i have a void, like -(void) doSomething in a specific controller. i can call it in this controller via [self doSomething], but i don t know how to call this void from another .m file.
I want to call it in a -(IBAction) action:(id)sender
I ve tried using performSelector, but i got a unreconiezd selector send in the log. I ve no idea if i have to use the notification center, or delegate...
Thanks, ronan.
You have to have an instance of the first controller (the one where you declare the function in) in your second controller.
FirstViewController *firstController = [[FirstViewController alloc] init];
[firstController doSomething];
If your first controller is declared somewhere else, and you want your second controller to know about it, have a property of FirstViewController type in your second controller, and initialize it when you need it with your FirstViewController instance.
Sometimes, this can be quite complicated to do if you have multiple controller instances and you want every one of them to know about all the others, so I would rather suggest rewriting your method to a class method:
+ (void) doSomething;
so you could call it from anywhere with
[FirstViewController doSomething];
if you have the object you want to call it on and the method is public, then you just:
[object doSomething];
The problem is that you have two controllers who don t know about each other s existence. The notification center certainly is the way to deal with this situation: the advantage is that you need not establish a formal connection between the two.
The delegate method is another possibility, but then you have to either establish the connection via an IBOutlet in Interface Builder, or you must have one controller create the other controller and pass itself as the delegate. This ties them together more closely, which may or may not be appropriate. If the only connection between the two controllers is the calling of one -(void) method, then I d go with NSNotification.
I ve got the problem when I tried to do asynchronous requests to server from background thread. I ve never got results of those requests. Simple example which shows the problem: @protocol ...
i have a void, like -(void) doSomething in a specific controller. i can call it in this controller via [self doSomething], but i don t know how to call this void from another .m file. I want to call ...
Is there any way to obfuscate Objective-C Code ? Thanks
Created a View based Project and added a contact to the AddressBook using ABAddressBookRef,ABRecordRef now i wanted to display the added contact ABPersonViewController is the method but how to use in ...
I m pretty new to the Objective-C world and I have a long history with .net/C# so naturally I m inclined to use my C# wits. Now here s the question: I feel really inclined to create some type of ...
I have a simple Core Data app which displays a list of entities in the main window. To create or add new entities, I use a second modal window with a separate managed object context so changes can be ...
I m trying to show a database information in a tableview and then the detailed information in a view my problem is as follow: I created a NSMutableArray: NSMutableArray *myArray = [[NSMutableArray ...
I am writing an iPhone application which requires the user to enter several values that may contain a decimal point (currency values, percentages etc.). The number of decimal places in the values ...