I want to sort an array of NSString either alphabetically, or sorted by length… Yet, the NSSortDescriptors are confusing me… There’s probably a single line of code that can solve my problem, but I can’t figure…
- (void)sortUsingSelector:(SEL)comparator In this method, how do I refer to the first and second object to be compared ?
The selector will be sent to one of your objects, with the other object as the parameter. For example: (Rewritten for more clarity)
In the example above, where does the variable “foo” come from? Check out the rewritten version.
To answer the original question: foo is an instance variable in the class that -compareTo: is in.
This may help: http://theocacao.com/document.page/87/
It’s a simple category that allows you to create inline arrays of sort descriptors. You can then use those descriptors on an array by calling -sortedArrayUsingDescriptors:. - ScottStevenson