objective c - Can anyone provide me an example of how to sort an array by date? -

I have an array that stores events received through an object; I want to sort them according to date I have read that "sortedArrayUsingSelector: on the array, to provide the selector for comparison: the method ', but I do not know how to use it at all. Does anyone provide me an example ?

< / Div> P> Once you take your array, consider:

  NSArray * sortedArray = [Event sortedUruseingcomputer: ^ NSCOPER ARIAN RESULT (EKEVENT * EVENT 1, EKEVENT * EVENT 2) {Return of Event 1. Start Date: Event 2. StartDate  
  - sortedArrayUsingComparator    NSComparator  block, which is defined as the following: 
 
  Type-cap NSC transit Result (^ nscampiator) (id ogje1, id ogje2);  
 
 You can basically think about it as a block (a lambda-function) There are two logic arguments, and you tell a  NSComparisonResult  member that the order of two objects given is dependent on the type of object that you have in your array. Inclined, in this case,  EKEvent  s depends on you how you sort them; For more information and rules, read on  NSArray  will call your block several times, every time two items will be presented, unless the ARA is classified. 
 
 Now, lucky you,  EKEvent , exposes a selector who knows how to compare to  EKEvents   NSArray  There is another way you can use, and you can tell it only to use the select selector which reveals EKEvent: 
 
  NSArray * sortedArray = [events sortedArrayUsingSelector : @selector (compareStartDateWithEvent :)];  
 
 will now call  NSArray  - compareStartDateWithEvent:  Each time it wants to compare two objects if you want it, you can You can use it. Otherwise, use the comparator method above.