WKWebView bottom constraint set but won't work

问题

I have set WKWebView bottom constraint to superview but it won't display till superview instead displays content till safe area.

Here is the problem image that displays the bottom part doesn't fill properly.

And here is the hierarchy of view and constraints image

And code to setup WebView constraints with container view

    let wv = WKWebView(frame: containerView.frame, configuration: wvConfig)
    webView = wv
    containerView.addSubview(wv)

    // setup constraints
    wv.translatesAutoresizingMaskIntoConstraints = false
    if #available(iOS 11.0, *) {
        wv.trailingAnchor.constraint(equalTo: containerView.trailingAnchor).isActive = true
        wv.leadingAnchor.constraint(equalTo: containerView.leadingAnchor).isActive = true
        wv.topAnchor.constraint(equalTo: containerView.topAnchor).isActive = true
        wv.bottomAnchor.constraint(equalTo: containerView.bottomAnchor).isActive = true
    } else {
        NSLayoutConstraint(item: wv, attribute: .top, relatedBy: .equal, toItem: containerView, attribute: .top, multiplier: 1.0, constant: 0).isActive = true
        NSLayoutConstraint(item: wv, attribute: .leading, relatedBy: .equal, toItem: containerView, attribute: .leading, multiplier: 1.0, constant: 0).isActive = true
        NSLayoutConstraint(item: wv, attribute: .trailing, relatedBy: .equal, toItem: containerView, attribute: .trailing, multiplier: 1.0, constant: 0).isActive = true
        NSLayoutConstraint(item: wv, attribute: .bottom, relatedBy: .equal, toItem: containerView, attribute: .bottom, multiplier: 1.0, constant: 0).isActive = true
    }

So, Can anyone rectify issue here?

Some certain URL's it works, but not for all. Why?

回答1:

The following subclassed WKWebView might solve your problem:

class FullScreenWKWebView: WKWebView {

    override var safeAreaInsets: UIEdgeInsets {
        if #available(iOS 11.0, *) {
            let insects = super.safeAreaInsets
            return UIEdgeInsets(top: insects.top, left: insects.left, bottom: 0, right: insects.right)
        } else {
            return .zero
        }

    }
    override var alignmentRectInsets: UIEdgeInsets{
        let insects = super.alignmentRectInsets
        return UIEdgeInsets(top: insects.top-20, left: insects.left, bottom: 0, right: insects.right)
    }
}

The above snipped taken from

Full Code:

import UIKit
import WebKit
class FullScreenWKWebView: WKWebView {

    override var safeAreaInsets: UIEdgeInsets {
        if #available(iOS 11.0, *) {
            let insects = super.safeAreaInsets
            return UIEdgeInsets(top: insects.top, left: insects.left, bottom: 0, right: insects.right)
        } else {
            return .zero
        }

    }
    override var alignmentRectInsets: UIEdgeInsets{
        let insects = super.alignmentRectInsets
        return UIEdgeInsets(top: insects.top-20, left: insects.left, bottom: 0, right: insects.right)
    }
}
class ViewController: UIViewController {

    let contaienrView: UIView = {
        let v = UIView()
        v.translatesAutoresizingMaskIntoConstraints = false
        return v
    }()

    let webView: FullScreenWKWebView = {
        let v = FullScreenWKWebView()
        v.translatesAutoresizingMaskIntoConstraints = false
        return v
    }()

    func setupViews(){
        view.addSubview(contaienrView)
        contaienrView.addSubview(webView)
        let constrains = [
            contaienrView.topAnchor.constraint(equalTo: view.topAnchor),
            contaienrView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            contaienrView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
            contaienrView.trailingAnchor.constraint(equalTo: view.trailingAnchor),

            webView.topAnchor.constraint(equalTo: contaienrView.topAnchor),
            webView.leadingAnchor.constraint(equalTo: contaienrView.leadingAnchor),
            webView.bottomAnchor.constraint(equalTo: contaienrView.bottomAnchor),
            webView.trailingAnchor.constraint(equalTo: contaienrView.trailingAnchor),
            ]
        NSLayoutConstraint.activate(constrains)
    }

    func loadRequest(){
        let url = URL(string: "https://afghan-gps.com/mobile")!
        let request = URLRequest(url: url)
        webView.load(request)
    }


    override func viewDidLoad() {
        super.viewDidLoad()
        setupViews()
        loadRequest()
    }
}

output: 1. iOS version > 10

iOS version <11

回答2:

