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One of the value of my program might be change while other function is processing, Once the value has changed, the program should launch a particular function.
How do I let my program know the value has changed when the program is running? Pls help!
Looks like Key-Value Observation is what you want. This will allow you to observe the value of a property, and be notified when it changes.
Documentation + guide can be found here:
http://developer.apple.com/library/ios/#documentation/cocoa/conceptual/KeyValueObserving/KeyValueObserving.html#//apple_ref/doc/uid/10000177-BCICJDHA