Use Swift3.0 to achieve similar to the bottom of the WeChat alert view

Name		Name	Last commit message	Last commit date
Latest commit History 14 Commits
LuBottomAlertView		LuBottomAlertView
Sources		Sources
.gitignore		.gitignore
LICENSE		LICENSE
LuBottomAlertView.podspec		LuBottomAlertView.podspec
README.md		README.md
底部弹框.gif		底部弹框.gif

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