objective c - iOS UI query on background thread -

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i doing processing on background thread. processing needs access ui element information (like position of uiview). research, appears background thread should allowed "query" attributes of uiview -- long not "change" attributes.

i feel better if substantiate claim. small code snippet below.

// on background thread uiview *view = [self.view viewwithtag:tag]; cgfloat xposition = view.frame.origin.x;


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