CODEWITHSUNDEEP
iosarchitecturensnotificationcenternsnotifications
Liron
Liron

Reputation: 2032

Sending NSNotifications to all objects of a class

I have an object that can be selected by a user click. With the current requirements of the app, at any time, there is no more than one of these items selected at any point during app execution.

I implemented a mechanism to enforce this, as follows:

Is this a decent approach to the problem? If not, how would you do it?

Upvotes: 0

Views: 55

Answers (2)

Amit
Amit

Reputation: 1043

If the object is spread all over the app,i.e. if it is a member in various classes. You can have a global object of same type and assign it to only that object which has been touched. In steps it will be like:

  • Have a global variable of object type.
  • At any object touch assign globalObject = currentObject;
  • do all operations on globalObject throughout app like calling methods and modifying object members(have a check for nil to ensure safety).
  • Reassign to different object with new touch.

Upvotes: 0

tigloo
tigloo

Reputation: 654

It is a decent way of doing it, although it is not very efficient. The more objects you have, the more time you spend comparing IDs. The easiest way is to store your object pointers and IDs in a map table (or similar) and remember the last selected object. Whenever you select a new object, you clear the selection flag of the last selected object, then look up the new object and set its selection flag. It requires you to keep a collection of your objects, though.

The time required to update selections with this approach is independent of the number of objects you have.

Upvotes: 1

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