Swift iOS NSDictionary setValue crash - but why? -

i have code (porting language, hence bit different naming conventions, please bear now)

var fdefaultslist: nsdictionary = [string:string](); let tmpkey: string = tmpkeyvalue[0]; let tmpvalue: string = tmpkeyvalue[1];     if (tmpkey != "") && (tmpvalue != "") {   //let tmpanyobjectvalue: anyobject? = tmpvalue;   //fdefaultslist.setvalue(tmpanyobjectvalue, forkey: tmpkey);   fdefaultslist.setvalue(tmpvalue, forkey: tmpkey); } 

however, no matter setvalue variation use, call setvalue throws error (not meaningful far can tell) , exits app (xcode editor taken class appdelegate: uiresponder, uiapplicationdelegate)

i guess using nsdictionary wrong? trying read in text file each line key=value strings

you should declare actual nsmutabledictionary instead of casting nsdictionary.

and can use subscript bit simpler use setvalue (which should setobject):

var fdefaultslist = nsmutabledictionary() let tmpkey: string = "a" let tmpvalue: string = "b" if tmpkey != "" && tmpvalue != "" {     fdefaultslist[tmpvalue] = tmpkey } 

a more "swifty" version be:

var defaultslist = [string:string]() let tmpkey = "a" let tmpvalue = "b" if !tmpkey.isempty && !tmpvalue.isempty {     defaultslist[tmpvalue] = tmpkey }