NSArray remove item from array

Question

How to remove an item from NSArray

User · Answer

Remove Object from NSArray with this Method   - NSArray    removeObjectFromArray  NSArray    array withIndex  NSInteger  index       NSMutableArray  modifyableArray     NSMutableArray alloc  initWithArray array        modifyableArray removeObjectAtIndex index       return   NSArray alloc  initWithArray modifyableArray

User · Answer

Made a category like mxcl  but this is slightly faster    My testing shows  15  improvement  I could be wrong  feel free to compare the two yourself     Basically I take the portion of the array thats in front of the object and the portion behind and combine them  Thus excluding the element   -  NSArray   prefix arrayByRemovingObject  id object        if   object            return self             NSUInteger indexOfObject    self indexOfObject object       NSArray  firstSubArray    self subarrayWithRange NSMakeRange 0  indexOfObject        NSArray  secondSubArray    self subarrayWithRange NSMakeRange indexOfObject   1  self count - indexOfObject - 1        NSArray  newArray    firstSubArray arrayByAddingObjectsFromArray secondSubArray        return newArray

User · Answer

NSMutableArray  arrayThatYouCanRemoveObjects    NSMutableArray arrayWithArray your array     arrayThatYouCanRemoveObjects removeObjectAtIndex your object index     your array release     your array     NSArray arrayWithArray  arrayThatYouCanRemoveObjects  retain     that s about it  if you dont own your array i e it s autoreleased  remove the release  amp  retain messages

User · Answer

Here s a more functional approach using Key-Value Coding    implementation NSArray  Additions   -  instancetype arrayByRemovingObject  id object       return  self filteredArrayUsingPredicate  NSPredicate predicateWithFormat   SELF         object        end

User · Answer

As others suggested  NSMutableArray has methods to do so but sometimes you are forced to use NSArray  I d use   NSArray  newArray    oldArray subarrayWithRange NSMakeRange 1   oldArray count  - 1      This way  the oldArray stays as it was but a newArray will be created with the first item removed

User · Answer

NSArray is not mutable  that is  you cannot modify it  You should take a look at NSMutableArray  Check out the  Removing Objects  section  you ll find there many functions that allow you to remove items    anArray removeObjectAtIndex  index    anArray removeObject  item    anArray removeLastObject

User · Answer

This category may be to your taste  But  Be frugal with its usage  since we are converting to a NSMutableArray and back again  it s not at all efficient    implementation NSArray  mxcl   -  NSArray   arrayByRemovingObject  id obj       if   obj  return  self copy      copy because all array  methods return new arrays     NSMutableArray  mutableArray    NSMutableArray arrayWithArray self        mutableArray removeObject obj       return  NSArray arrayWithArray mutableArray       end

[iphone] NSArray + remove item from array

Examples related to iphone

Examples related to nsarray