ios - UITableView Not updating within dispatch_async -


i trying tableview update via async code

dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^(void) {     nsstring *mainurl = @"http://myurl.com/api/";    nsstring *firstprefix = @"type=topdeals&device=";    nsstring *deviceidforurl = [nsstring stringwithformat:@"%@", devicetoken];    nsstring *stringtogotoencoder = [nsstring stringwithformat: @"%@%@", firstprefix, deviceidforurl];    nsdata *plaindata = [stringtogotoencoder datausingencoding:nsutf8stringencoding];    nsstring *base64string = [plaindata base64encodedstringwithoptions:0];    nsstring *returnurl = [nsstring stringwithformat:@"%@%@", mainurl, base64string];    nsurl *returncompletedurl = [[nsurl alloc] initwithstring:returnurl];   //nsurl *request = [nsurl urlwithstring:returncompletedurl];     nsdata *data = [nsdata datawithcontentsofurl:returncompletedurl];    nserror *error;    nsmutabledictionary *responseobject = [nsjsonserialization jsonobjectwithdata:data options:nsjsonreadingmutablecontainers error: &error];     nslog(@"%@", responseobject);     alllogos = [[responseobject valueforkey:@"data"] valueforkey:@"logo"];    allcontent = [[responseobject valueforkey:@"data"] valueforkey:@"content"];    allpostode = [[responseobject valueforkey:@"data"] valueforkey:@"postcode"];     allname = [[responseobject valueforkey:@"data"] valueforkey:@"name"];    alladdress = [[responseobject valueforkey:@"data"] valueforkey:@"address"];    alladdress2 = [[responseobject valueforkey:@"data"] valueforkey:@"address2"];    alllat = [[responseobject valueforkey:@"data"] valueforkey:@"lat"];    alllong = [[responseobject valueforkey:@"data"] valueforkey:@"lng"];    allstart = [[responseobject valueforkey:@"data"] valueforkey:@"start"];    allfinish = [[responseobject valueforkey:@"data"] valueforkey:@"finish"];    allstartnice = [[responseobject valueforkey:@"data"] valueforkey:@"nicestart"];    allfinishnice = [[responseobject valueforkey:@"data"] valueforkey:@"nicefinish"];       dispatch_sync(dispatch_get_main_queue(), ^(void)                   {                       nslog(@"%@", allcontent);                       [self.tableview reloaddata];                   }); });

my table view not updating via command.

here's .h file

@interface viewcontroller : uiviewcontroller <uitableviewdelegate, uitableviewdatasource, uipickerviewdelegate, cllocationmanagerdelegate> {     cllocationmanager *locationmanager;  } @property (weak, nonatomic) iboutlet uiactivityindicatorview *spinner; @property (weak, nonatomic) iboutlet uitableview *tableview; @property (weak, nonatomic) iboutlet uilabel *locationlabel; @property (weak, nonatomic) iboutlet uibutton *settingsbutton; @property (weak, nonatomic) iboutlet uiswitch *outswitch; @property (weak, nonatomic) iboutlet uilabel *latestdealslabel;  @property (weak, nonatomic) iboutlet uilabel *blackout;

my table view datasource "allcontent" global nsarray. can see in log "allcontent" updated correct content before updating tableview.

any appreciated.

do not call dispatch_sync function if executing task on same queue going deadlock mode.

so instead of that

    dispatch_sync(dispatch_get_main_queue(), ^(void)                                           {      //update ui in main thread           });

this link helpful

why can't use dispatch_sync on current queue?


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