iOS NSDictionary pass through function -

i have view controller named secondviewcontroller , when user selects article wants read, want navigate thirdviewcontroller , pass nsdictionary article data.

- (void) touchbuttonblock:(nsinteger) select {      nslog(@"touchbuttonblock");     nsdictionary *dict;     switch (select) {         case 0:         {             nsmutabledictionary *tmpdict = [[nsmutabledictionary alloc] init];             nsmutabledictionary *val = [[nsmutabledictionary alloc] init];             [val setobject:@"article360.html" forkey:@"page"];             [val setobject:@"img.png" forkey:@"img"];             [val setobject:@"art1" forkey:@"name"];              [tmpdict setobject:val forkey:[nsnumber numberwithint:0]];              val = [[nsmutabledictionary alloc] init];             [val setobject:@"article360.html" forkey:@"page"];             [val setobject:@"img.png" forkey:@"img"];             [val setobject:@"art2" forkey:@"name"];              [tmpdict setobject:val forkey:[nsnumber numberwithint:1]];              dict = [nsdictionary dictionarywithdictionary:tmpdict];              //[tmpdict release];             //[val release];             break;         }     nsdictionary *immdict = [nsdictionary dictionarywithdictionary:dict];      articleselectlistviewcontroller *selectorview = [[articleselectlistviewcontroller alloc] initwitharticlesdata:immdict];     [self.navigationcontroller pushviewcontroller:selectorview animated:yes];     [selectorview release]; } 

here assing nsdicitionary:

- (id)initwitharticlesdata:(nsdictionary *)data {     self = [super initwithnibname:nil bundle:nil];     if (self)     {         articles = data;      ... } 

but in other functions being called after user interaction articles variable seems incorrect - doesn't contain data.

where make mistake ?

make copy of dictionary , assign it.

 - (id)initwitharticlesdata:(nsdictionary *)data     {         self = [super initwithnibname:nil bundle:nil];         if (self)         {             articles = [data copy];          ...     }