Question

I want to take a screenshot and then send to webview a local path for it, so it will show it. I know that webview could take images from NSBundle but this screenshots are created dynamically – can I add something to it by code?

I was trying it like this:

  UIGraphicsBeginImageContext( webView.bounds.size);    
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();    

    NSString *file = @"myfile.png";
    NSString *directory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) objectAtIndex:0];
    NSString *path = [directory stringByAppendingPathComponent: file];
    [UIImagePNGRepresentation(viewImage) writeToFile:path atomically:YES];

    NSString *function = [NSString stringWithFormat:@"loadImagePlease(%@);",path];
    [ ad stringByEvaluatingJavaScriptFromString:function];

But loadImageFunction can’t access it , with file:/// or file:// prefix. What’s the solution?
Thanks for ANY help.

EDIT: added a missing line in code

SOLUTION: I used a Cyrille’s advice and this library for encoding : http://cocoawithlove.com/2009/06/base64-encoding-options-on-mac-and.html

Answer 1

Convert it to a base64 data URI scheme and send that via Javascript as you’re currently doing :

someDOMelement.src = 'url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUA
AAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO
9TXL0Y4OHwAAAABJRU5ErkJggg==)';