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Xcode 6 Start to Finish: iOS and OS X Development, Second Edition by Fritz Anderson

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16. Measurement and Analysis

Passer Rating has quite a way to go before it’s useful for the general public, but you’ve run it several times, and begun a testing régime, and you’re pretty confident that to the naked eye, it works.

As usual, the qualifier (“to the naked eye”) outweighs “it works.” There are issues in Passer Rating of speed and memory performance. Before you can act, you have to know what’s going on—you have to profile the app. The Instruments application is the tool for profiling applications.

Note

If you follow along with me—I recommend starting from the sample code for the end of the previous chapter—your statistics won’t match mine. You and I have different computers, different devices, different operating systems, background ...

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