StackOverflow2013

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PO
primarykey
Id
20819006
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
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0
CommunityOwnedDate
CreationDate
2013-12-28T20:25:09.333
FavoriteCount
0
LastActivityDate
2013-12-28T20:31:15.637
LastEditDate
2013-12-28T20:31:15.637
LastEditorUserId
1737738
OwnerUserId
1737738
ParentId
20818956
PostTypeId
2
Score
6
ViewCount
0
LastEditorDisplayName
text
Body
Strictly speaking, you can't directly do what you want because of the constraints of how <code>-performSelectorOnMainThread:</code> works. However, in whatever class <code>self</code> is, you could define a method like this: <pre><code>- (void)doPop { [self.navigationController popViewControllerAnimated:YES]; } </code></pre> then <pre><code>[self performSelectorOnMainThread:@selector(doPop)]; </code></pre> To elaborate as to why you syntax isn't working: The selector passes to <code>-performSelectorOnMainThread:</code> must be a selector that either takes no argument, or a single argument of some sort of <code>id</code>. While <code>-popViewControllerAnimated:</code> is a selector that takes a single argument, that argument is of type <code>BOOL</code> (which by the way uses <code>YES</code> and <code>NO</code> not <code>TRUE</code> and <code>FALSE</code>). As well, the <code>@selector</code> will be just the name of the method, not the object you wish to invoke it upon (in this case, <code>self.navigationController</code>). Think about it in terms of messaging objects. You want the <code>self.navigationController</code> object to perform the <code>-popViewControllerAnimated:</code> selector on the main thread, so you would construct the messaging that way: <pre><code>[self.navigationController performSelectorOnMainThread:@selector(popViewControllerAnimated:) withObject:nil waitUntilDone:NO]; </code></pre> But the problem there is, again, the required argument. So since you cannot directly invoke <code>pop</code> in this manner, that's why my above suggestion. It allows you do invoke <code>perform</code> according to its semantics, then still call <code>pop</code> properly with its semantics.
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