I am trying to reproduce the same issue, used your approach but didn't get any issue regarding bottom space.

class TestWebViewController: UIViewController{

@IBOutlet weak var containerView: UIView!

var wkWebView : WKWebView?

override func viewDidLoad() {
    super.viewDidLoad()
    addWKWebView()

    wkWebView?.load(URLRequest(url: URL(string: "https://www.google.com")!))
    wkWebView?.allowsBackForwardNavigationGestures = true

    // Do any additional setup after loading the view.
}

func addWKWebView() {
    let wvConfig = WKWebViewConfiguration.init()
    let wv = WKWebView(frame: containerView.frame, configuration: wvConfig)
    wkWebView = wv
    containerView.addSubview(wv)
    // setup constraints
    wv.translatesAutoresizingMaskIntoConstraints = false
    if #available(iOS 11.0, *) {
        wv.trailingAnchor.constraint(equalTo: containerView.trailingAnchor).isActive = true
        wv.leadingAnchor.constraint(equalTo: containerView.leadingAnchor).isActive = true
        wv.topAnchor.constraint(equalTo: containerView.topAnchor).isActive = true
        wv.bottomAnchor.constraint(equalTo: containerView.bottomAnchor).isActive = true
    } else {
        NSLayoutConstraint(item: wv, attribute: .top, relatedBy: .equal, toItem: containerView, attribute: .top, multiplier: 1.0, constant: 0).isActive = true
        NSLayoutConstraint(item: wv, attribute: .leading, relatedBy: .equal, toItem: containerView, attribute: .leading, multiplier: 1.0, constant: 0).isActive = true
        NSLayoutConstraint(item: wv, attribute: .trailing, relatedBy: .equal, toItem: containerView, attribute: .trailing, multiplier: 1.0, constant: 0).isActive = true
        NSLayoutConstraint(item: wv, attribute: .bottom, relatedBy: .equal, toItem: containerView, attribute: .bottom, multiplier: 1.0, constant: 0).isActive = true
    }
}
}

Everything is working fine for me.

Output -

Please let me know if I'm missing something.

UPDATE -

Issue is with scrollView of WKWebview.

In safe area WKScrollView.adjustedContentInset is set to {0, 0, 34, 0}.

To avoid this use

wv.scrollView.contentInsetAdjustmentBehavior = .never

Final output -

回答3:

Replace containerview with view in bottom constraint because root is view.

 view.addSubview(wv)

  wv.translatesAutoresizingMaskIntoConstraints = false
    if #available(iOS 11.0, *) {
        wv.trailingAnchor.constraint(equalTo: containerView.trailingAnchor).isActive = true
        wv.leadingAnchor.constraint(equalTo: containerView.leadingAnchor).isActive = true
        wv.topAnchor.constraint(equalTo: containerView.topAnchor).isActive = true
        wv.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
    }
    NSLayoutConstraint(item: wv, attribute: .top, relatedBy: .equal, toItem: containerView, attribute: .top, multiplier: 1.0, constant: 0).isActive = true
            NSLayoutConstraint(item: wv, attribute: .leading, relatedBy: .equal, toItem: containerView, attribute: .leading, multiplier: 1.0, constant: 0).isActive = true
            NSLayoutConstraint(item: wv, attribute: .trailing, relatedBy: .equal, toItem: containerView, attribute: .trailing, multiplier: 1.0, constant: 0).isActive = true
            NSLayoutConstraint(item: wv, attribute: .bottom, relatedBy: .equal, toItem: view, attribute: .bottom, multiplier: 1.0, constant: 0).isActive = true

回答4:

your code looks fine, your problem might come from the containerView constraints.

If you are using storyboards, Xcode is probably setting constraints on safe area. In that case you should handle all the constraints programmatically.

回答5:

According to the given screenshot, bottom constraint is applied in to safe area.Add bottom constraint into SuperView.

来源：https://stackoverflow.com/questions/57623677/wkwebview-bottom-constraint-set-but-wont-work

标签

ios

swift

wkwebview