NSAssert doesn't work

I'm trying to use NSAssert in my code but it doesn't do a thing.

In this piece of code, the as开发者_开发问答sertion should fail but doesn't:

    MSLog(@"cross.obj = %@",[cross obj]);
    NSAssert([cross obj]!=nil,@"[cross obj] == nil");

The output of this is:

cross.obj = (null)

What could be the problem?

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NS_BLOCK_ASSERTIONS blocks assertions from functioning. Try deleting the definition.

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The reason behind this is that there is a difference between a nil and a null value.

So please check it with other examples.

It will work.

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The reason might be that the result from [cross obj] is [NSNull null], not nil.

The output probably is <null> which does not mean NULL or nil but the NSNull singleton object. This object is used as a placeholder where nil is not an option (for instance in NSArrays).

Another reason might be that the NS_BLOCK_ASSERTIONS preprocessor macro is defined which disables NSAssert.