NSString *htmlString = [NSString stringWithContentsOfFile:self.webPath encoding:NSUTF8StringEncoding error:nil];UIFont *font = [UIFont systemFontOfSize:12];NSString *newHtmlString = [NSString stringWithFormat:@"<font face='%@' >%@", font.fontName,htmlString];[self.myWebView loadHTMLString:newHtmlString baseURL:[NSURL URLWithString:self.webPath]];

NSString *str = @"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '60%'";[self.myWebView stringByEvaluatingJavaScriptFromString:str];