How to determine the content size of a UIWebView

Question

I have a UIWebView with different  single page  content  I d like to find out the CGSize of the content to resize my parent views appropriately  The obvious -sizeThatFits  unfortunately just returns the current frame size of the webView

User · Answer

Xcode8 swift3 1    Set webView height to 0 first   In webViewDidFinishLoad Delegate    let height   webView scrollView contentSize height   Without step1  if webview height    actual contentHeight  step 2 will return webview height but not contentsize height

User · Answer

When using webview as a subview somewhere in scrollview  you can set height constraint to some constant value and later make outlet from it and use it like   -  void webViewDidFinishLoad  UIWebView   webView       webView scrollView scrollEnabled   NO       webViewHeight constant   webView scrollView contentSize height

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AFAIK you can use  webView sizeThatFits CGSizeZero  to figure out it s content size

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I m using a UIWebView that isn t a subview  and thus isn t part of the window hierarchy  to determine the sizes of HTML content for UITableViewCells  I found that the disconnected UIWebView doesn t report its size properly with - UIWebView sizeThatFits    Additionally  as mentioned in https   stackoverflow com a 3937599 9636  you must set the UIWebView s frame height to 1 in order to get the proper height at all   If the UIWebView s height is too big  i e  you have it set to 1000  but the HTML content size is only 500    UIWebView scrollView contentSize height - UIWebView stringByEvaluatingJavaScriptFromString   document height   - UIWebView sizeThatFits     All return a height of 1000   To solve my problem in this case  I used https   stackoverflow com a 11770883 9636  which I dutifully voted up  However  I only use this solution when my UIWebView frame width is the same as the - UIWebView sizeThatFits   width

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None of the suggestions here helped me with my situation  but I read something that did give me an answer  I have a ViewController with a fixed set of UI controls followed by a UIWebView  I wanted the entire page to scroll as though the UI controls were connected to the HTML content  so I disable scrolling on the UIWebView and must then set the content size of a parent scroll view correctly   The important tip turned out to be that UIWebView does not report its size correctly until rendered to the screen  So when I load the content I set the content size to the available screen height  Then  in viewDidAppear I update the scrollview s content size to the correct value  This worked for me because I am calling loadHTMLString on local content  If you are using loadRequest you may need to update the contentSize in webViewDidFinishLoad also  depending on how quickly the html is retrieved    There is no flickering  because only the invisible part of the scroll view is changed

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Resurrecting this question because I found Ortwin s answer to only work MOST of the time     The webViewDidFinishLoad method may be called more than once  and the first value returned by sizeThatFits is only some portion of what the final size should be   Then for whatever reason the next call to sizeThatFits when webViewDidFinishLoad fires again will incorrectly return the same value it did before   This will happen randomly for the same content as if it s some kind of concurrency problem   Maybe this behaviour has changed over time  because I m building for iOS 5 and have also found that sizeToFit works in much the same way  although previously this didn t    I have settled on this simple solution   -  void webViewDidFinishLoad  UIWebView   aWebView               CGFloat height     aWebView stringByEvaluatingJavaScriptFromString   document height   floatValue       CGFloat width     aWebView stringByEvaluatingJavaScriptFromString   document width   floatValue       CGRect frame   aWebView frame      frame size height   height      frame size width   width      aWebView frame   frame      Swift  2 2    func webViewDidFinishLoad webView  UIWebView         if let heightString   webView stringByEvaluatingJavaScriptFromString  document height            widthString   webView stringByEvaluatingJavaScriptFromString  document width            height   Float heightString           width   Float widthString             var rect   webView frame         rect size height   CGFloat height          rect size width   CGFloat width          webView frame   rect           Update  I have found as mentioned in the comments this doesn t seem to catch the case where the content has shrunk  Not sure if it s true for all content and OS version  give it a try

User · Answer

A simple solution would be to just use webView scrollView contentSize but I don t know if this works with JavaScript  If there is no JavaScript used this works for sure   -  void webViewDidFinishLoad  UIWebView   aWebView       CGSize contentSize   aWebView scrollView contentSize      NSLog   webView contentSize       NSStringFromCGSize contentSize

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For iOS10  I was getting 0  zero  value of document height so document body scrollHeight is the solution to get height of document in Webview  The issue can be resolved also for width

