WKWebView进度及title

WKWebView进度及title

WKWebView 的estimatedProgress和title 都是KVO模式，所以可以添加监控：

[webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:NULL];

[webView addObserver:self forKeyPath:@"title" options:NSKeyValueObservingOptionNew context:NULL];

监控的实现方法：

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {

if ([keyPath isEqualToString:@"estimatedProgress"]) {

if (object == webView) {

[self.progressView setAlpha:1.0f];

[self.progressView setProgress:self.currentSubView.webView.estimatedProgress animated:YES];

if(self.currentSubView.webView.estimatedProgress >= 1.0f) {

[UIView animateWithDuration:0.3 delay:0.3 options:UIViewAnimationOptionCurveEaseOut animations:^{

[self.progressView setAlpha:0.0f];

} completion:^(BOOL finished) {

[self.progressView setProgress:0.0f animated:NO];

}];

}

}

else

{

[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];

}

}

else if ([keyPath isEqualToString:@"title"])

{

if (object == self.webView) {

self.title = self.webView.title;

}

else

{

[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];

}

}

else {

[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];

}

}

这里的进度增加了动画，类似safari的进度效果

需要注意的是销毁的时候一定要移除监控

[webView removeObserver:self forKeyPath:@"estimatedProgress"];

[webView removeObserver:self forKeyPath:@"title"];

swift:

// 监听

theWebView?.addObserver(self, forKeyPath: "estimatedProgress", options: NSKeyValueObservingOptions.New, context: nil)

theWebView?.addObserver(self, forKeyPath: "title", options: NSKeyValueObservingOptions.New, context: nil)

override func observeValueForKeyPath(keyPath: String?, ofObject object: AnyObject?, change: [String : AnyObject]?, context: UnsafeMutablePointer<Void>) {

if keyPath == "estimatedProgress" {

if ((object?.isEqual(theWebView)) != false) {

self.progressView.alpha = 1.0

self.progressView.setProgress(Float((self.theWebView?.estimatedProgress)!), animated: true)

if self.theWebView?.estimatedProgress >= 1.0 {

UIView.animateWithDuration(0.3, delay: 0.3, options: .CurveEaseOut, animations: {

self.progressView.alpha = 0.0

}, completion: { (finished) in

self.progressView.setProgress(0.0, animated: false)

})

}

}else {

super.observeValueForKeyPath(keyPath, ofObject: object, change: change, context: context)

}

}

}

deinit {

webView.removeObserver(self, forKeyPath: "estimatedProgress")

webView.removeObserver(self, forKeyPath: "title")

}