How to determine the content size of a UIWebView?

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灰色年华 2020-11-22 17:06

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. T

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一整个雨季 (楼主)

2020-11-22 17:46

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:@"", [[LocalizationStore instance] currentTextDir], [[LocalizationStore instance] currentLang]];
[htmlContent appendFormat:@""];
[htmlContent appendString:@""];
[htmlContent appendFormat:@"..."]; // Rest of your HTML -section
[htmlContent appendFormat:@""];
[htmlContent appendFormat:@""];
[htmlContent appendFormat:@""]; // !important https://stackoverflow.com/a/8031442/1046909
[htmlContent appendFormat:@"..."]; // Your HTML-content
[htmlContent appendFormat:@"
"]; //


[htmlContent appendFormat:@""];
[htmlContent appendFormat:@""];

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 > 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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