objective c - reloadData Crashing iOS App -

i'm doing twitter request api data with:

twrequest *postrequest = [[twrequest alloc] initwithurl:[nsurl urlwithstring:@"http://search.twitter.com/search.json?q=a2zwedding&include_entities=true"] parameters:nil requestmethod:twrequestmethodget]; 

then i'm getting processing request with:

[postrequest performrequestwithhandler:^(nsdata *responsedata, nshttpurlresponse *urlresponse, nserror *error) {     // nsstring *output;     nsarray *results;      if ([urlresponse statuscode] == 200) {         nserror *jsonparsingerror = nil;         nsdictionary *publictimeline = [nsjsonserialization jsonobjectwithdata:responsedata options:0 error:&jsonparsingerror];         results = [publictimeline objectforkey:@"results"];      }     [self performselectoronmainthread:@selector(populatetable:) withobject:results waituntildone:yes];         }]; 

i'm trying display "results" in uitableview. delegate , datasource same view controller processing json data. datasource method of:

- (nsinteger)tableview:(uitableview*)tableview numberofrowsinsection:(nsinteger)section 

is returning 0 if try count of array because json parsing isn't finished when gets called. if "return 1" method, displays 1 of results twitter request. however, if use reloaddata app crashes. cannot delay count. ideas?

in .h

//use datasource @property(nonatomic, strong)nsarray *myresultdata; 

.m

@synthesize myresultdata;  [postrequest performrequestwithhandler:^(nsdata *responsedata, nshttpurlresponse *urlresponse, nserror *error) { // nsstring *output; nsarray *results;  if ([urlresponse statuscode] == 200) {     nserror *jsonparsingerror = nil;     nsdictionary *publictimeline = [nsjsonserialization jsonobjectwithdata:responsedata options:0 error:&jsonparsingerror];     results = [publictimeline objectforkey:@"results"];      if(![results iskindofclass:[nsnull class]])        {           myresultdata = [nsarray alloc]initwitharray:results];        }        [self.tableview reloaddata]; } }];