如何修复“deviceInputWithDevice不可用”错误？

Question

我正在将我的应用从Swift升级到Swift 2并遇到以下错误： 'deviceInputWithDevice' is unavailable: use object construction 'AVCaptureDeviceInput(device:error:)'

以下是相关代码：

    let captureDevice = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)
    var input:AVCaptureDeviceInput
    let error:NSError?

    do {
        let input = try AVCaptureDeviceInput.deviceInputWithDevice(captureDevice) as AVCaptureDeviceInput
    } catch let error as NSError {
        print(error)
    }

有人可以帮我理解建议的解决方案：“使用对象构造'AVCaptureDeviceInput（device：error :)'”以及如何实现它？

Answer 1

myage = 20;
varobj = {tvar: "myage"};
syncvar(); 
alert(thevar); // 20
myage = 100;
syncvar();
alert(thevar); // 100