快速导入多个控制器，通过顶部选择菜单切换控制器，实现一个页面多个控制器切换处理.(It's an so easy way to add your all kinds of childControllers into superViewController, then you can slide around or just click on the topButton which is automatically building in the topView to switch your childViewController.）
chrome extension back top button
The sticky back-to-top button is a helpful navigation element that helps users get back to the top of the web page they’re viewing. A common UI pattern is to place this button in the lower right-hand corner of the screen, making it “sticky” via a fixed position so it’s always accessible as the user scrolls down the page.
Multi-screen landing page for a photographer
Add a description, image, and links to the topbutton topic page so that developers can more easily learn about it.
To associate your repository with the topbutton topic, visit your repo's landing page and select "manage topics."