按照苹果官方的开发手册一步一步来，添加了 Button, Text Field, Slider 这三个元素后（后面的action之类的还没做），我点击运行，如下图所示：右边红色框住的是运行效果，为什么三个元素一个都没看到？
谢谢！
PHP中文网2017-04-21 11:20:03
Are you sure this xib is associated with the main program?
I recommend a little thing I wrote before for your reference, a Music Player for Mac, which has no technical content and is also the first app to get started: https://github.com/isaced/MyMacMusicPlayer
