You can put whatever you want into this dictionary that may be useful in the method that the timer invokes when it fires.
There are two ways to tell a timer what message it should send and the object to which it should send the message—by specifying each independently, or (in some cases) by using an instance of .
If you then want to look in more detail at the method you can refer back to the docs for more information, but there is explanation around the code too.
Timer not invalidating Frum sex cam
Seasoned Cocoa developers may snicker at the title of this post, because it’s probably obvious to them. Maybe I can save someone some head-scratching by relaying my tale. Now, I’ve been around the Cocoa block a few times, so I knew this to be the case (the docs state it explicitly), but I clearly hadn’t thought through the ramifications. Let’s say you have a window, isn’t called until the controller’s retain count is zero, and until the timer invalidates (which will be never, on a repeating timer), the controller’s retain count will never be zero.
The solution would be to invalidate the timer elsewhere, perhaps in on my window controller was returning an object with a retain Count of 2, when I was expecting 1.
In this case, you do need to keep a reference to the timer, so that you can send it an invalidate message whenever appropriate.
If you create an unscheduled timer (see “Unscheduled Timers”), then you must maintain a strong reference to the timer (in a reference-counted environment, you retain it) so that it is not deallocated before you use it.
Since the timer is passed as an argument when you specify its method as a selector, you can invalidate a repeating timer when appropriate within that method.
In many situations, however, you also want the option of invalidating the timer—perhaps even before it starts.In all cases, you have to configure the timer to tell it what message it should send to what object when it fires, and whether it should repeat.With some methods, you may also provide a user info dictionary.For example, you could create an NSTimer object that sends a message to a window, telling it to update itself after a certain time interval.” Apple Firstly I’d like to draw your attention to the Cocoa/CF documentation (which is always a great first port of call).The Apple docs have a section at the top of each reference article called “Companion Guides”, which lists guides for the topic being documented (if any exist).This post includes 2 ways applied by my team to deal with that issue.