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Also in iOS 7 for proper working of all of mentioned methods add this in your view controller viewDidLoad method   if   self respondsToSelector  selector automaticallyAdjustsScrollViewInsets          self automaticallyAdjustsScrollViewInsets   NO      Otherwise neither of methods would work as it should

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This s weird   I tested the solutions both sizeThatFits  and  webView stringByEvaluatingJavaScriptFromString   document body scrollHeight   are NOT working for me   However  I found an interesting easy way to get the right height of webpage content  Currently  I used it in my delegate method scrollViewDidScroll    CGFloat contentHeight   scrollView contentSize height - CGRectGetHeight scrollView frame     Verified in iOS 9 3 Simulator Device  good luck   EDIT   Background  The html content is calculated by my string variable and HTTP content template  loaded by method loadHTMLString baseURL   no registered JS scripts there

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It turned out that my first guess using -sizeThatFits  was not completely wrong  It seems to work  but only if the frame of the webView is set to a minimal size prior to sending -sizeThatFits   After that we can correct the wrong frame size by the fitting size  This sounds terrible but it s actually not that bad  Since we do both frame changes right after each other  the view isn t updated and doesn t flicker   Of course  we have to wait until the content has been loaded  so we put the code into the -webViewDidFinishLoad  delegate method   Obj-C  -  void webViewDidFinishLoad  UIWebView   aWebView       CGRect frame   aWebView frame      frame size height   1      aWebView frame   frame      CGSize fittingSize    aWebView sizeThatFits CGSizeZero       frame size   fittingSize      aWebView frame   frame       NSLog   size   f   f   fittingSize width  fittingSize height       Swift 4 x  func webViewDidFinishLoad   webView  UIWebView        var frame   webView frame     frame size height   1     webView frame   frame     let fittingSize   webView sizeThatFits CGSize init width  0  height  0       frame size   fittingSize     webView frame   frame     I should point out there s another approach  thanks  GregInYEG  using JavaScript  Not sure which solution performs better   Of two hacky solutions I like this one better

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In Xcode 8 and iOS 10 to determine the height of a web view  you can get height using  -  void webViewDidFinishLoad  UIWebView   webView       CGFloat height     webView stringByEvaluatingJavaScriptFromString   document body scrollHeight   floatValue       NSLog   Webview height is    f   height       OR for Swift   func webViewDidFinishLoad aWebView UIWebView           let height  Float    aWebView stringByEvaluatingJavaScriptFromString  document body scrollHeight    toFloat             print  Webview height is    height

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I have another solution that works great   On one hand  Ortwin s approach  amp  solution works only with iOS 6 0 and later  but fails to work correctly on iOS 5 0  5 1 and 5 1 1  and on the other hand there is something that I don t like and can t understand with Ortwin s approach  it s the use of the method  webView sizeThatFits CGSizeZero  with the parameter CGSizeZero   If you read Apple Official documentation about this methods and its parameter  it says clearly        The default implementation of this method returns the size portion of the view   s bounds rectangle  Subclasses can override this method to return a custom value based on the desired layout of any subviews  For example  a UISwitch object returns a fixed size value that represents the standard size of a switch view  and a UIImageView object returns the size of the image it is currently displaying    What I mean is that it s like he came across his solution without any logic  because reading the documentation  the parameter passed to  webView sizeThatFits       should at least have the desired width  With his solution  the desired width is set to the webView s frame before calling sizeThatFits with a CGSizeZero parameter  So I maintain this solution is working on iOS 6 by  chance    I imagined a more rational approach  which has the advantage of working for iOS 5 0 and later    And also in complex situations where more than one webView  With its property webView scrollView scrollEnabled   NO is embedded in a scrollView   Here is my code to force the Layout of the webView to the desired width and get the corresponding height set back to the webView itself   Obj-C  -  void webViewDidFinishLoad  UIWebView   aWebView          aWebView scrollView scrollEnabled   NO        Property available in iOS 5 0 and later      CGRect frame   aWebView frame       frame size width   200           Your desired width here      frame size height   1            Set the height to a small one       aWebView frame   frame           Set webView s Frame  forcing the Layout of its embedded scrollView with current Frame s constraints  Width set above        frame size height   aWebView scrollView contentSize height      Get the corresponding height from the webView s embedded scrollView       aWebView frame   frame           Set the scrollView contentHeight back to the frame itself      Swift 4 x  func webViewDidFinishLoad   aWebView  UIWebView         aWebView scrollView isScrollEnabled   false     var frame   aWebView frame      frame size width   200     frame size height   1      aWebView frame   frame     frame size height   aWebView scrollView contentSize height      aWebView frame   frame      Note that in my example  the webView was embedded in a custom scrollView having other webViews    All these webViews had their webView scrollView scrollEnabled   NO  and the last piece of code I had to add was the calculation of the height of the contentSize of my custom scrollView embedding these webViews  but it was as easy as summing my webView s frame size height computed with the trick described above

