CODEWITHSUNDEEP
iosswiftuiwebview
Tom Harrington
Tom Harrington

Reputation: 70946

UIWebView stays blank when loading an HTML string

I have a UIWebView in my app and I'm attempting to use loadHTMLString(_:, baseURL:) to load HTML that's stored in a String in the app. The web view always shows up as a plain gray rectangle with no content. If I save the HTML string to a file and load it in Safari on my Mac, the page renders as expected.

I thought maybe it was something about the HTML so I've reduced it to a minimal test that gets the same results:

let myHTMLString = "<html><head></head><body><p>This is a test</p></body></html>"
myWebView.loadHTMLString(myHTMLString, baseURL: nil)

Still a gray rectangle.

I've browsed other answers here to check and verify various possibly-relevant details:

What have I missed? This should be a trivial case but I get no visible content.

Upvotes: 2

Views: 1830

Answers (3)

Tom Harrington
Tom Harrington

Reputation: 70946

After investigating and trying a new project (inspired by @DonMag's answer), it looks like the problem is that the UIWebView was contained in a UIStackView. Although the web view's dimensions were correct, this somehow prevented it from rendering content. I've tried this in a simple test project and the behavior carries over-- a plain UIWebView on its own works fine, but one contained in a stack view doesn't render its content, even if its size is correct.

I don't know why that is or whether there's a trick I could use to get a web view to work correctly within a stack view. But the cause is clear, if not the reason.

Upvotes: 1

DonMag
DonMag

Reputation: 77462

Try a fresh, empty UIViewController, with only this as the code:

import UIKit

class TestViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let newWebView = UIWebView(frame: CGRect(x: 8, y: 8, width: 300, height: 400))
        self.view.addSubview(newWebView)

        // cyan background html
        let myHTMLString = "<html><head></head><body bgcolor=#00ffff><p>This is a test</p></body></html>"
        newWebView.loadHTMLString(myHTMLString, baseURL: nil)
    }

}

Upvotes: 1

Renan Camaforte
Renan Camaforte

Reputation: 268

It's quite odd the error you're getting, but have you already tried to set a value for baseURLparameter? Something like: URL(string: "www.google.com")

Upvotes: 1

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