ios - error: Execution was interrupted, reason: Attempted to dereference an invalid ObjC Object or send it an unrecognized selector -


app crashed in 2nd nslog line.

debug statement: (lldb) po textview.superview error: execution interrupted, reason: attempted dereference invalid objc object or send unrecognized selector. process has been returned state before expression evaluation. (lldb)

can tell me problem.

- (void)observevalueforkeypath:(nsstring *)keypath ofobject:(id)object change:(nsdictionary *)change context:(void *)context {     if ([keypath isequaltostring:alertcontentsizekeypath]) {         uitextview * textview = object;         nslog(@"textview :: %@", textview);         nslog(@"bounds :: %f", [textview bounds].size.height);         cgfloat topcorrect = ([textview bounds].size.height - [textview contentsize].height * [textview zoomscale])/2.0;         topcorrect = ( topcorrect < 0.0 ? 0.0 : topcorrect );         textview.contentoffset = (cgpoint){.x = 0, .y = -topcorrect};     } }

thanks


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