Resizing text in UIWebView - Swift 3

问题

I having a problem, resizing text within a UIWebView, the html file is located within the bundle. I have managed to get a modified script to work within obj-c, however using swift 3 there is no change to the text size, although the optimal value changes correctly at each click of the button. Here is the code -

import UIKit

class ViewController: UIViewController {

@IBOutlet var resWebView: UIWebView!

@IBOutlet weak var increaseFont: UIBarButtonItem!

@IBOutlet weak var decreaseFont: UIBarButtonItem!


var defaults  = ["textFontSize":40]


@IBAction func fontButtonPressed(sender: UIBarButtonItem) {

    var textFontSize = defaults["textFontSize"]

    switch sender.tag
    {
    case 1 : //when decrease
        textFontSize  = textFontSize! - 10

    case 2 ://when increase
        textFontSize = textFontSize! + 50
    default:
        break
    }

    defaults["textFontSize"] = textFontSize

    print(textFontSize)

    var jsString = "document.getElementsByTagName('body')[0].style.fontSize='\(defaults["textFontSize"])px'"
    resWebView.stringByEvaluatingJavaScript(from: jsString)
}


override func viewDidLoad() {
    super.viewDidLoad()

    let resFilePath = Bundle.main.url(forResource: "ResilienceHandbook", withExtension: "html");

    let resRequest = URLRequest(url: resFilePath!);
    resWebView.loadRequest(resRequest);


    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

Any pointers gratefully received - Thank you

回答1:

As this is a web view, you can wrap content with "font size" attribute,

        let content = "<html><body><p><font size=30>" + webContent + "</font></p></body></html>"
        webView.loadHTMLString(content, baseURL: nil)

Here change the size accordingly

回答2:

This question is answered here:

Resizing UIWebView text

However I converted it in to Swift3 and tested it on Xcode8. Here is the code:

class ViewController: UIViewController {

@IBOutlet weak var webView: UIWebView!

var defaults  = ["textFontSize":12]

override func viewDidLoad() {
    super.viewDidLoad()

    let url = NSURL(string: "https://stackoverflow.com/questions/39638019/resizing-text-in-uiwebview-swift-3")


    let urlRequest = NSURLRequest(url: url! as URL)

    webView.loadRequest(urlRequest as URLRequest)

}

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


    switch zoomInOrZoomOut
    {
    case 1: //when decrease
        textFontSizeTemp  = textFontSizeTemp - 20
    case 2: //when increase
        textFontSizeTemp = textFontSizeTemp + 20
    default:
        break
    }

    defaults["textFontSize"] = textFontSizeTemp


    let jsString = "document.getElementsByTagName('body')[0].style.fontSize='\(textFontSizeTemp)px'"
    webView.stringByEvaluatingJavaScript(from: jsString)
}

//UIButton Action
@IBAction func zoomOutButton_TouchUpInside(_ sender: AnyObject)
{
    changeWebViewFontSize(zoomInOrZoomOut: 1,webView: webView)
}

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

来源：https://stackoverflow.com/questions/39638019/resizing-text-in-uiwebview-swift-3

标签

ios

uiwebview

swift3