ios - UIWebView和WKWebView两个获取title的方式

UIWebView获取title的方式

在代理webViewDidFinishLoad方法中
-(void) webViewDidFinishLoad:(UIWebView *)webView {  
    [UIApplicationsharedApplication].networkActivityIndicatorVisible =NO;  
    self.title ＝  [webView stringByEvaluatingJavaScriptFromString:@"document.title"];//获取当前页面的title  
}

WKWebView获取title的方式比较复杂点

• 1.wkWebView初始化完毕笔后设置代理并添加观察者

例如：
_wkWebView.UIDelegate = self;
[_wkWebView addObserver:self forKeyPath:@"title" options:NSKeyValueObservingOptionNew context:NULL];

• 2.实现代理

//WkWebView的 回调
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
 if ([keyPath isEqualToString:@"title"]) {
        if (object == self.wkWebView) {
        self.title = self.wkWebView.title;
         } else {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
         }
    } else {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    
    }
    
}

• 3.移除代理

- (void)dealloc{
    [_wkWebView removeObserver:self forKeyPath:@"title"];
}