Watermark the application globally. If the user takes a screenshot in the application, all screenshots will have a watermark. It is commonly used in the internal application of enterprises, and there is a need for confidentiality.给应用全局加水印。用户如果在应用内截图，则所有截图都会有水印。一般应用于企业内部应用，有保密需要的场景。
公司要求APP所有界面都加水印，我自定义了一个watermark的视图，addsubview到keywindow下，再把watermark的userinteractionenabled设置成NO。这样需求大功告成！然而，后续用户反馈，水印挡住了某些点击事件（调用相册时，分享文件时），我用xcode的Debug view hierarchy查看，这些被挡住的界面都属于UITransitionView，就是系统的界面和keywindow的子视图会有莫名的BUG，真是让人头大。网上关于UITransitionView的资料很少，apple developer里甚至没有，愁死人啊。不知阁下有没有继续研究下去呢？
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
An Open Source Machine Learning Framework for Everyone
Django
The Web framework for perfectionists with deadlines.
Laravel
A PHP framework for web artisans
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
Some thing interesting about web. New door for the world.
A server is a program made to process requests and deliver data to clients.
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
Some thing interesting about visualization, use data art
Some thing interesting about game, make everyone happy.
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
Microsoft
Open source projects and samples from Microsoft.
Google
Google ❤️ Open Source for everyone.
Alibaba
Alibaba Open Source for everyone
D3
Data-Driven Documents codes.
Tencent
China tencent open source team.
