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")
}
原文：http://www.cnblogs.com/YangFuShun/p/5718872.html