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Editorial Team
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Asked: 2026-06-11T21:58:37+00:00

I have a simple method that checks for the superview of a view, and

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I have a simple method that checks for the superview of a view, and returns a BOOL. However, intermittently the method fails to produce the right answer (or at least the answer Iʻm expecting).

The method is:

-(BOOL) isTheViewShowing
{
    return (BOOL) [theView superview];
}

There is a Tap Gesture that removes the view, and I logged the following (when the undesirable happens):

isTheViewShowing: NO
theView: <UIView: 0x3c1a10; frame = (0 232; 320 135); clipsToBounds = YES; layer = <CALayer: 0x365480>>,
superView: <UIView: 0x392400; frame = (0 0; 320 367); autoresize = W+H; layer = <CALayer: 0x35fe90>>

As the log shows the superView exists, but why is the cast failing?

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1 Answer

  1. Editorial Team

    superView: <UIView: 0x392400

    Note that the low order byte of superview is 0x00. I haven’t really looked into what happens when you try to cast a pointer to a BOOL, but since a BOOL is essentially a char I wouldn’t be at all surprised if the compiler just looks at the low order byte. Try this instead:

    -(BOOL) isTheViewShowing
{
    return ([theView superview] != nil);
}

    That’s better on two counts: 1) it actually works, and 2) it better communicates what you’re trying to do.

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