如何刪除inputView下的灰色圖層swift

Question

我試圖離開我的Inputview透明背景，但我只把它弄灰。

的代碼是：

let fakeField : UITextField = UITextField(frame: CGRect.zero) 
    //1 
    InputViewCollection = InputView(frame: CGRect(x: 0, y: 0, width: 0, height: 216)) //Intialize custom input view 
    InputViewCollection?.delegate = self //delegate 
    InputViewCollection?.dataSource = self //datasource 

    //2 
    InputViewCollection?.backgroundColor = UIColor.clear 
    self.fakeField.inputView = InputViewCollection //Assign input view 
    self.fakeField.keyboardAppearance = .default 
    self.view.addSubview(self.fakeField) 

我怎麼能離開一個inputview的透明背景？

由於

Answer 1

試圖像InputViewCollection?.alpha = 0.0