ios - Can't change property of self in asynchronous block -

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i'm trying change properties of self, can't change in asynchronous block. here code:

__weak typeof(self) weakself = self;  nsurlsessiondatatask *posttask = [session datataskwithrequest:request completionhandler:^(nsdata *data, nsurlresponse *response, nserror *error) {     if (response == nil)     {         //     }     else     {         // else          dispatch_async(dispatch_get_main_queue(), ^{             nsstring *markername = [nsstring stringwithformat:@"public-%@",[weakself.pad getmarkernameforcategory:weakself.categorylabel.text]];             weakself.pad.markername = markername;              [weakself.navigationcontroller popviewcontrolleranimated:yes];         });     } }];       [posttask resume]; }

if i'm setting breakpoint after assignment weakself.pad.markername = markername markername not being set, still old value.

some project details: ios 7, arc enabled

edit

changed first line __block typeof(self) weakself = self; problem still exists.


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