Making an array of integers in iOS

Question

If you want to make an array of integers  can you use NSInteger  Do you have to use NSNumber  If so  then why

User · Accepted Answer

You can use a plain old C array   NSInteger myIntegers 40    for  NSInteger i   0  i  lt  40  i        myIntegers i    i      to get one of them NSLog    The 4th integer is   d   myIntegers 3      Or  you can use an NSArray or NSMutableArray  but here you will need to wrap up each integer inside an NSNumber instance  because NSArray objects are designed to hold class instances    NSMutableArray  myIntegers    NSMutableArray array    for  NSInteger i   0  i  lt  40  i         myIntegers addObject  NSNumber numberWithInteger i        to get one of them NSLog    The 4th integer is        myIntegers objectAtIndex 3        or NSLog    The 4th integer is   d     myIntegers objectAtIndex 3  integerValue

User · Answer

You can use CFArray instead of NSArray  Here is an article explaining how   CFMutableArrayRef ar   CFArrayCreateMutable NULL  0  NULL   for  NSUInteger i   0  i  lt  1000  i        CFArrayAppendValue ar   void  i     CFRelease ar      Releasing the array      The same applies for the CoreFoundation version of the other containers too

User · Answer

C array   NSInteger array 6     1  2  3  4  5  6     Objective-C Array   NSArray  array      1   2   3   4   5   6      numeric values must in that case be wrapped into NSNumbers   Swift Array   var array    1  2  3  4  5  6    This is correct too   var array   Array 1   10      NB  arrays are strongly typed in Swift  in that case  the compiler infers from the content that the array is an array of integers  You could use this explicit-type syntax  too   var array   Int     1  2  3  4  5  6      If you wanted an array of Doubles  you would use    var array    1 0  2 0  3 0  4 0  5 0  6 0     implicit type-inference   or   var array   Double     1  2  3  4  5  6     explicit type

User · Answer

If the order of your integers is not required   and if there are only unique values   you can also use NSIndexSet or NSMutableIndexSet You will be able to easily add and remove integers  or check if your array contains an integer with  -  void addIndex  NSUInteger index -  void removeIndex  NSUInteger index -  BOOL containsIndexes  NSIndexSet   indexSet   Check the documentation for more info

User · Answer

I created a simple Objective C wrapper around the good old C array to be used more conveniently  https   gist github com 4705733

User · Answer

If you want to use a NSArray  you need an Objective-C class to put in it - hence the NSNumber requirement    That said  Obj-C is still C  so you can use regular C arrays and hold regular ints instead of NSNumbers if you need to

User · Answer

I think it s a lot easier to use NSNumbers  This all you need to do   NSNumber  myNum1    NSNumber numberWithInt myNsIntValue1   NSNumber  myNum2    NSNumber numberWithInt myNsIntValue2         NSArray  myArray    NSArray arrayWithObjects  myNum1  myNum2       nil

[ios] Making an array of integers in iOS

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