[英]UIWebView change line spacing text
I'm looking for a javascript method or a way to change line spacing of text in a UIWebView. 我正在寻找一种javascript方法或一种在UIWebView中更改文本行间距的方法。
Any ideas? 有任何想法吗?
Edit: 编辑:
Evan has answered the above question, but I have another on the same topic. Evan已回答了上述问题,但我对同一主题提出了另一个问题。
How can I query the source for the current line spacing value? 如何查询当前行间距值的来源?
You will need to inject javascript into the UIWebView
's source by calling stringByEvaluatingJavaScriptFromString:
. 您需要通过调用
stringByEvaluatingJavaScriptFromString:
将javascript注入UIWebView
的源代码中。
Javascript: 使用Javascript:
var head = document.getElementsByTagName('head')[0],
style = document.createElement('style'),
rules = document.createTextNode('* { line-height: 20px !important; }');
style.type = 'text/css';
if(style.styleSheet)
style.styleSheet.cssText = rules.nodeValue;
else style.appendChild(rules);
head.appendChild(style);
Objective-C (probably in webViewDidFinishLoading:
): Objective-C(可能在
webViewDidFinishLoading:
:
NSString *js = /* The javascript above in a string */
[webView stringByEvaluatingJavaScriptFromString:js];
To retrieve the line-height
value of the first h1
element on the page: 要检索页面上第一个
h1
元素的line-height
值:
Javascript: 使用Javascript:
var element = document.getElementsByTagName('h1')[0],
style = window.getComputedStyle(element),
lh = style.getPropertyValue('line-height');
return lh;
Objective-C: Objective-C的:
NSString *js = /* The javascript above in a string */
NSString *lineHeight = [webView stringByEvaluatingJavaScriptFromString:js];
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