这是一个WKWebView的进度观察者
private lazy var progressObservation: NSKeyValueObservation = {
var observation = self.webView.observe(\.estimatedProgress, options: [.old, .new], changeHandler: { webView, change in
self.progressCount += 1
self.checkTimeout(self.progressCount, timeout: 10.0)
if webView.estimatedProgress > 0.1 {
self.progressView.setProgress(Float(webView.estimatedProgress), animated: true)
}
log.debug("网页\(self.urlString)加载进度为：\(self.webView.estimatedProgress),是否还在加载\(webView.isLoading)旧的进度为：\(change.oldValue ?? 0)新的进度为：\(change.newValue ?? 0)")
if webView.estimatedProgress >= 1 {
UIView.animate(withDuration: 0.3, delay: 0.1, options: .curveEaseOut, animations: {
}, completion: { (finish) in
self.resetProgress()
})
}
})
return observation
}()
private func checkTimeout(_ count: Int, timeout: CGFloat) {
Timer.after(10.second) {
if count == self.progressCount {
self.resetProgress()
log.debug("\(timeout)秒进度没有动了，已经超时了，自动隐藏进度条")
return
}
}
}
private func resetProgress() {
self.progressView.isHidden = true
self.progressView.setProgress(0.1, animated: false)
self.progressCount = 0
}
这是WKWebView的标题观察者
private lazy var titleObservation: NSKeyValueObservation = {
var observation = self.webView.observe(\.title, options: [.old, .new], changeHandler: { [weak self] webView, change in
guard let `self` = self else { return }
self.title = self.webView.title!.count > 0 ? self.webView.title : self.titleString
})
return observation
}()
