uiwebview - How to calculate web view content height in iOS? -

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I need to resize the web view frame according to the height of the content. I need to calculate the height of the content. is.

This is the solution I use 

  NSUntiger contentHight = [[Webview StringBevilingJavascriptFormString: [NSSTING stringWaterFormat: @ "Document.com.Sworldite;"]] interview];   
 All possible content in your webview should be smaller than the size

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