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Target is the object that the message is going to execute isn't it. For example, if it's self, that means that those parameters are for the timer object you just created. Please correct me if I'm wrong, I'm not trying to challenge your knowledge, just to learn as I go.
If you see my code before, I'm using NSDate for my timePicker. One favor, I'm not answering more quiz questions, I get your point.. I still need to learn more fundamentals.. I get it, just please contribute with the thread to find solutions or not.. (there are many Professional Forums).
If this were a "Professional Forum" I would just give you an answer. I want to know what you do and do not know, so I can help you learn it. So please don't take the questions as condescending, they will help us help you.
Think of objects as people, so to speak. Not only is the NSTimer an object, but so is your viewcontroller. So are the buttons. These objects know how to do things. These things they know how to do are methods. A message is an instruction for an object to do something.
cancelIt: is a method in your viewcontroller object, as are all the methods we have discussed. Then self would refer to the viewcontroller, not the timer. Self would refer to the timer if you had access to apples code that implemets the timer and you were modifiying that.
So a target is the object you are sending a message to. The message is the name of the method you want the object to execute.
[aTimer invalidate]; // tells the timer pointed to by aTimer to execute the invalidate method
When you press a button, a message is sent. The target and method are chosen when you make the connection in Interface Builder. In your case, the target is your viewcontroller, and the method is one of the start or cancel methods.
I asked the question becasue it is fundamental to what an NSTimer is/does.
An NSTimer sends a message to an object at regular intervals.
In your case, the NSTimer is telling your viewcontroller to execute the echoIt: every second. The important part is that your viewcontroller is an object, echoIt: is something your viewcontroller is doing (not the timer). You only have one viewcontroller, so anything it stores (for example seconds) will persit for any NSTimer you create.
Now look at the NSTimer documentation:
If you see my code before, I'm using NSDate for my timePicker. One favor, I'm not answering more quiz questions, I get your point.. I still need to learn more fundamentals.. I get it, just please contribute with the thread to find solutions or not.. (there are many Professional Forums).
If this were a "Professional Forum" I would just give you an answer. I want to know what you do and do not know, so I can help you learn it. So please don't take the questions as condescending, they will help us help you.
Think of objects as people, so to speak. Not only is the NSTimer an object, but so is your viewcontroller. So are the buttons. These objects know how to do things. These things they know how to do are methods. A message is an instruction for an object to do something.
cancelIt: is a method in your viewcontroller object, as are all the methods we have discussed. Then self would refer to the viewcontroller, not the timer. Self would refer to the timer if you had access to apples code that implemets the timer and you were modifiying that.
So a target is the object you are sending a message to. The message is the name of the method you want the object to execute.
[aTimer invalidate]; // tells the timer pointed to by aTimer to execute the invalidate method
When you press a button, a message is sent. The target and method are chosen when you make the connection in Interface Builder. In your case, the target is your viewcontroller, and the method is one of the start or cancel methods.
I asked the question becasue it is fundamental to what an NSTimer is/does.
An NSTimer sends a message to an object at regular intervals.
In your case, the NSTimer is telling your viewcontroller to execute the echoIt: every second. The important part is that your viewcontroller is an object, echoIt: is something your viewcontroller is doing (not the timer). You only have one viewcontroller, so anything it stores (for example seconds) will persit for any NSTimer you create.
Now look at the NSTimer documentation: