Passing parameters to a custom class on initialization

Question

I have a class Message with two attributes, name and message, and another class MessageController with two text fields, nameField and messageField. I want to make an instance of Message in MessageController, passing these two attributes as arguments.

Right now, I am doing this:

 Message *messageIns = [[Message alloc] init];
 messageIns.name = nameField;
 messageIns.message = MessageField;

How can I pass the values at the creation of an instance? I tried to redefine init in Message.m, but I don't know how do that.

-(id)init{
    if((self=[super init])){

    }
    return self;
}

Please help.

score 47 · Accepted Answer · answered May 21 '11 at 22:29

47

You have to create a custom initializer.

-(id)initWithName:(NSString *)name_ message:(NSString *)message_ 
{
     self = [super init];
     if (self) {
         self.name = name_;
         self.message = message_;
     }
     return self;
}

of course this assumes your parameters are of NSString type and that you have your properties set correctly ;)

answered May 21 '11 at 22:29

Giuliano Galea

982
7
10

1

Thank you very much . And how should i call the method ? Message *messageIns = [[Message alloc] initWithName:name,message]; ??sorry but i'm a nob in this domain . – user567 May 21 '11 at 22:35
13

call it like this: `Message *messageIns = [[Message alloc] initWithName:someNameString message:someMessageString]` – Giuliano Galea May 21 '11 at 22:44
2

also add `-(id)initWithName:(NSString *)name_ message:(NSString *)message_ ; ` in the Message.h – EarlySun Jan 09 '17 at 10:25
don't use self.thing inside the init. Use _thing – SeikoTheWiz Sep 04 '19 at 10:04

Passing parameters to a custom class on initialization

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