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//Create a view to hold the label and add images or whatever, place it off screen at -100     UIView *alertview = [[ UIView alloc ] initWithFrame : CGRectMake ( 0 , - 100 , CGRectGetWidth ( self . view . bounds ), 100 )];     alertview. backgroundColor =[ UIColor redColor ];     //Create a label to display the message and add it to the alertView     UILabel *theMessage = [[ UILabel alloc ] initWithFrame : CGRectMake ( 0 , 0 , CGRectGetWidth (alertview. bounds ), CGRectGetHeight (alertview. bounds ))];          theMessage. text = @"Hey Alert showing" ;     [alertview addSubview :theMessage];     //Add the alertView to your view     [ self . view addSubview :alertview];     //Create the ending frame or where you want it to end up on screen, in this case 0 y origin     CGRect newFrm = alertview. frame ;     newFrm. origin . y = 0 ; ...

//Hide [ _webView   stringByEvaluatingJavaScriptFromString : @"document.getElementsByClassName(\"cseSearchHeader\")[0].style.display=\"none\";" ];     //Show [ _webView stringByEvaluatingJavaScriptFromString : @"document.getElementsByClassName(\"cseSearchHeader\")[0].style.display=\"block\";" ];    

Just use this code to change the content coming from Web url or Html data.(Used Javascript replace query with ios) and load it by change content of html.   [ _webView stringByEvaluatingJavaScriptFromString : @"document.getElementById('images').innerHTML = ' 图片 '" ];