UIWebView LoadData is not accepting Nil values for textEncodingName and baseURL

问题

Till Swift 1.2 version, UIWebView LoadData was accepting nil values, but Swift 2.0 is throwing error "Swift does not conform to protocol NilLateralConvertible".

Swift 1.2: Works fine

self.webView.loadData(tempData!, MIMEType: "application/pdf", textEncodingName: nil, baseURL: nil)

Swift 2.0: Throws error

self.webView.loadData(tempData!, MIMEType: "application/pdf", textEncodingName: nil, baseURL: nil)

回答1:

This works for me:

webView.loadData(pdfDownload, MIMEType: "application/pdf", textEncodingName: "", baseURL: NSURL())

回答2:

Swift 3:

self.webView.loadData(tempData!, MIMEType: "application/pdf", textEncodingName: "UTF-8", baseURL: NSURL() as URL)

回答3:

The default character encoding is UTF-8 so you can do in this way:

self.webView.loadData(tempData!, MIMEType: "application/pdf", textEncodingName: "UTF-8", baseURL: NSURL())

回答4:

Apple has updated the declarations and they now require non-nil values. They have adding reality to the declarations for the benefit of Swift (and ObjC).

- (void)loadData:(NSData   * nonnull)data
        MIMEType:(NSString * nonnull)MIMEType
textEncodingName:(NSString * nonnull)encodingName
         baseURL:(NSURL    * nonnull)baseURL

来源：https://stackoverflow.com/questions/32084420/uiwebview-loaddata-is-not-accepting-nil-values-for-textencodingname-and-baseurl