In iOS, calculate the maximum and minimum numbers of array elements, and in ios Array

In iOS, calculate the maximum and minimum numbers of array elements, and in ios Array

I used to calculate the maximum and minimum values of a number in the array. I was very drunk after seeing this method.

NSArray * testArray = [NSArray arrayWithObjects: @ "-2.0", @ "2.3", @ "3.0", @ "4.0", nil];

NSNumber * sum = [testArray valueForKeyPath: @ "@ sum. floatValue"];

NSNumber * avg = [testArray valueForKeyPath: @ "@ avg. floatValue"];

NSNumber * max = [testArray valueForKeyPath: @ "@ max. floatValue"];

NSNumber * min = [testArray valueForKeyPath: @ "@ min. floatValue"];

A positive number or a negative number.

For valueForKeyPath: how is this method going on, I will provide some additional instructions later.

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