CODEWITHSUNDEEP
iosobjective-c
Edu
Edu

Reputation: 25

call method from the same class that looks like

call method from the same class that looks like

-(void)functionA:(TemplateController *)sender    ??
  1. It is already defined in the .h.
  2. Usually I would do something like [self functionA]; but I am getting an error of instance method not found.

Upvotes: 0

Views: 65

Answers (4)

Joemon Johny
Joemon Johny

Reputation: 56

In your method -(void)functionA:(TemplateController *)sender, sender is a parameter to the method.So when you call functionA method you should specify the parameter even though parameter is nil, ie [self functionA:nil]. If you don't need any parameter to be passed you should change your method as -(void)functionA, then you can call it as [self functionA].

Upvotes: 0

neeraj
neeraj

Reputation: 1221

I think you need to read about function syntax in objective-c

- (type_r) abc:(type1)x cde:(type2)y def:(type3)z

is an instance method (using it requires creation of an object) whose name is abc:cde:def:, which returns something of type type_r, receives three arguments x, y and z, of types type1, type2 and type 3 respectively.

To call it, you say
class_name obj = [[class_name alloc] init];
[obj abc:x1 cde:y1 def:z1];

It is like doing this in c++:
class_name obj = new class_name();
obj.func_name(x1, y1, z1);

If there was a '+' instead of '-' at the beginning, this would mean it is a class method and it is supposed to be called using just the class name
[class_name abc:x1 cde:y1 def:z1];

Secondly, functions are not 'implemented' in header files. They are just 'declared' as a directive to the compiler that don't worry, you will find the implementation of this function at the linking time.

Upvotes: 0

Jitendra
Jitendra

Reputation: 5081

Your method has an Parameter.

-(void)functionA:(TemplateController *)sender

Paramter is TemplateController so without passing this parameter. this method not being called.

you are not passing the parameter so it gives an error.

[self FunctionA];

This is wrong way.

So pass the parameter Like this

[self functionA:templateControllerObject];

Upvotes: 0

Anoop Vaidya
Anoop Vaidya

Reputation: 46543

-(void)functionA:(TemplateController *)sender

Is a method named functionA:, which expects a parameter of type TemplateController

While you are not passing any parameter to it [self functionA].

It should be something like this

[self functionA:templateControllerObject]

Upvotes: 2

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