I need help with functions in objective C?
In C++ i can make a function like this:
int testFunction(int zahl) {
int loop;
loop = zahl * 10;
return loop;
}
this function multiply my zahl with 10 and returns the result. In C++, i can call this function whenever i want with:
testFunction(5);
and it returns 50.
I dont understand how i can make such functions like testFunction in objective c? Have I to do this with
-(void)testFunction{}?
Thankx a lot for help!!
Greez Franhu
Just use
int testFunction(int zahl)
{
return zahl * 10;
}
You will only need the other notation (see user467105's answer) if you want to declare member functions.
In Objective-C, the function can be written like this:
-(int)testFunction:(int)zahl
{
int loop;
loop = zahl * 10;
return loop;
}
and called like this:
int testResult = [self testFunction:5];
//assuming testFunction is in same class as current (ie. self)
However, at least in Cocoa I believe, you can have C++ and Objective-C code side-by-side so you could include the C++ version as-is and call it from Objective-C code.
The function you have works exactly the same in Objective-C:
int testFunction(int zahl) {
int loop;
loop = zahl * 10;
return loop;
}
The other syntax you had:
-(void)testFunction{}?
Is for a method, in your .h file you need:
@interface SomeClass : NSObject {
}
-(int)testFunction:(int)zahl;
@end
In your .m:
-(int)testFunction:(int)zahl {
int loop;
loop = zahl * 10;
return loop;
}
Then you can call it [someObjectOfTypeSomeClass testFunction:13]
Methods apply to your objects. Use methods to change or query state of objects. Use functions to do other stuff. (this is the same as C++ methods and functions)
