Has macOS, have system-wide. (Win is not it, I just have Win, has a system-wide) has macOS here refer to what can only be issued for all systems. So, what language can agree with it? You will say: "! Electron" right, iOS and Android to "kill you" again! ! ! So, in the end what is it? Is C #! Old program ape: "No, ah, ah only Win" No, Xamarin can solve all the problems. Windows-C # way
macOS- ordinary road
macOS-C # way
macOS-Electron way
So, we have macOS, the development of the whole system. However, only Xamarin-C # can develop all the system, however rare, is standard language macOS swiftand Objective-Ctwo kinds, so, C # how to get it? However, you first install Xcode, no Xcode, except Electron and NW, who also do not want to live! I have here is VMware Hackintosh macOS Catalina Beta 10.15.4 (latest version), if you can Baidu search. Make good use of search engines Without further ado, Syria, the book The IDE. Install Xcode. Do not use Beta , you want to install the Application folder ! 
To use here is good, App Store best, most genuine! Here, Download VSForMac point I downloaded (to knock a code and wait for the installer pre-register (seriously) say.) 
My macOS a little unusual, so so.
If Xcode installed, to start a complete basic configuration! ! !
After clicking, the following things dance is over, let you look at Bill, the selected content. 
Development macOS looked at, I have installed, so the two Gogo is mandatory, you have to like me, end mobile casual, interested can try. Click on the installation, complete the following chart. 
If you do not have Xcode installed, it will prompt you! Your Microsoft account to sign in and then select the keyboard layout (here, I'm old Windows driver, so I opened Windows, you open with you!) Let's get on it ~ ~ 
new projects, configuration, as you will. Point me to see how to create Hello_macOS Microsoft documentation. I will highlight some of publication. Published as a .dmg is very simple, released as a .pkg will use Packager.