $.mobile.changePage('#pageTwo',{transition: "slide"});


                    }, function (error) {
                        ival = 0;
                        console.log("Scanning failed: ", error);

                    });
            }

这次我得到的日志是

    2014-05-23 10:41:26.629 ShareQ[283:60b] WARNING: -[<AVCaptureVideoPreviewLayer: 0x155ba090> isOrientationSupported] is deprecated.  Please use AVCaptureConnection's -isVideoOrientationSupported
    2014-05-23 10:41:26.735 ShareQ[283:60b] WARNING: -[<AVCaptureVideoPreviewLayer: 0x155ba090> setOrientation:] is deprecated.  Please use AVCaptureConnection's -setVideoOrientation:
    2014-05-23 10:41:27.300 ShareQ[283:60b] WARNING: -[<AVCaptureVideoPreviewLayer: 0x155ba090> setOrientation:] is deprecated.  Please use AVCaptureConnection's -setVideoOrientation:
    2014-05-23 10:41:27.310 ShareQ[283:60b] Warning: Attempt to present <CDVbcsViewController: 0x155392f0> on <MainViewController: 0x1559e3c0> while a presentation is in progress!
    2014-05-23 10:41:27.321 ShareQ[283:60b] Warning: Attempt to present <CDVbcsViewController: 0x1553bb20> on <MainViewController: 0x1559e3c0> while a presentation is in progress!
    2014-05-23 10:41:27.324 ShareQ[283:60b] Warning: Attempt to present <CDVbcsViewController: 0x1553d2b0> on <MainViewController: 0x1559e3c0> while a presentation is in progress!
    2014-05-23 10:41:27.326 ShareQ[283:60b] Warning: Attempt to present <CDVbcsViewController: 0x155418b0> on <MainViewController: 0x1559e3c0> while a presentation is in progress!
    2014-05-23 10:41:27.328 ShareQ[283:60b] Warning: Attempt to present <CDVbcsViewController: 0x155456f0> on <MainViewController: 0x1559e3c0> while a presentation is in progress!
    2014-05-23 10:41:27.331 ShareQ[283:60b] Warning: Attempt to present <CDVbcsViewController: 0x155fa710> on <MainViewController: 0x1559e3c0> while a presentation is in progress!

Answer 1

问题是由于jquerymobile框架。 jquerymobile 中的“tap”功能在单击时多次触发是我提到的问题的原因。通过如下更改 jquerymobile 的“tap”方法来纠正此问题

    $(document).off('tap', '#scanbtn')
                          .on('tap', '#scanbtn',function(e) {
                                   if(ival == 0){
                                          ival = 1;
                                          scanaction();

                                    }

                             });

现在我的问题已经解决了。扫描仪工作正常。