How do I get a custom text equivalent of an NSAttributedString containing a UIImage?
I have a chat application where I need to send images (emoticons) along with text.
Now I can add an image via NSTextAttatchment
(below code)
NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
NSString *img=[NSString stringWithFormat:@"%@.png",imgName];
textAttachment.image =[UIImage imageNamed:img];
NSAttributedString *attrStringWithImage = [NSAttributedString attributedStringWithAttachment:textAttachment];
NSMutableAttributedString *nStr=[[NSMutableAttributedString alloc]initWithAttributedString:_txtChat.attributedText];
[nStr appendAttributedString:attrStringWithImage];
_txtChat.attributedText =nStr;
Now I want custom text to add " :)
" to the smile icon so that when called, it _txtChat.text
returns :) instead UIImage
. So if the user sees Hii <Smilie>
, I would get "Hii :)"
. I can't figure out if this can be done.
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I got the solution myself. We need to do the following: -
1. To get the content, we need to add a method (richText) to the UITextView (customCategory), for example UITextView (RichText) (the text is already there, so I recommend richText) to get the desired text values.
2. Save your own text in the NSTextAttachment. This was done by subclassing NSTextAttachment (in customNSTextAttatchment) and adding a custom @property id.
Now, after creating a customNSTextAttachment (similar to the code in my question), we can assign our desired NSString to custom.
To get it, we do the following:
@implementation UITextView(RichText)
-(NSString*)richText
{
__block NSString *str=self.attributedText.string; //Trivial String representation
__block NSMutableString *final=[NSMutableString new]; //To store customized text
[self.attributedText enumerateAttributesInRange:NSMakeRange(0, self.attributedText.length) options:0 usingBlock:
^(NSDictionary *attributes, NSRange range, BOOL *stop) {
//enumerate through the attributes
NSString *v;
NSObject* x=[attributes valueForKey:@"NSAttachment"];
if(x) //YES= This is an attachment
{
v=x.custom; // Get Custom value (i.e. the previously stored NSString).
if(v==nil) v=@"";
}
else v=[str substringWithRange:range]; //NO=This is a text block.
[final appendString:v]; //Append the value
}];
return final;
}
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