給UIView圓角 - Giving UIView rounded corners

問題：

My login view has a subview which has a UIActivityView and a UILabel saying "Signing In…". 個人登陸視圖有一個子視圖，它有一個UIActivityView和一個UILabel寫着「Signing In ...」。 This subview has corners which aren't rounded. 此子視圖的拐角不是圓角。 How can I make them round? 我怎樣才能讓它們成圓形？

Is there any way to do it inside my xib? 有沒有辦法在個人xib中作到這一點？

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解決方案：

參考一： https://stackoom.com/question/6KhX/給UIView圓角
參考二： https://oldbug.net/q/6KhX/Giving-UIView-rounded-corners