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如何根據html內容設置UIWebView的高度?

[英]How to set height of UIWebView based on html content?

我想根據HTML內容設置UIWebview的高度。 我得到一個字符串的大小,但由於段落,粗體,不同的字體大小等,沒有得到實際的大小。

我通常使用這些方法來設置UIWebview框架的內容大小:

- (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];
        }
    }
}

WebView完成加載內容時,會自動調用它們(如果將webView的委托設置為此類)。

好吧,每個Web視圖都內置了一個UIScrollView,所以我會嘗試等待頁面加載,然后點擊滾動視圖的contentSize屬性來獲取頁面的高度。

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

試試這個代碼

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

另請參閱如何根據內容在可變高度UITableView內確定UIWebView高度?

根據其內容計算UIWebView高度

如果在tableviewcell中有webview,則在heightForRowAtIndexPath中將單元格的高度設置為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;

}

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