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- (CGRect)attachmentBoundsForTextContainer:(NSTextContainer *)textContainer
                      proposedLineFragment:(CGRect)lineFrag
                             glyphPosition:(CGPoint)position
                            characterIndex:(NSUInteger)charIndex

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Returns the layout bounds of the text attachment to the layout manager. (required)

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Defines the layout bounds of the receiver's graphical representation in the text coordinate system.

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@interface EmojiTextAttachment : NSTextAttachment

@property(strong, nonatomic) NSString *emojiTag;


@property(assign, nonatomic) CGSize emojiSize;
@end

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@implementation EmojiTextAttachment


- (CGRect)attachmentBoundsForTextContainer:(NSTextContainer *)textContainer proposedLineFragment:(CGRect)lineFrag glyphPosition:(CGPoint)position characterIndex:(NSUInteger)charIndex {
	
    return CGRectMake(0, 0, _emojiSize.width, _emojiSize.height);
}
@end