macOS 自定义 NSButton

https://www.jianshu.com/p/bf24d0e43eda

https://www.jianshu.com/p/c09c715b1617

https://blog.csdn.net/KuangSimon/article/details/79970691

https://blog.csdn.net/lengshengren/article/details/53887873

https://www.jianshu.com/p/a3f16178a213

窗口弹出 http://www.cocoachina.com/bbs/read.php?tid=1679520

关闭窗口 https://blog.csdn.net/lovechris00/article/details/78143104

https://www.cnblogs.com/ben-gao/p/9306708.html

原文：https://www.cnblogs.com/pinweyshg/p/10736088.html