How to make a method call a method that contains more than one parameter?

Hi James,

From your answer, I guess you want me to conform the ‘methods’ in my .h and .m files, to the ‘method call’ in my main file, which is:

[ball setCenter: 34 radius: 25];

.

Now, if I do that, I will have to remove all of the 'NSArray' types, and replace them with 'int' types (or 'float' types since 'int type variables' can be 'float' types as well...but I'll do 'int' to make the 'parameter types' mixed), I’m going to do that now. First the .h file:

#import <Foundation/Foundation.h>

@interface Sphere : NSObject
{
    float _radius;
    int _center;
}

/*
-(void)setCenter:(NSArray *)center; */ // setter for center -- replaced by method with more than one parameter
-(int)center; //getter for center

/*
-(void)setRadius:(float)radius; */ // setter for radius -- replaced by method with more than one parameter
-(float)radius; //getter for radius


-(void)setCenter:(int)center radius:(float)radius;


@end

.

Now here’s the .m file:

#import "Sphere.h"

@implementation Sphere

/*
-(void)setCenter:(NSArray *)center
{
    _center = center;

} */ // setter for center -- replaced by method with more than one parameter

-(int)center
{
    return _center;

} //getter for center

/*
-(void)setRadius:(float)radius
{
    _radius = radius;

} */ // setter for radius -- replaced by method with more than one parameter

-(float)radius
{
    return _radius;

} //getter for radius

-(void)setCenter:(int)center radius:(float)radius;
{
    _center = center;
    _radius = radius;
}

@end

.

And lastly, the main file with NSLog printing out the center 'int':

#import <Cocoa/Cocoa.h>
#import "Sphere.h"

int main()
{
    Sphere *ball = [ [ Sphere alloc ] init ];

    [ball setCenter: 34 radius: 25];

    NSLog( @"The radius of ball is %f", [ball radius] );

    NSLog( @"The center of ball is %d", [ball center] );

    return 0;
}

.

The code compiles successfully with no errors and generates an output of:

2014-06-28 14:00:28.529 MyFirstObjectiveCProgram[13219:303] The radius of ball is 25.000000
2014-06-28 14:00:28.544 MyFirstObjectiveCProgram[13219:303] The center of ball is 34

.

Great! Now I know how making a call to a 'method' with multiple parameter’s works, and I also know that I can make a 'method call' to a 'method' containing mixed parameter types. However, I did not want to conform the methods to the 'method call' (I want just the opposite, which is to conform my 'method call' to the 'method'). I want to know how to make a call to the following 'method' as it is shown here:

-(void)setCenter:(NSArray *)center radius:(float)radius;

.

The reason why I want to know how to make a call to this particular 'method' shown above is because the video used it as one of its examples. The video used it as in example of how to chain two parameters to one 'method' instead of making two individual 'methods' each with one parameter. From the video, I got the impression that the 'method' containing the 'NSArray' parameter type will work once the code compiles and runs. However, I realized that it does not work with the 'method call' in the main file, which is:

[ball setRadius:25];

.

The 'method' containing the 'NSArray' parameter type will not work with the above ‘method call’ because the ‘method call’ is not calling that 'method’s' name, which is, ‘setCenter radius’, but to the 'method' named, ‘setRadius.’ The reason why the code compiles and runs in the video is because the ‘setRadius’ 'method' was not removed from the code…it stayed within the code, and it is as follows:

-(void)setRadius:(float)radius; // setter for radius that works with [ball setRadius:25]; method call

.

Once I commented out the ‘setRadius’ 'method' (shown above), its ‘method call’ did not work anymore. I commented out the ‘setRadius’ 'method' to really see how the ‘setCenter radius’ 'method' (which contains the 'NSArray' parameter type) works, and in order to get it to work properly, I need to know how to properly call to it. Thus, I experimented with various ‘method calls’, such as the one below that you suggested that I should conform the methods to…:

[ball setCenter: 34 radius: 25];

.

The only reason why I used the 34 ‘int’ (which also can be 34 'float') in the call above was just to experiment and figure out how to make the right 'method call'. But like you implied, the 'method’s' first parameter is of type ‘NSArray’, not of type ‘int’. Thus in order for the code to work, I either have to change the first parameter of the 'method' from ‘NSArray’ to ‘int’ (as you suggested, or even to 'float'), or I have to figure out the right 'method call' to this 'method', which contains a 'NSArray' and a 'float'.