Saving Data in iOS - Part 6: Section 1: String | Ray Wenderlich

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Convert between bytes, Data instances, and Strings. They're all easily interchangeable when your data bytes represent Strings using your expected encoding.

This is a companion discussion topic for the original entry at https://www.raywenderlich.com/4307-saving-data-in-ios/lessons/6
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This line

try mysteryData.write(to: mysteryDataURL.appendPathExtension("txt"))

operates on a constant mysteryDataURL and my playground gives me an error to change ‘let’ to ‘var’ to make mysteryDataURL mutable. But yours isn’t mutable either… why aren’t you getting the same error?

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Subtle difference in API! You’re using appendPathExtension, which mutates a URL.

We used appendingPathExtension, which creates a new URL based on a previous URL.

Swift is full of this “ing”/non-“ing” stuff now. It can be tricky when paired with autocomplete. Sorry it bit you!

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Hey @jessycatterwaul,

I was wondering if you might now how to do the following. I have been pulling my hair out and scouring the internet trying to piece together information regarding it.

I am wanting to take a Swift class instance, and convert it into its binary data, so I can perform an XOR, and store the difference between two different instances. I would then apply or remove the stored xor result to move between the two states. Kind of like an undo/redo.

I have been pulling my hair out trying to wrap my hair around Swifts Data, and converting data to bytes.

Any help would be awesome, Thanks :slight_smile: