macOS How to make a file save on Xcode?

I think one of us is in way over their head, but for a TextEdit-like application, how about downloading and/or taking a look at the TextEdit source code?

https://developer.apple.com/library/mac/samplecode/TextEdit/Introduction/Intro.html

I'd like to point out that .txt isn't a file format unique to TextEdit, but a common file format used by numerous text editting programs on numerous platforms, including but not limited to:
TextEdit
Notepad
Notepad++
gEdit
Sublime Text
TextWrangler
BBEdit

Also, numerous IDEs and Word Processors can open them, including Xcode and Word.

ArtOfWarfare said:

I'd like to point out that .txt isn't a file format unique to TextEdit, but a common file format used by numerous text editting programs on numerous platforms, including but not limited to:

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It's not a format at all actually, .txt just indicates that the file contains plain text what ever that means.

OSX Buddy said:

Yeah but on some apps, it just has another extension like in ibooks author, it has an extension of .iba

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.iba is a proper file format, and also a proprietary Apple format. txt is no format at all, the file contains nothing but content, just pure text.

OSX Buddy said:

I can't find the save and load script

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Not sure what you mean by "script", but the various menu and document actions are typically connected to methods that use NSOpenPanel and NSSavePanel to specify files to use to, well, open and save. The actual reading from and writing to a file would depend on the particular application and whatever document or data types and encodings it is using.

subsonix said:

.iba is a proper file format, and also a proprietary Apple format. txt is no format at all, the file contains nothing but content, just pure text.

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I'm not sure that your argument makes sense... How is a text file different from a binary, if not by the format?

ArtOfWarfare said:

I'm not sure that your argument makes sense... How is a text file different from a binary, if not by the format?

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Binary data can also be stored without any file format, in a raw form. A file format is an agreed upon standard on how data is stored and laid out in the file.

subsonix said:

.iba is a proper file format, and also a proprietary Apple format. txt is no format at all, the file contains nothing but content, just pure text.

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Which makes it a file format, just a very simple one.

gnasher729 said:

Which makes it a file format, just a very simple one.

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I disagree because there is no information about locale and character encoding, if you compare to some other text formats, say csv, at least there is an idea of layout, or a script file with a #! which could be regarded as a form of "header".

On another note, the original poster isn't asking how to make a file save on Xcode, but how to make a program which saves files.

To which I ask, in which language and with what frameworks?