iOS increase UIWebView font size

Question

I looked for solution on Stack Overflow but I didn't find one. My code is:

CGRect  rect = _postContentView.bounds;
_postContentUIWV = [[UIWebView alloc] initWithFrame:rect];
[_postContentUIWV loadHTMLString:selectedPostCD.content baseURL:nil];

int fontSize = 30;
NSString *jsString = [[NSString alloc] initWithFormat:
    @"document.getElementsByTagName('span')[0].style.webkitTextSizeAdjust='%d%%'",
    fontSize];
[_postContentUIWV stringByEvaluatingJavaScriptFromString:jsString];

[_postContentView addSubview:_postContentUIWV];

And the part of HTML inside UIWebView:

<p style="text-align: justify;">
    <span style="line-height: 1.5em;">blablablablablabla</span>
</p>

My code doesn't increase the font size inside UIWebView. How can I solve it?

Answer 1

Leave the code related to creation and initialization of _postContentUIWV inside the viewDidLoad method:

- (void)viewDidLoad
{
    [super viewDidLoad];

    CGRect  rect = _postContentView.bounds;
    _postContentUIWV = [[UIWebView alloc] initWithFrame:rect];
    _postContentUIWV.delegate = self;
    [_postContentUIWV loadHTMLString:selectedPostCD.content baseURL:nil];
    [_postContentView addSubview:_postContentUIWV];
}

Move the code related to evaluation of jsString to the webViewDidFinishLoad method:

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
    int fontSize = 30;
    NSString *jsString = [[NSString alloc] initWithFormat:
        @"document.getElementsByTagName('span')[0].style.webkitTextSizeAdjust='%d%%'",
        fontSize];
    [_postContentUIWV stringByEvaluatingJavaScriptFromString:jsString];
}

Answer 2

Moreover, you can concatenate string to existing HTML inside UIWebView:

NSString * htmlString = @"<style>p {font-size:28px}</style>";
makeBiggerCssString = [makeBiggerCssString stringByAppendingString:
                       selectedPostCD.content];
[_postContentUIWV loadHTMLString: htmlString baseURL:nil];

Answer 3

Try this method:

NSString *htmlString =[NSString stringWithFormat:@"<font face='Font_name' size='30'>%@", Yourstring];
[webview loadHTMLString:htmlString baseURL:nil];