-iOS计算UIWebView的高度和iOS8之后的WKWebV

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:

1.第一种方法:

-(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;
}

2.第二种方法:

-(void) webViewDidFinishLoad:(UIWebView *)webView
{
    CGRect frame = webView.frame;
    CGSize size = [webView sizeThatFits:CGSizeZero];
    frame.size = size;
    webView.frame = frame;
}

3.第三种方法:

- (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;
        }];
}