Question

Here is an example constructor in Java:

public Board(int row, int column)
{
    this.row = row;
    this.column = column;
}

...

int row;
int column;

and here is my method in Objective C I am trying to do the same thing:

- (void) setSquares: (int) row:(int) column
{
    self.row = row; // <-- Error
    self.column = column;// <-- Error
}

...

int row;
int column;

As you can see I get 2 errors because the compiler thinks I am trying to access 2 properties, one called row and one called column. I know this is how you are suppose to access properties but how are you suppose to ‘change the scope’ so that I can set the local variables to the parameters of the method? How do I do this in Objective C?

Answer 1

That Java constructor would generally be translated like this:

@interface Board : NSObject

@property (nonatomic, assign) int row;
@property (nonatomic, assign) int column;

@end

@implementation Board

- (id)initWithRow:(int)row andColumn:(int)column {
    if (self = [super init]) {
        self.row = row;
        self.column = column;
    }
    return self;
}

@end