iOS计算UIWebView的高度和iOS8之后的WKWebView的高度问题

当我们涉及到webView和自定义控件结合的时候,例如一个资讯详情,上半部分是webView,下面位置想加上我们的自定义控件,可可以计算出webView的高度，在刷新界面.

下边是计算UIWebView的高度:

-(void)webViewDidFinishLoad:(UIWebView *)webView{

        // 计算UIWebView高度

        CGRect frame =webView.frame;

        frame.size.height = [[webView stringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"] floatValue];

        webView.frame = frame;

}

-(void) webViewDidFinishLoad:(UIWebView *)webView

{

    CGRect frame = webView.frame;

    CGSize size = [webView sizeThatFits:CGSizeZero];

    frame.size = size;

    webView.frame = frame;

}

- (void)viewDidLoad {

    [super viewDidLoad];

    webview.delegate = self;

    [webview loadHTMLString:@"<div id='foo' style='background: red'>fdasfda</div>" baseURL:nil];

}

- (void)webViewDidFinishLoad:(UIWebView *)webView

{

    NSString *output = [webview stringByEvaluatingJavaScriptFromString:@"document.getElementByIdx_x_x_x("foo").offsetHeight;"];

    NSLog(@"height: %@", output);

}

下边是计算WKWebView的高度:

- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecifiedWKNavigation *)navigation

{

        // 计算WKWebView高度

        [webView evaluateJavaScript:@"document.body.offsetHeight" completionHandler:^(id _Nullable result, NSError * _Nullable error) {

            CGRect frame =webView.frame;

            frame.size.height =[result doubleValue];

            webView.frame = frame;

        }];

}