Swift 4中的iOS UIKit：使用UIWebView打开PDF

预习

资源

项目

https://github.com/calmone/iOS-UIKit-component

参考

• UIWebView
  https://developer.apple.com/reference/uikit/uiwebview
• UIButton
  https://developer.apple.com/reference/uikit/uibutton
• UIActivityIndi​​catorView
  https://developer.apple.com/reference/uikit/uiactivityindicatorview
• 网址
  https://developer.apple.com/reference/foundation/nsurl
• NSURLRequest
  https://developer.apple.com/reference/foundation/nsurlrequest

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