给UIView圆角 - Giving UIView rounded corners

问题：

My login view has a subview which has a UIActivityView and a UILabel saying "Signing In…". 个人登陆视图有一个子视图，它有一个UIActivityView和一个UILabel写着“Signing In ...”。 This subview has corners which aren't rounded. 此子视图的拐角不是圆角。 How can I make them round? 我怎样才能让它们成圆形？

Is there any way to do it inside my xib? 有没有办法在个人xib中作到这一点？

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解决方案：

参考一： https://stackoom.com/question/6KhX/给UIView圆角
参考二： https://oldbug.net/q/6KhX/Giving-UIView-rounded-corners