Question

我想根据HTML内容设置UIWebview的高度。我得到一个字符串的大小，但由于段落，粗体，不同的字体大小等而没有得到实际大小。

Answer 1

我通常使用这些方法来设置UIWebview框架的内容大小：

- (void)webViewDidStartLoad:(UIWebView *)webView {
    CGRect frame = webView.frame;
    frame.size.height = 5.0f;
    webView.frame = frame;
}

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    CGSize mWebViewTextSize = [webView sizeThatFits:CGSizeMake(1.0f, 1.0f)]; // Pass about any size
    CGRect mWebViewFrame = webView.frame;
    mWebViewFrame.size.height = mWebViewTextSize.height;
    webView.frame = mWebViewFrame;

    //Disable bouncing in webview
    for (id subview in webView.subviews) {
        if ([[subview class] isSubclassOfClass: [UIScrollView class]]) {
            [subview setBounces:NO];
        }
    }
}

当webView已完成加载内容时，会自动调用它们（如果您将WebView的委托设置为此类）。

Answer 2

好吧，每个Web视图都内置了一个UIScrollView，所以我会尝试等待页面加载，然后点击滚动视图的contentSize属性来获取页面的高度。

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    CGFloat height = webView.scrollView.contentSize.height;
}

Answer 3

试试此代码

- (void)webViewDidFinishLoad:(UIWebView *)webView
{     
    height= [[self.webView stringByEvaluatingJavaScriptFromString:@"document.body.scrollHeight"] floatValue];
}

Answer 4

- (void)viewDidLoad
{
    [super viewDidLoad];
    webview.delegate = self;
    [webview loadHTMLString:@"<div id='foo' style='background: red'>The quick brown fox jumped over the lazy dog.</div>" baseURL:nil];
}

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    NSString *output = [webview stringByEvaluatingJavaScriptFromString:@"document.getElementById(\"foo\").offsetHeight;"];
    NSLog(@"height: %@", output);
}

另见How to determine UIWebView height based on content, within a variable height UITableView?

Calculate UIWebView height depending on its content

Answer 5

如果你在tableviewcell中有webview，则在heightForRowAtIndexPath中将单元格的高度设置为NSAttributedString大小的高度，如下所示。

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{


    NSAttributedString *attributedText = [NSString  getHTMLAttributedString:@"HTML Content"];
    CGSize size = CGSizeMake(300, CGFLOAT_MAX);
    CGRect paragraphRect =     [attributedText boundingRectWithSize:size
                                 options:(NSStringDrawingUsesLineFragmentOrigin)
                                 context:nil];
    return paragraphRect.size.height;
}

+(NSAttributedString *) getHTMLAttributedString:(NSString *) string{
    NSError *errorFees=nil;
    NSString *sourceFees = [NSString stringWithFormat:
                            @"<span style=\"font-family: 'Roboto-Light';font-size: 14px\">%@</span>",string];
    NSMutableAttributedString* strFees = [[NSMutableAttributedString alloc] initWithData:[sourceFees dataUsingEncoding:NSUTF8StringEncoding]
                                                                                 options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
                                                                                           NSCharacterEncodingDocumentAttribute: [NSNumber numberWithInt:NSUTF8StringEncoding]}
                                                                      documentAttributes:nil error:&errorFees];
    return strFees;

}

如何根据html内容设置UIWebView的高度？

5 个答案: