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iPhone - How should I write an init method ?

Answer 1

+2 A:

If you need custom initialization inside CustomButton, use this:

- (id)initWithCoder:(NSCoder *)decoder {
    if (self = [super initWithCoder:decoder]) {
        /* do initialization here */
    }
return self;
}

This will not be called if you instantiate the button directly in code, only when instantiated bu the nib loader. Instantiating through code means you need to use initWithFrame so override that one. You may actually want to have initWithCoder and initWithFrame call the same initAlways method or something.

Also, it's important to know the Objective-C concept of "designated initializer" (look it up in objective C docs) because it can be a little confusing to people used to other OO languages.

Nimrod 2010-10-15 16:18:16

PLEASE provide the way you instantiate the object using this init method. the init method requires an NSCoder, 1- what is this nscorer? 2- How do i create it? 3- Do i call this method directly?

aryaxt 2010-10-15 16:52:46

You don't instantiate it yourself. The nib file is basically a serialized set of objects loaded by the nib loader, so the nib loader handles all the NSCoder stuff for you. You just have to make sure to do that [super ...] call in there. Basically overriding initWithCoder like this just inserts your code into the object instantiation that the nib loader does. Hope that makes sense....

Nimrod 2010-10-15 16:58:17

Actually, you probably want to use awakeFromNib: instead. I forgot about that, duh. see http://stackoverflow.com/questions/2663333/what-method-of-uiview-gets-called-when-instantiated-from-a-nib

Nimrod 2010-10-15 19:13:12

this doesn't work, initWithCoder never gets called

aryaxt 2010-10-16 15:10:40

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iPhone - How should I write an init method ?

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