I have an NSMutableArray of sorted objects, which are displayed in a UITableView.
I want to insert a new object into the array and update the table view - which requires the index of the newly inserted object.
I can't find any system message to tell me the correct insertion index into the array which I need to update the table view.
The best I can find is:
or
Surely, there must be a message to find the insertion position in a sorted array? Or am I missing something obvious here?
You can use indexOfObject:inSortedRange:options:usingComparator:
method on the entire array. This method performs a binary search on a range that you pass, and gives you the insertion point when you use the NSBinarySearchingInsertionIndex
option:
NSUInteger insPoint = [myArray
indexOfObject:toInsert
inSortedRange:NSMakeRange(0, [myArray count])
options:NSBinarySearchingInsertionIndex
usingComparator:^(id lhs, id rhs) {
return // return the result of comparing two objects
}
];
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