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XWVUserScript.swift
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69 lines (58 loc) · 2.13 KB
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/*
Copyright 2015 XWebView
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import Foundation
import WebKit
class XWVUserScript {
weak var webView: WKWebView?
let script: WKUserScript
let cleanup: String?
init(webView: WKWebView, script: WKUserScript, cleanup: String? = nil) {
self.webView = webView
self.script = script
self.cleanup = cleanup
inject()
}
convenience init(webView: WKWebView, script: WKUserScript, namespace: String) {
self.init(webView: webView, script: script, cleanup: "delete \(namespace)")
}
deinit {
eject()
}
private func inject() {
guard let webView = webView else { return }
// add to userContentController
webView.configuration.userContentController.addUserScript(script)
// inject into current context
if webView.URL != nil {
webView.evaluateJavaScript(script.source) {
if let error = $1 {
print("<XWV> ERROR: Inject user script in context.\n\(error)")
}
}
}
}
private func eject() {
guard let webView = webView else { return }
// remove from userContentController
let controller = webView.configuration.userContentController
let userScripts = controller.userScripts
controller.removeAllUserScripts()
userScripts.forEach {
if $0 != self.script { controller.addUserScript($0) }
}
if webView.URL != nil, let cleanup = cleanup {
// clean up in current context
webView.evaluateJavaScript(cleanup, completionHandler: nil)
}
}
}