removeObjectAtIndex

removeObjectAtIndex:

Removes the object at index .

- (void)removeObjectAtIndex:(NSUInteger)index

Parameters

index

The index from which to remove the object in the array. The value must not exceed the bounds of the array.

Important: Raises an NSRangeException if index is beyond the end of the array.

Discussion

To fill the gap, all elements beyond index are moved by subtracting 1 from their index.

E.g:

    CAPropertyAnimation * nextAnimation = [[self sequenceOfAnimations] objectAtIndex:0];

    [[self sequenceOfAnimations] removeObjectAtIndex:0];

Assigning nextAnimation with object at index 0 and after that we removed.Thing is all objects beyond index 0 are shifted one place left to fill the gap.So the above two lines act like a queue,always first object will be removed.

sequenceOfAnimations array has contents in this fashion

[obj1,obj2,obj3,obj4,obj5,nil];

removeObjectAtIndex:0

now sequenceOfAnimations will be [obj2,obj3,obj4,obj5,nil];

removeObjectAtIndex:0

now sequenceOfAnimations will be [obj3,obj4,obj5,nil];