Extract UIImage from NSAttributed String
Solution 1:
You have to enumerate the NSAttributedString
looking for NSTextAttachment
s.
NSMutableArray *imagesArray = [[NSMutableArray alloc] init];
[attributedString enumerateAttribute:NSAttachmentAttributeName
inRange:NSMakeRange(0, [attributedString length])
options:0
usingBlock:^(id value, NSRange range, BOOL *stop)
{
if ([value isKindOfClass:[NSTextAttachment class]])
{
NSTextAttachment *attachment = (NSTextAttachment *)value;
UIImage *image = nil;
if ([attachment image])
image = [attachment image];
else
image = [attachment imageForBounds:[attachment bounds]
textContainer:nil
characterIndex:range.location];
if (image)
[imagesArray addObject:image];
}
}];
As you can see, there is the test if ([attachment image])
. That's because it seems that if you created the NSTextAttachment
to put with NSAttachmentAttributeName
it will exist and your image will be there. But if you use for example an image from the web and convert it as a NSTextAttachment
from a HTML code, then [attachment image]
will be nil and you won't be able to get the image.
You can see using breakpoints with this snippet (with setting real image URL and an real image name from bundle. NSString *htmlString = @"http://anImageURL\">Blahttp://anOtherImageURL\"> Test retest";
NSError *error;
NSAttributedString *attributedStringFromHTML = [[NSAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUTF8StringEncoding]
options:@{NSDocumentTypeDocumentAttribute:NSHTMLTextDocumentType,
NSCharacterEncodingDocumentAttribute:@(NSUTF8StringEncoding)}
documentAttributes:nil
error:&error];
NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
[textAttachment setImage:[UIImage imageNamed:@"anImageNameFromYourBundle"]];
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithAttributedString:attributedStringFromHTML];
[attributedString appendAttributedString:[NSAttributedString attributedStringWithAttachment:textAttachment]];
Solution 2:
In Swift 3: (with macOS equivalent here)
func textViewDidChange(_ textView: UITextView) {
// other code...
let range = NSRange(location: 0, length: textView.attributedText.length)
if (textView.textStorage.containsAttachments(in: range)) {
let attrString = textView.attributedText
var location = 0
while location < range.length {
var r = NSRange()
let attrDictionary = attrString?.attributes(at: location, effectiveRange: &r)
if attrDictionary != nil {
// Swift.print(attrDictionary!)
let attachment = attrDictionary![NSAttachmentAttributeName] as? NSTextAttachment
if attachment != nil {
if attachment!.image != nil {
// your code to use attachment!.image as appropriate
}
}
location += r.length
}
}
}
}
Solution 3:
I converted the code Larme to swift 3
var imagesArray = [Any]()
textView.attributedText.enumerateAttribute(NSAttachmentAttributeName, in: NSRange(location: 0, length: textView.attributedText.length), options: [], using: {(value,range,stop) -> Void in
if (value is NSTextAttachment) {
let attachment: NSTextAttachment? = (value as? NSTextAttachment)
var image: UIImage? = nil
if ((attachment?.image) != nil) {
image = attachment?.image
} else {
image = attachment?.image(forBounds: (attachment?.bounds)!, textContainer: nil, characterIndex: range.location)
}
if image != nil {
imagesArray.append(image)
}
}
})