ios - NSDictionary with no data at all -

i trying save data plist file created xcode.

var dict: nsmutabledictionary = nsmutabledictionary(contentsoffile: plistpath);  dict = nsmutabledictionary(dict.setvalue(speedstring, forkey: "speed"));  if (!dict.writetofile(plistpath, atomically: true)) {     nslog("failed save data"); } 

the dictionary safely wrote file.
problem set break point after if statement, debugger showed nsdictionary has 0key/value pair, weird. in xcode, added key/value pair in it.

i added code test

if (dict.valueforkey("speed") == nil) {     nslog("key missing"); } 

the console did print out "key missing".

your second line creates new dictionary. throwing away dictionary read in first line. not appending dictionary, replacing new empty dictionary.