Hey guys, check this out. I have a functi开发者_如何学编程on that treats for me a string. No matter what it does, i just want to knwo if is possible to this function return the result for the place that it was executed. I mean, check this:

[self priceFormat:@"1"];
priceLabel.text = price;


-(void) priceFormat:(NSString*)price {

price = @"2";

}

I just want to my function treats the string and return it to the same place that it was executed.

Thanks!

Three ways to do this

Way one, using a pointer

- (void)priceFormat:(NSString **)price {
  *price = @"2";
}

Wat two, using an instance variable

What you might want instead is an ivar. In the interface (most often the h file) of your class:

NSString *price;

and in the implementation (the m or mm file):

- (void)priceFormat:(NSString *)price {
  price = @"2";
}

I have created an example of this here.

If you want the price to be available to other objects as well (not just self), you might want to create a property for it and synthesize it. Then use self.price = @"2"; instead. More on this here: http://MacDeveloperTips.com/objective-c/objective-c-properties-setters-and-dot-syntax.html

Just make sure you make it a copy property (NSString in use)!

Way three using return

Note, that you can also return directly from a method:

- (NSString *)priceFormat:(NSString *)price {
  return @"2";
}

priceLabel.text = [self priceFormat:@"1"];