NSMutableAttributedString富文本

NSMutableAttributedString *string = [[NSMutableAttributedString alloc] init];

[string appendAttributedString:[[NSMutableAttributedString alloc] initWithString:@"hello world"]];

        NSTextAttachment *attach = [[NSTextAttachment alloc] init];

        attach.image= [UIImageimageNamed:@"图片名字"];

        attach.bounds=CGRectMake(0,0,10,14);

        NSAttributedString *attachString = [NSAttributedString attributedStringWithAttachment:attach];

        [stringinsertAttributedString:attachStringatIndex:2]; //插入的下标