Text file appear as a small box in mail body in ios objective c -

i want send 2 attachments in mail. 1 image , text file. when send both attachment in single mail, text file appears square blank box. image , text file, both files received @ receiver side , readable. issue sender cannot see text file in mail body before sending mail. code sending mail given below.

- (void)showemail:(nsstring*)file {          nsdateformatter *dateformatter = [[nsdateformatter alloc] init];     [dateformatter setdateformat:@"yyyy-mm-dd hh:mm:ss"];     nsdate *datefromstring = [dateformatter datefromstring:abc4];     [dateformatter setdateformat:@"mm/dd/yyyy"];     nsstring *titledate=[dateformatter stringfromdate:datefromstring];     nsstring *emailtitle = [nsstring stringwithformat:@"(%@)",titledate];     [dateformatter setdateformat:@"mm/dd/yyyy hh:mm:ss"];     nsstring *subjectdate=[dateformatter stringfromdate:datefromstring];     nsstring *messagebody = [nsstring stringwithformat:@"%@ %@",abc,subjectdate];     //nsarray *torecipents = [nsarray arraywithobject:self.txtfldemail.text];       mfmailcomposeviewcontroller *mc = [[mfmailcomposeviewcontroller alloc] init];     mc.mailcomposedelegate = self;     [mc setsubject:emailtitle];     [mc setmessagebody:messagebody ishtml:no];     //[mc settorecipients:torecipents];          // determine file name , extension      nsarray *filepart = [file componentsseparatedbystring:@"."];     nsstring *filename = [filepart objectatindex:0];     nsstring *extension = [filepart lastobject];      // resource path , read file using nsdata     //nsstring *filepath = [[nsbundle mainbundle] pathforresource:filename oftype:extension];         //nsstring *xyz=[[nsuserdefaults standarduserdefaults]valueforkey:@"readpath"];     nsdata *filedata;     nsdata *filedata1;      if ([title isequaltostring:@"excel"]) {         filedata = [nsdata datawithcontentsoffile:filepath];         nsstring *xyz=[[nsuserdefaults standarduserdefaults]valueforkey:@"commentfilelocation"];         filedata1=[nsdata datawithcontentsoffile:xyz];         nslog(@"filedata1>>%@",filedata1);     }     else if([title isequaltostring:@"screenshot"])     {     nsstring *xyz=[[nsuserdefaults standarduserdefaults]valueforkey:@"readpath"];     filedata = [nsdata datawithcontentsoffile:xyz];     nsstring *xyz1=[[nsuserdefaults standarduserdefaults]valueforkey:@"commentfilelocation"];     nslog(@"xyz1>>%@",[[nsuserdefaults standarduserdefaults]valueforkey:@"commentfilelocation"]);     filedata1=[nsdata datawithcontentsoffile:xyz1];      }      // determine mime type     nsstring *mimetype;     if ([extension isequaltostring:@"jpg"]) {         mimetype = @"image/jpeg";     } else if ([extension isequaltostring:@"png"]) {         mimetype = @"image/png";     } else if ([extension isequaltostring:@"doc"]) {         mimetype = @"application/msword";     } else if ([extension isequaltostring:@"ppt"]) {         mimetype = @"application/vnd.ms-powerpoint";     } else if ([extension isequaltostring:@"html"]) {         mimetype = @"text/html";     } else if ([extension isequaltostring:@"txt"]) {         mimetype = @"text/html";     } else if ([extension isequaltostring:@"pdf"]) {         mimetype = @"application/pdf";     } else if ([extension isequaltostring:@"csv"]) {         mimetype = @"text/csv";     }      nsstring *mimetype1;     if ([extension isequaltostring:@"jpg"]) {         mimetype1 = @"image/jpeg";     } else if ([extension isequaltostring:@"png"]) {         mimetype1 = @"image/png";     } else if ([extension isequaltostring:@"doc"]) {         mimetype1 = @"application/msword";     } else if ([extension isequaltostring:@"ppt"]) {         mimetype1 = @"application/vnd.ms-powerpoint";     } else if ([extension isequaltostring:@"html"]) {         mimetype1 = @"text/html";     }else if ([extension isequaltostring:@"txt"]) {         mimetype1 = @"text/html";     }else if ([extension isequaltostring:@"pdf"]) {         mimetype1 = @"application/pdf";     }else if ([extension isequaltostring:@"csv"]) {         mimetype1 = @"text/csv";     }      // add attachment     [mc addattachmentdata:filedata mimetype:mimetype filename:file];       nsdateformatter *dateformatter1 = [[nsdateformatter alloc] init];     [dateformatter1 setdateformat:@"yyyy-mm-dd hh:mm:ss"];     nsdate *datefromstring1 = [dateformatter1 datefromstring:abc4];     [dateformatter1 setdateformat:@"mm.dd.yyyy"];     nsstring *titledate1=[dateformatter1 stringfromdate:datefromstring1];     nsstring *commentfilename=[nsstring stringwithformat:@"%@ %@ comments.txt",abc,titledate1];     [mc addattachmentdata:filedata1 mimetype:mimetype1 filename:commentfilename];     [![enter image description here][1]][1]     // present mail view controller on screen     [self presentviewcontroller:mc animated:yes completion:null]; } 

the screenshot of mail attached in question.

probably should try change mime type. did tryed use text/plain example? instead of

if ([extension isequaltostring:@"txt"]) {         mimetype1 = @"text/html"; }