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Letamp;#39;s revisit the string to int conversion problem. Remember that this invocation should return an int value or nil if the string canamp;#39;t be converted. But of course, z is a plain old int. It canamp;#39;t store nil. Thatamp;#39;s why the compileramp;#39;s complaining. Itamp;#39;s time to make an optional. Z shouldnamp;#39;t be an int. It should be an optional that can store either of two things, an int or nil. We change the data type of z, and the compiler is happy. Letamp;#39;s look at our other example, a property that should be able to be nil. Hereamp;#39;s our simple View Controller subclass, and we want it to have a button property, but it wonamp;#39;t have a value right away. The value will be assigned after itamp;#39;s constructed, perhaps by Storyboard. But the compiler wonamp;#39;t accept it, because this is not an optional, it canamp;#39;t store nil. So the class canamp;#39;t ever be created. Thereamp;#39;s no button value set in the constructor. We
