代码从2.0转换为1.0

Question

我正在开发XCode 6.4.1上的条形码扫描器 这是Swift 2.0代码：

do {
   videoInput = try AVCaptureDeviceInput(device: videoCaptureDevice)
} catch {
   return
}

你能否告诉我在swift 1.0中替换“do，try＆amp; catch”

Answer 1

if let videoInput = AVCaptureDeviceInput(device: videoCaptureDevice) {
  //videoInput available
} else {
  return 
}