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If your HTML contains heavy HTML-contents like iframe s  i e  facebook-  twitter  instagram-embeds  the real solution is much more difficult  first wrap your HTML    htmlContent appendFormat    lt html gt      LocalizationStore instance  currentTextDir     LocalizationStore instance  currentLang     htmlContent appendFormat    lt head gt      htmlContent appendString    lt script type   text javascript   gt      htmlContent appendFormat       var lastHeight   0      htmlContent appendFormat       function updateHeight     var h   document getElementById  content   offsetHeight  if  lastHeight    h    lastHeight   h  window location href     x-update-webview-height        h         htmlContent appendFormat       window onload   function         htmlContent appendFormat           setTimeout updateHeight  1000       htmlContent appendFormat           setTimeout updateHeight  3000       htmlContent appendFormat           if  window intervalId    clearInterval window intervalId         htmlContent appendFormat           window intervalId   setInterval updateHeight  5000       htmlContent appendFormat           setTimeout function    clearInterval window intervalId   window intervalId   null     30000       htmlContent appendFormat              htmlContent appendFormat    lt  script gt      htmlContent appendFormat             Rest of your HTML  lt head gt -section  htmlContent appendFormat    lt  head gt      htmlContent appendFormat    lt body gt      htmlContent appendFormat    lt div id   content   gt         important https   stackoverflow com a 8031442 1046909  htmlContent appendFormat             Your HTML-content  htmlContent appendFormat    lt  div gt         lt  div id  content  gt   htmlContent appendFormat    lt  body gt      htmlContent appendFormat    lt  html gt       Then add handling x-update-webview-height-scheme into your shouldStartLoadWithRequest       if  navigationType    UIWebViewNavigationTypeLinkClicked    navigationType    UIWebViewNavigationTypeOther           Handling Custom URL Scheme     if    request URL  scheme  isEqualToString   x-update-webview-height              NSInteger currentWebViewHeight      request URL  host  intValue           if   lastWebViewHeight    currentWebViewHeight                 lastWebViewHeight   currentWebViewHeight     class property              realWebViewHeight   currentWebViewHeight     class property              self layoutSubviews                     return NO                  And finally add the following code inside your layoutSubviews               NSInteger webViewHeight   0       if   realWebViewHeight  gt  0            webViewHeight    realWebViewHeight           realWebViewHeight   0        else           webViewHeight     webView stringByEvaluatingJavaScriptFromString   document getElementById   content    offsetHeight    integerValue              upateWebViewHeightTheWayYorLike webViewHeight     Now your have real WebViewHeight so you can update your webview height you like            P S  You can implement time delaying  SetTimeout and setInterval  inside your ObjectiveC Swift-code - it s up to you   P S S  Important info about UIWebView and Facebook Embeds  Embedded Facebook post does not shows properly in UIWebView

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I m also stuck on this problem  then I realized that if I want to calculate the dynamic height of the webView  I need to tell the width of the webView first  so I add one line before js and it turns out I can get very accurate actual height   The code is simple like this   - void webViewDidFinishLoad  UIWebView   webView          tell the width first     webView width    UIScreen mainScreen  bounds size width         use js to get height dynamically     CGFloat scrollSizeHeight     webView stringByEvaluatingJavaScriptFromString   document body scrollHeight   floatValue       webView height   scrollSizeHeight       webView x   0      webView y   0

[ios] How to determine the content size of a UIWebView?

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