iPhone:Got warning when reverse a NSMutablearray

Question

I need reverse(sort in descending order) a NSMutablearray.I tried the following code and it works,but got a warning. How could I remove the warning?

NSMutablearray *resStatusArray;

[resStatusArray sortUsingSelector:@selector(compare:)];

    resStatusArray=[[resStatusArray reverseObjectEnumerator] allObjects];

Warning:Incompitable pointer types assigning to 'NSMutablearray*_strong' from ' NSarray *'

Answer 1

user1118321 is correct in the explanation. To fix it, you would create a new mutable array. I suspect this is safer than a cast.

resStatusArray = [NSMutableArray arrayWithArray:[[resStatusArray reverseObjectEnumerator] allObjects]];

Answer 2

The allObjects method returns an NSArray*, not an NSMutableArray*, so the compiler is telling you that your assignment to an NSMutableArray* variable is incorrect.