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iOS How Delete the oldest object in NSMutableSet?
- Thread starter Sergio10
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First, removeLastObject: is an instance method for NSMutableArray, not NSMutableSet.
Second, you'll probably need to keep track of the "oldest" object separately and then call
Second, you'll probably need to keep track of the "oldest" object separately and then call
Code:
[mySet removeObject:oldestObject];
NSSet and NSMutableSet are unordered collections, so you should probably choose some other data structure if you need to store items in order - like NSMutableArray.
The method removeLastObject will give you the last object that was added at the end of the array. If you want the "oldest" item in an array, you probably want to do something like this:
Remember to retain "oldest" if you need it to stick around - it might get dealloc'd when the array releases it.
The method removeLastObject will give you the last object that was added at the end of the array. If you want the "oldest" item in an array, you probably want to do something like this:
Code:
id oldest = [myMutableArray objectAtIndex:0];
[muMutableArray removeObjectAtIndex:0];Remember to retain "oldest" if you need it to stick around - it might get dealloc'd when the array releases it.