獲取WKWebView高度

目錄

• 通過代理執行JS方法獲取
• 通過KVO獲取

---

方法一：通過代理執行JS方法獲取

- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
    [webView evaluateJavaScript:@"document.body.scrollHeight"
              completionHandler:^(id _Nullable result,NSError *_Nullable error) {
        // 高度
        CGFloat scrollViewHeight = [result doubleValue];
    }];
}

方法二：通過KVO獲取

// 添加KVO監聽
[_webView.scrollView addObserver:self
                      forKeyPath:@"contentSize"
                         options:NSKeyValueObservingOptionNew
                         context:nil];

// 實現監聽方法
- (void)observeValueForKeyPath:(NSString *)keyPath
                      ofObject:(id)object
                        change:(NSDictionary<NSKeyValueChangeKey,id> *)change
                       context:(void *)context {
    UIScrollView *scrollView = object;
    NSLog(@"%@", @(scrollView.contentSize.height));
}

// 移除監聽
- (void)dealloc{
    [self.webView.scrollView removeObserver:self
                                 forKeyPath:@"contentSize"];
}