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In IB's library, the introduction tells us that when the return key is pressed, the keyboard for UITextView will disappear.在IB的庫中，介紹告訴我們，當按下回車鍵時， UITextView的鍵盤就會消失。 But actually the return key can only act as '\\n'.但實際上返回鍵只能充當'\\n'。
I can add a button and use [txtView resignFirstResponder] to hide the keyboard.我可以添加一個按鈕並使用[txtView resignFirstResponder]來隱藏鍵盤。
But is there a way to add the action for the return key in keyboard so that I needn't add UIButton ?但是有沒有辦法在鍵盤中添加返回鍵的動作，這樣我就不需要添加UIButton ？
解決方案：
參考一： https://en.stackoom.com/question/2x4s參考二： https://stackoom.com/question/2x4s