Amy Heavey wrote:
... I've tried just using strings, but the applicationSupportFolder
returns a string, which then is immutable so I can't add to it?
There's a significant misconception lurking here.
None of the NSString methods for appending or deleting actually
modify the NSString they are applied to. A new NSString instance is
created that contains a copy of the original's contents plus whatever
contents is to be appended, or minus the contents to be deleted, or
with some parts replaced, or whatever the operation is. The original
NSString is never modified in any way.
The methods whose name starts with "string", as in
"stringByAppendingString", return an NSString object that the caller
does not own. See the Memory Management Guide on ownership for the
consequences (i.e. the uses of retain and release).
Also see the NSString reference doc, and read the descriptions under
stringByAppendingString and others. Example:
"Returns a new string made by appending a given string to the receiver"
The critical words are "a new string" and "made by".
The same is true of NSMutableString, when those same methods are
applied. A new NSString is made that contains the altered copy of
the contents, and that instance is returned.
The only NSMutableString methods that modify the target object are
the ones listed under "Modifying a String" in the NSMutableString
reference doc. All the methods inherited from NSString are non-
modifying.
http://developer.apple.com/mac/library/documentation/Cocoa/Reference/
Foundation/Classes/NSMutableString_Class/Reference/Reference.html
-- GG
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