objective c - Sort a complex NSarray -

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i have nsarray *userinputs, array contains custom objects "userinput".

@interface userinput :nsobject {  nsstring *page_id;  @end

each userinput ( instance of userinput) belog bookpage.

@interface bookpage: nsobject {  nsstring *pageprefix;   ( exemple : pageprefix = @"k1") @end

from each userinput know witch bookpage it's belong :

bookpage *bookpage = [self.book pagewithid:userinput.page_id];

how can sort array of userinputs ( instances of userinputs) pageprefix key. answers ?

you can sort array of custom object this:

nssortdescriptor *asortdescriptor = [[nssortdescriptor alloc] initwithkey:@"pageprefix" ascending:yes];  [userinputs sortusingdescriptors:[nsarray arraywithobject:asortdescriptor]];

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