Re: Checking One Array Against Another
Re: Checking One Array Against Another
- Subject: Re: Checking One Array Against Another
- From: Ashley Clark <email@hidden>
- Date: Sat, 29 Nov 2008 12:58:51 -0600
On Nov 29, 2008, at 12:47 PM, Pierce Freeman wrote:
NSMutableSet *openApplicationsSet = [NSSet
setWithArray:openApplications];
While openApplicationsSet is declared to be an NSMutableSet you are
not creating one. Your assignment should be [NSMutableSet
setWithArray:...]
NSSet *allowedApplicationsSet = [NSSet
setWithArray:applicationsAllowedMutableArray];
NSMutableSet *badApplicationsSet = [openApplicationsSet
minusSet:allowedApplicationsSet];
The minusSet: method doesn't return a new object. It mutates the
receiver, in this case openApplicationsSet, by removing items it
shares in common with the passed in set, allowedApplicationsSet.
NSAlert * askToContinue = [NSAlert alertWithMessageText:@"Warning!"
defaultButton:@"Continue"
alternateButton:@"Quit"
otherButton:nil
informativeTextWithFormat:@"Quit %@.", badApplicationsSet];
Ashley
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