调整UIWebView文本的大小

问题描述：

我试图让用户调整给定网页的文字大小。我在Xcode 6中使用Swift。
HTML文件：

I am trying to let the user resize the text of the given web page. I am using Swift in Xcode 6. HTML file:

<!DOCTYPE html>
    <html>
    <body>

        <h1>My First Heading</h1>

        My first paragraph.

    </body>
</html>

这里是我打电话试图改变大小的swift函数：

and here is the swift function I am calling to try to change the size:

func changeWebViewFontSize(decOrInc: Int, webView: UIWebView)
{
//1 = decreace
//2 = increace
var textFontSizeTemp = defaults.objectForKey("textFontSize") as Int

switch decOrInc
{
case 1: //when decrease
    defaults.setObject(textFontSizeTemp - 1, forKey: "textFontSize")
case 2: //when increase
    defaults.setObject(textFontSizeTemp + 50, forKey: "textFontSize")
default:
    break
}

var jsString = "document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust=\(textFontSize)"
//var jsString = "alert('test')"
webView.stringByEvaluatingJavaScriptFromString(jsString)
}

我知道JavaScript正在运行，因为当我在javascript中运行alert（）函数时，它工作正常。请帮我看看我的代码有什么问题！

I know that the javascript is being run because when I ran an alert() function in the javascript, it worked. Please help me find out what is wrong with my code!

答

我写了一个像这样的例子，点击一个按钮的大小）：

I wrote an example like this which does the font resizing (increasing the size on tapping a button):

class webViewController: UIViewController {

@IBOutlet weak var webView: UIWebView!

@IBOutlet weak var increase: UIButton!

var defaults  = ["textFontSize":12]

@IBAction func btnIncreaseTapped(sender: AnyObject) {
    changeWebViewFontSize(2,webView: webView)
}

override func viewDidLoad() {
    super.viewDidLoad()

    let url = NSURL(string: "http://*.com/questions/28245483/resizing-uiwebview-text/28245982?noredirect=1#comment44873831_28245982")


    let urlRequest = NSURLRequest(URL: url!)

    webView.loadRequest(urlRequest)        

}

func changeWebViewFontSize(decOrInc: Int, webView: UIWebView)
{
    //1 = decreace
    //2 = increace
    var textFontSizeTemp = defaults["textFontSize"]! as Int


    switch decOrInc
    {
    case 1: //when decrease
        textFontSizeTemp  = textFontSizeTemp - 1
    case 2: //when increase
        textFontSizeTemp = textFontSizeTemp + 50
    default:
        break
    }

    defaults["textFontSize"] = textFontSizeTemp


    var jsString = "document.getElementsByTagName('body')[0].style.fontSize='\(textFontSizeTemp)px'"
    webView.stringByEvaluatingJavaScriptFromString(jsString)
    }
}

调整UIWebView文本的大小

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