Removing WKWebView Accesory bar in Swift

Question

I am trying for a few days now to get this converted into Swift without really having much background with it.

This is what I've got so far ... and I have been looking on google not really knowing what to search for in order to be more specific. Can you please shed some light on what I'm doing wrong ? Thanks

Update:

I have aded the objective-c tag just so more people that are related to this thread may be able to see it and hopefully get an answer.

Answer 1

For those who are still looking, the WebKit team updated WKWebView (iOS 13+) so that you can subclass it to remove/update the input accessory view:

https://trac.webkit.org/changeset/246229/webkit#file1

In Swift, I subclassed it, and returned nil. Worked as expected. I hope it helps.

FYI: I checked the docs, and it doesn't mention not to subclass WKWebView, so subclassing is allowed.

import WebKit

class RichEditorWebView: WKWebView {

    var accessoryView: UIView?

    override var inputAccessoryView: UIView? {
        // remove/replace the default accessory view
        return accessoryView
    }

}

You can find a working version of it here: https://github.com/cbess/RichEditorView/commits/master

Answer 2

Michael Dautermann answer has got everything right, but in order to hide the accessory bar you need to swizzle the method inputAccessoryView() of UIView Class with the inputAccessoryView() of the _NoInputAccessoryView class. I have just added the couple of extra lines to the code which does this job of method swizzling.

First you'll need a fake class to swap with

final class FauxBarHelper: NSObject {
    var inputAccessoryView: AnyObject? { return nil }
}

Then create this method in your controller class

/// Removes the keyboard accessory view from the web view
/// Source: http://stackoverflow.com/a/32620344/308315 / http://stackoverflow.com/a/33939584/308315
func _removeInputAccessoryView(webView: UIWebView) {
    var targetView: UIView? = nil

    for view in webView.scrollView.subviews {
        if String(describing: type(of: view)).hasPrefix("WKContent") {
            targetView = view
        }
    }

    guard let target = targetView else { return }

    let noInputAccessoryViewClassName = "\(target.superclass!)_NoInputAccessoryView"
    var newClass: AnyClass? = NSClassFromString(noInputAccessoryViewClassName)
    if newClass == nil {
        let targetClass: AnyClass = object_getClass(target)
        newClass = objc_allocateClassPair(targetClass, noInputAccessoryViewClassName.cString(using: String.Encoding.ascii)!, 0)
    }

    let originalMethod = class_getInstanceMethod(FauxBarHelper.self, #selector(getter: FauxBarHelper.inputAccessoryView))
    class_addMethod(newClass!.self, #selector(getter: FauxBarHelper.inputAccessoryView), method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod))
    object_setClass(target, newClass)
}

HTH ;)

Answer 3

Here's a slightly safer (no unsafe unwraps) version that works with Swift 4 and (at least) iOS 9 trough 12.

fileprivate final class InputAccessoryHackHelper: NSObject {
    @objc var inputAccessoryView: AnyObject? { return nil }
}

extension WKWebView {
    func hack_removeInputAccessory() {
        guard let target = scrollView.subviews.first(where: {
            String(describing: type(of: $0)).hasPrefix("WKContent")
        }), let superclass = target.superclass else {
            return
        }

        let noInputAccessoryViewClassName = "\(superclass)_NoInputAccessoryView"
        var newClass: AnyClass? = NSClassFromString(noInputAccessoryViewClassName)

        if newClass == nil, let targetClass = object_getClass(target), let classNameCString = noInputAccessoryViewClassName.cString(using: .ascii) {
            newClass = objc_allocateClassPair(targetClass, classNameCString, 0)

            if let newClass = newClass {
                objc_registerClassPair(newClass)
            }
        }

        guard let noInputAccessoryClass = newClass, let originalMethod = class_getInstanceMethod(InputAccessoryHackHelper.self, #selector(getter: InputAccessoryHackHelper.inputAccessoryView)) else {
            return
        }
        class_addMethod(noInputAccessoryClass.self, #selector(getter: InputAccessoryHackHelper.inputAccessoryView), method_getImplementation(originalMethod), method_getTypeEncoding(originalMethod))
        object_setClass(target, noInputAccessoryClass)
    }
}

Answer 4

This code snippet should get you over your issue:

class _NoInputAccessoryView: NSObject {

    func removeInputAccessoryViewFromWKWebView(webView: WKWebView) {
        // make sure to make UIView an optional here...
        var targetView: UIView? = nil
        for view in webView.scrollView.subviews {
            if String(view.dynamicType).hasPrefix("WKContent") {
                targetView = view
            }
        }

        // only optionals can be nil
        if targetView == nil {
            return
        }

        let noInputAccessoryViewClassName = "\(targetView!.superclass)_NoInputAccessoryView"
        var newClass : AnyObject? = NSClassFromString(noInputAccessoryViewClassName)
        if newClass == nil {
            let uiViewClass : AnyClass = object_getClass(targetView!)
            newClass = objc_allocateClassPair(uiViewClass, noInputAccessoryViewClassName.cStringUsingEncoding(NSASCIIStringEncoding)!, 0)
        }
    } 

You can also use "String(view.dynamicType)" to get the class name of the object you're looking at, as I noticed via this answer as I was researching the way to solve your problem.

Using hasPrefix like that in both Objective-C and Swift is really hacky and perhaps a better way of hiding the keyboard could be found for production code?